一种提高弱电网下LCL型并网逆变器鲁棒性的相位超前补偿策略

doi:10.19595/j.cnki.1000-6753.tces.171323

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Abstract In LCL-type grid-tied inverters, the capacitor-current-feedback active-damping method can suppress the LCL-filter resonance effectively. However, the digital-control-delay changes the effect of capacitor-current-feedback active-damping, thus affects the system robustness against grid impedance. To weaken the adverse effects of the digital-control-delay, this paper proposes a phase-lead compensation method to compensate the control-delay of capacitor-current-feedback. By analyzing the system stability under different resonant frequencies, the gain margin requirements can be always satisfied and the compensator parameters are designed. Next, to ensure the system stability under variable grid impedances, the design of capacitor-current-feedback coefficient is developed. When adopting the selected coefficient, the closed-loop pole maps with and without phase lead compensator are analyzed. Finally, a 1kW prototype has verified the proposed theoretical analysis.

Key words： Grid-tied inverter digital-control-delay LCL-filter phase-lead compensation

Received: 18 September 2017 Published: 30 October 2018

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TM464

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	Fang Tianzhi
	Huang Chun
	Chen Naiming
	Zhang Xianyun
	Huang Xin

Cite this article:

Fang Tianzhi,Huang Chun,Chen Naiming等. A Phase-Lead Compensation Strategy on Enhancing Robustness of LCL-Type Grid-Tied Inverters under Weak Grid Conditions[J]. Transactions of China Electrotechnical Society, 2018, 33(20): 4813-4823.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171323 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I20/4813

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