Power electronic transformer based on LLC resonant converter

被引：2

作者：

Chen, Qichao ^{[1
]}

Wang, Jianze ^{[1
]}

Ji, Yanchao ^{[1
]}

机构：

[1] School of Electrical Engineering and Automation, Harbin Institute of Technology

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2014年 / 38卷 / 03期

关键词：

Double closed loop control; LLC resonant converter; Power electronic transformer (PET); Three-stage;

D O I：

10.7500/AEPS201211028

中图分类号：

学科分类号：

摘要：

A three-stage buck power electronic transformer (PET) topology based on the LLC resonant converter is proposed. In the proposed PET, the high voltage stage on the input side is a diode-clamped three-level rectifier for use in reducing the voltage withstanding grade of switching devices. The isolation stage adopts a three-level LLC series resonant DC-DC converter, the voltage stress of each of whose main switches is half the input voltage. It can realize soft-switching from no-load to full load, which will reduce losses and improve efficiency. The low voltage stage on the output side is a two-level three-phase four-leg inverter to cope with the huge imbalance and nonlinear loads. A control scheme is designed and simulation is performed to verify the performance of the proposed PET. Simulation results show that the proposed PET not only has the basic features of isolation, voltage transformation and energy transmission as does the traditional transformer, but also carries out the power quality regulating function, which can avoid the mutual influence between system and load due to imbalance and distortion. © 2014 State Grid Electric Power Research Institute Press.

引用

页码：41 / 46

页数：5

共 18 条

[1]

Wang Y., Mei S., He G., Characteristics and realization of digitization of primary equipment in substations, Automation of Electric Power Systems, 34, 13, pp. 94-99, (2010)

[2]

Wang D., Mao C., Lu J., Et al., Technical analysis and design concept of DC distribution system, Automation of Electric Power Systems, 37, 8, pp. 82-88, (2013)

[3]

Kang M., Enjeti P.N., Pitel I.J., Analysis and design of electronic transformers for electric power distribution system, IEEE Trans on Power Electronics, 14, 6, pp. 1133-1141, (1999)

[4]

Zhao J., Simulation study of a power electronics transformer with constant output voltage, Automation of Electric Power Systems, 27, 18, pp. 30-33, (2003)

[5]

Gupta R.K., Mohapatra K.K., Mohan N., Novel topologies of power electronic transformers with reduced switch-count, Proceedings of the 2009 Grand Challenges in Modeling and Simulation Conference, pp. 80-87, (2009)

[6]

Ronan E.R., Sudhoff S.D., Glover S.F., Et al., A power electronic-based distribution transformer, IEEE Trans on Power Delivery, 17, 2, pp. 537-543, (2002)

[7]

Lai J.S., Maitra A., Mansoor A., Et al., Multilevel intelligent universal transformer for medium voltage applications, Proceedings of the 40th IEEE IAS Annual Meeting, pp. 1893-1899, (2005)

[8]

Wang D., Mao C., Lu J., Auto-balancing electronic power transformer, Proceedings of the CSEE, 27, 6, pp. 77-83, (2007)

[9]

Liu H., Mao C., Lu J., Et al., Parallel technology of electronic power transformer and conventional power transformer, Automation of Electric Power Systems, 32, 18, pp. 49-54, (2008)

[10]

Zhao T.F., Zeng J., Bhattacharya S., Et al., An average model of solid state transformer for dynamic system simulation, Proceedings of the 2009 IEEE Power and Energy Society General Meeting, pp. 1-8, (2009)

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