注入零序分量SPWM调制三电平逆变器直流侧中点电压平衡控制机理

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Abstract The neutral point voltage balancing control of three-level neutral-point-clamped inverter is still a hot researching point, the solutions of which can be classified into two categories: adding accessory hardware circuit and improving modulating means. In respect of size, loss and stability of the system, the latter is more preferred. SVM has a good performance on three-level NPC inverter voltage balancing while the complexity increases largely as a result of the increasing levels, by contrast SPWM injected zero-sequence voltage is much simpler. This paper makes a study on the control mechanism of SPWM injected zero-sequence voltage. It is theoretically proved that only 6n times zero-sequence voltage injected into reference voltages could draw a dc part which can be adjusted by amplitude and initial phase angular of zero-sequence in the neutral point over a fundamental period to do voltage balancing control, neither do the 6n-3 times zero-sequence voltage. Numerical simulations are identical to the conclusion.

Key words： Zero-sequence neutral-point clamped three-level inverter voltage balancing control reactive power

Received: 21 October 2010 Published: 07 March 2014

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TM46

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	Wang Xinyu
	He Yingjie
	Liu Jinjun

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Wang Xinyu,He Yingjie,Liu Jinjun. Neutral-Point Voltage Balancing Principle of NPC Inverter Modulated by SPWM Injected Zero-Sequence Voltage[J]. Transactions of China Electrotechnical Society, 2011, 26(5): 70-77.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I5/70

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