双脉冲测试方法在中点钳位三电平逆变器中的应用研究

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Abstract The double pulse test that is a standard mean in two level inverter is used in the NPC three level inverter, while the problem of voltage unbalance between inner and outer switchs is arisen. Based on three-level half bridge chopper circuit with two different snubbes. The state transition process is analyzied, and the circuit mechanism of voltage unbalance is explained. The reason of voltage unbalance is that the voltage of inner and outer could not be properly configured under the conventional double pulse pattern. The double pulse mean with three-switch action is adopted, and the dynamic voltage unbalance between the inner and outer switchs in conventional test is fully avoided. At the same time, the dead time of switch is considered in the new pulse pattern, and the transient characteristic of power device and the operation performance of snubber circuit can be perfectly tested. The simulation and experimental results show that the theory analysis is right and the proposed test method is rational for testing NPC three level circuit.

Key words： NPC three-level voltage unbalance pulse transmitting test method

Received: 02 June 2010 Published: 07 March 2014

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TM464

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	Meng Qingyun
	Ma Weiming
	Sun Chi
	Wang Junyan
	Ai Sheng

Cite this article:

Meng Qingyun,Ma Weiming,Sun Chi等. Research on Dynamic Voltage Unbalance of Inner and Outer Switch in NPC Three Level Circuit Test[J]. Transactions of China Electrotechnical Society, 2011, 26(8): 131-137.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I8/131

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