2021年 第7卷 第8期
《工程（英文）》 >> 2021年 第7卷 第8期 doi: 10.1016/j.eng.2021.05.002
混合多端直流输电系统保护方法研究
a State Key Laboratory of Smart Grid Protection and Control, Nari Group Corporation, Nanjing 211106, China
b Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
c College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
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摘要
近年来，混合多端直流输电系统快速发展。但是，在混合直流系统中应用的电压源换流器（voltage-source converter, VSC）出口不再需要直流滤波器。此外，考虑到其直流故障电流可被换流器自身有效抑制，直流线路两端也不再需要安装限流电抗器。这意味着线路两端边界缺失，导致应用于常规高压直流输电（line commutated converter based high-voltage direct current, LCC-HVDC）系统和柔性直流（VSC-HVDC）电网的单端量保护均无法适用于混合多端直流输电系统。为此，本文提出了一种适用于混合多端直流输电系统的单端量保护新原理，该方法主要基于暂态信息和主动注入思想实现故障辨识。与应用于LCCHVDC和VSC-HVDC系统的单端量保护相比，所提方法无需依赖线路两端的边界元件，因此更加适用于混合多端直流系统。大量的仿真算例充分验证了所提方法的可行性和优越性。
关键词
混合多端直流输电系统 ; 单端量保护 ; 暂态量信息 ; 主动注入
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