Advanced nonlinear method of a Photovoltaic system connected to the single-phase network

Abstract

This paper presents an advanced nonlinear method of a photovoltaic energy chain connected to single-phase network via a single-phase inverter with a filter LCL. In this work, we tried to achieve three objectives of control: (i) the voltage supplied by the photovoltaic panel(PV) must follow the point of maximum power (MPPT),(ii) the voltage across the coupling capacitor must be regulated to ensure the transfer of energy between the two parts,(iii) the current supplied to the network must have a sinusoidal shape and in phase with the grid voltage. To achieve these objectives, we use a nonlinear method based on sliding modes and stability, in Lyapunov's sense, as a mathematical tool for the design of regulators. The simulation results were carried out in Matlab / Simulink. They show that regulators designed achieve their goals.