期刊
IEEE ACCESS
卷 9, 期 -, 页码 33557-33568出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3061141
关键词
Damping; Voltage control; Phase locked loops; Impedance; Robustness; PI control; Harmonic analysis; Flatness-based control; LCL-filter; vector current control; voltage source converter; weak grids
资金
- Qatar National Library
This paper introduces a novel single-loop flatness-based controller for grid-side current control in a shunt converter connected to a weak grid. Experimental results demonstrate that the proposed controller outperforms traditional vector current control methods in terms of tracking capability and dynamic response.
In this paper, a novel single-loop flatness-based controller (FBC) is proposed to control the grid-side current in a shunt converter connected to a weak grid through an LCL-filter. After its mathematical description, the paper reports controller implementation and some performance comparisons with two distinct implementations of the widely diffused vector current control approach, during balanced and unbalanced grid voltages, and weak grid conditions. Obtained results highlight higher tracking capability and better dynamic response of the proposed FBC. Moreover, because of its reduced negative conductance region, unstable behaviors that can be observed in weak grids appear significantly improved due to a reduced influence of the phase-locked loop system.
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