直接并联模块化逆变器零序环流抑制

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Abstract In the FREEDM microgrid, direct parallel inverter technology can improve the capacity of solid state transformers. However, there will be large zero-sequence circulating currents, due to the impacts of the zero drift of operational amplifiers, harmonic disturbances and signal delay. Based on the average model and synchronous rotating coordinate model of zero-sequence circulating currents among direct parallel inverters, this article analyses the relationship between dq0 reference signal and the output voltage. Then an ideal machine model is proposed, to regulate the reference voltage of PWM carriers with error feedback according to a certain order, and to realize the zero-sequence circulating currents restraining and power sharing. The case study in PSCAD/EMTDC shows that the control strategy can restrain the zero-sequence circulating currents effectively, and improve the accuracy of power sharing.

Key words： FREEDM micro-grid directly parallel modular inverters ideal machine model zero-sequence circulating current restraining power sharing

Received: 01 December 2013 Published: 30 October 2015

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TM464

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	Zhang Mingrui
	Song Baihui
	Lin Xianqi
	Ouyang Li
	Sun Hua

Cite this article:

Zhang Mingrui,Song Baihui,Lin Xianqi等. Restraining Zero-Sequence Circulating Current of Directly Parallel Modular Inverters[J]. Transactions of China Electrotechnical Society, 2015, 30(20): 100-107.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I20/100

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