Fuzzy Mppt Based Voltage Regulation On Photovoltaic Power Supply System For Continuously Varying Illumination Condition

Due to scarcity of fossil fuel and increasing demand of power supply we are forced to utilize the renewable energy resources with the shortage of energy and ever increasing of the oil price. Researches on the renewable and green energy sources, especially solar arrays and fuel cells become more and more important. Considering easy availability and vast potential, world has turned to solar photovoltaic energy to meet its ever increasing energy demand. Due to high initial investment on PV systems and non linearity of PV cell output characteristics counteract its wide commercialization. The PV array has an optimum operating point to generate maximum power at some particular point called maximum power point (MPP). To track this maximum power point and to draw maximum power from PV arrays, MPPT controller is required in a stand-alone PV system. Due to the nonlinearity in the output characteristics of PV array, it is very much essential to track the MPPT of the PV array for varying maximum power point due to the insolation variation. In order to track the MPPT intelligent controller like fuzzy logic controller is proposed and simulated. The output of the controller, pulse generated from PWM can switch MOSFET to change the duty cycle of buck DC-DC converter.