电力系统保护与控制2018，Vol.46Issue(4)：28-34,7.DOI:10.7667/PSPC170149
一种基于电流自构参考量的电流方向纵联保护
A new pilot direction protection based on self-constructing reference current
摘要
Abstract
The protection based on zero sequence direction or negative sequence direction plays important roles in power system relay protection. But in the condition of a high resistance grounded system or PT disconnection, the voltage at some of measuring points is small which will affect the discrimination of directional element. In order to solve these problems, this paper brings forward a new criterion based on zero sequence current or negative sequence current to build zero sequence directional reference or negative sequence directional reference. And then a pilot directional protection is constructed by comparing two-terminal direction results of a line. After the asymmetrical faults occurs in system, it utilizes information-integrated processing of zero/negative sequence current like differential method and reverse method to acquire the current reference direction of sending side and receiving side in the same direction, building a new criterion based on the comparison of zero/negative sequence current and reference direction. This method does not need voltage information that can greatly reduce the communication traffic of the protection, and is immune to different fault initial angle and large ground resistance. Thus it can be widely used in wide-area protection system. Simulation results show that the direction criterion is reliable.关键词
零序方向/负序方向/参考量/纵联方向Key words
zero sequence current direction/negative sequence current direction/reference value/pilot direction引用本文复制引用
李振兴,王玲,王欣,李振华,翁汉琍..一种基于电流自构参考量的电流方向纵联保护[J].电力系统保护与控制,2018,46(4):28-34,7.基金项目
国家自然科学基金项目(51607106) （51607106）
湖北省教育厅科学技术研究计划重点项目(Z2017037)This work is supported by National Natural Science Foundation of China (No. 51607106) and Key Project of Science and Technology Research Program of Hubei Provincial Education Department (No. Z2017037). （Z2017037）
