周廷冬;徐永海;吕晓慧;

• 1:新能源电力系统国家重点实验室(华北电力大学)

摘要(Abstract)：

对基于模块化多电平换流器(modular multilevel converter,MMC)的配电网电力电子变压器在发生交流输入侧单相接地故障、中压直流侧单极接地故障、低压直流侧单极接地故障以及交流输出侧单相接地故障下的故障特性进行了分析。参考MMC-UPFC、MMC-HVDC以及低压交流配电网现有的接地方案,提出适用于配电网电力电子变压器的接地方式:交流输入侧接地变压器接地、交流输入侧大电抗接地、中压直流侧大电阻接地、低压直流侧电容中点接地以及交流输出侧接地变压器接地。对上述接地故障在不同接地方式下的故障特性进行了对比分析,并通过PSCAD仿真平台对所分析接地方式及故障特性进行了仿真验证。最后,基于故障特性分析结果并考虑目前的制造技术,提出了输入侧、输出侧分别采用接地变压器接地作为目前配电网电力电子变压器接地方式的建议。

关键词(KeyWords)： 电力电子变压器;接地故障;接地设计;故障特性

Abstract:

Keywords:

基金项目(Foundation): 北京市自然科学基金资助项目(3172036)~~

作者(Author): 周廷冬;徐永海;吕晓慧;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.0696

参考文献(References)：

• [1]陈启超,王建赜,纪延超.基于LLC谐振变换器的电力电子变压器[J].电力系统自动化,2014,38(3):41-46.Chen Qichao,Wang Jianze,Ji Yanchao.Power electronic transformer based on LLC resonant converter[J].Automation of Electric Power System,2014,38(3):41-46(in Chinese).
• [2]Briz F,Lopez M,Rodriguez A.Modular power electronic transformers modular multilevel converter versus cascaded H-bridge solutions[J].IEEE Industrial Electronics Magazine,2017,10(4):6-19.
• [3]韩继业,李勇,曹一家,等.基于模块化多电平型电力电子变压器的新型直流微网架构及其控制策略[J].电网技术,2016,40(3):733-740.Han Jiye,Li Yong,Cao Yijia,et al.A new DC microgrid architecture based on MMC-SST and its control strategy[J].Power System Technology,2016,40(3):733-740(in Chinese).
• [4]Wang X,Liu J,Ouyang S,et al.Control and experiment of an H-bridge-based three-phase three-stage modular power electronic transformer[J].IEEE Transactions on Power Electronics,2016,31(3):2002-2011.
• [5]Madhusoodhanan S,Tripathi A,Patel D,et al.Solid-state transformer and MV grid tie applications enabled by 15kV Si C IGBTs and 10kV Si C MOSFETs based multilevel converters[J].IEEE Transactions on Industry Applications,2015,51(4):3343-3360.
• [6]Gu C,Zheng Z,Xu L,et al.Modeling and control of a multiport power electronic transformer(PET)for electric traction applications[J].IEEE Transactions on Power Electronics,2015,31(2):1.
• [7]兰征,涂春鸣,肖凡,等.电力电子变压器对交直流混合微网功率控制的研究[J].电工技术学报,2015,30(23):50-57.Lan Zheng,Tu Chunming,Xiao Fan,et al.The power control of power electronic transformer in hybrid AC-DC microgrid[J].Transactions of China Electrotechnical Society,2015,30(23):50-57(in Chinese).
• [8]张明锐,王之馨,黎娜.下垂控制在基于固态变压器的高压微电网中的应用[J].电力系统自动化,2012,30(14):186-192.Zhang Mingrui,Wang Zhixin,Li Na.Application of droop control in high-voltage microgrid based on solid state transformer[J].Automation of Electric Power Systems,2012,30(14):186-192(in Chinese).
• [9]白杰,张永胜,梁晖.电力电子变压器在改善电能质量中的应用[C]//2013年中国电机工程学会年会论文集.成都:2013年中国电机工程学会年会,2013:7.
• [10]廖国虎,袁旭峰,邱国跃.配电网电力电子变压器仿真研究[J].电测与仪表,2014(17):35-41.Liao Guohu,Yuan Xufeng,Qiu Guoyue.Research on the simulation of the power electronic transformer in the distribution network[J].Electrical Measurement&Instrumentation,2014(17):35-41(in Chinese).
• [11]Sang Z,Mao C,Lu J,et al.Analysis and simulation of fault characteristics of power switch failures in distribution electronic power transformers[J].Energies,2013,6(8):4246-4268.
• [12]Guillod T,Krismer F,Farber R,et al.Protection of MV/LV solid-state transformers in the distribution grid[C]//IECON 2015 Conference of the IEEE Industrial Electronics Society.Yokohama,Japan:2015Conference of the IEEE Industrial Electronics Society,2015:3531-3538.
• [13]崔福博,郭剑波,荆平,等.MMC-UPFC接地设计及其站内故障特性分析[J].中国电机工程学报,2015,35(7):1628-1636.Cui Fubo,Guo Jianbo,Jing Ping,et al.The grounding design and internal fault characteristic of MMC-UPFC[J].Proceedings of the CSEE,2015,35(7):1628-1636(in Chinese).
• [14]邓旭,沈扬,王东举,等.基于模块化多电平换流器的多端柔性直流系统接地方式[J].电力建设,2014,35(3):24-30.Deng Xu,Shen Yang,Wang Dongju,et al.Grounding methods of multi-terminal VSC-HVDC system based onmodular multi-level converter[J].Electric Power Construction,2014,35(3):24-30(in Chinese).
• [15]李子欣,王平,楚遵方,等.面向中高压智能配电网的电力电子变压器研究[J].电网技术,2013,37(9):2592-2601.Li Zixin,Wang Ping,Chu Zunfang,et al.Research on medium-and high-voltage smart distribution grid oriented power electronic transformer[J].Power System Technology,2013,37(9):2592-2601(in Chinese).
• [16]戴志辉,葛红波,严思齐,等.柔性直流配电网接地方式对故障特性的影响分析[J].电网技术,2017,41(7):2353-2362.Dai Zhihui,Ge Hongbo,Yan Siqi,et al.Effects of grounding mode on fault characteristics in flexible DC distribution system[J].Power System Technology,2017,41(7):2353-2362(in Chinese).
• [17]GB 50052—2009供配电系统设计规范[S].北京:国家质检总局,2009.
• [18]杨海倩,王玮,荆龙,等.MMC-HVDC系统直流侧故障暂态特性分析[J].电网技术,2016,40(1):40-46.Yang Haiqian,Wang Wei,Jing Long,et al.Analysis on transient characteristic of DC transmission line fault in MMC based HVDC transmission system[J].Power System Technology,2016,40(1):40-46(in Chinese).
• [19]文玉玲,丁碧薇,宋占党,等.配电网中性点最佳接地电阻值选择[J].电气自动化,2014,38(6):83-85,88.Wen Yuling,Ding Biwei,Song Zhandang,et al.Choosing the best grounding resistance for the neutral point of the power distribution network[J].Power System&Automation,2014,38(6):83-85,88(in Chinese).