有源钳位三电平变频器及其结温平衡控制

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Abstract Traditional neutral point clamped (NPC) three-level converter has a drawback of unbalanced junction temperatures among the power devices, which severely limits the converter’s capacity. While the Active NPC (ANPC) three-level has the potential to overcome this drawback and obtanins an even distribution of junction temperatures. In this paper, the switching states and commutations of ANPC are analyzed, and the loss and heat dissipation model of power devices are given as well. Furthermore, two pulse width modulation (PWM) strategies of ANPC are introduced, based on which a novel junction temperature balancing control method is proposed. Experimental results demonstrate that the proposed method could adjust the operating proportion dynamically between PWM type 1 and type 2 under different modulation indexes, and thus the balanced junction temperatures can be achieved. Compared to NPC three-level converter, ANPC has the ability to raise its capacity of 23.1% and 33.3% respectively under inverter and rectifier operation modes. So the ANPC three-level converters are more competitive for engineering applications.

Key words： Active neutral point clamped three-level loss heat dissipation modulation strategy junction temperature balancing

Received: 17 November 2010 Published: 19 March 2014

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TM464

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	Tan Guojun
	Jing Wei

Cite this article:

Tan Guojun,Jing Wei. Active Neutral Point Clamped Three-Level Converter and Its Junction Temperature Balancing Control[J]. Transactions of China Electrotechnical Society, 2012, 27(2): 97-102.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I2/97

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