电力建设2024，Vol.45Issue(4)：89-99,11.DOI:10.12204/j.issn.1000-7229.2024.04.009
一种基于修正电压的新型暂态量保护原理
Novel Transient Protection Principle Based on Corrected Voltage
摘要
Abstract
Considering the characteristics of a flexible DC transmission system,in which the fault current increases rapidly and features a large amplitude when a line fault occurs,a complete fault identification of the line must be accomplished within a few milliseconds to ensure the safe and stable operation of the system.Rapidly and reliable identifying faulty lines remains challenging in protecting the lines of flexible DC transmission systems.Hence,this study proposes a new transient protection principle based on corrected voltage.First,a voltage-correction algorithm is proposed that simultaneously utilizes the amplitude and rate of change of voltage after a short circuit to identify faults more sensitively.Subsequently,an integral based on a corrected voltage is used to effectively distinguish between internal and forward external faults.Second,a new directional element is proposed to construct a pilot backup-protection criterion,which solves the problems of low sensitivity under high-resistance faults and the reverse fault misoperation of single-terminal protection.Finally,a four-terminal flexible DC system model is constructed based on the PSCAD/EMTDC simulation platform to verify the effectiveness of the scheme via simulation.关键词
柔性直流输电系统/故障识别/暂态量保护/线路保护Key words
flexible DC transmission system/fault identification/transient protection/line protection分类
信息技术与安全科学引用本文复制引用
薛士敏,李翔宇,陈文杰,张君婷,张皓明,阴文湘..一种基于修正电压的新型暂态量保护原理[J].电力建设,2024,45(4):89-99,11.基金项目
This work is supported by the Science and Technology Project of SGCC(No.5500-202199270A-0-0-00).国家电网有限公司总部管理科技项目(5500-202199270A-0-0-00) （No.5500-202199270A-0-0-00）
