许烽,李继红,朱承治,章姝俊,童凯
XU Feng,LI Jihong,ZHU Chengzhi,ZHANG Shujun,TONG Kai

• 1:国网浙江省电力公司电力科学研究院
• 2:国网浙江省电力公司

摘要(Abstract)：

直流断路器安装于直流电网后会对直流系统的过电压特性产生影响,尤其是直流断路器相邻位置的绝缘特性需要仔细校核。在分析了混合式直流断路器工作原理的基础上,针对相邻位置安装避雷器和不安装避雷器2种方案分别进行了过电压机理研究和仿真分析。为进一步降低直流单极接地故障下直流断路器分断可能造成的较高过电压,基于电压判据提出了一种缓解直流断路器相邻节点过电压水平的保护策略。通过建立三端直流输电PSCAD/EMTDC仿真模型,验证了缓解过电压水平的保护策略的可行性和有效性。
DC circuit breakers installed in the DC power grid will have an impact on the overvoltage characteristics of the DC system. The insulation characteristics of the locations adjacent to the DC circuit breakers need to be carefully checked particularly. Based on the operational principle analysis of the hybrid DC circuit breakers, the overvoltage mechanism research and simulation analysis are carried out for the two schemes,one is installing arrester at the adjacent location and the other is not. Under the DC monopole grounding fault, in order to further reduce the overvoltage during the breaking of the DC circuit breaker, a protection strategy for the mitigation of the adjacent node overvoltage is proposed based on voltage criterion. Finally,through simulation of a three-terminal DC system in PSCAD/EMTDC, feasibility and validity of the protection strategy for over-voltage mitigation are verified.

关键词(KeyWords)： 直流电网;直流断路器;避雷器;保护策略;机理研究
DC gird;DC circuit breaker;arrester;protection strategy;mechanism study

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司科技项目(5211DS16000C)

作者(Author): 许烽,李继红,朱承治,章姝俊,童凯
XU Feng,LI Jihong,ZHU Chengzhi,ZHANG Shujun,TONG Kai

DOI: 10.19585/j.zjdl.201709003

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