UPFC接入对线路变化量方向元件的影响  

Impact of UPFC on transmission line variation direction elements

作　　者：黄涛[1] 赵青春[1] 谢华[1] 李奔 谈浩[1] HUANG Tao;ZHAO Qingchun;XIE Hua;LI Ben;TAN Hao(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力工程技术》2020年第5期85-91,共7页Electric Power Engineering Technology

基　　金：国家电网有限公司科技项目“500kV统一潮流控制器(UPFC)绝缘优化设计与运行性能评估关键技术研究”。

摘　　要：统一潮流控制器(UPFC)可以实现线路潮流灵活控制,改善系统运行方式,但UPFC的接入改变了线路电压的均匀分布,给继电保护带来了一些问题。文中结合故障后UPFC的控制保护逻辑,研究UPFC注入电压的暂态变化特征,针对不同故障位置分析注入电压变化对变化量方向元件的影响;进而分析UPFC接入对不同变化量方向元件的影响程度,指出当保护安装处位于故障点与UPFC接入点之间时,正序变化量、工频变化量方向元件的灵敏性大幅下降,UPFC本体故障时,正序变化量、工频变化量方向元件可能误判故障方向;最后基于苏州南部电网500 k V UPFC工程实际模型及参数,搭建计及UPFC控保逻辑的实时数字仿真(RTDS)模型,验证所提方法的正确性。Unified power flow controller( UPFC) can realize flexible control of transmission line power flow,and improve system operation mode. However,the access of UPFC changes the uniform distribution of line voltage and brings some problems to relay protection. Based on the fault control and protection logic of UPFC,the transient variation characteristics of UPFC injection voltage are studied firstly. Then,the influence mechanism and degree of injection voltage variation on fault components based directional elements are studied. It is pointed out that when the protection locates between the fault point and the UPFC access point,the sensitivity of the direction element using positive sequence fault component and power frequency fault component can be greatly reduced. When a fault occures in UPFC,the direction elements may misjudge the fault direction. Based on the practical model and parameters of 500 k V UPFC project in southern Suzhou grid,RTDS simulation model contained UPFC control and protection logic is built. The theoretical analysis conclusions are fully verified by RTDS tests.

关 键 词：统一潮流控制器(UPFC) 串联变压器 变化量方向元件 注入电压 灵敏性 

分 类 号：TM77[电气工程—电力系统及自动化]