Backstepping Controllers Design for a Grid Connected Wind-Photovoltaic Hybrid Power System

Abstract

This paper focuses on the maximum power point tracking (MPPT) and unity power factor operation of a grid connected wind-photovoltaic hybrid energy conversion system based on the doubly fed induction generator (DFIG). The proposed research work is based on the nonlinear mathematical models of the wind turbine, the DFIG, the photovoltaic generator, the DC-DC boost converter and the three phase inverters. Fieldoriented control technique is used to obtain a simplified model that facilitates the design of controllers, and a backstepping control strategy is used to develop the control laws for power converters of the hybrid system. Numerical simulation, realized in MATLAB/Simulink environment under different atmospheric conditions acting on the hybrid system, confirm the validity and effectiveness of the proposed controllers.