Fuzzy Logic Based MPPT for Solar PV Applications

Abstract: To extract Maximum Power from PV system, many MPPT techniques have been employed by the researchers. This paper presents a fuzzy logic based MPPT algorithm for a 100 kW PV System. The Duty Cycle of the DC-DC Boost converter is controlled by the proposed Fuzzy MPPT control Technique and hence Maximum power is obtained from PV system. Simulations were carried out and the proposed MPPT technique is tested under different environmental conditions. The proposed method is effectively tracking the maximum power for all environmental conditions. The output voltage of the DC-DC Converter is varying one with respect to Maximum Power Point (MPP). One more DC-DC Buck-boost converter with PI control is used in order to make the DC Bus voltage constant. A PWM Inverter with L-filter is used to generate three phase supply required to operate three phase loads and single phase loads. The results are presented for different irradiation and temperature conditions.

Keywords: Solar PV system, MPPT, DC-DC Converter, Fuzzy logic controller (FLC) based MPPT, PWM Inverter.