Design of Mppt Based Hybrid Wind and Fuel-cell Energy System

The wind energy conversion system can deliver the maximum power when the load impedance matches with the source impedance under a given wind speed. Since the load and wind speed are varying dynamically, the maximum power point tracking (MPPT) becomes more complex. A wind-generator (WG) maximum-power-point tracking (MPPT) system is presented in the present work, consisting of a high efficiency buck-type dc/dc converter and a control unit running the MPPT functions. The advantages of the MPPT method are that no knowledge of the WG optimal power characteristic or measurement of the wind speed is required and the WG operates at a variable speed. Thus, the system features higher reliability, lower complexity and less mechanical stress of the WG. A hybrid algorithm is used for tracking the maximum power. In this method, on power variation, the duty cycle is adjusted in according to the variation in rectifier output voltage.