design of maximum power point tracking in solar array systems using fuzzy controllers

in recent year's renewable energy sources have become a useful alternative for the power generation. the power of photovoltaic is nonlinear function of its voltage and current. it is necessary to maintain the operation point of photovoltaic in order to get the maximum power point (mpp) in various solar intensity. fuzzy logic controller has advantage in handling non-linear system. maximum power point trackers are so important in photovoltaic systems to increase their efficiency. many methods have been proposed to achieve the maximum power that the pv modules. this paper proposed an intelligent method for mppt based on fuzzy logic controller. the system consists of a photovoltaic solar module connected to a dc-dc boost converter and the fuzzy logic controller for controlling on/off time of mosfet switch of a boost converter. the proposed mppt controller for grid-connected photovoltaic system is tested using model designed by matlab/simulink program. comparison of different performance parameters such as: tracking efficiency and response time of the system shows that the proposed method gives higher efficiency and better performance than the conventional perturbation and observation method.