大尺寸电力电容器杂散电感提取方法研究  

Research on stray inductance extraction method for large-size power capacitor

作　　者：谭一帆 陈燕平 窦泽春 漆宇 谢舜蒙 杨乐乐 TAN Yifan;CHEN Yanping;DOU Zechun;QI Yu;XIE Shunmeng;YANG Lele(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China)

机构地区：[1]中车株洲电力机车研究所有限公司,湖南株洲412001

出　　处：《机车电传动》2024年第4期26-33,共8页Electric Drive for Locomotives

基　　金：国铁集团科技研究开发计划项目(N2022J051,K2021J046)。

摘　　要：变流器换流回路存在的杂散电感对于功率半导体器件的影响巨大,然而准确提取大尺寸电力电容器的杂散电感难度较大。目前,对电力电容器杂散电感标准的提取方法为放电法,但是该方法不适用于包含多谐振频率的电容器。由于积分法提取母排杂散电感的精度高,故将积分法推广到提取大尺寸电力电容器杂散电感,明确误差校正过程,将积分法结果作为准确结果。积分法虽然精度高,但是会占用大量试验资源,并存在高压安全风险,效率较低。因此,文章提出了一种基于阻抗分析仪的杂散电感提取方法,详细介绍了测试工装和阻抗补偿方法。将阻抗分析仪测量结果与积分法测量结果进行对比,其误差小于7.3%,证明了基于阻抗分析仪提取方法的准确性,并且该方法不存在高压试验风险,测量便捷、复用性强、效率高。Stray inductance present in the commutation loop of converters significantly impacts power semiconductor devices.However,accurately extracting stray inductance from large-size power capacitors remains challenging.While the discharge method is the current standard extraction technique,it is unsuitable for capacitors containing multiple resonance frequencies.Leveraging the high accuracy of the integral method in extracting stray inductance from busbars,an extension has been made to extract stray inductance from large-size power capacitors.Enhanced by a clarified error correction process,the results of the integral method are considered accurate.Despite the integral method yielding highly accurate results,it demands substantial testing resources,poses high-voltage safety hazards,and exhibits low efficiency.This paper presents a stray inductance extraction method utilizing an impedance analyzer,and provides a detailed explanation of the testing fixture and impedance compensation method.Comparing the results obtained from the impedance analyzer with those from the integration method revealed an error of less than 7.3%,which proved the accuracy of the proposed extraction method.In addition,this method offers convenient measurement,strong reusability and high efficiency,without the risks associated with high-voltage testing.

关 键 词：大尺寸电力电容器 杂散电感 放电法 积分法 阻抗分析仪 测试工装 

分 类 号：TM53[电气工程—电器]