直流换相失败引发功率倒向保护策略研究  

Study on Strategy to Avoid Power Converse During Commutation Failure

作　　者：潘尔生[1] 李军[1] 申洪明 韩柳[1] PAN Ersheng LI Jun SHEN Hongming HAN Liu(State Grid Beijing Economic Research Institute, Beijing 102209, China School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China)

机构地区：[1]国网北京经济技术研究院,北京102209 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《华北电力大学学报（自然科学版）》2017年第5期40-47,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司科学技术项目(XT71-16-053)

摘　　要：交直流系统之间相互复杂作用会引发交流线路暂态功率倒向现象。详细分析了交直流互联系统下流入交流系统工频电流相角的变化特点,提出了一种基于本地工频相角信息的防止暂态功率倒向的预防策略;理论分析了直流换相失败对交流系统零序电流的影响,进而提出了一种将零序方向元件与纵联方向保护判据相结合的防止暂态功率倒向的预防措施。最后基于PSCAD/EMTDC仿真结果验证了防范措施的有效性。The transient power converse may occur in AC line because of the complicated interaction between AC and DC system. Detailed analysis is presented on the characteristics of the phase change of the power frequency current flowing into the AC system in AC/DC interconnected network. Then,a preventive method for avoiding transient power converse based on the information of local primary phase angle is proposed. The effect of commutation failure on AC zero-sequence current is analyzed from theoretical perspective. And a countermeasure is also presented on the basis of the zero-sequence direction component and criterion of directional comparison pilot protection. At last,the results of PSCAD/EMTDC simulation prove the validity of the countermeasures.

关 键 词：换相失败 功率倒向 基波相角 零序方向元件 

分 类 号：TM773[电气工程—电力系统及自动化]