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AIMS Energy

2018, Volume 6, Issue 2: 291-338. doi: 10.3934/energy.2018.2.291
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Review

Solid state transformer technologies and applications: A bibliographical survey

  • Universitat Politecnica de Catalunya, Barcelona, Spain
  • Received: 22 January 2018 Accepted: 04 April 2018 Published: 20 April 2018

  • This paper presents a bibliographical survey of the work carried out to date on the solid state transformer (SST). The paper provides a list of references that cover most work related to this device and a short discussion about several aspects. The sections of the paper are respectively dedicated to summarize configurations and control strategies for each SST stage, the work carried out for optimizing the design of high-frequency transformers that could adequately work in the isolation stage of a SST, the efficiency of this device, the various modelling approaches and simulation tools used to analyze the performance of a SST (working a component of a microgrid, a distribution system or just in a standalone scenario), and the potential applications that this device is offering as a component of a power grid, a smart house, or a traction system.

    Citation: M. Ebrahim Adabi, Juan A. Martinez-Velasco. Solid state transformer technologies and applications: A bibliographical survey[J]. AIMS Energy, 2018, 6(2): 291-338. doi: 10.3934/energy.2018.2.291

    Related Papers:

  • This paper presents a bibliographical survey of the work carried out to date on the solid state transformer (SST). The paper provides a list of references that cover most work related to this device and a short discussion about several aspects. The sections of the paper are respectively dedicated to summarize configurations and control strategies for each SST stage, the work carried out for optimizing the design of high-frequency transformers that could adequately work in the isolation stage of a SST, the efficiency of this device, the various modelling approaches and simulation tools used to analyze the performance of a SST (working a component of a microgrid, a distribution system or just in a standalone scenario), and the potential applications that this device is offering as a component of a power grid, a smart house, or a traction system.


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    [1] Liu G, Polis MP, Wang B (1992) Solid-state power transformer circuit. Patent No.: 5119285.
    [2] Sudhoff SD (1999) Solid state transformer. Patent No.: 5943229.
    [3] Lai JS, Mansoor A, Maltra A, et al. (2005) Multifunction hybrid intelligent universal transformer. Patent No.: US 6954366 B2.
    [4] Lai JS, Mansoor A, Maltra A, et al. (2006) Multilevel converter based intelligent universal transformer. Patent No.: US 7050311 B2.
    [5] Gupta RK, Mohapatra KK, Castelino G, et al. (2011) Soft switching power electronic transformer. Patent No.: US 2011/0007534 A1.
    [6] She X, Huang AQ, Burgos R (2013) Review of solid-state transformer technologies and their application in power distribution systems. IEEE J Em Sel Top P 1: 186–198. doi: 10.1109/JESTPE.2013.2277917
    [7] Huber JE, Kolar JW (2016) Solid-state transformers: On the origins and evolution of key concepts. IEEE Ind Electron Mag 10: 19–28. doi: 10.1109/MIE.2016.2588878
    [8] Huang AQ (2016) Medium-voltage solid-state transformer. IEEE Ind Electron Mag 10: 29–42. doi: 10.1109/MIE.2016.2589061
    [9] Ronanki D, Williamson S (2018) Evolution of power converter topologies and technical considerations of power electronic transformer-based rolling stock architectures. IEEE T on Transport Electri 4: 211–219. doi: 10.1109/TTE.2017.2765518
    [10] Pena-Alzola R, Gohil G, Mathe L, et al. (2013) Review of modular power converters solutions for smart transformer in distribution system. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 380–387.
    [11] Rathod DK (2014) Solid state transformer (SST) review of recent developments. Adv Electron Electr Eng 4: 45–50.
    [12] Gajowik T, Rafał K, Malinowski M (2017) Review of multilevel converters for application in solid state transformers. Przegląd Elektrotechniczny 93: 1–5.
    [13] Falcones S, Mao X, Ayyanar R (2010) Topology comparison for solid state transformer implementation. IEEE Power and Energy Society General Meeting. IEEE, 1–8.
    [14] Shri A (2013) A solid-state transformer for interconnection between the medium and the low voltage grid. Master Thesis, Delft University.
    [15] Harada K, Yamasaki F, Jinno K (1996) Intelligent transformer. In: 27th Annual IEEE Power Electronics Specialists Conference (PESC). Baveno, Italy, 1337–1341.
    [16] Kang M, Enjeti PN, Pitel IJ (1999) A simplified auto-connected electronic transformer (SACET) approach upgrades standard 6-pulse rectifier equipment with 12-pulse characteristics to facilitate harmonic compliance. IEEE Power Electronics Specialists Conference (PESC). IEEE, 199–204.
    [17] Kang M, Woo BO, Enjeti PN, et al. (1999) Open-delta auto-connected electronic transformer (OD-ACET) based multi-pulse rectifier systems. Applied Power Electronics Conference and Exposition (APEC). IEEE, 234–240.
    [18] Kang M, Woo BO, Enjeti P, et al. (1999) Autoconnected-electronic-transformer-based multipulse rectifiers for utility interface of power electronic systems. IEEE T Ind Appl 35: 646–656. doi: 10.1109/28.767016
    [19] Kang M, Enjeti PN, Pitel IJ (1999) Analysis and design of electronic transformers for electric power distribution system. IEEE T Power Electr 14: 1133–1141. doi: 10.1109/63.803407
    [20] Visser AJ, Enslin JHR, Mouton HDT (2002) Transformerless series sag compensation with a cascaded multilevel inverter. IEEE T Ind Electron 49: 824–831. doi: 10.1109/TIE.2002.801067
    [21] Tolbert LM, Peterson WA, White CP, et al. (2002) A bi-directional DC-DC converter with minimum energy storage elements. Industry Applications Conference. IEEE, 1572–1577.
    [22] EPRI (2006) EPRI intelligent universal transformer:risk appraisal and project plans. EPRI Report 1012434.
    [23] Aijuan J, Hangtian L, Shaolong L (2006) A new high-frequency AC link three-phase four-wire power electronic transformer. 1st IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 1–6.
    [24] Haibo L, Chengxiong M, Jiming L, et al. (2008) Parallel operation of electronic power transformer and conventional transformer. 3rd International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 1802–1808.
    [25] Falcones S, Ayyanar R, Mao X (2012) A DC–DC multiport-converter-based solid-state transformer integrating distributed generation and storage. IEEE T Power Electr 28: 2192–2203.
    [26] Ling C, Ge B, Bi D, et al. (2011) An effective power electronic transformer applied to distribution system. International Conference on Electrical Machines and Systems (ICEMS). IEEE, 1–6.
    [27] Wang G, Baek S, Elliott J, et al. (2011) Design and hardware implementation of Gen-1 silicon based solid state transformer. 26th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1344–1349.
    [28] She X, Huang AQ, Wang G (2011) 3-D space modulation with voltage balancing capability for a cascaded seven-level converter in a solid-state transformer. IEEE T Power Electr 26: 3778–3789. doi: 10.1109/TPEL.2011.2142422
    [29] Liu X, Liu L, Li H, et al. (2012) Study on the start-up schemes for the three-stage solid state transformer applications. IEEE Energy Conversion Congress and Exposition, (ECCE). IEEE, 3528–3532.
    [30] Kadavelugu A, Wang G, Bhattacharya S, et al. (2012) Auxiliary power supply for solid state transformers. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1426–1432.
    [31] Tripathi AK, Mainali K, Patel D, et al. (2013) Closed loop D-Q control of high-voltage high-power three-phase dual active bridge converter in presence of real transformer parasitic parameters. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 5488–5495.
    [32] Nan C, Ayyanar R (2013) Dual active bridge converter with PWM control for solid state transformer application. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4747–4753.
    [33] Madhusoodhanan S, Patel D, Bhattacharya S, et al. (2013) Protection of a transformerless intelligent power substation. 4th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 1–8.
    [34] Toit D, Mouton HDT, Kennel R, et al. (2013) Predictive control of series stacked flying-capacitor active rectifiers. IEEE T Ind Inform 9: 697–707. doi: 10.1109/TII.2012.2224875
    [35] Madhusoodhanan S, Tripathi A, Kadavelugu A, et al. (2014) Experimental validation of the steady state and transient behavior of a transformerless intelligent power substation. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 3477–3484.
    [36] Roy S, De A, Bhattacharya S (2014) Current source inverter based cascaded solid state transformer for AC to DC power conversion. International Power Electronics Conference (IPEC). IEEE, 651–655.
    [37] Yang T, Meere R, Feely O, et al. (2014) Performance of 3-phase 4-wire solid state transformer under imbalanced loads. IEEE PES T&D Conference and Exposition. IEEE, 1–5.
    [38] Yu X, She X, Huang A, et al. (2014) distributed power balance strategy for DC/DC converters in solid state transformer. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 989–994.
    [39] Sidorov AV, Zinoviev GS (2015) power electronic transformer based on AC voltage regulator. 16th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM). IEEE, 477–481.
    [40] Ouyang S, Liu J, Wang X, et al. (2015) Comparison of four power electronic transformer topologies on unbalanced load correction capacity. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3702–3709.
    [41] Roasto I, Miñambres-Marcos V, Romero-Cadaval E, et al. (2015) Design and evaluation of a base module of active power electronic transformer. 9th International Conference on Compatibility and Power Electronics (CPE). IEEE, 384–389.
    [42] Zong S, Zhu Q, Yu W, et al. (2015) Auxiliary power supply for solid state transformer with ultra high voltage capacitive driving. IEEE Applied Power Electronics Conference and Exposition-APEC. IEEE, 1008–1013.
    [43] Reddy BD, Sahoo SK (2015) Testing of solid state transformer. Int J Nov Res Electr Mech Eng 2: 1–7.
    [44] Ramos-Ruiz J, Krishnamoorthy H, Enjeti P (2015) Adding capacity to an existing electric power distribution network using a solid state transformer system. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 6059–6066.
    [45] Hambridge S, Huang AQ, Yu R (2015) Solid state transformer (SST) as an energy router: Economic dispatch based energy routing strategy. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2355–2360.
    [46] Mainali K, Madhusoodhanan S, Tripathi A, et al. (2015) Start-up scheme for solid state transformers connected to medium voltage grids. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1014–1021.
    [47] Cazakevicius FE, Quevedo JO, Beltrame RC, et al. (2015) High insulation voltage gate-driver applied to a solid state transformer. 13th IEEE Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC). IEEE, 1–6.
    [48] Zhu Q, Wang L, Zhang L, et al. (2016) Improved medium voltage AC-DC rectifier based on 10k kV SiC MOSFET for solid state transformer (SST) application. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2365–2369.
    [49] Yang T, Meere R, O'Loughlin C, et al. (2016) Performance of solid state transformers under imbalanced loads in distribution systems. In: IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2629–2636.
    [50] Kadavelugu A, Wang G, Bhattacharya S, et al. (2016) Auxiliary power supply for Solid State Transformers. IEEE International Conference on Electronics, Circuits and Systems (ICECS). IEEE, 193–196.
    [51] Ronan ER, Sudhoff SD, Glover SF, et al. (2000) Application of power electronics to the distribution transformer. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 861–867.
    [52] Ronan ER, Sudhoff SD, Glover SF, et al. (2002) A power electronic-based distribution transformer. IEEE T Power Deliver 17: 537–543. doi: 10.1109/61.997934
    [53] EPRI (2004) Feasibility study for the development of high-voltage, low-current power semiconductor devices. EPRI Report 1001698.
    [54] EPRI (2004) Development of a new multilevel converter-based intelligent universal transformer : design analysis. EPRI Report 1002159.
    [55] EPRI (2005) Bench model development of a new multilevel converter-based intelligent universal transformer. EPRI Report 1010549.
    [56] Lai JS, Maitra A, Goodman F (2006) Performance of a distribution intelligent universal transformer under source and load disturbances. Industry Applications Conference. IEEE, 719–725.
    [57] Jin AJ, Li HT, Li SL (2006) A new matrix type three-phase four-wire power electronic transformer. IEEE Annual Power Electronics Specialists Conference (PESC). IEEE, 1–6.
    [58] EPRI (2008) 100-kVA intelligent universal transformer development. EPRI Report 1016034.
    [59] Iman-Eini H, Farhangi S, Schanen JL, et al. (2009) A modular power electronic transformer based on a cascaded H-bridge multilevel converter. Electr Power Syst Res 79: 1625–1637. doi: 10.1016/j.epsr.2009.06.010
    [60] Sabahi M, Hosseini SH, Sharifian MB, et al. (2010) Bi-directional power electronic transformer with maximum power-point tracking capability for induction heating applications. IET Power Electron 3: 724–731. doi: 10.1049/iet-pel.2008.0106
    [61] Yu Du SB, Wang G, Bhattacharya S (2010) Design considerations of high voltage and high frequency three phase transformer for Solid State Transformer application. Energy Conversion Congress and Exposition (ECCE). IEEE, 1551–1558.
    [62] Wang F, Huang A, Wang G, et al. (2012) Feed-forward control of solid state transformer. 27th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1153–1158.
    [63] Wang F, Lu X, Wang W, et al. (2012) Development of distributed grid intelligence platform for solid state transformer. 3rd IEEE International Conference on Smart Grid Communications (SmartGridComm). IEEE, 481–485.
    [64] Huang A, She X, Yu X, et al. (2013) Next generation power distribution system architecture: the future renewable electric energy delivery and management (freedm) system. The Third International Conference on Smart Grids, Green Communications and IT Energy-aware Technologies.
    [65] She X, Huang AQ, Ni X (2013) A cost effective power sharing strategy for a cascaded multilevel converter based Solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 372–379.
    [66] Yu X, She X, Huang A (2013) Hierarchical power management for DC microgrid in islanding mode and Solid State transformer enabled mode. 39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 1656–1661.
    [67] Yu X, She X, Ni X, et al. (2013) Power management strategy for DC microgrid interfaced to distribution system based on solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 5131–5136.
    [68] Zhao T, Wang G, Bhattacharya S, et al. (2013) Voltage and power balance control for a cascaded h-bridge converter-based solid-state Transformer. IEEE T Power Electr 28: 1523–1532. doi: 10.1109/TPEL.2012.2216549
    [69] She X, Huang AQ, Wang F, et al. (2013) Wind energy system with integrated functions of active power transfer , reactive power compensation , and voltage conversion. IEEE T Ind Electron 60: 4512–4524. doi: 10.1109/TIE.2012.2216245
    [70] Yu X, She X, Ni X, et al. (2014) System integration and hierarchical power management strategy for a solid-state transformer interfaced microgrid system. IEEE T Power Electr 29: 4414–4425. doi: 10.1109/TPEL.2013.2289374
    [71] She X, Yu X, Wang F, et al. (2014) Design and demonstration of a 3.6-kV-120-V/10-kVA solid-state transformer for smart grid application. IEEE T Power Electr 29: 3982–3996.
    [72] Dujic D, Mester A, Chaudhuri T, et al. (2011) Laboratory scale prototype of a power electronic transformer for traction applications. 14th European Conference on Power Electronics and Applications (EPE). IEEE, 1–10.
    [73] Besselmann T, Mester A, Dujic D (2014) Power electronic traction transformer: Efficiency improvements under light-load conditions. IEEE T Power Electr 29: 3971–3981. doi: 10.1109/TPEL.2013.2293402
    [74] Liu X, Li H, Wang Z (2012) A start-up scheme for a three-stage solid-state transformer with minimized transformer current response. IEEE T Power Electr 27: 4832–4836. doi: 10.1109/TPEL.2012.2200047
    [75] Li Z, Wang P, Chu Z, et al. (2013) A three-phase 10 kVAC-750 VDC power electronic transformer for smart distribution grid. 15th European Conference on Power Electronics and Applications (EPE). IEEE, 1–9.
    [76] Han BM, Choi NS, Lee JY (2014) New bidirectional intelligent semiconductor transformer for smart grid application. IEEE T Power Electr 29: 4058–4066. doi: 10.1109/TPEL.2013.2284009
    [77] Lee JY, Yoon YD, Han BM (2014) New intelligent semiconductor transformer with bidirectional power-flow capability. IEEE T Power Deliver 29: 299–301. doi: 10.1109/TPWRD.2013.2288025
    [78] Wang F, Wang G, Huang A, et al. (2014) Design and operation of a 3.6 kV high performance solid state transformer based on 13kV SiC MOSFET and JBS diode. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4553–4560.
    [79] Wang F, Wang G, Huang A, et al. (2014) Standalone operation of a single phase medium voltage solid state transformer in distribution grid. 40th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 5221–5226.
    [80] Tan K, Yu R, Guo S, et al. (2014) Optimal design methodology of bidirectional LLC resonant DC/DC converter for solid state transformer application. 40th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 1657–1664.
    [81] Wang F, Wang G, Huang A, et al. (2014) Rectifier stage operation and controller design for a medium voltage solid state transformer with LCL filter. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3642–3649.
    [82] Wang F, Wang G, Huang A, et al. (2014) A 3.6kV high performance solid state transformer based on 13kV SiC MOSFET. 5th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 1–8.
    [83] Oliveira SVG, Castellani DG, De Novaes Y, et al. (2014) AC-AC modular multilevel converter applied to solid-state transformers. 40th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 1174–1180.
    [84] Morawiec M, Lewicki A, Krzemiński Z (2015) Power electronic transformer for smart grid application. First Workshop on Smart Grid and Renewable Energy (SGRE). IEEE, 1–6.
    [85] Yun HJ, Kim HS, Ryu MH, et al. (2015) A simple and practical voltage balance method for a solid-state transformer using cascaded H-bridge converters. 9th International Conference on Power Electronics (ICPE). IEEE, 2415–2420.
    [86] Zhao B, Song Q, Liu W (2015) A practical solution of high-frequency-link bidirectional solid-state transformer based on advanced components in hybrid microgrid. IEEE T Ind Electron 62: 4587–4597. doi: 10.1109/TIE.2014.2350459
    [87] Madhusoodhanan S, Tripathi A, Patel D, et al. (2015) Solid-state transformer and MV grid Tie applications enabled by 15 kV SiC IGBTs and 10 kV SiC MOSFETs based multilevel converters. IEEE T Ind Appl 51: 3343–3360.
    [88] Ge J, Zhao Z, Yuan L, et al. (2015) Energy feed-forward and direct feed-forward control for solid-state transformer. IEEE T Power Electr 30: 4042–4047. doi: 10.1109/TPEL.2014.2382613
    [89] Chen H, Prasai A, Moghe R, et al. (2016) A 50-kVA three-phase solid-state transformer based on the minimal topology: Dyna-C. IEEE T Power Electr 31: 8126–8137.
    [90] Chen H, Prasai A, Divan D (2017) Dyna-C: A minimal topology for bidirectional solid-state transformers. IEEE T Power Electr 32: 995–1005. doi: 10.1109/TPEL.2016.2547983
    [91] Garcia P, Saeed S, Navarro-Rodriguez A, et al. (2016) Switching frequency optimization for a solid state transformer with energy storage capabilities. IEEE Energy Conversion Congress and Exposition, Proceedings (ECCE ). IEEE, 1–8.
    [92] Wang Z, Castellazzi A (2016) Impact of SiC technology in a three-port active bridge converter for energy storage integrated solid state transformer applications. 4th IEEE Workshop on Wide Bandgap Power Devices and Applications (WiPDA). IEEE, 84–89.
    [93] Liu Y, Liu Y, Abu-Rub H, et al. (2016) Model predictive control of matrix converter based solid state transformer. IEEE International Conference on Industrial Technology (ICIT). IEEE, 1248–1253.
    [94] Liu Y, Liu Y, Ge B, et al. (2017) Interactive grid interfacing system by matrix-converter based solid state transformer with model predictive control. IEEE T Ind Informatics.
    [95] Nila-Olmedo N, Mendoza-Mondragon F, Espinosa-Calderon A, et al. (2016) ARM + FPGA platform to manage solid-state-smart transformer in smart grid application. International Conference on ReConFigurable Computing and FPGAs. IEEE, 1–6.
    [96] Chen H, Divan D (2016) Soft-switching solid state transformer (S4T). IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1–10.
    [97] Zhang J, Wang Z, Shao S (2017) A three-phase modular multilevel DC–DC converter for power electronic transformer applications. IEEE J Em Sel Top Pn 5: 140–150. doi: 10.1109/JESTPE.2016.2609936
    [98] Gao R, She X, Husain I, et al. (2017) Solid-state transformer interfaced permanent magnet wind turbine distributed generation system with power management functions. IEEE T Ind Appl 53: 3849–3861. doi: 10.1109/TIA.2017.2679679
    [99] Aggeler D, Biela J, Kolar JW (2008) Solid-state transformer based on SiC JFETs for future energy distribution systems. ETH Power Electronic Systems Laboratory. IEEE.
    [100] Merwe JWD, Mouton HDT (2009) The solid-state transformer concept: A new era in power distribution. IEEE Africon Conference. IEEE, 1–6.
    [101] Merwe WVD, Mouton T (2009) Solid-state transformer topology selection. IEEE International Conference on Industrial Technology. IEEE, 1–6.
    [102] Stefanski K, Qin H, Chowdhury BH, et al. (2010) Identifying techniques, topologies and features for maximizing the efficiency of a distribution grid with solid state power devices. North American Power Symposium (NAPS). IEEE, 1–7.
    [103] Sabahi M, Goharrizi AY, Hosseini SH, et al. (2010) Flexible power electronic transformer. IEEE Trans Power Electron 25: 2159–2169. doi: 10.1109/TPEL.2010.2040840
    [104] Wang X, Liu J, Xu T, et al. (2012) Comparisons of different three-stage three-phase cascaded modular topologies for power electronic transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1420–1425.
    [105] Cheng L, Xie Y, Lu X, et al. (2012) The topology analysis and compare of high-frequency power electronic transformer. Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 1–6.
    [106] Shojaei A, Joos G (2013) A topology for three-stage solid state transformer. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [107] Shojaei A, Joos G (2013) A modular solid state transformer with a single-phase medium-frequency transformer. IEEE Electrical Power & Energy Conference (EPEC). IEEE, 1–5.
    [108] Qin H, Kimball JW (2013) Solid-state transformer architecture using AC-AC dual-active-bridge converter. IEEE T Ind Electron 60: 3720–3730. doi: 10.1109/TIE.2012.2204710
    [109] Shojaei A, Joos G (2013) A modular multilevel converter-based power electronic transformer. IEEE Energy Conversion Congress and Exposition, (ECCE). IEEE, 367–371.
    [110] Viktor B, Indrek R, Tõnu L (2011) Intelligent Transformer: Possibilities and Challenges. Sci J Riga Tech Univ Power Electr Eng 29: 95–100.
    [111] Martinez-Velasco JA, Alepuz S, Gonzalez-Molina F, et al. (2014) Dynamic average modeling of a bidirectional solid state transformer for feasibility studies and real-time implementation. Electr Power Syst Res 117: 143–153. doi: 10.1016/j.epsr.2014.08.005
    [112] Alepuz S, Gonzalez-Molina F, Martin-Arnedo J, et al. (2014) Development and testing of a bidirectional distribution electronic power transformer model. Electr Power Syst Res 107: 230–239. doi: 10.1016/j.epsr.2013.10.010
    [113] Hatua K, Dutta S, Tripathi A, et al. (2011) Transformer less intelligent power substation design with 15kV SiC IGBT for grid interconnection. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4225–4232.
    [114] Madhusoodhanan S, Tripathi A, Patel D, et al. (2014) Solid-state transformer and MV grid Tie applications enabled by 15 kV SiC IGBTs and 10 kV SiC MOSFETs based multilevel converters. International Power Electronics Conference (IPEC). IEEE, 1626–1633.
    [115] González-Molina F, Martin-Arnedo J, Alepuz S, et al. (2015) EMTP model of a bidirectional multilevel solid state transformer for distribution system studies. Power & Energy Society General Meeting. IEEE, 1–5.
    [116] Wang L, Zhang D, Wang Y, et al. (2016) Power and voltage balance control of a novel three-phase solid-state transformer using multilevel cascaded H-bridge inverters for microgrid applications. IEEE T Power Electr 31: 3289–3301. doi: 10.1109/TPEL.2015.2450756
    [117] Adabi ME, Martinez-Velasco JA, Alepuz S (2017) Modeling and simulation of a MMC-based solid-state transformer. Electr Eng, 1–13.
    [118] Yang L, Zhao T, Wang J, et al. (2007) Design and analysis of a 270 kW five-level DC/DC converter for solid state transformer using 10 kV SiC power devices. IEEE Power Electronics Specialists Conference (PESC). IEEE, 245–251.
    [119] Zhao T, Yang L, Wang J, et al. (2007) 270 kVA solid state transformer based on 10 kV SiC power devices. IEEE Electric Ship Technologies Symposium (ESTS ). IEEE, 145–149.
    [120] Abedini A, Lipo T (2010) A novel topology of solid state transformer. 1st Power Electronics and Drive Systems and Technologies Conference (PEDSTC). IEEE, 101–105.
    [121] Aijuan J, Hangtian L, Shaolong L (2005) A three-phase four-wire high-frequency AC link matrix converter for power electronic transformer. 8th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 1295–1300.
    [122] Merwe WVD, Mouton T (2009) Natural balancing of the two-cell back-to-back multilevel converter with specific application to the solid-state transformer concept. 4th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2955–2960.
    [123] Gupta RK, Mohapatra KK, Mohan N (2009) A novel three-phase switched multi-winding power electronic transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2696–2703.
    [124] Basu K, Gupta RK, Nath S, et al. (2010) Research in matrix-converter based three-phase power-electronic transformers. International Power Electronics Conference (IPEC). IEEE, 2799–2803.
    [125] Zhu H, Li Y, Wang P, et al. (2012) Design of power electronic transformer based on modular multilevel converter. Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 1–4.
    [126] Reddy SY, Bharat S (2012) A modular power electronic transformer for medium voltage application. 34th International Conference on Software Engineering (ICSE). IEEE, 1–6.
    [127] Xinyu W, Jinjun L, Taotao X, et al. (2012) Research of three-phase single-stage matrix converter for power electronic transformer. 7th International Power Electronics and Motion Control Conference (IPEMC). IEEE, 599–603.
    [128] Dannier A, Rizzo R (2012) An overview of power electronic transformer: control strategies and topologies. 21st International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 1552–1557.
    [129] Rajesh C, Kishor M, Chandra NP (2012) reduced switch topology of power electronic transformer. Int J Eng Res Appl 2: 2786–2792.
    [130] Hwang SH, Liu X, Kim JM, et al. (2013) Distributed digital control of modular-based solid-state transformer using DSP+FPGA. IEEE Trans Ind Electron 60: 670–680.
    [131] Kirsten AL, Oliveira THD, Roncalio JGP, et al. (2013) Performance analysis of modular converter for solid state transformers. Brazilian Power Electronics Conference. IEEE, 1060–1066.
    [132] Dutta S, Roy S, Bhattacharya S (2014) A mode switching, multiterminal converter topology with integrated fluctuating renewable energy source without energy storage. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 419–426.
    [133] Chen H, Prasai A, Divan D (2014) Stacked modular isolated dynamic current source converters for medium voltage applications. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2278–2285.
    [134] Hosseini SH, Sedaghati F, Sabahi M, et al. (2014) A new configuration of modular isolated bidirectional DC-DC converter. 27th Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 1–6.
    [135] Sepahvand H, Corzine SMK, Bhattacharya S, et al. (2014) Topology selection for medium-voltage three-phase SiC solid-state transformer. 3rd International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 485–489.
    [136] Kunov G (2014) Matlab-Simulink model of solid-state transformer realized with matrix converters. 18th International Symposium on Electrical Apparatus and Technologies (SIELA). IEEE, 1–4.
    [137] Yang T, O'Loughlin C, Meere R, et al. (2014) Investigation of modularity in DC-DC converters for solid state transformers. 5th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 1–8.
    [138] Roy S, De A, Bhattacharya S (2014) Multi-port solid state transformer for inter-grid power flow control. International Power Electronics Conference (IPEC). IEEE, 3286–3291.
    [139] Prasai A, Chen H, Divan D (2014) Dyna-C: A topology for a bi-directional solid-state transformer. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1219–1226.
    [140] Prasai A, Chen H, Moghe R, et al. (2014) Dyna-C: Experimental results for a 50 kVA 3-phase to 3-phase solid state transformer. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2271–2277.
    [141] Vasiladiotis M, Member S, Rufer A (2015) A modular multiport power electronic transformer with integrated split battery energy storage for versatile ultrafast EV charging stations. IEEE T Ind Electron 62: 3213–3222. doi: 10.1109/TIE.2014.2367237
    [142] Wang Z, Zhang J, Sheng K (2015) Modular multilevel power electronic transformer. 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia). IEEE, 315–321.
    [143] Wang Z, Wang T, Zhang J (2015) Three phase modular multilevel DC/DC converter for power electronic transformer application. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 6277–6284.
    [144] De A, Bhattacharya S (2015) Design, analysis and implementation of discontinuous mode Dyna-C AC/AC converter for solid state transformer applications. IEEE Energy Conversion Congress and Exposition (ECCE ). IEEE, 5030–5037.
    [145] Lopez M, Rodriguez A, Blanco E, et al. (2015) Design and implementation of the control of an MMC-based solid state transformer. 13th IEEE International Conference on Industrial Informatics (INDIN). IEEE, 1583–1590.
    [146] Huber JE, Kolar JW (2015) Analysis and design of fixed voltage transfer ratio DC/DC converter cells for phase-modular solid-state transformers. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 5021–5029.
    [147] Mamede HR, Dos Santos WM, Martins DC (2015) Interconnection of DAB converters for application in solid-state transformers with redundancy. 6th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG ). IEEE, 1–6.
    [148] Mario L, Briz F, Saeed M, et al. (2016) Comparative analysis of modular multiport power electronic transformer topologies. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1–8.
    [149] Briz F, López M, Rodríguez A, et al. (2016) Modular power electronic transformers:modular multilevel converter versus cascaded H-bridge solutions. IEEE Ind Electron Mag 10: 6–19.
    [150] Lin L, Lin Z, Haijun L (2016) Research on the topology and control strategy of bidirectional DC-DC converter used in the power electronic transformer. 12th IET International Conference on AC and DC Power Transmission (ACDC). IEEE, 1–6.
    [151] Wang X, Zhang G (2016) Research on power electronic transformer with bidirectional power flow. 8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia). IEEE, 1212–1216.
    [152] Liu Y, Liu Y, Abu-Rub H, et al. (2016) Model predictive control of matrix converter based solid state transformer. IEEE International Conference on Industrial Technology (ICIT). IEEE, 1248–1253.
    [153] Qingshan W, Liang D (2016) Research on loss reduction of dual active bridge converter over wide load range for solid state transformer application. 11th International Conference on Ecological Vehicles and Renewable Energies (EVER). IEEE, 1–9.
    [154] Al-Hafri A, Ali H, Ghias A, et al. (2016) Transformer-less based solid state transformer for intelligent power management. 5th International Conference on Electronic Devices, Systems and Applications (ICEDSA). IEEE, 1–4.
    [155] He L, Zhang J, Chen C, et al. (2017) A bidirectional bridge modular switched-capacitor-based Power electronics transformer. IEEE T Ind Electron 65: 718–726.
    [156] Costa LF, Buticchi G, Liserre M (2017) Quad-active-bridge dc-dc converter as cross-link for medium-voltage modular inverters. IEEE T Ind Appl 53: 1243–1253.
    [157] Zhao B, Song Q, Jianguo L, et al. (2017) A modular-multilevel-DC-link front-to-front DC solid state transformer based on high-frequency dual active phase-shift for HVDC grid integration. IEEE T Ind Electron 64: 8919–8927. doi: 10.1109/TIE.2016.2622667
    [158] Shri A, Popovic J, Ferreira JA, et al. (2013) Design and control of a three-phase four-leg inverter for solid-state transformer applications. 15th European Conference on Power Electronics and Applications (EPE). IEEE, 1–9.
    [159] Liu H, Mao C, Lu J, et al. (2009) Optimal regulator-based control of electronic power transformer for distribution systems. Electr Power Syst Res 79: 863–870. doi: 10.1016/j.epsr.2008.11.003
    [160] Basu K, Mohan N (2010) A power electronic transformer for PWM AC drive with lossless commutation and common-mode voltage suppression. Joint International Conference on Power Electronics, Drives and Energy Systems (PEDES) & Power India. IEEE, 1–6.
    [161] Basu K, Somani A, Mohapatra KK, et al. (2010) A three-phase AC/AC power electronic transformer-based PWM AC drive with lossless commutation of leakage energy. International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 1693–1699.
    [162] Nath S, Mohapatra KK, Basu K, et al. (2010) Source based commutation in matrix converter fed power electronic transformer for power systems application. International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 1682–1686.
    [163] Brando G, Dannier A, Del Pizzo A (2010) A simple predictive control technique of power electronic transformers with high dynamic features. 5th IET International Conference on Power Electronics, Machines and Drives (PEMD).
    [164] Mao X, Falcones S, Ayyanar R (2010) Energy-based control design for a solid state transformer. IEEE Power and Energy Society General Meeting. IEEE, 1–7.
    [165] Sadeghi M, Gholami M (2011) Advanced control methodology for intelligent universal transformers based on fuzzy logic controllers. 10th WSEAS International Conference on Communications, Electrical & Computer Engineering. IEEE, 58–62.
    [166] Açıkgöz H, Keçecioğlu ÖF, Gani A, et al. (2015) Optimal control and analysis of three phase electronic power transformers. Procedia Soc Behav Sci 195: 2412–2420. doi: 10.1016/j.sbspro.2015.06.240
    [167] Liu B, Zha Y, Zhang T, et al. (2016) Fuzzy logic control of dual active bridge in solid state transformer applications. Tsinghua University-IET Electrical Engineering Academic Forum. IEEE, 1–4.
    [168] Wang G, She X, Wang F, et al. (2011) Comparisons of different control strategies for 20kVA solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3173–3178.
    [169] Ortiz G, Bortis D, Kolar JW, et al. (2012) Soft-switching techniques for medium-voltage isolated bidirectional DC/DC converters in solid state transformers. 38th Annual Conference on IEEE Industrial Electronics Society (IECON). IEEE, 5233–5240.
    [170] Moonem MA, Krishnaswami H (2014) Control and configuration of three-level dual-active bridge DC-DC converter as a front-end interface for photovoltaic system. 29th IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 3017–3020.
    [171] Wang X, Liu J, Xu T, et al. (2013) Control of a three-stage three-phase cascaded modular power electronic transformer. 28th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1309–1315.
    [172] Cheng H, Gong Y, Gao Q (2015) The research of coordination control strategy in cascaded multilevel solid state transformer. IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 222–226.
    [173] Yu X, Ni X, Huang A (2014) Multiple objectives tertiary control strategy for solid state transformer interfaced DC microgrid. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4537–4544.
    [174] Yousefpoor N, Parkhideh B, Azidehak A, et al. (2014) Modular transformer converter-based convertible static transmission controller for transmission grid management. IEEE T Power Electr 29: 6293–6306. doi: 10.1109/TPEL.2014.2302014
    [175] Parks N, Dutta S, Ramachandram V, et al. (2012) Black start control of a solid state transformer for emergency power restoration. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 188–195.
    [176] Dutta S, Ramachandar V, Bhattacharya S (2014) Black start operation for the solid state transformer created micro-grid under islanding with storage. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3934–3941.
    [177] Cho Y, Han Y, Beddingfield RB, et al. (2016) Seamless black start and reconnection of LCL-filtered solid state transformer based on droop control. IEEE Energy Conversion Congress and Exposition (ECCE ). IEEE, 1–7.
    [178] She X, Huang AQ, Ni X (2014) Current sensorless power balance strategy for DC/DC converters in a cascaded multilevel converter based solid state transformer. IEEE T Power Electron 29: 17–22. doi: 10.1109/TPEL.2013.2256149
    [179] Zengin S, Boztepe M (2015) Trapezoid current modulated DCM AC/DC DAB converter for two-stage solid state transformer. 9th International Conference on Electrical and Electronics Engineering (ELECO). IEEE, 634–638.
    [180] Vargas T, Toebe A, Rech C (2015) Double network control architecture for a modular solid state transformer. 13th IEEE Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC ). IEEE, 1–6.
    [181] Liu B, Zha Y, Zhang T, et al. (2016) Sliding mode control for rectifier stage of solid state transformer. 14th International Workshop on Variable Structure Systems (VSS). IEEE, 286–289.
    [182] Liu B, Zha Y, Zhang T, et al. (2016) Predictive direct power control for rectifier stage of solid state transformer. 12th World Congress on Intelligent Control and Automation (WCICA). IEEE, 201–204.
    [183] Liu B, Zha Y, Zhang T (2017) D-Q frame predictive current control methods for inverter stage of solid state transformer. IET Power Electr 10: 687–696. doi: 10.1049/iet-pel.2016.0011
    [184] Jianfeng Z (2004) Simulation research on instantaneous control-based power electronics transformer. 4th International Power Electronics and Motion Control Conference (IPEMC), 1722–1725.
    [185] Krishnaswami H, Ramanarayanan V (2005) Control of high-frequency AC link electronic transformer. IEE Proceedings Electric Power Appl. IEEE, 509–516.
    [186] Fan S, Mao C, Chen L (2006) Optimal coordinated PET and generator excitation control for power systems. Int J Elec Power 28: 158–165. doi: 10.1016/j.ijepes.2005.11.001
    [187] Liu H, Mao C, Lu J, et al. (2007) Parallel operation of electronic power transformer based on distributed logic control. 42nd International Universities Power Engineering Conference (UPEC). IEEE, 93–101.
    [188] Wang D, Mao C, Lu J (2008) Coordinated control of EPT and generator excitation system for multidouble-circuit transmission-lines system. IEEE T Power Deliver 23: 371–379. doi: 10.1109/TPWRD.2007.905552
    [189] Wang D, Mao C, Lu J (2009) Operation and control mode of electronic power transformer. IEEE PES/IAS Conference on Sustainable Alternative Energy (SAE). IEEE, 1–5.
    [190] Brando G, Dannier A, Del Pizzo A, et al. (2010) A high performance control technique of power electronic transformers in medium voltage grid-connected PV plants. International Conference on Electrical Machines (ICEM). IEEE, 1–6.
    [191] Shah J, Wollenberg BF, Mohan N (2011) Decentralized power flow control for a smart micro-grid. IEEE Power and Energy Society General Meeting. IEEE, 1–6.
    [192] Schietekat LM (2011) Design and Implementation of the Main Controller of a Solid-State Transformer. Master Thesis, Stellenbosch University.
    [193] Fan H, Li H (2011) A distributed control of input-series-output-parallel bidirectional DC-DC converter modules applied for 20 kVA solid state transformer. 26th IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 939–945.
    [194] Tajfar A, Mazumder SK (2011) A transformer-flux-balance controller for a high-frequency-link inverter with applications for solid-state transformer, renewable/alternative energy sources, energy storage, and electric vehicles. IEEE Electric Ship Technologies Symposium (ESTS). IEEE, 121–126.
    [195] Zhao T, She X, Bhattacharya S, et al. (2011) Power synchronization control for capacitor minimization in solid state transformers (SST). IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2812–2818.
    [196] Parks NB (2012) Black start control of a solid state transformer for emergency distribution power restoration. Master Thesis, North Carolina State University.
    [197] Qin H, Kimball JW (2012) Closed-loop control of DC-DC dual active bridge converters driving single-phase inverters. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 173–179.
    [198] Sadeghi M, Gholami M (2012) Neural predictive model control for intelligent universal transformers in advanced distribution automation of tomorrow. 11th international conference on Applications of Electrical and Computer Engineering. IEEE, 40–45.
    [199] Shen Z, Baran ME (2013) Gradient based centralized optimal Volt/Var control strategy for smart distribution system. IEEE PES Innovative Smart Grid Technologies Conference (ISGT). IEEE, 1–6.
    [200] Ardeshir JF, Ajami A, Jalilvand A (2013) Flexible power electronic transformer for power flow control applications. J Oper Autom Power Eng 1: 147–155.
    [201] Kim SG (2014) A comprehensive study of dual active bridge converter and deep belief network controller for bi-directional solid state transformer. Master Thesis, Grad Sch UNIST.
    [202] Zheng Z, Gao Z, Gu C, et al. (2014) Stability and voltage balance control of a modular converter with multiwinding high-frequency transformer. IEEE T Power Electr 29: 4183–4194. doi: 10.1109/TPEL.2013.2290019
    [203] Pu Y, Miao H, Zeng CB, et al. (2014) A solid-state transformer with controllable input power factor and output voltage. International Conference on Power System Technology (POWERCON). IEEE, 2940–2944.
    [204] Huang H, Mao C, Lu J, et al. (2014) Electronic power transformer control strategy in wind energy conversion systems for low voltage ride-through capability enhancement of directly driven wind turbines with permanent magnet synchronous generators (D-PMSGs). Energies 7: 7330–7347. doi: 10.3390/en7117330
    [205] Shanshan W, Yubin W, Yifei L (2015) Sensorless power balance control for cascaded multilevel converter based solid state transformer. 18th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 925–1929.
    [206] Gu C, Zheng Z, Li Y (2015) Control strategies of a multiport power electronic transformer (PET) for DC distribution applications. IEEE Electric Ship Technologies Symposium (ESTS). IEEE, 135–139.
    [207] Xu K, Fu C, Wang Y, et al. (2015) Voltage and current balance control for the ISOP converter-based power electronic transformer. 18th International Conference onElectrical Machines and Systems (ICEMS). IEEE, 378–382.
    [208] Wu Q, Wang G, Feng J, et al. (2015) A novel comprehensive control scheme of modular multilevel converter-based power electronic transformer. 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 2253–2258.
    [209] Ouyang S, Liu J, Song S, et al. (2016) Reactive component injection control of the modular multi-output power electronic transformer. IEEE Annual Southern Power Electronics Conference (SPEC). IEEE, 1–7.
    [210] Wang X, Liu J, Ouyang S, et al. (2016) Control and exprimental of an H-bridge-based three-phase three-stage modular power electronic transformer. IEEE T Power Electr 31: 2002–2011. doi: 10.1109/TPEL.2015.2434420
    [211] Shah D, Crow ML (2016) Online volt-var control for distribution systems with solid-state transformers. IEEE T Power Deliver 31: 343–350. doi: 10.1109/TPWRD.2015.2457442
    [212] Liu Y, Wang W, Liu Y, et al. (2016) Control of single-stage AC-AC solid state transformer for power exchange between grids. 11th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 892–896.
    [213] Li R, Xu L, Yao L, et al. (2016) Active control of dc fault currents in dc solid-state transformers during ride-through operation of multi-terminal HVDC systems. IEEE T Energy Convers 31: 1336–1346. doi: 10.1109/TEC.2016.2575139
    [214] Ye Q, Li H (2016) Stability analysis and improvement of solid state transformer ( SST)-paralleled inverters System using negative impedance feedback control. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2237–2244.
    [215] Liu J, Yang J, Zhang J, et al. (2017) Voltage balance control based on dual active bridge DC/DC converters in a power electronic traction transformer. IEEE T Power Electr 33: 1696–1714.
    [216] Zhao B, Song Q, Li J, et al. (2017) Full-process operation, control, and experiments of modular high-frequency-link DC transformer based on dual active bridge for flexible MVDC distribution: a practical tutorial. IEEE T Power Electr 32: 6751–6766. doi: 10.1109/TPEL.2016.2626262
    [217] Zhang C, Zhao Z (2017) Dual-timescale control for power electronic zigzag transformer. CES T Electr Mach Syst 1: 315–321.
    [218] Almaguer J, Cardenas V, Aganza-Torres A, et al. (2017) Power control of a multi-cell solid-state transformer with extended functions. IEEE International Conference on Industrial Technology (ICIT). IEEE, 183–188.
    [219] Kang M, Woo BO, Enjeti PN, et al. (1998) Auto-connected electronic transformer (ACET) based multi-pulse rectifiers for utility interface of power electronic systems. IEEE Industry Applications Conference (IAS). IEEE, 1554–1561.
    [220] Baek S, Cougo B, Bhattacharya S, et al. (2012) Accurate equivalent circuit modeling of a medium-voltage and high-frequency coaxial winding DC-link transformer for solid state transformer applications. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1439–1446.
    [221] Drofenik U (2012) A 150kW medium frequency transformer optimized for maximum power density. 7th International Conference on Integrated Power Electronics Systems (CIPS). IEEE, 1–6.
    [222] Ortiz G, Leibl M, Kolar JW, et al. (2013) Medium frequency transformers for solid-state-transformer applications-Design and experimental verification. IEEE International Conference on Power Electronics and Drive Systems (PEDS). IEEE, 1285–1290.
    [223] Bahmani MA, Thiringer T, Kharezy M (2016) Optimization and experimental validation of medium-frequency high power transformers in solid-state transformer applications. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 3043–3050.
    [224] Alam KS, Tria LAR, Zhang D, et al. (2016) Design of a bi-directional DC-DC converter for solid-state transformer (SST) application by exploiting the shoot through mode. IEEE International Conference on Sustainable Energy Technologies (ICSET). IEEE, 276–281.
    [225] Leibl M, Ortiz G, Kolar JW (2017) Design and experimental analysis of a medium-frequency transformer for solid-state transformer applications. IEEE J Em Sel Top P 5: 110–123. doi: 10.1109/JESTPE.2016.2623679
    [226] Beiranvand H, Rokrok E, Rezaeealam B, et al. (2017) Optimal design of medium-frequency transformers for solid-state transformer applications. 8th Power Electronics, Drive Systems & Technologies Conference (PEDSTC ). IEEE, 154–159.
    [227] Duarte J, Hendrix M, Simoes MG (2004) A three-port bi-directional converter for hybrid fuel cell systems. 35th IEEE Annual Power Electronics Specialists Conference (PESC ). IEEE, 1–22.
    [228] Baek S (2009) Design consideations of high voltage and high frequency transformer for solid state transformer application. PhD Thesis, North Carolina State University.
    [229] Bhattacharya S, Zhao T, Wang G, et al. (2010) Design and development of generation-I silicon based solid state transformer. 25th Annual IEEE Applied Power Electronics Conference and Exposition. IEEE, 1666–1673.
    [230] Baek S, Bhattacharya S (2011) Analytical modeling of a medium-voltage and high-frequency resonant coaxial-type power transformer for a solid state transformer application. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1873–1880.
    [231] Baek S, Roy S, Bhattacharya S, et al. (2013) Power flow analysis for 3-port 3-phase dual active bridge dc/dc converter and design validation using high frequency planar transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 388–395.
    [232] Rothmund D, Ortiz G, Guillod T, et al. (2015) 10kV SiC-based isolated DC-DC converter for medium voltage-connected solid-state transformers. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1096–1103.
    [233] Reddy BD, Sahoo SK (2015) Design of solid state transformer. Int J Adv Res Electr Electron Instrum Eng 4: 357–364.
    [234] Alam KS, Tria LAR, Zhang D, et al. (2016) Design and comprehensive modelling of solid-state transformer (SST) based substation. IEEE International Conference on Power System Technology (POWERCON). IEEE, 1–6.
    [235] Huang P, Mao C, Wang D, et al. (2017) Optimal design and implementation of high-voltage high-power silicon steel core medium frequency transformer. IEEE T Ind Electron 64: 4391–4401. doi: 10.1109/TIE.2017.2674591
    [236] Ortiz G, Leibl MG, Huber JE, et al. (2017) Design and experimental testing of a resonant DC-DC converter for solid-state transformers. IEEE T Power Electr 32: 7534–7542. doi: 10.1109/TPEL.2016.2637827
    [237] Huang AQ, Wang L, Tian Q, et al. (2016) Medium voltage solid state transformers based on 15 kV SiC MOSFET and JBS diode. 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 6996–7003.
    [238] Qin H, Kimball JW (2010) A comparative efficiency study of silicon-based solid state transformers. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1458–1463.
    [239] Pena-Alzola R, Gohil G, Mathe L, et al. (2013) Review of modular power converters solutions for smart transformer in distribution system. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 380–387.
    [240] Yang T, Meere R, McKenna K, et al. (2015) The evaluation of a modular solid state transformer and low-frequency distribution transformer under daily loading profile. 17th European Conference on Power Electronics and Applications (EPE-ECCE). IEEE, 1–10.
    [241] Adabi ME, Martinez-Velasco JA (2017) MMC-based solid-state transformer model including semiconductor losses. Electr Eng, 1–18.
    [242] Guerra G, Martinez-Velasco JA (2017) A solid state transformer model for power flow calculations. Int J Electr Power Energy Syst 89: 40–51. doi: 10.1016/j.ijepes.2017.01.005
    [243] Heinemann L, Mauthe G (2001) The universal power electronics based distribution transformer, an unified approach. 32nd IEEE Annual Power Electronics Specialists Conference (PESC). IEEE, 504–509.
    [244] Sabahi M, Hosseini SH, Sharifian MB, et al. (2010) Zero-voltage switching bi-directional power electronic transformer. IET Power Electron 3: 818–828. doi: 10.1049/iet-pel.2008.0070
    [245] Fan H, Li H (2010) High frequency high efficiency bidirectional DC-DC converter module design for 10 kVA solid state transformer. 25th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 210–215.
    [246] Fan H, Li H (2010) A novel phase-shift bidirectional dc-dc converter with an extended high-efficiency range for 20 kVA solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3870–3876.
    [247] Fan H, Li H (2011) High-frequency transformer isolated bidirectional DC-DC converter modules with high efficiency over wide load range for 20 kVA solid-state transformer. IEEE T Power Electr 26: 3599–3608. doi: 10.1109/TPEL.2011.2160652
    [248] Wang Z, Xu J, Hatua K, et al. (2012) Solid state transformer specification via feeder modeling and simulation. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [249] Sastry J, Bala S (2013) Considerations for the design of power electronic modules for hybrid distribution transformers. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1422–1428.
    [250] Beldjajev V, Lehtla T, Zakis J (2013) Impact of component losses on the efficiency of the LC-filter based dual active bridge for the isolation stage of power electronic transformer. 8th International Conference-Workshop Compatibility in Power Electronics (CPE). IEEE, 132–137.
    [251] Ortiz G, Uemura H, Bortis D, et al. (2013) Modeling of soft-switching losses of IGBTs in high-power high-efficiency dual-active-bridge DC/DC converters. IEEE T Electron Dev 60: 587–597. doi: 10.1109/TED.2012.2223215
    [252] Ortiz G, Gammeter C, Kolar JW, et al. (2013) Mixed MOSFET-IGBT bridge for high-efficient medium-frequency dual-active-bridge converter in solid state transformers. 14th IEEE Workshop on Control and Modeling for Power Electronics (COMPEL). IEEE, 1–8.
    [253] Kolar JW, Ortiz G (2014) Solid-state-transformers: key components of future traction and smart grid systems. International Power Electronics Conference (IPEC). IEEE, 1–15.
    [254] Oggier GG, Ordonez M (2014) High efficiency switching sequence and enhanced dynamic regulation for DAB converters in solid-state transformers. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 326–333.
    [255] FREEDM (2014) Solid-state transformer research and development at North Carolina State university's FREEDM systems center. IEEE Power Electron Mag 1: 10–11.
    [256] She X, Yu X, Wang F, et al. (2014) Design and demonstration of a 3.6kV-120V/10KVA solid state transformer for smart grid application. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 3429–3436.
    [257] Ouyang S, Liu J, Song S, et al. (2015) Operation and efficiency analysis of an MAB based three-phase three-stage power electronic transformer. 2nd IEEE International Future Energy Electronics Conference (IFEEC). IEEE, 1–6.
    [258] Montoya RJG, Mallela A, Balda JC (2015) An evaluation of selected solid-state transformer topologies for electric distribution systems. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1022–1029.
    [259] Choi H, Park H, Jung J (2015) Design methodology of dual active bridge converter for solid state transformer application in smart grid. 9th International Conference on Power Electronics (ICPE). IEEE, 196–201.
    [260] Mirmousa H, Zolghadri MR (2007) A novel circuit topology for three-phase four-wire Distribution Electronic Power Transformer. 7th International Conference on Power Electronics and Drive Systems (PEDS). IEEE, 1215–1222.
    [261] Wang D, Mao C, Lu J (2007) Modelling of electronic power transformer and its application to power system. IET Gener Transm Dis 1: 887–895. doi: 10.1049/iet-gtd:20060477
    [262] Iman-Eini H, Schanen JL, Farhangi S, et al. (2008) A power electronic based transformer for feeding sensitive loads. IEEE Power Electronics Specialists Conference (PESC). IEEE, 2549–2555.
    [263] Mohapatra KK, Mohan N (2008) Matrix converter fed open-ended power electronic transformer for power system application. IEEE Power and Energy Society General Meeting. IEEE, 1–6.
    [264] Nath S, Mohapatra KK, Mohan N (2009) Output voltage regulation in matrix converter fed power electronic transformer for power systems application in electric ship. IEEE Electric Ship Technologies Symposium (ESTS). IEEE, 203–206.
    [265] Nath S, Mohan N (2011) A solid state power converter with sinusoidal currents in high frequency transformer for power system applications. IEEE International Conference on Industrial Technology. IEEE, 110–114.
    [266] Shahani A, Basu K, Mohan N (2012) A power electronic transformer based on indirect matrix converter for PWM AC drive with lossless commutation of leakage energy. 6th IET International Conference on Power Electronics, Machines and Drives (PEMD). IEEE, 1–6.
    [267] Basu K, Shahani A, Sahoo AK, et al. (2015) A single-stage solid-state transformer for PWM AC drive with source-based commutation of leakage energy. IEEE T Power Electr 30: 1734–1746. doi: 10.1109/TPEL.2014.2320996
    [268] Liu H, Mao C, Lu J, et al. (2009) Electronic power transformer with supercapacitors storage energy system. Electr Power Syst Res 79: 1200–1208. doi: 10.1016/j.epsr.2009.02.012
    [269] Zhao T, Zeng J, Bhattacharya S, et al. (2009) An average model of solid state transformer for dynamic system simulation. IEEE Power and Energy Society General Meeting. IEEE, 1–8.
    [270] Falcones S, Mao X, Ayyanar R (2010) Simulation of the FREEDM green hub with solid state transformers and distributed control. Future Renewable Electric Energy Distribution. IEEE, 1–5.
    [271] Wang D, Mao C, Lu J, et al. (2010) Auto-balancing transformer based on power electronics. Electr Power Syst Res 80: 28–36. doi: 10.1016/j.epsr.2009.08.002
    [272] Liu H, Yang J, Mao C, et al. (2011) Nonlinear control of electronic power transformer for distribution system using feedback linearization. IEEE Power Engineering and Automation Conference (PEAM). IEEE, 22–26.
    [273] Banaei MR, Salary E (2011) Power quality improvement based on novel power electronic transformer. 2nd Power Electronics, Drive Systems and Technologies Conference (PEDSTC). IEEE, 286–291.
    [274] Banaei MR, Salary E (2014) Mitigation of voltage sag, swell and power factor correction using solid-state transformer based matrix converter in output stage. Alexandria Eng J 53: 563–572. doi: 10.1016/j.aej.2014.06.003
    [275] Sadeghi M, Gholami M (2011) A novel distribution automation involving intelligent electronic devices as IUT. Int J Circuits Syst Signal Process 5: 443–450.
    [276] Sadeghi M, Gholami M (2012) Genetic algorithm optimization methodology for PWM Inverters of Intelligent universal transformer for the advanced distribution automation of future. Indian J Sci Technol 5: 2035–2040.
    [277] Sadeghi M (2013) Modern methodology introducing for three layers intelligent universal transformers in advanced distribution automation equipping pi voltage and current source controllers. Int J Inf Electron Eng 3: 258–261.
    [278] Mala RC, Tripathy S, Tadepalli S, et al. (2012) Performance analysis of three phase solid state transformers. International Conference on Devices, Circuits and Systems (ICDCS). IEEE, 486–490.
    [279] Alepuz S, González-Molina F, Martin-Arnedo J, et al. (2013) Time-domain model of a bidirectional distribution electronic power transformer. International Power System Transients Conference.
    [280] Alepuz S, Gonzalez F, Martin-Arnedo J, et al. (2013) Solid state transformer with low-voltage ride-through and current unbalance management capabilities. 39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 1278–1283.
    [281] Shojaei A (2014) Design of modular multilevel converter-based solid state transformers. Master Thesis, McGillUniversity.
    [282] Yang J, Mao C, Wang D, et al. (2013) Fast and continuous on-load voltage regulator based on electronic power transformer. IET Electr Power Appl 7: 499–508.
    [283] Kalyan BT, Prasad PR (2013) Analysis and design of power electronic transformer based power quality improvement. IOSR J Electr Electron Eng 5: 61–69. doi: 10.9790/1676-0516169
    [284] Roasto I, Romero-Cadaval E, Martins J (2013) Active power electronic transformer based on modular building blocks. 39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 5922–5927.
    [285] Hagh MT (2013) Dual output power electronic transformer. 21st Iranian Conference on Electrical Engineering (ICEE).
    [286] Liu Y, Escobar-Mejia A, Farnell C, et al. (2014) Modular multilevel converter with high-frequency transformers for interfacing hybrid DC and AC microgrid systems. 5th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 1–6.
    [287] Shanmugam D, Indiradevi K (2014) Implementation of multiport dc-dc converter- based solid state transformer in smart grid system. International Conference on Computer Communication and Informatics (ICCCI). IEEE, 1–6.
    [288] Ponraj T, George A (2014) A solid state transformer integrating distributed generation and storage. Int J Innov Res Comput Commun Eng 2: 4029–4035.
    [289] Sahoo AK, Mohan N (2014) A power electronic transformer with sinusoidal voltages and currents using modular multilevel converter. International Power Electronics Conference (IPEC). IEEE, 3750–3757.
    [290] Ahmed KY, Yahaya NZ, Asirvadam VS (2014) Optimal analysis and design of power electronic distribution transformer. Res J Appl Sci Eng Technol 7: 1734–1743.
    [291] Contreras JP, Ramirez JM (2014) Multi-fed power electronic transformer for use in modern distribution systems. IEEE T Smart Grid 5: 1532–1541. doi: 10.1109/TSG.2013.2293479
    [292] Yu X, She X, Zhou X, et al. (2014) Power management for DC microgrid enabled by solid-state transformer. IEEE T Smart Grid 5: 954–965. doi: 10.1109/TSG.2013.2277977
    [293] Zhabelova G, Yavarian A, Vyatkin V, et al. (2015) Data center energy efficiency and power quality : an alternative approach with solid state transformer. 41st Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 1294–1300.
    [294] Tarisciotti L, Zanchetta P, Watson A, et al. (2015) Multiobjective modulated model predictive control for a multilevel solid-state transformer. IEEE T Ind Appl 51: 4051–4060. doi: 10.1109/TIA.2015.2429113
    [295] Sun Y, Liu J, Li Y, et al. (2016) Research on voltage and switching balance control for cascaded power electronic transformer under hybrid PWM modulation. 8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia). IEEE, 2033–2038.
    [296] Gu C, Zheng Z, Xu L, et al. (2016) Modeling and control of a multiport power electronic transformer ( PET ) for electric traction applications. IEEE T Power Electron 31: 915–927. doi: 10.1109/TPEL.2015.2416212
    [297] Liu B, Zha Y, Zhang T, et al. (2016) Solid state transformer application to grid connected photovoltaic inverters. International Conference on Smart Grid and Clean Energy Technologies (ICSGCE ). IEEE, 248–251.
    [298] Syed I, Khadkikar V (2017) Replacing the grid interface transformer in wind energy conversion system with solid-state transformer. IEEE T Power Syst 32: 2152–2160.
    [299] Qin H, Kimball JW (2009) AC-AC dual active bridge converter for solid state transformer. In: IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3039–3044.
    [300] Shanmugam D, Balakrishnan D, Indiradevi K (2012) Solid state transformer integration in smart grid system. Int J Sci Technol 3: 8–14.
    [301] Shanmugam D, Balakrishnan D, Indiradevi K (2013) A multiport dc-dc converter-based solid state transformer in smart grid system. Int J Recent Trends Electr Electron Eng 3: 1–9.
    [302] Jiang Y, Breazeale L, Ayyanar R, et al. (2012) Simplified solid state transformer modeling for real time digital simulator (RTDS). IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1447–1452.
    [303] Ghias AMYM, Ciobotaru M, Agelidis VG, et al. (2012) Solid state transformer based on the flying capacitor multilevel converter for intelligent power management. IEEE Power Engineering Society Conference and Exposition in Africa (PowerAfrica). IEEE, 1–7.
    [304] Malan WL, Vilathgamuwa DM, Walker GR, et al. (2016) A three port resonant solid state transformer with minimized circulating reactive currents in the high frequency link. IEEE Annual Southern Power Electronics Conference (SPEC ). IEEE, 1–6.
    [305] Mo R, Mao C, Lu J, et al. (2012) Three-stage solid state transformer modeling through real time digital simulation with controller hardware-in-the-loop. 7th International Power Electronics and Motion Control Conference (IPEMC). IEEE, 1116–1119.
    [306] Castelino G, Mohan N (2013) Modulation and commutation of matrix converter based power electronic transformer using a single FPGA.39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 4892–4898.
    [307] Qin H, Kimball JW (2014) Closed-loop control of DC-DC dual-active-bridge converters driving single-phase inverters. IEEE T Power Electr 29: 1006–1017. doi: 10.1109/TPEL.2013.2257859
    [308] Ouyang S, Liu J, Wang X, et al. (2015) A single phase power electronic transformer considering harmonic compensation in scott traction system. 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia). IEEE, 2620–2627.
    [309] Parimi M, Monika M, Rane M, et al. (2016) Dynamic phasor-based small-signal stability analysis and control of solid state transformer. 6th IEEE International Conference on Power Systems (ICPS ). IEEE, 1–6.
    [310] Saghaleini M, Farhangi S (2007) Distributed power supply with power factor correction: A solution to feed all modules in power electronic transformers. 7th International Conference on Power Electronics (ICPE). IEEE, 1225–1229.
    [311] Saghaleini M, Hekmati A, Farhangi S (2007) An advanced distributed power supply for power electronic transformers. 33rd Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 2038–2043.
    [312] Xue J (2010) Single-phase vs. three-phase high power high frequency transformers. Master Thesis,Virginia Polytech Inst State University.
    [313] Hosseini SH, Sharifian MBB, Sabahi M, et al. (2009) A tri-directional power electronic transformer for photo voltaic based distributed generation application. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [314] Hosseini SH, Sharifian MBB, Sabahi M, et al. (2009) Bi-directional power electronic transformer based compact dynamic voltage restorer. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [315] Hu W, Cheng J, Chen M, et al. (2012) Research on distribution IUT based on three voltage level topology. China International Conference on Electricity Distribution (CICED). IEEE, 1–5.
    [316] Mazgar FN, Hagh MT, Babaei E (2012) Distribution electronic power transformer with reduced number of power switches. 3rd Power Electronics and Drive Systems Technology (PEDSTC). IEEE, 324–329.
    [317] Venkat J, Shukla A, Kulkarni SV (2014) Operation of a three phase solid state transformer under unbalanced load conditions. IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 1–6.
    [318] Khazraei M, Prabhala VAK, Ahmadi R, et al. (2014) Solid state transformer stability and control considerations. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2237–2244.
    [319] Shah DG, Crow ML (2014) Stability design criteria for distribution systems with solid-state transformers. IEEE T Power Deliver 29: 2588–2595.
    [320] Zhou K, Jin Q, Lan Z, et al. (2015) The study of power electronic transformer on power flow control and voltage regulation in DC micro-grid. 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 2166–2172.
    [321] Zhou K, Chu H (2015) Study on the optimal DC voltage control for power electronic transformer. 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 2270–2275.
    [322] Paladhi S, Ashok S (2015) Solid state transformer application in wind based DG system. IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES). IEEE, 1–5.
    [323] Jakka VNSR, Shukla A (2016) A triple port active bridge converter based multi- fed power electronic transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1–8.
    [324] Jakka VNSR, Shukla A (2016) Integration of AC and DC sources using multi-source fed power electronic transformer (MSF-PET) for modern power distribution system applications. 18th European Conference on Power Electronics and Applications. IEEE, 1–9.
    [325] Shah D, Crow M (2016) Online volt-var control for distribution systems with solid state transformers. IEEE T Power Deliver 31: 343–350. doi: 10.1109/TPWRD.2015.2457442
    [326] Wen H, Yang R (2016) Power management of solid state transformer in microgrids. IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 1399–1404.
    [327] Liu C, Zhi Y, Zhang Y, et al. (2016) New breed of solid-state transformer distribution tail system for flexible power conversion between medium-voltage distribution and low-voltage customer side. 1EEE PES Asia-Pacific Power and Energy Conference (APPEEC). IEEE, 403–407.
    [328] Zhou T, Xu Y (2017) Fault characteristic analysis and simulation of power electronic transformer based on MMC in distribution network. First IEEE International Conference on Energy Internet. IEEE, 332–337.
    [329] Fan B, Li Y, Wang K, et al. (2017) Hierarchical system design and control of an MMC-based power-electronic transformer. IEEE T Ind Inform 13: 238–247. doi: 10.1109/TII.2016.2522190
    [330] Martin-Arnedo J, Gonzalez-Molina F, Martinez-Velasco JA, et al. (2012) Development and testing of a distribution electronic power transformer model. IEEE Power and Energy Society General Meeting. IEEE, 1–6.
    [331] Martin-Arnedo J, González-Molina F, Martinez-Velasco JA, et al. (2017) EMTP model of a bidirectional cascaded multilevel solid state transformer for distribution system studies. Energies 10: 521–539. doi: 10.3390/en10040521
    [332] Moonem MA, Krishnaswami H (2012) Analysis of dual active bridge based power electronic transformer as a three-phase inverter. 38th Annual Conference on IEEE Industrial Electronics Society (IECON). IEEE, 238–243.
    [333] Moonem MA, Krishnaswami H (2012) Analysis and control of multi-level dual active bridge DC-DC converter. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1556–1561.
    [334] Li H, Wang Y, Yu C (2016) Control of three-phase cascaded multilevel converter based power electronic transformer under unbalanced input voltages. 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 3299–3304.
    [335] Li H, Wang Y, Yu C (2016) Research on voltage balance and power balance control for three-phase cascaded multilevel converter based power electronic transformer. 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 3588–3593.
    [336] Facchinello GG, Mamede H, Brighenti LL, et al. (2016) AC-AC hybrid dual active bridge converter for solid state transformer. 7th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG). IEEE, 1–8.
    [337] Hunziker NS (2016) Solid-state transformer modeling for analyzing its application in distribution grids. PCIM Europe; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. IEEE, 2167–2174.
    [338] Lai JS, Maitra A, Mansoor A, et al. (2005) Multilevel intelligent universal transformer for medium voltage applications. Industry Applications Conference. IEEE, 1893–1899.
    [339] Tatcho P, Jiang Y, Li H (2011) A novel line section protection for the FREEDM system based on the solid state transformer. IEEE Power and Energy Society General Meeting. IEEE, 1–8.
    [340] Tatcho P, Li H, Jiang Y, et al. (2013) A novel hierarchical section protection based on the solid state transformer for the future renewable electric energy delivery and management (FREEDM) system. IEEE T Smart Grid 4: 1096–1104. doi: 10.1109/TSG.2012.2207412
    [341] Ye Q, Mo R, Li H (2017) Multiple resonances mitigation of paralleled inverters in a solid-state transformer (SST) enabled ac microgrid. IEEE T Smart Grid.
    [342] Maheswari M, Kumar NS (2015) Design and control of power electronic transformer with power factor correction. International Conference on Circuit, Power and Computing Technologies (ICCPCT). IEEE, 1–6.
    [343] Devi SV, Kumar NS (2016) Design of power electronic transformer based variable speed wind energy conversion system. International Conference on Circuit, Power and Computing Technologies (ICCPCT). IEEE, 1–7.
    [344] Falcones S, Mao X, Ayyanar R (2011) Simulink block-set for modeling distribution systems with solid state transformer. IEEE, 1–4.
    [345] Gonzalez-Agudelo D, Escobar-Mejia A, Ramirez-Murrillo H (2016) Dynamic model of a dual active bridge suitable for solid state transformers. 13th International Conference on Power Electronics (CIEP). IEEE, 350–355.
    [346] Busada C, Chiacchiarini H, Jorge SG, et al. (2017) Modeling and control of a medium voltage three-phase solid-state transformer. 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). IEEE, 556–561.
    [347] Posada CJ, Ramirez JM, Correa RE (2012) Modeling and simulation of a solid state transformer for distribution systems. IEEE Power and Energy Society General Meeting. IEEE, 1–6.
    [348] He L, Zhang J, Chen C, et al. (2018) Bidirectional bridge modular switched-capacitor-based power electronics transformer. IEEE T on Ind Electron 65: 718–726. doi: 10.1109/TIE.2016.2642881
    [349] Ramachandran V, Kuvar A, Singh U, et al. (2014) A system level study employing improved solid state transformer average models with renewable energy integration. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [350] Yu Z, Ayyanar R, Husain I (2015) A detailed analytical model of a solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 723–729.
    [351] Arafat-Khan MT, Milani AA, Chakrabortty A, et al. (2016) Comprehensive dynamic modeling of a solid-state transformer based power distribution system. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1–8.
    [352] Martin-Arnedo J, González-Molina F, Martínez-Velasco JA, et al. (2016) Implementation of a custom-made model for a multilevel solid state transformer. EEUG.
    [353] Huasheng M, Bo Z, Jianchao Z, et al. (2005) Dynamic characteristics analysis and instantaneous value control design for buck-type power electronic transformer (PET). 31st Annual Conference of IEEE Industrial Electronics Society (IECON). IEEE, 1043–1047.
    [354] Bahadornejad M, Nair NK, Zhabelova G, et al. (2011) Modeling solid state transformer in IEC 61850. 37th Annual Conference on IEEE Industrial Electronics Society (IECON). IEEE, 2706–2710.
    [355] Kieferndorf R, Venkataramanan G, Manjrekar MD (2000) A power electronic transformer (PET) fed nine-level H-bridge inverter for large induction motor drives. IEEE Industry Applications Conference. IEEE, 2489–2495.
    [356] Wrede H, Staudt V, Steimel A (2002) Design of an electronic power transformer. 28th IEEE Annual Conference of the Industrial Electronics Society (IECON ). IEEE, 1380–1385.
    [357] Wang D, Mao C, Lu J, et al. (2005) The research on characteristics of electronic power transformer for distribution system. IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific. IEEE, 1–5.
    [358] Iman-Eini H, Farhangi S (2006) Analysis and design of power electronic transformer for medium voltage levels. 37th IEEE Power Electronics Specialists Conference (PESC). IEEE, 1–5.
    [359] Iman-Eini H, Farhangi S, Schanen JL, et al. (2007) Design of power electronic transformer based on cascaded H-bridge multilevel converter. IEEE International Symposium on Industrial Electronics (ISIE). IEEE, 877–882.
    [360] Jovcic D (2009) Bidirectional, high-power DC transformer. IEEE T Power Deliver 24: 2276–2283. doi: 10.1109/TPWRD.2009.2028600
    [361] Castelino G, Basu K, Mohan N (2010) Power electronic transformer with reduced number of switches: Analysis of clamp circuit for leakage energy commutation. In: Joint International Conference on Power Electronics, Drives and Energy Systems (PEDES) & Power India. IEEE, 656–661.
    [362] Wang J, Wang G, Bhattacharya S, et al. (2010) Comparison of 10-kV SiC power devices in solid-state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3284–3289.
    [363] Basu K, Mohan N (2010) A power electronic transformer for three phase PWM AC/AC drive with loss less commutation and common-mode voltage suppression. 36th Annual Conference on IEEE Industrial Electronics Society (IECON). IEEE, 315–320.
    [364] Castelino G, Basu K, Mohan N (2010) Power electronic transformer with reduced number of switches: Analysis of clamp circuit for leakage energy commutation. Joint International Conference on Power Electronics, Drives and Energy Systems (PEDES) &Power India. IEEE, 1–8.
    [365] Basu K, Somani A, Mohapatra KK, et al. (2010) A power electronic transformer-based three-phase PWM AC drive with lossless commutation of leakage energy. International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 1194–1200.
    [366] Wang Z, Yu K (2010) The research of power electronic transformer (PET) in smart distribution network. International Conference on Power System Technology (POWERCON). IEEE, 1–7.
    [367] Banaei MR, Salary E (2010) Mitigation of current harmonics and unbalances using power electronic transformer. 25th International Power System Conference (PSC). IEEE, 1–9.
    [368] Wang H, Guo TX, Li QM, et al. (2011) Development and applicability analysis of intelligent solid state transformer. 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 1150–1154.
    [369] Beldjajev V, Roasto I (2011) Analysis of new bidirectional DC-DC converter based on current doubler rectifier. 10th International Symposium onTopical Problems in the Field of Electrical and Power Engineering. IEEE, 234–237.
    [370] Zhang J, Wang W, Bhattacharya S (2012) Architecture of solid state transformer-based energy router and models of energy traffic. IEEE PES Innovative Smart Grid Technologies (ISGT). IEEE, 1–8.
    [371] Banaei MR, Salary E (2012) Four-wire solid state transformer to improve current quality. Gazi Univ J Sci 25: 887–899.
    [372] Rodríguez JR, Moreno-Goytia EL, Venegas V (2012) State of the art, modeling and simulation of an advanced power electronics transformer. North American Power Symposium (NAPS). IEEE, 1–6.
    [373] Wang F, She X, Wang G, et al. (2012) Parallel operation of solid state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1433–1438.
    [374] Qin H (2012) Dual active bridge converters in solid state transformers. PhD Thesis, Missouri University Sci Technol.
    [375] Beldjajev V, Roasto I, Zakis J (2012) Isolation stage for power electronic transformer: dual active bridge based isolation stage for power electronic transformer. International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 849–854.
    [376] Zhu M, Zhao R, Zhang H, et al. (2012) A novel solution using two-port network models for transient analysis of full-bridge DC-DC converter in solid state transformer. 15th IEEE International Conference on Electrical Machines and Systems (ICEMS). IEEE, 1–4.
    [377] Wani M, Kurundkar K, Bhawalkar MP (2012) Use of power electronic converters to suppress transformer inrush current. IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE.
    [378] Ji Z, Sun Y, Wang S, et al. (2012) Design of a three-phase cascaded power electronic transformer based on energy internet. International Conference on Sustainable Power Generation and Supply (SUPERGEN). IEEE, 1–6.
    [379] Beldjajev V, Roasto I, Zakis J (2012) Isolation stage for power electronic transformer: Dual active bridge vs bi-directional current doubler rectifier. 21st International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 849–854.
    [380] Pavlović Z (2013) Multiple input-output bidirectional solid state transformer based on a series resonant converter. PhD Thesis, University Politécnica Madrid.
    [381] Madhusoodhanan S, Cho Y, Kadavelugu A, et al. (2013) Comparative evaluation of SiC devices for PWM buck rectifier based active front end converter for MV grid interface. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3034–3041.
    [382] Carr J, Wang Z, Bhattacharya S, et al. (2013) Transient overvoltage rating and BIL of the transformerless intelligent power substation. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [383] Carr J, Wang Z, Bhattacharya S, et al. (2013) Overloading and overvoltage evaluation of a Transformerless Intelligent Power Substation. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [384] Wang X, Ouyang S, Liu J, et al. (2013) Comparison on unbalanced-load handling capability of two power electronic transformer topologies. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 5266–5272.
    [385] Sang Z, Mao C, Lu J, et al. (2013) Analysis and simulation of fault characteristics of power switch failures in distribution electronic power transformers. Energies 6: 4246–4268. doi: 10.3390/en6084246
    [386] Pena-Alzola R, Mathe L, Liserre M, et al. (2013) DC-bias cancellation for phase shift controlled dual active bridge. 39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 596–600.
    [387] Roasto I, Romero-Cadaval E, Martins J, et al. (2013) Active power electronic transformer as a power conditioner for nonlinear loads. 8th International Conference-Workshop Compatibility in Power Electronics (CPE). IEEE, 63–68.
    [388] Beldjajev V, Rang T, Zakis J (2013) Steady state analysis of the commutating LC filter based dual active bridge for the isolation stage of power electronic transformer. 8th International Conference-Workshop Compatibility in Power Electronics (CPE). IEEE, 138–143.
    [389] Reddy SM, Khandrika B (2013) A comparison study of solid state transformers using different switching techniques. Int J Sci Res 2: 314–318.
    [390] Huber J, Ortiz G, Krismer F, et al. (2013) η-ρ Pareto optimization of bidirectional half-cycle discontinuous-conduction-mode series-resonant DC/DC converter with fixed voltage transfer ratio. 28th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1413–1420.
    [391] Huber JE, Kolar JW (2013) Optimum number of cascaded cells for high-power medium-voltage AC–DC converters. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 359–366.
    [392] Wang X, Ouyang S, Liu J, et al. (2014) Research of the voltage and current sharing issue of an H-bridge based power electronic transformer. 29th Annual IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2216–2222.
    [393] Guillod T, Huber JE, Ortiz G, et al. (2014) Characterization of the voltage and electric field stresses in multi-cell solid-state transformers. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4726–4734.
    [394] Ji IH, Wang S, Lee B, et al. (2014) Design and fabrication of high current AlGaN/GaN HFET for Gen III solid state transformer. 2nd IEEE Workshop on Wide Bandgap Power Devices and Applications (WiPDA). IEEE, 63–65.
    [395] Wang Q, Liang D, Du J (2014) Performance study of solid state transformer applying BP artificial neural network PID regulator. 17th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2440–2444.
    [396] Raju R (2014) Silicon carbide-high voltage , high frequency conversion. NIST High Megawatt Variable Speed Drive Technology Workshop.
    [397] Huber JE, Kolar JW (2014) Common-mode currents in multi-cell solid-state transformers. International Power Electronics Conference (IPEC). IEEE, 766–773.
    [398] Hooshyar H, Baran ME (2014) Fault analysis on distribution feeders employing solid state transformers. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [399] Sailaja M, Wahab S, Reddy ML (2014) A cascaded H-bridge converter instigated for a solid- state transformer to restrain voltage and power. Int J Ind Electron Electr Eng 2: 25–29.
    [400] Tashackori A, Hosseini SH, Sabahi M (2015) Power quality improvement using a power electronic transformer basde DVR. 23rd Iranian Conference on Electrical Engineering (ICEE). IEEE, 1597–1601.
    [401] Zhou H, Zhang W, Wu X (2015) Optimization of reactive power for active distribution network with power electronic transformer. 12th International Conference on the European Energy Market (EEM). IEEE, 1–5.
    [402] Roy RB, Rokonuzzaman M, Hossam-E-Haider M (2015) Design and analysis of the power electronic transformer for power quality improvement. International Conference on Electrical Engineering and Information Communication Technology (ICEEICT). IEEE, 1–5.
    [403] Miñambres-Marcos V, Roasto I, Romero-Cadaval E, et al. (2015) Single-phase power electronics transformer with active functions for smart grid. 9th International Conference on Compatibility and Power Electronics (CPE). IEEE, 528–533.
    [404] Guillod T, Krismer F, Färber R, et al. (2015) Protection of MV/LV solid-state transformers in the distribution grid. 41th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 3531–3538.
    [405] Shah DG, Crow ML (2015) Stability assessment extensions for single-phase distribution solid-state transformers. IEEE T Power Deliver 30: 1636–1638. doi: 10.1109/TPWRD.2015.2394305
    [406] Wang D, Tian J, Mao C, et al. (2016) A 10-kV/400-V 500-kVA electronic power transformer. IEEE T Ind Electron 63: 6653–6663. doi: 10.1109/TIE.2016.2586440
    [407] Mamede HR, Dos Santos WM, Martins DC (2016) A DAB-based solid-state transformer with high reliability as to the power supply. 13th IEEE Brazilian Power Electronics Conference and 1st Southern Power Electronics Conference (COBEP/SPEC). IEEE, 1–6.
    [408] Sundaramoorthy RS, Udhayakumar G (2016) Power management using modified solid state transformer for AC distribution system. International Conference on Emerging Trends in Engineering, Technology and Science (ICETETS ). IEEE, 1–6.
    [409] Yang Z, Xiaopin Y (2016) Fast equivalent modeling of input series output parallel HVDC solid state transformer with LLC structure. IEEE International Conference on Power and Renewable Energy. IEEE, 160–164.
    [410] Huber JE, Rothmund D, Wang L, et al. (2016) Full-ZVS modulation for all-SiC ISOP-type isolated front end (IFE) solid-state transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 1–8.
    [411] Rana MM, Rahman R, Rahman M (2016) Solid state transformer based on cascade multilevel converter for distribution network. 9th International Conference on Electrical and Computer Engineering (ICECE ). IEEE, 527–529.
    [412] Huang AQ, Zhu Q, Wang L, et al. (2017) 15 kV SiC MOSFET : an enabling technology for medium voltage solid state transformers. CPSS T Power Electron Appl 2: 118–130.
    [413] Costa LF, Carne GD, Buticchi G, et al. (2017) The smart transformer: a solid-state transformer tailored to provide ancillary services to the distribution grid. IEEE Ind Electron Mag 4: 56–67.
    [414] Huber JE, Böhler J, Rothmund D, et al. (2017) Analysis and cell-level experimental verification of a 25 kW all-SiC isolated front end 6.6 kV/400 V AC-DC solid-state transformer. CPSS T Power Electron Appl 2: 140–148.
    [415] Baranwal R, Castelino GF, Iyer K, et al. (2018) A dual active bridge based single phase AC to DC power electronic transformer with advanced features. IEEE T Power Electr 33: 313–331. doi: 10.1109/TPEL.2017.2669148
    [416] She X, Burgos R, Wang G, et al. (2012) Review of solid state transformer in the distribution system: From components to field application. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4077–4084.
    [417] She X, Huang A (2013) Solid state transformer in the future smart electrical system. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [418] Contreras JP, Ramirez JM, Marin JV, et al. (2013) Distribution systems equipped with power electronic transformers. IEEE Grenoble PowerTech (POWERTECH). IEEE, 1–6.
    [419] Rothmund D, Ortiz G, Kolar JW (2014) SiC-based unidirectional solid-state transformer concepts for directly interfacing 400V DC to medium-voltage AC distribution systems. 36th IEEE International Telecommunications Energy Conference (INTELEC). IEEE, 1–9.
    [420] Roasto I, Romero-Cadaval E, Martins J, et al. (2012) State of the art of active power electronic transformers for smart grids. 38th Annual Conference on IEEE Industrial Electronics Society (IECON). IEEE, 5241–5246.
    [421] Dutta S, Bhattacharya SRS (2013) Integration of multi-terminal DC to DC hub architecture with solid state transformer for renewable energy integration. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4793–4800.
    [422] Doncker RWD (2014) Power electronic technologies for flexible DC distribution grids. International Power Electronics Conference Power (IPEC). IEEE, 736–743.
    [423] Huang A, Cheng L, Palmour JW, et al. (2014) Ultra high voltage SiC power devices and its impact on future power delivery system. International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management. IEEE, 19–26.
    [424] Rodrigues WA, Santana RAS, Cota APL, et al. (2016) Integration of solid state transformer with DC microgrid system. IEEE Annual Southern Power Electronics Conference (SPEC). IEEE, 1–6.
    [425] Rashidi M, Nasiri A, Cuzner R (2016) Application of multi-port solid state transformers for microgrid-based distribution systems. IEEE International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 605–610.
    [426] Wang S, Zheng Z, Li Y, et al. (2016) A modular DC solid state transformer for future onboard DC grid. In: International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles and International Transportation Electrification Conference (ESARS-ITEC). IEEE, 1–6.
    [427] Biswas S, Dhople S, Mohan N (2013) A three-port bidirectional DC-DC converter with zero-ripple terminal currents for PV/microgrid applications. 39th Annual Conference of the IEEE Industrial Electronics Society (IECON). IEEE, 340–345.
    [428] Falcones S, Ayyanar R, Mao X (2013) A DC-DC Multiport-converter-based solid-state transformer integrating distributed generation and storage. IEEE T Power Electr 28: 2192–2203. doi: 10.1109/TPEL.2012.2215965
    [429] Brando G, Dannier A, Rizzo R (2009) Power electronic transformer application to grid connected photovoltaic systems. International Conference on Clean Electrical Power. IEEE, 685–690.
    [430] Zengin S, Boztepe M (2014) Modified dual active bridge photovoltaic inverter for solid state transformer applications. International Symposium on Fundamentals of Electrical Engineering (ISFEE). IEEE, 1–4.
    [431] Chen Q, Liu N, Hu C, et al. (2017) Autonomous energy management strategy for solid-state transformer to integrate PV-assisted EV charging station participating in ancillary service. IEEE T Ind Inform 13: 258–269. doi: 10.1109/TII.2016.2626302
    [432] Taghizadeh M, Sadeh J, Kamyab E (2011) Protection of grid connected photovoltaic system during voltage sag. International Conference on Advanced Power System Automation and Protection (APAP). IEEE, 2030–2035.
    [433] Xin H, Buhan Z (2011) The applications of the electronic power transformer in photovoltaic systems. International Conference on Electrical and Control Engineering (ICECE). IEEE, 3691–3694.
    [434] Foureaux NC, Adolpho L, Silva SM, et al. (2014) Application of solid state transformers in utility scale solar power plants. 40th IEEE Photovoltaic Specialist Conference (PVSC). IEEE, 3695–3700.
    [435] Mazza LC, Oliveira D, Antunes F, et al. (2016) Bidirectional converter with high frequency isolation feasible to solid state transformer applications. 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe). IEEE, 1–9.
    [436] Ankita V, Vijayakumari A (2016) A reduced converter count solid state transformer for grid connected photovoltaic applications. International Conference on Emerging Technological Trends (ICETT). IEEE, 1–7.
    [437] Razmkhah M, Azizian MR, Madadi KH (2017) Photovoltaic systems based on power electronic transformer with maximum power tracking capability. 22nd Electrical Power Distribution Conference. IEEE, 74–79.
    [438] Zhu R, Carne GD, Deng F, et al. (2017) Integration of large photovoltaic and wind system by means of smart transformer. IEEE T Ind Electron 64: 8928–8938. doi: 10.1109/TIE.2017.2701758
    [439] She X, Wang F, Burgos R, et al. (2012) Solid state transformer interfaced wind energy system with integrated active power transfer, reactive power compensation and voltage conversion functions. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 3140–3147.
    [440] Prakash TRD, Kumar RS (2013) Design of single phase power electronic transformer for low voltage miniature synchronous wind electric generator. Int J Adv Inf Sci Technol 19: 1–8.
    [441] Gao R, Husain I, Wang F, et al. (2015) Solid-state transformer interfaced PMSG wind energy conversion system. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 1310–1317.
    [442] Tan NML, Abe T, Akagi H (2012) Design and performance of a bidirectional isolated DC-DC converter for a battery energy storage system. IEEE T Power Electr 27: 1237–1248. doi: 10.1109/TPEL.2011.2108317
    [443] Said RG, Abdel-Khalik AS, El Zawawi A, et al. (2014) Integrating flywheel energy storage system to wind farms-fed HVDC system via a solid state transformer. 3rd International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 375–380.
    [444] Gao R, Husain I, Huang AQ (2016) An autonomous power management strategy based on DC bus signaling for solid-state transformer interfaced PMSG wind energy conversion system. IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 3383–3388.
    [445] Sandeep PV, Vidyapeetham A (2016) Grid connected wind driven permanent magnet synchronous generator with high frequency solid state transformer. International Conference on Emerging Technological Trends (ICETT). IEEE, 1–6.
    [446] She X, Huang AQ, Lukic S, et al. (2012) On integration of solid-state transformer with zonal DC microgrid. IEEE T Smart Grid 3: 975–985. doi: 10.1109/TSG.2012.2187317
    [447] Yu J, Wu Z, Bhattacharya S (2013) Power dispatch strategy in microgrid integrated with solid state transformer. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [448] Rodrigues WA, Morais LMF, Oliveira TR, et al. (2016) Analysis of solid state transformer based microgrid system. 12th IEEE International Conference on Industry Applications (INDUSCON). IEEE, 1–6.
    [449] Wei L, Hong F, Andong W, et al. (2017) Research of microgrid connecting interface based on multi-port power electronic transformer. 20th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 1–6.
    [450] Kang M, Enjeti PN, Pitel IJ (1997) Analysis and design of electronic transformers for electric power distribution system. IEEE Industry Applications Conference (IAS). IEEE, 1689–1694.
    [451] Manjrekar MD, Kieferndorf R, Venkataramanan G (2000) Power electronic transformers for utility applications. IEEE Industry Applications Conference. IEEE, 2496–2502.
    [452] Chinthavali MS (2003) Silicon carbide GTO thyristor loss model for HVDC application. Master Thesis, University Tennesee.
    [453] Ratanapanachote S (2004) Applications of an electronic transformer in a power distribution system. PhD Thesis, Texas A&M University.
    [454] Dieckerhoff S, Bernet S, Krug D (2005) Power loss-oriented evaluation of high voltage IGBTs and multilevel converters in transformerless traction applications. IEEE T Power Electr 20: 1328–1336. doi: 10.1109/TPEL.2005.857534
    [455] Wang D, Mao C, Lu J, et al. (2007) Theory and application of distribution electronic power transformer. Electr Power Syst Res 77: 219–226. doi: 10.1016/j.epsr.2006.02.012
    [456] Krishnamurthy H, Ayyanar R (2008) Stability analysis of cascaded converters for bidirectional power flow applications. 30th IEEE InternationalTelecommunications Energy Conference (INTELEC). IEEE, 1–8.
    [457] Miller LE, Schoene J, Kunte R, et al. (2013) Smart grid opportunities in islanding detection. IEEE Power and Energy Society General Meeting. IEEE, 1–4.
    [458] Thamaraiselvi R, Ramesh P, Baskaran J, et al. (2013) A survey of PV based solid state transformer for storage and distribution applications. Int J Sci Eng Res 4: 137–141.
    [459] Carne GD, Liserre M, Christakou K, et al. (2014) Integrated voltage control and line congestion management in active distribution networks by means of smart transformers. 23rd IEEE International Symposium on Industrial Electronics (ISIE). IEEE, 2613–2619.
    [460] Bansode SG, Joshi PM (2014) Solid state transformers : new approach and new opportunity. 11th IRF International Conference.
    [461] Gu C, Zheng Z, Li YD (2015) A power electronic transformer (PET) with converters for electric traction applications. IEEE Transportation Electrification Conference and Expo (ITEC). IEEE, 1–6.
    [462] Evans NM, Lagier T, Pereira A (2016) A preliminary loss comparison of solid-state transformers in a rail application employing silicon carbide (SiC) MOSFET switches. 8th IET International Conference onPower Electronics, Machines and Drives (PEMD ). IEEE, 1–6.
    [463] Joca DR, Barreto LHSC, Oliveira DDS, et al. (2016) Three-phase AC-DC solid-state transformer for low-voltage DC power distribution applications. 12th IEEE International Conference on Industry Applications (INDUSCON). IEEE, 1–8.
    [464] Rodriguez LAG, Jones V, Oliva A, et al. (2017) A new SST topology comprising boost three-level AC/DC converters for applications in electric power distribution systems. IEEE J Em Sel Top P 5: 735–746. doi: 10.1109/JESTPE.2017.2677523
    [465] Feng J, Chu WQ, Zhang Z, et al. (2017) Power electronic transformer based railway traction systems: challenges and opportunities. IEEE J Em Sel Top P 5: 1237–1253. doi: 10.1109/JESTPE.2017.2685464
    [466] Zhao B, Song Q, Li J, et al. (2017) Modular multilevel high-frequency-link dc transformer based on dual active phase-shift principle for medium-voltage DC power distribution application. IEEE T Power Electr 32: 1779–1791. doi: 10.1109/TPEL.2016.2558660
    [467] Dujic D, Kieferndorf F, Canales F (2012) Power electronic transformer technology for traction applications-An overview. Electronics 16: 50–56.
    [468] Hugo N, Stefanutti P, Pellerin M, et al. (2007) Power electronics traction transformer. European Conference on Power Electronics and Applications (EPE). IEEE, 1–10.
    [469] Claesens M, Dujic D, Canales F, et al. (2012) Traction transformation: A power-electronic traction transformer (PETT). ABB Rev, 11–17.
    [470] Dujic D, Kieferndorf F, Canales F, et al. (2012) Power electronic traction transformer technology. 7th International Power Electronics and Motion Control Conference (IPEMC). IEEE, 636–642.
    [471] Zhao C, Weiss M, Mester A, et al. (2012) Power electronic transformer (PET) converter: Design of a 1.2MW demonstrator for traction applications. 21st International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 855–860.
    [472] Dujic D, Zhao C, Mester A, et al. (2013) Power electronic traction transformer-low voltage prototype. IEEE T Power Electr 28: 5522–5534. doi: 10.1109/TPEL.2013.2248756
    [473] Hosseini SH, Sharifian MB, Sabahi M, et al. (2008) Bi-directional power electronic transformer for induction heating systems. Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 347–350.
    [474] Sabahi M, Hosseini SH, Sharifian MBB, et al. (2009) A three-phase dimmable lighting system using a bidirectional power electronic transformer. IEEE T Power Electr 24: 830–837. doi: 10.1109/TPEL.2008.2010344
    [475] Shah J, Gupta RK, Mohapatra KK, et al. (2010) Power management with a dynamic power limit by a power electronic transformer for micro-grid. IEEE PES General Meeting. IEEE, 1–5.
    [476] Bignucolo F, Bertoluzzo M, Fontana C (2015) Applications of the solid state transformer concept in the electrical power system. AEIT International Annual Conference (AEIT). IEEE, 1–6.
    [477] Yan J, Zhu X, Lu N (2015) Smart hybrid house test systems in a solid-state transformer supplied microgrid. IEEE Power and Energy Society General Meeting. IEEE, 1–5.
    [478] Huber JE, Kolar JW (2014) Volume/weight/cost comparison of a 1 MVA 10 kV/400 V solid-state against a conventional low-frequency distribution transformer. IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 4545–4552.
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