A Novel Maximum-Power-Point Tracking Control Method for Photovoltaic Grid-Connected System

A novel maximum-power-point tracking (MPPT) method was proposed for 10 KW single-stage three-phase photovoltaic (PV) grid-connected system. First, the step and direction of disturbance voltage, which was added to the voltage reference of the maximum power point, was intelligently adjusted by the fuzzy control and the PV array differential power to voltage. Therefore, the voltage reference of the maximum power point (MPP) of PV array could be obtained quickly at any time. Then, a double loop control system, which included the voltage loop PI controller and the synchronous current vector PI controller with feed-forward compensation, was used to control the output voltage of the PV array to track the voltag reference of MPP. Finally, the simulation was performed with the help of Matlab/Simulink & SimPowerSystems. Simulation results show that the proposed MPPT control method can track the MPP exactly and quickly so that the PV system always generates maximum power.