提高LCL型并网逆变器阻抗重塑控制鲁棒性的延时补偿方法

doi:10.19595/j.cnki.1000-6753.tces.L70043

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Abstract The impedance shaping control is capable to increase output impendence of the grid-connected inverter with LCL Filter, enhancing the harmonic-rejection-ability against the grid-voltage distortions. However, digital control method is applied with a control delay, which decreases the stability of the inverter as well as the output impedance at the frequencies above 1/6 of the sampling frequency (f_s/6). In this paper, a discrete state predicting method for LCL filter is proposed to modify the virtual impedance by compensating the phase lag in control loop. The proposed strategy can effectively increase the output impedance to improve robustness of the impedance shaping control, and exhibit strong rejection ability of grid-voltage harmonics. Experimental results with a LCL-type three-phase grid-connected inverter verify the validity of the proposed strategy.

Key words： Grid-connected inverter impedance shaping time delay compensation

Received: 22 July 2016 Published: 14 September 2017

PACS:

TM464

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	Articles by authors
	Xie Wenhao
	Liu Yiqi
	Wang Jianze
	Ji Yanchao
	Yu Jilai

Cite this article:

Xie Wenhao,Liu Yiqi,Wang Jianze等. A Delay Compensation Method of the Grid-Connected Inverter with LCL Filter to Improve Robustness of the Impedance Shaping Control[J]. Transactions of China Electrotechnical Society, 2017, 32(增刊1): 178-185.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L70043 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I增刊1/178

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