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MMC-HVDC输电网用高压DC/DC变换器隔离需求探讨
引用本文:王新颖,汤广福,魏晓光,庞辉.MMC-HVDC输电网用高压DC/DC变换器隔离需求探讨[J].电力系统自动化,2017,41(8):172-178.
作者姓名:王新颖  汤广福  魏晓光  庞辉
作者单位:新能源电力系统国家重点实验室(华北电力大学), 北京市 102206; 大功率电力电子北京重点实验室(全球能源互联网研究院), 北京市 102211,大功率电力电子北京重点实验室(全球能源互联网研究院), 北京市 102211,大功率电力电子北京重点实验室(全球能源互联网研究院), 北京市 102211,大功率电力电子北京重点实验室(全球能源互联网研究院), 北京市 102211
摘    要:高压DC/DC变换器是构建直流电网的关键装备之一,其技术需求分析是其电气拓扑设计和系统应用研究的前提。文中着重围绕基于模块化多电平换流器的高压直流(MMC-HVDC)输电网用高压DC/DC变换器电气隔离功能的选择和故障隔离要求等问题展开探讨。从DC/DC变换器故障特性、系统绝缘造价和可靠性角度分析了不同接地方式的直流系统中DC/DC变换器的电气隔离需求,分析结果表明:对称单极系统中DC/DC变换器宜具备电气隔离功能,而双极系统宜采用非电气隔离拓扑。此外,从DC/DC变换器外部故障和内部故障两个角度对DC/DC变换器的故障隔离需求进行了研究。最后,通过仿真验证了隔离需求分析的正确性。

关 键 词:直流电网  DC/DC变换器  技术需求  故障隔离  电气隔离
收稿时间:2016/8/5 0:00:00
修稿时间:2017/2/19 0:00:00

Discussion on Isolation Requirement of High Voltage DC/DC Converter for MMC-HVDC Transmission Systems
WANG Xinying,TANG Guangfu,WEI Xiaoguang and PANG Hui.Discussion on Isolation Requirement of High Voltage DC/DC Converter for MMC-HVDC Transmission Systems[J].Automation of Electric Power Systems,2017,41(8):172-178.
Authors:WANG Xinying  TANG Guangfu  WEI Xiaoguang and PANG Hui
Affiliation:State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206, China; Beijing Key Laboratory of High Power Electronics(Global Energy Interconnection Research Institute), Beijing 102211, China,Beijing Key Laboratory of High Power Electronics(Global Energy Interconnection Research Institute), Beijing 102211, China,Beijing Key Laboratory of High Power Electronics(Global Energy Interconnection Research Institute), Beijing 102211, China and Beijing Key Laboratory of High Power Electronics(Global Energy Interconnection Research Institute), Beijing 102211, China
Abstract:The DC/DC converter is one of the key devices of DC grid. The technological requirement analysis of the DC/DC converter is the premise of its topology design and application research. The selection of electrical isolation function and the requirement of fault blocking of DC/DC converters for modular multilevel converter based high-voltage direct current(MMC-HVDC)transmission systems are discussed. The electrical isolation requirements of DC/DC converter under different grounding systems are analyzed in terms of fault characteristics, insulation cost and system reliability. The analysis results show that electrical isolation is needed under symmetric monopole system and non-electrical isolation is better for bipolar system. Besides, DC/DC converter fault blocking demand is carefully investigated in terms of extermal and internal faults of the DC/DC converter. Finally, the analysis of electrical isolation and fault blocking demand of the DC/DC converter are verified through simulations.
Keywords:DC grid  DC/DC converter  technical requirements  fault blocking  electrical isolation
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