背靠背三电平变流器IGBT共叠层母线过电压耦合分析及解耦方法  

Coupled Over-Voltage Analysis and Decoupling Method of IGBT on the One Laminated Bus-Bar Based on Back to Back Three-Level Converter

作　　者：耿程飞 杨波 吴翔 谭国俊 张明华 Geng Chengfei;Yang Bo;Wu Xiang;Tan Guojun;Zhang Minghua(School of Electrical and Power Engineering China University of Mining and Technology,Xuzhou 221116 China;School of Mechanical Electronic and Information Engineering China University of Mining and Technology(Beijing),Beijing 100083 China)

机构地区：[1]中国矿业大学电气与动力工程学院,徐州221116 [2]中国矿业大学(北京)机电与信息工程学院,北京100083

出　　处：《电工技术学报》2020年第S02期440-449,共10页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2016YFC0600804)。

摘　　要：背靠背三电平变流器广泛应用于中压交流传动领域。单个三电平逆变器某一时刻只能存在一种换流过程。当三电平整流侧IGBT和逆变侧IGBT被放置在同一条母线上时,由于两者控制策略上的不相关性,会存在一定的电磁耦合影响,对IGBT的安全运行造成一定的威胁。该文以一种存在耦合影响的三电平叠层母线作为研究对象。首先,采用部分单元等效电路(PEEC)建立母线的等效电路模型;其次,分析整流侧和逆变侧IGBT开关暂态过电压耦合问题,并建立IGBT过电压耦合函数;进一步,对存在过电压风险的IGBT给出脉冲解耦方法;最后,通过实验对IGBT存在的过电压耦合问题和脉冲延时方法进行验证。该文的研究对于多逆变器功率器件共叠层母线设计及IGBT可靠应用具有指导意义。Back-to-back three-level converters are widely used in medium voltage AC drive applications.It has only one process of commutation at one point for one three-level inverter.When the IGBT of three-level rectifier side and the inverter side are placed on the one laminated bus-bar,there will be a certain electromagnetic coupling effect to the IGBT,which is caused by the irrelevance of the control method between them.In this paper,a laminated bus-bar of the back-to-back three-level converter with coupling effect was taken as the research object.Firstly,the equivalent circuit of the bus-bar was established by the partial element equivalent circuit(PEEC)method.Then,the transient electromagnetic coupling problem of the IGBTs between rectifier and inverter was analyzed innovatively,and the transient coupled over-voltage function was established.Furthermore,the IGBT pulse timing decoupling method was given for the coupling circuit loops that have the risk of over-voltage.Finally,the correctness of the analysis was verified by the experiment,which is instructive for the laminated bus-bar design of multi-inverters and reliable operation of IGBT.

关 键 词：三电平 叠层母线 耦合过电压 杂散电感 

分 类 号：TM46[电气工程—电器]