Voltage Sags Mitigation with Feeder Fast-tripping Overcurrent Protection

摘要：

Since voltage sags are mainly caused by distribution system faults,it is rational to design the sag mitigation schemes from the point of relay protection performance.This paper evaluates the voltage sag mitigation capability of definite-time overcurrent protection by introducing the protection characteristics into the CBEMA curve and analyzing the essence from the point of energy balance.The result proves the validity of sag mitigation with overcurrent protection.It is also showed that the only effective improvement measure is the available extension of the instantaneous relay protection zone.To achieve it,a nonselective fast-tripping overcurrent scheme is proposed.Cost analysis and case simulations demonstrate that the transient voltage quality can be improved considerably without any cost increases using the novel scheme.

关键词： Distribution system:Voltage sags mitigation Overcurrent protection:Auto-recolse

作者: Bin Wang Xinzhou Dong Zhencun Pan

作者单位: Dept.of Electrical Engineering Tsinghua University Beijing,China School of Electrical Engineering Shandong University Jinan,Shandong,China

会议类型: 国际会议

会议名称: 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

会议地点: 威海

会议语种:英文

页码: 67-72

在线出版日期: 2011-07-06（万方平台首次上网日期，不代表论文的发表时间）