三电平整流器的PFC及中点平衡控制方法

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Abstract A synchronous control method based on power balance is proposed to solve the problem that the input current THD of power factor correction can be greatly affected by phase unbalance, harmonics, offset, notching and so on. Furthermore, the feedforward control of load current is added to restrain the disturbance of both grid voltage and load, which improves the dynamic performance of system. On the basis of analyzing the mathematical model of three-phase three-level rectifier, a digital compensator for neutral point potential control is designed to suppress voltage unbalance of the capacitors. Simultaneously the amplitude regulation of the compensator is optimized using particle swarm optimization algorithm, which reduces the effect of neutral point potential adjustment on current THD. The control method is verified by the experimens on a prototype of 2.4kW, of which the THD is less than 5% when fully loaded, and the deviation of neutral point potential is less than 5V.

Key words： Unit power factor phase locked loop balance of neutral point three level rectifier

Received: 21 May 2008 Published: 17 February 2014

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TM461

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	Articles by authors
	Zhang Dongsheng
	Zhang Donglai
	Wang Tao
	Su Baoku

Cite this article:

Zhang Dongsheng,Zhang Donglai,Wang Tao等. PFC and Neutral Point Balanced Control Method of Three-level Rectifier[J]. Transactions of China Electrotechnical Society, 2009, 24(10): 81-86.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I10/81

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