微网中双向DC-AC变流器的性能优化控制

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Abstract In the dual-direction DC-AC converter used to connect the DC microgrid and the AC grid, the AC voltage and DC voltage harmonics will generate lower-order harmonics in the AC grid current of the DC-AC converters. In order to tackle the problem, the grid current expression of the DC-AC converter considering the AC and DC dual side voltage harmonics is deduced for the first time and the essence and character of this effect have been revealed. The proportional-integral-dual repetitive control strategy is introduced into the d and q axis of the grid current to control the grid current of the DC-AC converter. Furthermore, aiming at the problem that the non-integral ratio of the sampling and fundamental frequencies in the digital system will decay the gain of the repetitive controller, a gain enhancement approach for the repetitive controller with the desirable sampling point linear interpolation algorithm is proposed to improve the performance of the repetitive control in terms of cancelling the grid voltage harmonics. Detailed simulation and experimental results validate the accuracy and validity of the theoretical analysis and the improvement scheme of the AC grid current waveform quality of the DC-AC converter.

Key words： Microgrid DC-AC converter dual-side voltage harmonics repetitive control

Received: 30 November 2015 Published: 20 April 2016

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TM46

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	Articles by authors
	Yang Gang
	Yang Qixun
	Zhang Tao
	Liu Shu
	Zhang Heng

Cite this article:

Yang Gang,Yang Qixun,Zhang Tao等. Improvement Control of Dual-Direction DC-AC Converters for Microgrids[J]. Transactions of China Electrotechnical Society, 2016, 31(7): 81-91.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I7/81

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