电网技术2023，Vol.47Issue(12)：4856-4865,10.DOI:10.13335/j.1000-3673.pst.2023.1365
基于电流波形畸变特征的高比例光伏配电网故障方向判别原理
New Fault Direction Identification Based on Current Distortion Characteristics in High Proportion PV Distribution System
摘要
Abstract
With the increase of distributed PV penetration,the existing three-staged overcurrent protection faces the risk of malfunction.This paper presents a new fault direction identification based on the distortion characteristics of fault current waveforms.Firstly,the difference is explored between the fault current waveforms supplied by the distributed PV and by the traditional synchronous power.The characteristics of PV fault current distortion and the generation mechanism of harmonic components are studied.Secondly,the method of fault feature extraction is studied,and the direction blocking criterion based on fault current waveform distortion is proposed.The simulation results validate that the proposed method is able to reliably decide the forward and the reverse fault directions under different inverter control strategies with the abilities to withstand the fault resistance and the noise of signal sampling.This idea converts the interference of nonlinear characteristics to the fault direction criteria with no voltage measurement information and communication equipment,which will effectively reduce the technical difficulty of the distribution system construction.关键词
光伏并网/配电网/方向继电器/电流保护/波形畸变率Key words
PV integration/distribution system/directional relay/current protection/waveform harmonic distortion分类
信息技术与安全科学引用本文复制引用
和敬涵,王语然,李猛,杜晓通,于同伟..基于电流波形畸变特征的高比例光伏配电网故障方向判别原理[J].电网技术,2023,47(12):4856-4865,10.基金项目
国家电网有限公司科技项目"面向新型电力系统的配电网二次系统规划设计关键技术研究"(5400-202256273A-2-0-XG).Project Supported by Science and Technology Project of State Grid Corporation of China(Research on Critical Technology of Secondary System Planning and Design of Distribution Network for Novel Power System(No.5400-202256273A-2-0-XG)). （5400-202256273A-2-0-XG）
