Single-phase photovoltaic grid-connected inverter based on fuzzy Variable Step Size P&O control

Abstract

The production of electrical energy from renewable energies has become a hot topic. This work proposes a new MPPT for a photovoltaic system based on the fuzzy logic approach. The studied system consists of a PV generator, a DCDC Boost converter, a full H-bridge single-phase inverter, (RL) filter and the grid. To extract the maximum power from the PV generator we have used a new proposed MPPT based on Variable Step Size P & O and compared it with a classical Perturb and observe (P & O). In addition, the complete inverter topology of the H-bridge as well as two control loops; a voltage control loop and a current control loop are used as a link between the system and the grid. To reduce parasites in the form of voltage and current, a low pass filter with a resistor inductance (RL) has been designed. The various simulation results have shown the efficiency of the system.