并联多端直流输电金属回线站内接地故障隔离策略研究  

Research on Station Grounding Fault Isolation Strategy in Metallic Return Mode of Parallel Multi-Terminal HVDC Transmission

作　　者：李广宇[1] 甘宗跃[2] 杨建明[1] 彭茂兰 LI Guang-yu;GAN Zong-yue;YANG Jian-ming;PENG Mao-lan(NR Electric Co.,Ltd,Nanjing 211102,China;China Southern Power Grid EHV Power Transmission Company,Guangzhou 510670,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102 [2]中国南方电网超高压输电公司,广东广州510670

出　　处：《电工电气》2021年第2期34-39,57,共7页Electrotechnics Electric

摘　　要：结合乌东德并联三端特高压直流输电工程实例,分析了针对金属回线站内接地故障所配置的极保护逻辑,基于这些保护逻辑,研究了并联多端直流系统在发生金属回线站内接地故障后,在两端、三端运行方式下,针对不同换流站所需要采用的故障隔离策略,并据此提出了N端运行方式的故障隔离策略。通过仿真试验测试,该策略在正确隔离故障的同时,可以最大程度地减少停运换流站的数量,从而保持系统尽可能多的功率传输。Based on the Wudongde parallel three-terminal UHVDC transmission project,this paper analyzes the pole protection logic for station grounding fault in metallic return.Based on these protection logics,the fault isolation strategy for parallel multi-terminal DC system in two-terminal or three-terminal operation mode is analyzed after station grounding fault occurs in metallic return,and the fault isolation strategy for N-terminal operation mode is proposed accordingly.Through the simulation test,this strategy can minimize the number of stopped stations while correctly isolating faults,so as to maintain the system power transmission as much as possible.

关 键 词：并联多端直流输电 金属回线 极保护 故障隔离策略 

分 类 号：TM773[电气工程—电力系统及自动化]