数字控制下光伏并网逆变器稳定性分析及参数优化设计

doi:10.19595/j.cnki.1000-6753.tces.161980

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Abstract For the photovoltaic grid-connected inverter, the z-domain model under digital control is established firstly. Then through the frequency characteristics of the z-domain open-loop transfer function, the conditions of -180° crossing in different ranges of resonance angle frequency are determined. Meanwhile, combined with Nyquist criterion, the stability conditions of grid-connected inverter in different ranges of resonance angle frequency are given. Accordingly, the optimized design idea and method of photovoltaic grid-connected inverter are put forward, which can resist the wide range changes of grid equivalent impedance. Finally, the theoretical analysis is verified by the simulation and experiment.

Key words： Digital control photovoltaic grid-connected inverter stability analysis optimized design grid impedance

Received: 21 December 2016 Published: 24 April 2018

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TM464

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	Zheng Kun
	Zhou Lin
	Zhang Qianjin
	Xie Bao
	Li Haixiao

Cite this article:

Zheng Kun,Zhou Lin,Zhang Qianjin等. Stability Analysis and Parameter Optimization Design of Photovoltaic Grid-Connected Inverter under Digital Control[J]. Transactions of China Electrotechnical Society, 2018, 33(8): 1802-1813.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161980 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I8/1802

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