Control of Double-Fed Wind-Driven Induction Generator for Catching the Maximum MechanicalPower

Abstract

ABSTRACT. Nowadays, Exploitation of the renewal wind energysuch as wind energyfinds increasing interest. Wind-turbines prime movers operate at variable speed. Therefore, it is recommended to use induction generators with such prime movers as it is suitable for such conditions.The present research is aimedat improving the performance of a wind-driven double-fed induction generator (DFIG) system at different wind speeds. A set of two converters in the rotor circuit has been controlled to inject a certain voltage. This voltageenablesthe generator to run at the speed which allows the wind turbine to extract the maximum power from the wind. The research presents a new analytical technique for calculating the injected voltage and power necessary to catch the maximum wind power. The induction generator has been modelled at steady-state conditions using frequency domain equivalent circuit. Computer-programs have been designed to compute the performance characteristics of the DFIG with this basic control strategy and compare it to the uncontrolled generator. The comparison has revealed that the performance of the controlled DFIG is clearly improved.