基于矢量拟合的直流输电线路建模  

Direct-current Transmission Lines Modeling Based on Vector Fitting

作　　者：韩昆仑[1,2] 杨东睿 代宇 HAN Kun-lun;YANG Dong-rui;DAI Yu(Electrical Engineering College, Guangxi University, Nanning 530004, China;Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China)

机构地区：[1]广西大学电气工程学院,南宁530004 [2]广西大学广西电力系统最优化与节能技术重点实验室,南宁530004

出　　处：《科学技术与工程》2021年第24期10304-10309,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51567003)。

摘　　要：针对线路传播过程中的频变现象,采用矢量拟合法进行频变直流线路建模并对其建模影响因素进行分析。通过对线路进行阻抗频率特性测量,采用矢量拟合法对测量得到的离散点进行有理函数逼近,拟合的带宽为10^(0)~10^(6) Hz,得到考虑频变特性的直流线路数学分析模型,以此为基础建立其3阶线路等效模型,并对线路建模效果的影响进行了深入分析。所建立的线路等效模型与在基于实际参数的PSCAD/EMTDC(power systems computer aided design)软件中建立的直流线路仿真模型进行对比分析,其误差最大处不超过10^(-2),且在故障行波主要传输频段10^(3)~10^(5) Hz内具有很高的精度。其结果验证了该方法具有良好的精确性和适用性。Aiming at the frequency variation phenomenon in the process of line propagation,the vector fitting method was used to model the frequency-varying direct current(DC)line and the influencing factors of the modeling were analyzed.Through the impedance frequency characteristic measurement of the line,the vector fitting method was used to approximate the measured discrete points with rational function,the fitted bandwidth is 10^(0)~10^(6) Hz,then a mathematical analysis model is obtained that considers frequency-varying parameters,based on this,its third-order equivalent circuit model was built,and an in-depth analysis of the influence of related factors on the modeling effect was conducted.The established line equivalent model was compared and analyzed with the DC line simulation model established in power systems computer aided design(PSCAD/EMTDC)software based on actual parameters.the maximum error does not exceed 10^(-2),and it has high accuracy in the main transmission frequency band 10^(3)~10^(5) Hz of the fault traveling wave.The results verify that the proposed method has good accuracy and applicability.

关 键 词：频变参数线路 矢量拟合 线路等效模型 线路建模效果 

分 类 号：TM726[电气工程—电力系统及自动化]