45 坐标系下级联逆变器简化空间矢量调制及性能优化研究

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Abstract A simplified space vector modulation is researched in 45°coordinate system for H bridge cascaded inverter in this paper.The modulation method is simple for sector location and time calculation and is easy to be expanded to cascaded inverter with arbitrary number H bridge in each phase.The key research of the paper is to achieve inverter output performance optimization by the improvement of the simplified modulation method in 45°coordinate system.Specific improvement of the modulation method as follows:①In order to reduce the switching losses, switching frequency optimization algorithm is researched.It can effectively reduce the number of switch in the same output requirement。②In order to reduce the common-mode voltage, the modulation algorithm of inhibition zero-sequence voltage output is researched. It can effectively reduce the common mode voltage in output voltage for cascaded inverter and make the common-mode voltage fluctuate in small voltage range.Finally, simulation and experimental results verify the correctness of the proposed method.

Key words： 45° coordinate system space vector modulation switching frequency optimization common-mode voltage

Received: 17 March 2011 Published: 19 March 2014

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TM921

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	Zhu Siguo
	Ouyang Honglin
	Yan Jianling
	Yan Dejian

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Zhu Siguo,Ouyang Honglin,Yan Jianling等. Research on Simplified Space Vector Modulation and Performance Optimization for Cascaded Inverter in 45°Coordinate System[J]. Transactions of China Electrotechnical Society, 2012, 27(2): 68-76.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I2/68

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