基于双电压互感器的DPFC线路距离保护新方法  

Novel Distance Protection Method for DPFC Lines Based on Dual Voltage Transformers

作　　者：曹建伟 黄志华 张新雨 刘莹 张磊 李斌[2] CAO Jianwei;HUANG Zhihua;ZHANG Xinyu;LIU Ying;ZHANG Lei;LI Bin(Huzhou Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd,Huzhou 313000,China;Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Tianjin 300072,China)

机构地区：[1]国网浙江省电力有限公司湖州供电公司,湖州313000 [2]智能电网教育部重点实验室(天津大学),天津300072

出　　处：《电力系统及其自动化学报》2022年第9期1-8,共8页Proceedings of the CSU-EPSA

基　　金：国网湖州供电公司多元融合高弹性电网研究与评估支持服务工作项目(SGZJHU00DKWT2000641)。

摘　　要：为解决分布式潮流控制器接入输电线路后,单一电压互感器与线路电流互感器构成的保护元件无法兼顾故障方向与区内外故障正确判别的问题,提出分布式潮流控制器接入线路距离保护的新方法。此方法在原有单一电压互感器、单一电流互感器的基础上再增加1个电压互感器构成保护元件,得到母线侧与线路侧两处的电气量,利用母线侧的电压互感器进行故障方向判别,线路侧的电压互感器进行区内外故障识别。PSCAD/EMTDC仿真验证表明,此方法可以正确对故障方向和区内外故障进行判别。After a distributed power flow controller(DPFC)is connected to the transmission line,the protection element composed of one single voltage transformer and one single line current transformer cannot simultaneously identify the fault direction and internal/external fault accurately.To solve this problem,a novel distance protection method for lines connected with a DPFC is proposed.On the basis of the original single voltage transformer and single current transformer,a voltage transformer is added to form a protection element,thus obtaining the electrical quantities on both the bus side and the line side.The fault direction is identified by the voltage transformer on the bus side,and the internal and external faults are identified by the voltage transformer on the line side.The simulation results based on PSCAD/EMTDC show that the proposed method can correctly identify the fault direction as well as the internal and external faults.

关 键 词：分布式潮流控制器 电压互感器 距离保护 方向判别 区内外故障识别 

分 类 号：TM72[电气工程—电力系统及自动化]