An Adaptive Transient Inrush Current Suppression Strategy for Virtual Oscillator–Controlled Grid‐Forming Inverters

ABSTRACT When a grid voltage sag fault occurs, the resulting inrush current may damage system components. However, research on suppressing inrush currents in systems based on virtual oscillator control (VOC) is relatively scarce. To address this issue, this paper first establishes a grid‐connected inverter system based on dual‐loop (voltage and current) Andronov–Hopf VOC (AHO‐VOC). An adaptive output grid voltage calculation strategy is proposed to output a stable signal during steady‐state operation while rapidly adjusting the calculated value during grid voltage sag faults to suppress inrush current generation. Subsequently, based on the application of steady‐state virtual impedance, an adaptive transient virtual impedance control strategy is designed. This strategy generates corresponding virtual impedance based on the severity of the grid voltage sag, which then decays to zero. This effectively suppresses inrush current generation, avoids excessive power losses caused by prolonged virtual impedance, and simultaneously adjusts the AHO reference voltage to ensure the system outputs power according to the set value and establish a large‐signal model of the system to analyze the impact of the proposed control strategy on the stability of the system. Finally, the effectiveness of the proposed control strategy is verified through MATLAB/Simulink and experiments.