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

doi:10.19595/j.cnki.1000-6753.tces.191632

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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.

Key words： Three level laminated bus-bar coupled over-voltage stray inductance

Received: 26 November 2019

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TM46

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	Geng Chengfei
	Yang Bo
	Wu Xiang
	Tan Guojun
	Zhang Minghua

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Geng Chengfei,Yang Bo,Wu Xiang等. Coupled Over-Voltage Analysis and Decoupling Method of IGBT on the One Laminated Bus-Bar Based on Back to Back Three-Level Converter[J]. Transactions of China Electrotechnical Society, 2020, 35(zk2): 440-449.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191632 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/Izk2/440

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