特高压直流输电工程750 kV交流滤波电容器保护方案研究  

Study on Protection Scheme of 750 kV AC Filter Capacitor for UHVDC Transmission Project

作　　者：杨结春 秦华忠 黄有祥 周春红 蒋利军 梁琮 卢有盟 YANG Jiechun;QIN Huazhong;HUANG Youxiang;ZHOU Chunhong;JIANG Lijun;LIANG Cong;LU Youmeng(Guilin Power Capacitor Co., Ltd., Guangxi Guilin 541004, China)

机构地区：[1]桂林电力电容器有限责任公司

出　　处：《电力电容器与无功补偿》2019年第3期1-4,共4页Power Capacitor & Reactive Power Compensation

基　　金：广西重点研发计划项目(桂科AB17129004)

摘　　要：换流站交流滤波电容器组的额定电压和额定容量比以往工程大幅度提高,对应的电容器单元串联数、台数和元件数更多。若按 500 kV 交流滤波电容器组的不平衡保护方案,不能满足高可靠性的要求,因此需要重新研究 750 kV 交流滤波电容器组电容器单元内部故障保护的不平衡电流保护。通过对 750 kV 交流滤波电容器组单桥差不平衡电流保护和双桥差不平衡电流保护的两种方案进行对比分析。结果认为:采用双桥差不平衡电流保护,做为 750 kV 交流滤波电容器组电容器单元内部故障保护更加安全可靠。Both rated voltage and rated capacity of AC filter back of converter station has improved greatly over previous projects and the quantity of corresponding series numbers,unit numbers and component numbers are more than before. The use of unbalance protection scheme of 500 kV AC filter capacitor bank cannot meet high reliability requirement,therefore the restudy of the unbalance current protection of internal fault protection for the capacitor unit of 750 kV AC filter capacitor bank is necessary. Both such schemes as single and double bridge differential unbalance current protections of 750 kV AC filter capacitor bank is compared and analyzed. It is shown by the result that the use of double bridge differential unbalance current protection,as the protection of internal fault of capacitor unit of 750 kV AC filter capacitor bank is more safe and reliable.

关 键 词：特高压直流输电 750 kV 交流滤波电容器组 双桥差不平衡电流保护 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM53