基于改进换相面积的直流输电换相失败判别方法  

Commutation failure detective method based on improved commutation area in HVDC

作　　者：刘济豪[1] 郭春义[1] 刘文静[1] 许韦华 阳岳希 赵成勇[1] 李丹[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]国网智能电网研究院,北京102200

出　　处：《华北电力大学学报（自然科学版）》2014年第1期15-21,共7页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司大电网重大专项资助项目(SGCC-MPLG004-2012)

摘　　要：对换相电压时间面积判据进行了改进,在判断换相失败时考虑到直流电流的波动,得到改进换相面积判据,该判据的推导过程更接近工程实际。在仿真软件PSCAD/EMTDC下搭建了±800 kV传统直流输电仿真系统LCC-HVDC。分别采用改进前后的换相面积作为换相失败的判据,搭建了换相失败的判断程序并用于判断LCC-HVDC仿真系统中由于交流侧故障导致的换相失败。仿真结果表明,改进换相面积判据可以更加准确地判断换相失败。最后,根据仿真结果,进一步分析了故障时刻对换相失败的影响。Commutation voltage-time area judgment is improved in order to take direct current into consideration and improved commutation area judgment is obtained. ＋ 800kV LCC-HVDC simulation system is built under PSCAD/EMT- DC, as well as commutation failure judging program based on improved and unimproved commutation area judgment. Commutation failure judging program is applied to detect commutation failure in LCC-HVDC simulation system, which is caused by AC system fault. Simulation result shows that improved commutation area judgment, compared with unim- proved one, judges commutation failure more accurate. Besides, effect of fault time on commutation failure is also ana- lyzed in this paper.

关 键 词：换相失败 换相电压时间面积 故障时刻 

分 类 号：TM771[电气工程—电力系统及自动化] TM71