涌流对换流器桥差保护异常动作的影响分析  

Analysis of the Influence of Inrush Current on the Bridge Differential Protection

作　　者：刘雷 李昊威 王胜 李雪华 陈波[1] 于楠[1] LIU Lei;LI Hao-wei;WANG Sheng;LI Xue-hua;CHEN Bo;YU Nan(Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University ,Yichang 443002, China;College of Electrical Engineering and New Energy, China Three Gorges University ,Yichang 443002, China;Huaneng Jingmen Thermal Power Co. LTD , Jingmen 448002 ,China)

机构地区：[1]梯级水电站运行与控制湖北省重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]华能荆门热电有限责任公司,湖北荆门448002

出　　处：《电力学报》2018年第3期245-250,257,共7页Journal of Electric Power

摘　　要：针对高压直流输电工程在运行中多次发生的换流站换流器桥差保护异常动作,首先对桥差保护原理进行简述,然后分析励磁涌流导致换流变两侧电流互感器饱和,引起桥差保护误动原因。利用实际参数,基于PSCAD/EMTDC仿真软件,建立高压直流输电桥差保护模型,对空载合闸时换流器桥差保护误动进行仿真验证。最后讨论了防止桥差保护误动的解决方案。Aiming at the abnormal action situation on converter bridge difference protection of converter in HVDC transmission project,this paper briefly introduces the principle of bridge protection,and then analyzes the inrush current cause to saturation of current transformer on both sides of converter transformer,which in turn causes the reasons for the mal-operation of bridge difference protection.Based on the actual parameters,the HVDC bridge differential protection model is established in PSCAD/EMTDC simulation software.to simulate the differential protection of the bridge differential protection during no-load closing.Finally,the solution to prevent the bridge differential protection is discussed.

关 键 词：换流器 励磁涌流 桥差保护误动作 TA饱和 

分 类 号：TM46[电气工程—电器]