电力系统自动化2024，Vol.48Issue(17)：109-118,10.DOI:10.7500/AEPS20230807003
基于复频率信号注入的直流接地极线路故障测距方法
Fault Location Method for DC Grounding Electrode Line Based on Composite-frequency Signal Injection
摘要
Abstract
In the context of equipping impedance monitoring systems for grounding electrode lines in DC transmission systems,the accurate calculation of the fault distance can be achieved by using high-frequency measured impedance characteristics.However,the analysis shows that the grounding electrode line of the DC system may produce the same high-frequency measured impedance under different fault conditions,which means that the measured impedance has not a one-to-one mapping relationship with the fault distance,and it is difficult to obtain the accurate fault distance from a single measured impedance.The paper analyzes the coincidence characteristics of high-frequency measured impedance with the variation of injected signals,proposes a fault location method based on composite-frequency signal injection,and provides a strategy for selecting composite-frequencies.The fault location method based on high-frequency measured impedance amplitude-phase characteristics is improved,and the fault location is calculated accurately.Finally,the feasibility and accuracy of the proposed fault location method are fully verified through simulation cases.关键词
直流输电系统/接地极线路/故障测距/高频测量阻抗/复频率信号注入Key words
DC transmission system/grounding electrode line/fault location/high-frequency measured impedance/composite-frequency signal injection引用本文复制引用
张鑫华,何佳伟,李斌,戴魏,吴通华,叶善堃..基于复频率信号注入的直流接地极线路故障测距方法[J].电力系统自动化,2024,48(17):109-118,10.基金项目
智能电网保护和运行控制国家重点实验室资助项目(SGTYHT/20-JS-221). This work is supported by State Key Laboratory of Smart Grid Protection and Control(No.SGTYHT/20-JS-221). （SGTYHT/20-JS-221）
