弱电网下具有定稳定裕度的并网逆变器阻抗重塑分析与设计

doi:10.19595/j.cnki.1000-6753.tces.190027

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Abstract The stability control of grid-connected inverter in weak grid is studied. Based on the reconstructed impedance-based stability criterion, the current double closed-loop control of three-phase LCL grid-connected inverter is used as a model to establish a Norton equivalent series and parallel impedance mathematical model for the inverter grid-connected system. By analyzing the characteristics of inverter equivalent output impedance, the parallel equivalent output impedance of inverter is selected to be reconstructed. The impedance reconstruction control technology includes three units: grid impedance detection, phase margin compensation and amplitude correction. The reconstructed equivalent impedance model can always maintain a constant stability margin for the inverter grid-connected system when the grid impedance varies widely, meanwhile, considering the detection error of the grid impedance, the system can still maintain good steady-state and dynamic performance. Simulation and experimental measurements verify the analysis.

Key words： Weak grid LCL grid-connected inverter impedance criterion impedance remodeling stability margin

Received: 08 January 2019 Published: 27 March 2020

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TM464

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	Tu Chunming
	Gao Jiayuan
	Zhao Jinbin
	Zhang Yunfei
	Guo Qi

Cite this article:

Tu Chunming,Gao Jiayuan,Zhao Jinbin等. Analysis and Design of Grid-Connected Inverter Impedance Remodeling with Fixed Stability Margin in Weak Grid[J]. Transactions of China Electrotechnical Society, 2020, 35(6): 1327-1335.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190027 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I6/1327

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