基于LCL滤波器的复合控制策略

doi:10.3969/j.issn.0255-8297.2019.04.002

Abstract

Abstract: LCL type grid-connected inverters, when directly adopting the proportionalintegral (PI) and repetitive control series or parallel control strategies, generally suffer the problem of controllers interfering with each other. To overcome the problem, we propose a series-parallel composite control strategy for grid-connected inverters in this paper. This strategy combines the dynamic response of PI control with strong anti-interference ability of quasi-proportional resonance (QPR) and high steady-state accuracy of repeating control. The PI controller performs fast error-tracking dynamic state, whereas in steady state, no static error compensation is required by using repeating control and QPR. The design principle of each controller is analyzed in detail, and the Matlab simulation model of each controller is established. Simulation results show that the series-parallel composite control scheme has better dynamic response speed and steady-state compensation performance.

Key words: proportional-integral (PI) control, repetitive control, quasi-proportional resonance (QPR) control, series-shunt compound control, notch filter

CLC Number:

TP273

XUAN Zhaoyan, JIA Wanyong, CHEN Xuebin, JING Huicheng, ZHAO Xin, MA Zhenyu. Compound Control Strategy Based on LCL Filter[J]. Journal of Applied Sciences, 2019, 37(4): 447-458.

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Compound Control Strategy Based on LCL Filter

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