电力系统自动化2024，Vol.48Issue(17)：119-129,11.DOI:10.7500/AEPS20230618002
基于综合序分量的柔性直流交流送出线路单相接地距离保护
Distance Protection for Single-phase Grounding Fault in AC Transmission Lines of Flexible DC Based on Comprehensive Sequence Components
摘要
Abstract
Under the influence of the phase-controlled characteristic of the fault current of the flexible DC converter,the traditional distance protection is prone to incorrect operation behavior after a single-phase grounding fault through a transition resistance occurs in the AC transmission line of flexible DC.This paper analyzes the distribution law of electrical quantities when a single-phase grounding fault occurs in the AC transmission line of flexible DC.Using the characteristic that the negative-sequence current on the converter station side is suppressed during the single-phase grounding fault of the AC transmission line of flexible DC,a new type of single-phase grounding distance protection based on comprehensive sequence components is proposed.The proposed protection scheme eliminates the influence of transition resistance theoretically and can accurately calculate the fault location based on single-end quantities.Moreover,this protection is also suitable for the scenario that flexible DC is integrated into a weak system.Finally,the effectiveness of the proposed protection scheme is verified through simulation.关键词
柔性直流输电/综合序分量/单端量保护/距离保护/负序电流抑制/过渡电阻Key words
flexible DC transmission/comprehensive sequence component/single-end protection/distance protection/negative-sequence current suppression/transition resistance引用本文复制引用
张怀宇,郑晓冬,晁晨栩,邰能灵,刘中平,侯勇..基于综合序分量的柔性直流交流送出线路单相接地距离保护[J].电力系统自动化,2024,48(17):119-129,11.基金项目
国家自然科学基金资助项目(52277112) （52277112）
上海市启明星计划项目(18QA1402100) （18QA1402100）
国家电网公司科技项目(52080022000J). This work is supported by National Natural Science Foundation of China(No.52277112),Shanghai Rising-Star Program(No.18QA1402100)and State Grid Corporation of China(No.52080022000J). （52080022000J）
