换流阀阻尼电容器等效温升试验及寿命评估  

Equivalent temperature rise test and life evaluation of converter valve damping capacitor

作　　者：周晨 张翔[1] 刘磊[1] 黄华[1] 杨帆[1] 方太勋[1] ZHOU Chen;ZHANG Xiang;LIU Lei;HUANG Hua;YANG Fan;FANG Taixun(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力工程技术》2022年第5期149-155,共7页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2016YFB0900602);国家电网有限公司科技项目(SGSXDK00SPJS2100509)。

摘　　要：阻尼电容器是换流阀内核心元件,有效评估其运行寿命,对换流阀状态评估及阻尼电容器国产化研究具有重要意义。首先,文中结合换流阀阻尼电容器应用原理,提出多频率点等效温升试验方法,通过等效计算阻尼电容器实际工作时的损耗、灵活选择试验时的频率和电流,准确评估阻尼电容器实际运行时内部温度及热阻。然后,综合考虑换流阀阻尼电容器实际运行环境及工作温度,分析寿命影响因子,并在经典寿命预测模型基础上,提出老化试验与曲线拟合相结合的改进寿命预测方法,该方法能够缩短试验时长、节约试验成本。最后,结合实际工程参数分析电容器运行时的内部温升及热阻,进一步在寿命预测试验中评估试品阻尼电容器的预期寿命,所得结果满足特高压直流工程要求。The damping capacitor is core component of converter valve.Effectively evaluating life of damping capacitor is of great significance for the evaluation of the converter valve state and the stady of the localization of the damping capacitor.First of all,combined with the application principle of the damping capacitor of the converter valve,a multi-frequency point equivalent temperature rise test method is proposed.By equivalently calculating the loss of damping capacitor during actual operation and flexibly selecting the frequency and current for the test,the internal temperature and thermal resistance of damping capacitor during actual operation can be accurately evaluated.Then,considering the actual operating environment and working temperature of the damping capacitor of the converter valve,the life-influencing factors are analyzed.A life prediction method combining aging test and curve fitting is proposed based on the classical life prediction model.The proposed method can shorten time and cost of the test.Finally,the internal temperature rise and thermal resistance of the capacitor during operation are analyzed in combination with the actual engineering parameters,and the expected life of the damping capacitor sample is further evaluated by the life prediction test.The obtained results meet the requirements of ultra high voltage direct current projects.

关 键 词：直流输电 换流阀 阻尼电容器 等效温升 加速老化试验 寿命预测 

分 类 号：TM46[电气工程—电器]