基于相量–时间三维曲线特性的同塔双回输电线路参数自适应故障测距频域法  

Frequency-domain Fault Location Method With Adaptive Line Parameters for Double-circuit Lines on Same Tower Based on Phasor-time Curve Characteristics

作　　者：梁远升[1] 丁佳彦 李海锋[1] 王钢[1] 张子鸿 陈娟 LIANG Yuansheng;DING Jiayan;LI Haifeng;WANG Gang;ZHANG Zihong;CHEN Juan(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,Guangdong Province,China;Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528000,Guangdong Province,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]广东电网有限责任公司佛山供电局,广东省佛山市528000

出　　处：《中国电机工程学报》2023年第20期7856-7867,共12页Proceedings of the CSEE

基　　金：广东省基础与应用基础研究基金自然科学基金项目(2021A1515010631)。

摘　　要：考虑到故障后可用数据窗缩短使故障暂态分量影响难以完全消除,以及线路参数在实际运行中的不确定变化,提出一种基于相量–时间三维曲线特性的同塔双回输电线路参数自适应故障测距频域法。利用随数据窗推移的离散傅里叶变换(discrete Fourier transform,DFT)输出的相量–时间特征,保留衰减直流产生的衰减偏置相量,构建补偿电压差值的相量–时间三维曲线观测模型,曲线特征在线路参数准确与偏离、观测点落于与偏离故障点时均存在显著差异。基于这种特征差异,采用非线性最小二乘法对补偿电压差时间序列样本进行曲线拟合,并利用拟合优度指标评估样本分布与准确参数估计和故障距离的三维曲线的相符程度,将线路参数估计与故障测距问题转化为拟合优度的优化问题。仿真验证表明,所提故障测距算法具有较高的测距精度。Considering that the influence of fault transient component is difficult to be eliminated due to the shortening of available data window after fault,and the uncertain changes of line parameters,a frequency-domain fault location method with adaptive line parameters for double-circuit lines on same tower based on phasor-time curve characteristics is proposed in this paper.By utilizing the phasor-time characteristics of the discrete Fourier transform(DFT)outputs and retaining the decaying DC offset phasor generated by the decaying DC component,the three-dimensional compensating voltage difference phasor-time curve can be obtained.Based on the characteristic difference of the curve when the line parameters are accurate and deviated,and the observation point falls on and deviates from the fault point,the nonlinear least square method is used to fit the compensating voltage difference sample series,and the goodness of fit is used to evaluate the consistency of the sample distribution characteristic and the curve characteristics with accurate line parameters or at the fault point.Then the problem of line parameter estimation or fault location can be transformed into an optimization problem of the goodness of fit.Simulation results show that the proposed fault location algorithm has high accuracy.

关 键 词：同塔双回线 故障测距 线路参数自适应 衰减直流分量 补偿电压 

分 类 号：TM77[电气工程—电力系统及自动化]