May 1, 2022 · The grid-connected inverter has been simplified into a SISO system through the equivalent aggregation analysis of the frequency coupling, then the well-known impedance
Mar 22, 2021 · In this paper, the state space model of the whole grid connected inverter system adopting VSG under control time-delay and parameter uncertainty is established. The
Mar 24, 2021 · The dynamic performance of a grid-connected inverter in a distributed generation system brings new challenges by affecting the power quality and dynamic stability. The
Nov 17, 2023 · To analyze this multi-input multi-output system, a simplified stability analysis method based on the generalized Nyquist stability criterion
Jul 11, 2024 · The integration of photovoltaic (PV) systems into weak-grid environments presents unique challenges to the stability of grid-connected inverters. This review provides a
Jan 4, 2025 · The inverter connected to the grid employs a phase-locked loop to synchronize with the grid, and its dynamic characteristics can impact the stability of the system. Moreover, due
May 14, 2023 · Aiming at studying the system stability of the grid-connected inverter under unbalanced grid, this paper establishes the small-signal model of dual second order
Jul 3, 2025 · Identifying the stability region of grid-connected inverter (GCI) is a critical issue for estimating the operation region of renewable generation system, since its key grid-interface
May 14, 2025 · According to Figure 5, the dominant factors influencing the stability of the grid-connected inverter in the 0–300 band are PLL bandwidth, current integration factor, and feed
Mar 12, 2025 · The weak grid and high phase-locked loop (PLL) bandwidth can easily cause instability issues in the grid-connected Inverter (GCI) system. The present methods mainly
Apr 16, 2024 · Fromthis,itcanbeseenthatthestatespacemethodreliesontheintegrityanddeterminacy of the grid connected inverter system when analyzing system stability. Once the
Mar 22, 2021 · Virtual synchronous generator (VSG) control is an effective way to increase the equivalent inertia of grid connected inverter system and improve the stability of the power grid.
Jul 25, 2025 · An open access journal focused on the development of renewable energy and improving power quality, indexed in SCOPUS.
Apr 23, 2025 · As distributed renewable energy is integrated into the power grid, the issue of small-signal stability arising from the interaction between the grid
May 14, 2025 · For example, the impedance amplitude and phase sensitiv-ity change characteristics of the grid-connected inverter under different parameters and frequencies are
Nov 5, 2019 · Small-signal stability problems often occur when the inverter for renewable energy generation is connected to weak grid. A small-signal transfer function integrated model
<p>The integration of photovoltaic (PV) systems into weak-grid environments presents unique challenges to the stability of grid-connected inverters. This review provides a comprehensive
Dec 10, 2024 · The paper addresses the stability of a hybrid system consisting of grid-forming inverters and grid-following inverters, emphasizing the impact of the ratio of grid-forming
Nov 11, 2020 · The feedback control may cause the system to oscillate or even collapse due to its unreasonable parameters, so the stability analysis with considering the control parameters is
Sep 21, 2020 · The grid-connected inverter is the vital energy conversion device in renewable energy power generation. With the increasing installed capacity of renewable energy, the grid
Jun 1, 2023 · 2) Inverter-driven oscillations can be the consequence of Yaran Li et al. Small-signal modelling and stability analysis of grid-following and grid-forming inverters dominated power
Dec 21, 2023 · This paper presents an intelligent stability prediction method for high-frequency oscillation of grid-connected inverter considering time-varying parameters of power grid and
Nov 17, 2023 · To analyze this multi-input multi-output system, a simplified stability analysis method based on the generalized Nyquist stability criterion and matrix theory is proposed.
Jul 25, 2025 · DOI: https://doi /10.52152/4092 Keywords: Grid-connected Inverter (GCI), Hybrid Impedance Model, Weak Grid, Stability Margin Abstract The robustness of the grid
According to Fig. 3, it can be recognized that the grid-connected inverter system demonstrates small-signal stability for the operating conditions situated behind the red border. Moreover, the corresponding maximum real part is significantly negative, indicating that the system has a large stability margin.
As the active power of inverter 2 increases, the system transitions from stability to instability. Decreasing the active power of inverter 1 restores stability to the system. These variations in system stability are consistent with Fig. 15, confirming the applicability of the proposed algorithm to the grid-connected multi-inverter system. Fig. 14.
The robustness of the grid-connected inverter (GCI) system in weak grids is deteriorated due to consider discrete characteristics of the GCI control system.
According to the established impedance models of the inverter under the balanced and unbalanced grid conditions, the grid-connected inverter systems are MIMO high-order systems. Therefore, the GNC needs to be adopted for the stability analysis. 3.1. Stability Analysis Method of Inverters under the Balanced Grid Condition
The impedance model of the grid-connected inverter system is derived using the -linearization method in the -frame. The derivation process for both the inverter impedance and the grid impedance is presented in Appendix. Once the system impedance is determined, various stability criteria can be applied to assess system stability.
Therefore, in this paper, the stability of DSOGI-PLL-based grid-connected inverter systems under a weak and unbalanced grid, on which few studies have been carried out until now, is investigated based on the impedance-based method.
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