Coupled Over-Voltage Analysis and Decoupling Method of IGBT on the One Laminated Bus-Bar Based on Back to Back Three-Level Converter
Geng Chengfei1, Yang Bo2, Wu Xiang1, Tan Guojun1, Zhang Minghua1
1. School of Electrical and Power Engineering China University of Mining and Technology Xuzhou 221116 China; 2. School of Mechanical Electronic and Information Engineering China University of Mining and Technology (Beijing) Beijing 100083 China
Abstract：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.
耿程飞, 杨波, 吴翔, 谭国俊, 张明华. 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[J]. 电工技术学报, 2020, 35(zk2): 440-449.
Geng Chengfei, Yang Bo, Wu Xiang, Tan Guojun, Zhang Minghua. Coupled Over-Voltage Analysis and Decoupling Method of IGBT on the One Laminated Bus-Bar Based on Back to Back Three-Level Converter. Transactions of China Electrotechnical Society, 2020, 35(zk2): 440-449.
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2020, Vol. 35 
