In this paper, the authors focused on modelling and simulation of grid connected photovoltaic system. This paper 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 and a distribution network.