Implementation of MPPT for PMSG-based small-scale wind turbine

Using a boost chopper to implement the maximum power point tracking (MPPT) for a PMSG-based small-scale wind turbine is described in this paper. By analyzing the characteristics of the boost chopper, the optimal duty ratio was theoretically determined by the equivalent resistance of the load. Then the duty ratio was used as a reference instruction to control the output power of the permanent magnet synchronous generator (PMSG). As a result, when the reference wind speed increases linearly from 80 to 120 r/min or other given speed is selected, the generator rotational speed could follow the reference speed accurately and rapidly, also when the duty ratio was changed from 0 to about 0.9, the maximum power point could be always tracked.