发电技术2024，Vol.45Issue(4)：753-764,12.DOI:10.12096/j.2096-4528.pgt.23078
基于正序突变量相轨迹辨识的可再生能源配电网电流保护
Renewable Energy Distribution Network Overcurrent Protection Based on Positive-Sequence Sudden-Change Component Locus Identification
摘要
Abstract
[Objectives]With the widespread integration of renewable energy,the uncertainty of power flow in distribution networks with neutral points grounded through small resistors has made the setting of traditional three-stage current protection increasingly complex,and reduced its sensitivity and reliability.To solve the above issues,a new type of current protection based on positive sequence sudden-change variable current phasor trajectory identification was proposed.[Methods]Firstly,the magnitude and distribution characteristics of the positive sequence sudden-change variable current upstream and downstream of the fault point were analyzed.Secondly,using the affinity clustering algorithm,the defined"main fault path"based on the clustering results was identified.Finally,a novel searching method was proposed to identify the source of the positive sequence sudden-change variable,which was the last level feeder located on the main fault path,as the faulted feeder.[Results]Simulation research based on PSCAD shows that the proposed protection method can adapt to various fault conditions,is immune to the integration of renewable energy,and has high sensitivity and reliability.[Conclusions]The research findings are helpful to enhance the operational safety of distribution networks with neutral points grounded through small resistors,and improve the efficiency of fault detection.关键词
可再生能源/配电网/继电保护/正序突变量/亲和聚类算法Key words
renewable energy/distribution network/relay protection/positive-sequence sudden-change component/affinity clustering algorithm分类
能源科技引用本文复制引用
王伟杰,曾鑫洁,徐远途,李书仪,阮灿华,童宁,武小梅..基于正序突变量相轨迹辨识的可再生能源配电网电流保护[J].发电技术,2024,45(4):753-764,12.基金项目
国家自然科学基金项目(51907069) （51907069）
中国南方电网有限责任公司科技项目(GDKJXM20220821) （GDKJXM20220821）
广州市基础与应用基础研究项目(202201010188). Project Supported by National Natural Science Foundation of China(51907069) （202201010188）
Science and Technology Project of China Southern Power Grid Co.,Ltd.(GDKJXM20220821) （GDKJXM20220821）
Basic and Applied Basic Research Project of Guangzhou(202201010188). （202201010188）
