Extremum-Seeking MPPT Control for Z-Source Inverters in Grid-Connected Solar PV Systems

Maximum Power Point Tracking (MPPT) is a crucial technique in optimizing the energy conversion efficiency of photovoltaic (PV) systems. Among the various MPPT methods, Extremum-Seeking (ES) control has emerged as an effective, model-free approach for real-time power optimization in renewable energy systems. This paper proposes an Extremum-Seeking MPPT control technique for Z-Source Inverters (ZSIs) in grid-connected solar PV systems. The ZSI offers advantages over traditional inverters by providing improved efficiency and inherent protection against voltage spikes. The proposed approach aims to efficiently track the Maximum Power Point (MPP) under varying environmental conditions such as irradiance and temperature. Simulation results demonstrate the superior performance of the Extremum-Seeking MPPT technique in terms of tracking speed, accuracy, and robustness in comparison to conventional MPPT methods. The system’s integration with a Z-Source inverter further enhances system stability and performance.