Design and simulation of fuzzy sliding-mode robust controller for grid-connected photovoltaic system

Abstract

A fuzzy sliding-mode robust controller with feed forward compensation is designed for grid-connected photovoltaic system. First, a integral sliding-mode controller is designed by exponential approach law to accelerate the system's starting phase, and for improving the stability of the system, the output of the sliding-mode controller is soften by fuzzy controller to reduce the flicking of the sliding-mode controller. Furthermore, a feed forward compensation is introduced to further enhance the system's dynamical performance. Finally, the simulation is performed with the help of Matlab/Simulink & SimPowerSystems. Simulation results show that the novel control method can successfully realize the vector decoupling of the d, q axis output current of the inverter, and compared with the sliding-mode controller, it have better dynamic and static performances and robustness under the fast change of external environment.