Output Maximization Control of Wind Generation System Applying Square-Wave Operation and Sensorless Control

This paper proposes an output maximization control for a wind generator system with a variable speed interior permanent magnet synchronous generator (IPMSG). The generator torque is controlled according to the generator speed by employing maximum power point tracking control. The IPMSG current vector is controlled so as to minimize generator losses and maximize output power while considering converter capacity. Moreover, the converter control method is switched from sinusoidal pulse width modulator (PWM) control to square-wave operation in the high-speed region to increase output power. The proposed output maximization control is achieved without mechanical sensors such as wind speed sensors and position sensors. The performance of the proposed generation system is examined by simulations and experiments.