PLL parameters tuning guidelines to increase stability margins in multiple three‐phase converters connected to weak grids

Nicolini, André; Pinheiro, Humberto; Carnielutti, Fernanda; Massing, Jorge Rodrigo

doi:10.1049/iet-rpg.2020.0028

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…In addition, (Harnefors et al, 2015), suggested not to select the bandwidths of DVC, unnecessarily large, to avoid oscillation. (Dong et al, 2014); (Wen et al, 2015a); (Wen et al, 2015b); (Bakhshizadeh et al, 2016); (Yang et al, 2019); (Nicolini et al, 2020) mainly analyzed the influence of the PLL on the stability of the inverter and pointed out that the PLL is one of the main factors that affect the stability of the system. The method of introducing a feedforward function was used by (Wang et al, 2010); (Xue et al, 2012); (Zhang et al, 2018) to improve stability.…”

Section: Introductionmentioning

confidence: 99%

An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids

Liu²,

Wang³

et al. 2022

Front. Energy Res.

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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.

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