Robust integral backstepping controllers for boost converter and H-bridge inverter with LC-filter in Photovoltaic systems

Abstract The dependence of photovoltaic system performance on variable weather conditions influences their reliability and efficiency. In order to contribute to solving these problems, a hybrid algorithm combining the basic perturb and observe (P&O) technique and Integral Backstepping Controllers (IBSC) for the control of the boost converter and the single-phase inverter has been proposed and validated using the Matlab/Simulink platform. The proposed control strategies give a good extraction of the photovoltaic Maximum Power Point (MPP) with a DC-DC conversion efficiency of 99.19% and 99.97% for non-linear and linear loads respectively at the solar irradiation of 900 W m −2 . The sine wave of the inverter output voltage with a fixed reference has minimized a tracking error to 0 V, while its THD is limited to 0.05% and 0.16% for linear and nonlinear loads, respectively. A comparison of the simulation results with standard Backstepping control, sliding mode control, and hybrid fuzzy-sliding mode control exhibits the effectiveness, superiority, and satisfactory performance of the proposed control schemes in minimizing harmonics under variable irradiance conditions regardless of the load type.