高压电器2025，Vol.61Issue(2)：141-150,10.DOI:10.13296/j.1001-1609.hva.2025.02.016
积污对光触发晶闸管换流阀电压监测板的影响及其对策研究
Influence of Contamination on Voltage Monitoring Board for Light Triggered Thyristor Converter Valve and the Corresponding Countermeasures
摘要
Abstract
In recent years,there have been many converter valve outage accidents in the UHVDC project due to con-tamination of the thyristor voltage monitoring board(TVMB).In this paper,the TVMB fault is studied deeply.Firstly,the operating principle of TVMB is introduced,the circuit of key modules is analyzed and the failure mechanism of TVMB is discussed.Then,the circuit model of TVMB is set up and the simulation work is performed.The influence of component parameters on the function of TVMB is mainly studied.After that,a high voltage application test plat-form of TVMB is set up,and the theoretical and simulation results are verified.Finally,the prevention countermea-sures against TVMB fault is proposed.The research results show that the contamination accumulation of TVMB is se-rious after long-term operation.In high humidity environment,the damp of contamination layer keeps the actual resis-tance of grading resistance reduced,resulting in the generation of check-back pulse signal in advance.The parallel resistance of the energy storage capacitor is reduced,resulting in no generation of the check-back pulse signal.It is shown by the the recoverability test results that the TVMB fault will not cause destructive damage.Therefore,such prevention countermeasures as reducing the relative humidity of valve hall are proposed and regularly performing TVMB cleaning are raised,which have been successfully applied in Baoan converter station.关键词
晶闸管电压监测板/表面污秽/相对湿度/均压电阻/储能电容Key words
thyristor voltage monitoring board/surface contamination/relative humidity/voltage balancing resis-tor/energy storage capacitor引用本文复制引用
刘子琛,王黎明,尹芳辉,徐永生,张福增..积污对光触发晶闸管换流阀电压监测板的影响及其对策研究[J].高压电器,2025,61(2):141-150,10.基金项目
国家自然科学基金资助项目(51977118) （51977118）
特高压工程技术(昆明、广州)国家工程实验室开放基金重点项目(NEL201903).Project Supported by National Natural Science Foundation of China(51977118),National Engineering Laboratory for Ultra High Voltage Engineering Technology(Kuming and Guangzhou,China)Foundation(NEL201903). （昆明、广州）
