Enhancing PV Maximum Power Point Tracking in Residential Charging Stations through Variable Step Size Modification in P&O Algorithm

This paper demonstrates a methodology to enhance the power generation of photovoltaic (PV) systems through the implementation of the maximum power point tracker (MPPT) algorithm. A crucial aspect of optimizing MPPT performance involves modifying the variable step size within the algorithm. This modification offers significant advantages, including a faster response time in reaching the maximum power point and the ability to achieve a more optimal maximum power value. In this study, the MPPT modification is implemented within the SEPIC converter, serving as the actuator system, with a 100 Wp PV serving as the power source and a 12 V 33 Ah battery serving as the load. The PV power generated is utilized to charge the battery. The results of the experiment reveal that the MPPT with the modified variable step size achieved the maximum PV power in the shortest time of 2.25 seconds, whereas the unmodified MPPT required 4.25 seconds.