基于谐波分析的母线差动保护非故障相饱和判别方法  

Identification of Non Fault Phase Saturation of Bus Differential Protection Based on Harmonic Analysis

作　　者：曹锦成 张飞云 CAO Jincheng;ZHANG Feiyun(Changzhou Power Supply Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Changzhou 213000,China)

机构地区：[1]国网江苏省电力有限公司常州供电分公司,江苏常州213000

出　　处：《通信电源技术》2022年第6期45-47,共3页Telecom Power Technology

摘　　要：母线在电力系统运行中受到各项因素的影响存在一定的故障隐患,在母线差动保护中存在故障相饱和的情况,不利于母线运行的安全性。基于此,引入谐波分析,提出了基于谐波分析的母线差动保护非故障相饱和判别方法设计。分析母线支路突变电流中的谐波分量,提取母线差动非故障相饱和电流特征;基于谐波分析选取非故障相饱和隶属函数,为非故障相饱和判别提供依据;分析各个支路的有功功率变化,完成母线差动保护非故障相饱和判别。通过实验分析可知,新的判别方法对非故障相饱和判别的时间较短且判别结果的准确率均在95.24%以上,可行性较高。In the operation of power system,the bus is affected by various factors,and there is a certain hidden trouble.There is fault phase saturation in the bus differential protection,which is not conducive to the safety of bus operation.Based on this,the harmonic analysis is introduced,and the design of non fault phase saturation discrimination method for bus differential protection based on harmonic analysis is proposed.The harmonic component in the sudden change current of bus branch is analyzed,and the saturated current characteristics of bus differential non fault phase are extracted.The membership function of non fault phase saturation is selected based on harmonic analysis,which provides a basis for the discrimination of non fault phase saturation.Analyze the change of active power of each branch,and complete the identification of non fault phase saturation of bus differential protection.Through the experimental analysis,it can be seen that the new discrimination method has a short time to distinguish the non fault phase saturation,and the accuracy of the discrimination results are more than 95.24%,which is feasible.

关 键 词：谐波分析 母线运行 差动保护 非故障相饱和 

分 类 号：TM7[电气工程—电力系统及自动化]