基于状态观测器的LCL滤波器型并网逆变器状态反馈最优化设计

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Abstract LCL-filter in grid-connected inverter has a better attenuation on switching ripples. But as a three order system, its resonance is difficult to be suppressed using traditional control strategy. This paper, based on an improved discrete state space model and improved discrete state space observer, proposes a method using optimized pole placement theory to achieve the best damping effect of the whole system, which improves the dynamic response of the system without additional sensors. Furthermore, the influence of closed-loop poles on the placement of observer’s poles, as well as the range within which the observation feedback is stable and the impact of system parameters are discussed. A 10kW grid-connected inverter with LCL-filter prototype is set up to verify the effectiveness and robustness of the proposed control strategy and observer configuration.

Key words： LCL-filter gird-connected inverter discrete state space model pole placement state observer

Received: 20 March 2012 Published: 05 November 2014

PACS:	TM76
	TM464

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	Articles by authors
	Li Bin
	Yao Wenxi
	Hang Lijun
	Lü Zhengyu

Cite this article:

Li Bin,Yao Wenxi,Hang Lijun等. Optimized Design of State Variable Feedback of Grid-Connected Inverter with LCL-Filter Based on State Observer[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 80-90.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I6/80

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