MPPT controller based on fuzzy logic for photovoltaic systems using line-commutated inverter and sepic converter

Abstract

A controller for maximum power point tracking (MPPT) based on fuzzy logic was developed to connect the solar panels and three phase grid through an inverter. MPPT controller traces the maximum power and then feeds this power to the three phase grid irrespective of the changes in solar irradiations. The input and output variables for the fuzzy logic controller were selected in order to vary the inverter firing angle to track the maximum power from the solar panels. The proposed system using fuzzy logic controller was built using MATLAB Simulink /Power System Block (PSB) set. A DSP controller has been embedded with program for firing of the thyristors used in the inverter with appropriate pulses. Hardware of the entire system was fabricated in the laboratory and the outputs from the PV array of 90 volts, 11 amperes are exhibited. Both the hardware and simulation outputs have been compared which are in close agreement to validate the suggested system.