TS-fuzzy based controller for grid connected PV system

Grid connected photo voltaic system is emerging as reliable and sustainable solution in future renewable energy segment. General structure of solar photovoltaic array (SPVA) consist of PV cell which convert irradiation in to electrical energy and control the flow of converter that energy fed into the grid or load. This paper presents a control scheme for a grid connected voltage source converter (VSC) based on Synchronous reference frame theory (SRFT), Takagi Sugeno fuzzy logic control scheme (TSFLC) is developed to control DC link voltage and regulate it to its reference value. A Complete two stage grid-connected photovoltaic system consisting of PV array, DC to DC Boost converter, MPPT control algorithm, SRFT control scheme for VSC is designed and discussed. On sunny days, the system injects PV generated power to the load, remaining power required by the load will be provided by the grid. Hence SPVA and the grid system together process all the reactive and active load power. If the load requirement is less then PV generation the extra energy is fed to the grid. Simulation results show the validity of the PV system under various load conditions. The array is interfaced to the grid through power conditioning unit (PCU) to change output voltages and currents. The total harmonic distortion for various load conditions falls within two percentage in proposed control scheme.