A Robust Control Framework Using DISMC-KY Converter and Feedforward Fast Decoupled Current Controlled Inverter for Grid Integrated Solar EV Charging

Abstract

The increasing adoption of Electric Vehicles (EV s) and renewable energy integration has highlighted the need for efficient Photovoltaic (PV)-based EV charging systems with surplus power export capability. However, on the DC side Partial Shading Conditions (PSC) affects Maximum Power Point Tracking (MPPT) performance, while traditional converters introduce high ripple and discontinuous currents, limiting PV energy utilization. On the AC side, conventional inverter control suffers from cross-coupling effects, resulting in poor dynamic response, high THD and reduced grid-code compliance, leading to inefficient EV charging performance. To overcome these limitations, this paper proposes a grid integrated PV-EV charging system employing an Incremental Conductance (InC) MPPT based Double Integral Sliding Mode Controlled (DISMC) KY converter for DC–DC conversion and a Feed-Forward Fast Decoupled Current Control (FF-FDCC) strategy for inverter regulation. The DISMCcontrolled KY converter suppresses chattering, achieves rapid MPPT convergence with negligible steady-state error and thereby enhances power-conversion efficiency, resulting in higher charging current and reduced EV charging time. On the AC side, the FFFDCC strategy eliminates d–q cross coupling effect with minimal sensor dependency. Spectral analysis confirms significant suppression of switching harmonics and conducted EMI, with grid current THD reduction within IEEE limit. The proposed approach enables dynamic reactive power compensation without controller re-tuning. A state-space-based power management scheme enables seamless transition between PV to EV charging mode and grid export mode, maximizing solar energy utilization. Simulation studies and hardware validation confirm accurate MPPT tracking under PSC and robust grid side stability is verified through Lyapunov and Bode plot analyses.