An Enhanced Predictive Control Scheme for Vehicle-to-Grid Integration During Voltage Sag

In AC power systems, ensuring low-voltage ride-through (LVRT) capabilities with active and reactive power sharing is critical for grid stability. The challenge of double-frequency oscillations in distributed generation (DG) further highlights the need for improved control schemes. This paper introduces an enhanced model-predictive control (MPC) strategy tailored for LVRT capabilities in grid-following (GFL) inverters, targeting grid-connected DGs, including renewable energy sources (RES), electric vehicles (EVs), and energy storage systems. Existing virtual synchronous generator (VSG) control exhibits limitations in operating under grid faults, leading to challenges in current limitation and reactive power provision. To address these limitations, an enhanced VSG-MPC-based scheme with LVRT capability is proposed. The proposed strategy enhances the incorporation of DGs, mainly vehicle-to-grid (V2G) integration, under various faults, facilitating current limitation and reactive power support through the control of positive and negative sequence components. The double-frequency fluctuation is suppressed to maintain active and reactive power injection during unforeseen symmetrical and asymmetrical faults. The proposed strategy is validated through simulation scenarios via MATLAB/Simulink environment, validating its efficacy.