Modeling and Simulation of Photovoltaic system based grid Connected Converter with Fuzzy Logic Control

Abstract

this paper focused on modeling and simulation of grid connected photovoltaic system. This work presents a fuzzy logic control based maximum power point tracking approach to enhance the efficiency and robustness of the solar photovoltaic (PV) power generation and establishes a dynamic model of grid-connected PV system by Matlab/Simulink environment which reflect the characteristics of the system accurately. Grid-connected PV system includes a PV array, dc-dc converter, fuzzy logic control based MPPT, inverter, LC filter, P-Q based inverter control, a distribution network. Improved fuzzy logic control based MPPT and P and Q based inverter control scheme provides a closed loop active and reactive power control and accurate synchronization to grid. In this paper, a micro inverter with PI and fuzzy based boost converter approach is presented which enables the designer to make use of the boost converters advantages, while improving the control difficulties. This control method allows the selection of passive components predominantly based on ripple and reliability specifications while requiring only one state reference signal. This method becomes smaller and more reliable.