Efficient Sliding Mode Controllers for Off-grid Photovoltaic Systems

In this study, we have developed and simulated robust controllers with high stability for a double stage single-phase Off-grid photovoltaic (PV) system. The proposed controllers utilize the sliding mode theory to achieve fast response and robust behavior, particularly in the presence of rapid variations in irradiance. The main objectives of the proposed controllers are twofold: maximizing the power output of the PV module and ensuring the generation of a high-quality sinusoidal output current with low Total Harmonic Distortion (THD). The achieved THD value is approximately 3.44%, indicating a minimal level of harmonic distortion in the system. One of the key advantages of the proposed controllers is their simplicity in terms of modeling while still maintaining robustness against external fluctuations. The simulation results validate the performance of the suggested control approach, showcasing its effectiveness in achieving the desired control objectives.