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Title: An improved dual-loop feedforward control method for the enhancing stability of grid-connected PV and energy storage system under weak grids
Authors: Li, Chunxu
Liu, Xinrui
Wang, Rui
Zhang, Yi
Zhang, Li
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2022
Source: Li, C., Liu, X., Wang, R., Zhang, Y. & Zhang, L. (2022). An improved dual-loop feedforward control method for the enhancing stability of grid-connected PV and energy storage system under weak grids. Frontiers in Energy Research, 10, 939376-.
Journal: Frontiers in Energy Research
Abstract: Although the stability of the grid-connected photovoltaics (PV) and energy storage systems under weak grids has been widely researched, the classical improvement methods focus more on suppressing the harmonics introduced by the phase-locked loop (PLL). Furthermore, the current distortion caused by the DC voltage loop is difficult to be eliminated. In this study, based on the hybrid energy storage system of battery-supercapacitor, a dual-loop compensation method is proposed. First, the small-signal model and output impedance matrix are built in d-q axis. Second, for different disturbance loops, a DC voltage loop disturbance compensation method based on power feedforward is proposed to suppress the harmonics caused by the DC voltage controller (DVC). In addition, a voltage feedforward PLL disturbance compensation method is proposed, which can reduce the PLL perturbations and revise the output impedance to improve system stability. Finally, the output impedance frequency characteristic analysis and the hardware-in-the-loop (HIL) simulation results show that the proposed control method can effectively improve the stability of the system under weak grids.
ISSN: 2296-598X
DOI: 10.3389/fenrg.2022.939376
Schools: School of Electrical and Electronic Engineering 
Rights: © 2022 Li, Liu, Wang, Zhang and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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