Single-Stage PV-Grid System to Stabilize DC-link Voltage

Abstract: This paper presents a fuzzy logic-based Maximum Power Point Tracking (MPPT) controller for a single-stage solar PV grid-integrated system. The proposed scheme integrates MPPT, grid synchronization, voltage and current regulation, and ripple mitigation to enhance inverter performance. A Fuzzy Logic Controller (FLC) optimizes MPPT for efficient power extraction, while an H-bridge inverter with dual-loop control ensures DC-link voltage stability and unity power factor operation. Simulation results confirm that the inverter output current meets IEEE 519 and IEC 61727 THD standards.

Keywords: Photovoltaic (PV); single-stage; grid-interfaced PV system; FLC MPPT.