应用于低频电力系统的母线差动保护判据研究  

Research on bus differential protection criterion applied to low frequency power system

作　　者：丁杰[1,2] 吕航[1,2] 王风光[1,2] 龚啸[1,2] 赵国勇 DING Jie;LÜHang;WANG Fengguang;GONG Xiao;ZHAO Guoyong(NR Electric Co.,Ltd,Nanjing 211102;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106)

机构地区：[1]南京南瑞继保电气有限公司,南京211102 [2]南瑞集团公司(国网电力科学研究院),南京211106

出　　处：《电气技术》2023年第10期44-50,共7页Electrical Engineering

摘　　要：随着清洁能源的快速发展,新能源结合柔性低频交流输电成为新的发展方向,为满足低频交流输变电系统的工程应用需求,常规交流继电保护须开展适应性研究。本文从母线保护出发,探讨现有母线保护原理,分析不同采样间隔对采样值积算法结果的影响。针对20Hz低频系统,基于采样值积算法提出一种低频母线差动保护新判据,利用采样值积算法快速计算故障特征量,并结合瞬时值判据保证故障判断的可靠性。测试结果表明,基于新判据的低频母线保护能够满足现有技术规范对母线保护的可靠性及速动性要求,母线区内故障时整组动作时间小于20ms,母线区外故障时低频母线保护可靠不动作。With the rapid development of clean energy,new energy combined with flexible low frequency AC power transmission has become a new development direction.In order to meet the engineering application requirements of low frequency AC power system,adaptability research must be carried out for conventional AC relay protection.Starting from the busbar protection,this paper discusses the existing busbar protection principle,and analyzes the influence of different sampling intervals on the result of sample value product algorithm.For 20Hz low frequency power system,a new criterion for low frequency bus differential protection is proposed based on the sample value product algorithm.The fault characteristic quantity is quickly calculated based on sample value product algorithm,and the reliability of fault judgment is guaranteed by combining with instantaneous value criterion.The simulation results show that the low frequency busbar protection based on the new criterion can meet the requirements of the existing technical specifications for the reliability and speed of busbar protection.The whole fault clear time is less than 20ms for faults within the busbar area,and the low frequency busbar protection does not operate for faults outside the busbar area.

关 键 词：新能源 低频电力系统 母线保护 采样值积算法 速动性 

分 类 号：TM773[电气工程—电力系统及自动化]