直流支撑电容器用聚丙烯膜击穿和自愈特性研究  

Study on Breakdown and Self-healing Properties of Polypropylene Film for DC-link Capacitors

作　　者：李化[1,2] 易博思 李露 李征[1,2] 陈麒任 林福昌 蔡炜[3] 方超[3] LI Hua;YI Bosi;LI Lu;LI Zheng;CHEN Qiren;LIN Fuchang;CAI Wei;FANG Chao(School of Electrical and Electronic Engineering, Huazhong University of Science & Technology,Wuhan 430074, China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science & Technology, Wuhan 430074,China;State Grid Electric Power Research Institute Wuhan Nanrui Co., Ltd., Wuhan 430074, China)

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [3]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《电力电容器与无功补偿》2019年第3期79-83,共5页Power Capacitor & Reactive Power Compensation

基　　金：国家电网公司科技项目(SGZJ0000KXJS1800345)

摘　　要：直流支撑电容器作为储能元件,应用于柔性直流输电中时,主要起电压支撑、谐波滤波等作用,持续承受直流叠加纹波电压以及高峰值电流作用。本文以厚度 6 μm 的聚丙烯膜为例,研究了直流叠加谐波作用时谐波次数和方阻对薄膜的击穿和自愈性能的影响,研究结果表明,当谐波电压为 100 Vrms,次数为 1~5 次时,谐波次数对薄膜的击穿电压无影响;击穿基本发生在交流电压正半波峰值及其附近。方阻增大,击穿电压增大,自愈能量减小,且均存在饱和的趋势。进一步,提出了直流支撑电容器用薄膜参数设计的建议。DC-link capacitor,as the charging element in the flexible DC power transmission,is used for voltage support and harmonic filtering etc.,and for withstanding continuously DC stacking ripple voltage and high peak current.In this paper,the polypropylene film with thickness of 6 μm is taken as an example to study mainly the effect of harmonic order and sheet resistance on the breakdown and self-healing properties of film. It is shown by the test result that when the harmonic voltage is 100 Vrms and the order is 1~5,the harmonic order has no effect on the breakdown voltage of the film and the breakdown is basically occurred at and around the positive half-wave peak of the AC voltage. The bigger the sheet resistance is,the bigger the breakdown voltage is and the less the self-healing energy is and the saturation tendency is existed. Finally,suggestion on the design of film parameters of the DC-link capacitors is proposed further.

关 键 词：直流支撑电容器 金属化膜 直流叠加谐波 自愈 

分 类 号：TM53[电气工程—电器]