T型逆变器中点电压全范围精确平衡研究

doi:10.19595/j.cnki.1000-6753.tces.161994

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Abstract The unbalance of neutral point voltage is the inherent shortcoming of T-type inverter. The neutral point voltage offset models of space vector pulse width modulation (SVPWM) algorithm and virtual space vector pulse width modulation (VSVPWM) algorithm are established respectively. The relationship of the unbalanced region of neutral point voltage with the load power factor angle and modulation ratio is obtained. A full range accurate balance algorithm of neutral point voltage is proposed. In this algorithm, the precise balance of neutral point voltage is achieved by calculating and correcting the balance factor of the time of positive small vector. The algorithm is selected by judging the balance factor to reduce harmonics and switching losses effectively while maintaining accurate balance of neutral point voltage. Simulation and experimental results verify the proposed algorithm.

Key words： T-type inverter three-level neutral point voltage unbalance accurate balance

Received: 22 December 2016 Published: 24 April 2018

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TM464

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	Articles by authors
	Li Minyu
	Ma Xiaojun
	Wei Shuguang
	Zhang Jie

Cite this article:

Li Minyu,Ma Xiaojun,Wei Shuguang等. Research on Full Range Accurate Balance of Neutral Point Voltage for T-Type Inverter[J]. Transactions of China Electrotechnical Society, 2018, 33(8): 1814-1826.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161994 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I8/1814

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