Control strategy of an LCL type grid-connected inverter with the influence of a phase-locked loop under a weak power grid

被引：0
|
作者：
Liu R. [1 ]
Chen Z. [1 ]
Tang W. [1 ]
Zhu J. [1 ]
机构：
[1] College of Electrical Engineering, Guizhou University, Guiyang
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2022年 / 50卷 / 05期
关键词：
Complex vector; Control strategy; Impedance model; LCL grid-connected inverter; PLL; Weak power grid;
D O I：
10.19783/j.cnki.pspc.210569
中图分类号：
学科分类号：
摘要：
In a new energy grid-connected inverter it is easy to induce wide-band oscillation under a weak power grid. To analyze the occurrence mechanism of oscillation instability, the impedance model of a three-phase LCL grid-connected inverter considering the influence of phase-locked loop is established based on the complex vector transfer function method. Then the mechanism of frequency coupling is analyzed. The equivalent output impedance model of the interaction between grid-connected inverter system and grid impedance is derived, and the influence of phase-locked loop on the stability of the grid-connected inverter is analyzed using, an impedance stability criterion. To limit the adverse effect of the phase-locked loop on the stability of the grid-connected inverter system, an improved control strategy of disturbance voltage feedforward compensation is proposed. Finally, a Matlab/Simulink model is built to verify the accuracy of the stability judgment based on the established impedance model and the effectiveness of the improved control strategy. © 2022 Power System Protection and Control Press.
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页码：178 / 187
页数：9
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