Sliding Mode Control Approach for Maximum Power Tracking in Single-Phase Grid-Connected Photovoltaic Systems

This work presents a new control method to track the maximum power point of a single-phase grid- connected photovoltaic (PV) system. This converter is built on two stages: a DC/ DC stage and a DC/ AC stage. The two blocks are bound by a DC voltage intermediate bus. We seek the achievement of three control objectives: (i) maximum power point tracking (MPPT) of (PV) module. (ii) tight regulation of the DC bus voltage and (iii) unity power factor (PF) in the grid. To meet these objectives, a multi-loop controller is designed using the sliding mode technique based on an averaged nonlinear model of the whole controlled system. It is formally shown, through analysis and simulation results that the developed strategy control actually meets its objectives. Keywords: photovoltaic system, maximum power point (MPP), boost converter, sliding mode, unity power factor, lyapunov. I. INTRODUCTION Due to the requirement for environmental preservation and dramatic increase in energy consumption over the last decades, most countries have decided to strongly promote and develop clean and sustainable power generation sources. Also, governments encourage resorting to such energy solutions through significant tax credits.