柔性直流输电用金属化膜电容器多频介损在线获取方法研究  

Study on Online Acquisition Method of Multi-frequency Dielectric Loss Tangent of Metallized Film Capacitor for MMC-HVDC

作　　者：郑琳子 祝令瑜[1] 汲胜昌[1] 潘亮 凌培恩 侯婷 邓军锋 ZHENG Linzi;ZHU Lingyu;JI Shengchang;PAN Liang;LING Peien;HOU Ting;DENG Junfeng(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510080,China;Xi’an XD Power Capacitor Co.,Ltd.,Xi’an 710082,China)

机构地区：[1]西安交通大学电力设备与电气绝缘国家重点实验室,西安710049 [2]南方电网科学研究院有限责任公司直流输电技术国家重点实验室,广州510080 [3]西安西电电力电容器有限责任公司,西安710082

出　　处：《电力电容器与无功补偿》2020年第4期63-68,共6页Power Capacitor & Reactive Power Compensation

基　　金：直流输电技术国家重点实验室开放基金项目(SKLHVDC-2019-KF-05)。

摘　　要：金属化膜电容器具有储能密度高、可靠性高及使用寿命长的特点,被广泛应用于柔性直流输电系统的核心设备模块化多电平换流器(modular multilevel converter,MMC)中。实际工程中,金属化膜电容器用量大且难以拆卸,因此实现柔性直流输电系统中金属化膜电容器的在线监测具有重要意义。本文提出一种金属化膜电容器多频率介质损耗角正切(tanδ)的在线获取方法,通过对电容器承受的电压电流信号进行频谱分析,获得不同频率下电容器的tanδ,最终实现对电容器的在线监测。Metallized film capacitor has such characteristic as high energy storage density,high reliability,and long life and is used widely in the modular multilevel converter for short the core equipment for flexible HVDC system.In actual engineering,metallized film capacitor is used in large quantities and is difficult to remove.Therefore,it is of great significance to realize the online monitoring of metallized film capacitors in MMC-HVDC systems.In this paper,a kind of online acquisition method for the multi-frequency dielectric loss tangent(tanδ)of metallized film capacitors is proposed.The tan δ of capacitor at different frequencies is obtained through spectrum analysis of voltage and current signal which is withstood by capacitor and on line monitoring of capacitor is finally achieved.

关 键 词：金属化膜电容器 柔性直流输电 介质损耗角正切 在线监测 

分 类 号：TM53[电气工程—电器] TM721.1