Fuzzy Logic Mppt Method And Pi Control in Pv System as a Charge Controller

Abstract

In this paper Fuzzy Logic MPPT (Maximum Power Point Tracking) method applied to photovoltaic panel sourced boost converter, under variable temperature (25–60 °C) and irradiance (700–1000 W/m2) after that the PI control was applied to buck converter to behave as a charge controller. Temperature and irradiance are the factors on which voltage and current of a PV system depend. Maximum available power of PV panels changes due to change in voltage and current by variable environmental conditions. PV panels are operated at maximum power point (MPP) to decrease payback period and increase efficiency of the system. By using FLC MPPT method in this system MPP changes from 94.6% to 99.5%. PI control is a simple technique which gives satisfactory results while constant voltage and current is maintained. The goal of this study is operating PV panel at maximum power point under variable environment conditions to increase efficiency and reduce cost and also provide appropriate current and voltage for charging battery to charge quickly, reduce losses and also increase life cycle of battery. This system was established and analyzed in MATLAB/Simulink.