Parameters Influence on MPPT Efficiency for Single-Phase Grid-Connected Photovoltaic System

The single-phase grid-connected photovoltaic (PV) system was studied by simulating in MATLAB-Simulink program. This research aimed to study the influence of two parameters on the maximum power point tracking (MPPT) efficiency, e.g., a PV capacitor (C
PV
) and voltage step size. The maximum power point was tracked by using the perturbation and observation (P&O) algorithm with the PV voltage-loop and current-loop controller of the converter. The system was able to simulate a sudden increase or decline in irradiance. The result showed that the reducing voltage step size can track for better maximum power point of the PV array. The ripple voltage and ripple power have reduced values. The increased C
PV
value affects the overshoot, which has a reduced value and a faster response time for returning to a steady state. Therefore, the suitable C
PV
of 200 μF obtains the MPPT efficiency of 99.969% with a reduced overshoot and faster time response.