高电压技术2025，Vol.51Issue(10)：4957-4968,12.DOI:10.13336/j.1003-6520.hve.20250107
金属化膜电容器放电特征演变规律与声电联合监测方法
Discharge Characteristic Evolution and Acoustic-electrical Joint Monitoring Method for Metallized Film Capacitor
摘要
Abstract
The DC-link capacitor is a critical component of the modular multilevel converter(MMC)in flexible HVDC transmission systems,and its operational state directly impacts transmission quality and system reliability.In this paper,the evolution trend of discharge characteristics of metallized film capacitors is investigated.An acoustic-electrical joint monitoring method for metallized film capacitors is proposed by utilizing the statistical characteristics of discharge time series and the characteristics of acoustic signal energy distribution.First,the discharge time series characteristics of aging capacitors in operation are investigated,and the aging degrees of capacitors are reflected by the skewness and kurtosis of discharge characteristic spectra.Based on this,a preliminary classification can be made between capacitors in good health and different aging states.Further,for the capacitors identified to be in moderate aging or near the end-of-life,the dis-charge acoustic signals are analyzed and clustered based on the signal energy distribution.The detection of signals with the highest energy in the lowest frequency band among all discharge signals indicates that the capacitor is faulty and re-quires replacement.This study enables the identification of capacitor discharge types and the condition monitoring and diagnosis of in-service capacitors.关键词
直流输电系统/电容器/老化/放电/状态监测Key words
HVDC transmission system/capacitor/aging/discharge/condition monitoring引用本文复制引用
郑琳子,闫昕旖,汲胜昌,祝令瑜..金属化膜电容器放电特征演变规律与声电联合监测方法[J].高电压技术,2025,51(10):4957-4968,12.基金项目
国家重点研发计划(2023YFB2406900).Project supported by National Key R&D Program of China(2023YFB2406900). （2023YFB2406900）
