高电压技术2025，Vol.51Issue(2)：520-529,10.DOI:10.13336/j.1003-6520.hve.20241021
基于电流相位的多端口光伏直流汇集系统故障区段辨识方法
Fault Zone Identification Method for Multi-port Photovoltaic DC Collection System Based on Current Phase
摘要
Abstract
A multi-port PV DC boost collection grid-connected system has many branches,short lines,fast fault devel-opment and high current peak,and it is difficult to identify the fault section quickly and reliably.In order to realize rapid fault isolation and recovery of the system,an inter-electrode fault segment identification method based on the relative phase of high frequency current is proposed.Firstly,the transient equivalent network is constructed after faults in different segments,the equivalent parallel capacitor and current limiting inductor are used to simplify the equivalent network,and the correlation characteristics between high frequency currents are obtained.Then,the correlation is quantified as phase difference distribution,and the fault section identification criterion is constructed based on the phase difference distribu-tion between the collector branch and the sending line.The identification result is output in the form of logical quantity.Finally,the simulation results show that the method can be adopted to reliably select the line within 2ms after the fault at the earliest,and has strong resistance to noise,transition resistance,and distributed capacitance.The method is simple and practical,and has a certain engineering application value.关键词
直流并网/相关性/相对相位/故障分析/大型光伏电站/故障区段辨识Key words
DC grid-connected/correlation/relative phase/fault analysis/large-scale photovoltaic power station/fault zone identification引用本文复制引用
和敬涵,陈想,李猛,杜晓通,闫诗琪..基于电流相位的多端口光伏直流汇集系统故障区段辨识方法[J].高电压技术,2025,51(2):520-529,10.基金项目
国家自然科学基金(U23B6007).Project supported by National Natural Science Foundation of China(U23B6007). （U23B6007）
