Abstract
As the power output of the photovoltaic (PV) cell changes with the insolation changing, PV cell temperature and cell voltage changing, it is necessary to control the operating voltage to draw the maximum power of the PV cell in order to increase system efficiency. Two-level three phase grid-connected PV system is designed. The forestage BOOST chopper adopt Incremental conductance algorithm to implement Maximum Power Point Tracking; The controller for the inverter system contains inner current loop and external voltage loop. According to the proposed control schemes, the phase and frequency of grid-connected current is the same as grid voltage, with the result of unity of the power, factor for power grid. The PV grid-connected system is built by MATLAB/SIMULINK, and the simulation results show that the proposed control schemes are validated.
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