中国电机工程学报2025，Vol.45Issue(4)：1436-1449,中插17,15.DOI:10.13334/j.0258-8013.pcsee.231642
基于负序电流移置的风电场集电线不对称故障定位方案
Negative-sequence Current Shifting Based Fault Localization for Asymmetric Faults of Collecting Lines in Wind Farms
摘要
Abstract
A large number of wind turbines are connected through collecting lines in wind farms,which makes the fault localization of collecting lines difficult.Therefore,a negative-sequence current shifting based fault localization scheme for asymmetric faults of collecting lines is proposed in this paper.First,the negative-sequence impedance characteristic of wind turbines(WTs)is analyzed from WT fault current,and the negative-sequence modeling of WTs is realized;thus,a shifting strategy can be introduced after the equivalence of negative-sequence networks of wind farms.Then,correlation between fault locations and numerical characteristics of the negative-sequence injection current(NSIC)at boundary nodes of the current shifting domain is analyzed.On this basis,the identification criterion for faulty domains can be constructed,and the identification formula for faulty sub-domains and the calculation formula for fault distance can be derived.Finally,phase characteristics of NSIC are explored,based on which an RMS calculation method for NSIC is presented without phasor measurement required.Verification by PSCAD/EMTDC shows that this proposed scheme is not affected by factors such as fault resistance,fault inception angles,wind speed distribution and wind turbine capacities.It can effectively achieve the fault localization for asymmetric faults of collecting lines.Besides,the required measurement point is very limited,and phasor measurement is not necessary.It is also applicable to collecting lines with line branches.关键词
负序网络/负序电流/电流移置/风电场/集电线/不对称故障/故障定位Key words
negative-sequence network/negative-sequence current/current shifting/wind farm/collecting line/asymmetric fault/fault localization分类
动力与电气工程引用本文复制引用
丁嘉,朱永利,魏源..基于负序电流移置的风电场集电线不对称故障定位方案[J].中国电机工程学报,2025,45(4):1436-1449,中插17,15.基金项目
国家自然科学基金(面上基金项目)(51677072). Project Supported by National Natural Science Foundation of China(General Program)(51677072). （面上基金项目）
