Design of Optimal Torque Control Method for Permanent-Magnet Synchronous Generator

Abstract

Renewable energy has been developed recently because of the fossil fuel exhaustion and environmental problems. This paper presents a control strategy for the operation of a direct-driven permanent-magnet synchronous generator- based stand-alone variable-speed wind turbine. The battery charger employs a boost converter cascaded with a Greatz bridge that can harvest the maximum power from wind turbine. Also, a buck converter is connected in series with the boost stage to ensure a constant voltage. This system can extract maximum power over the entire wind speed range and the battery charging can be realized through conventional techniques. Simulation results are presented to depict the existence of maximum power points in wind generator. Extensive simulation results have been performed using MATLAB/SIMULINK.