强干扰环境下三相不对称线路参数综合抗干扰测量方法  

Comprehensive anti-interference measurement method for three-phase asymmetric transmission line parameters in strong interference environment

作　　者：李洪江 杨永昆 卢泓冶 牟洪江 胡志坚[2] LI Hongjiang;YANG Yongkun;LU Hongye;MOU Hongjiang;HU Zhijian(Yunnan Power Grid Co.,Ltd.,Kunming 650011,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]云南电网有限责任公司,云南昆明650011 [2]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2024年第12期1750-1758,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51977156);云南电网有限责任公司科技项目(编号:0572002021030304XM00003)。

摘　　要：为提高强干扰环境下输电线路参数测量的精度,提出了一种三相不对称线路电容参数和阻抗参数的综合抗干扰测量方法。首先在工频测试源下,利用被测线路的双端电压和电流的三次谐波分量测量线路的电容参数,以避开工频干扰;然后考虑电容电流的影响对线路的阻抗测量模型进行修正;最后在异频测试源下,利用所测电压和电流的异频增量测量线路的阻抗参数,从而同时有效抑制线路存在的工频和异频干扰。仿真结果表明,相较于现有方法,所提方法在强干扰环境下能有效提高三相不对称线路参数的测量精度。In order to improve the measurement accuracy of transmission line parameters in strong interference environment,a comprehensive anti-interference measurement method for capacitance parameters and impedance parameters of three-phase asymmetric transmission line is proposed.First,in the power-frequency voltage source,the capacitance parameters are measured by using the third harmonic components of the voltage and current measured in two ends of the transmission line to avoid power frequency interference.Second,the influence of the capacitance current is considered to correct the impedance measurement model of the line.Finally,in the non-power frequency voltage source,the non-power frequency increments of the measured voltage and current are used to measure the impedance parameters to simultaneously suppress the power frequency and non-power frequency interferences existing in the transmission line effectively.The simulation results show that the proposed method can effectively improve the parameter measurement accuracy of threephase asymmetric line in the strong interference environment compared with the existing methods.

关 键 词：三相不对称线路 电容参数 阻抗参数 综合抗干扰 谐波分量 异频增量 

分 类 号：TM934[电气工程—电力电子与电力传动]