Output maximization of wind generation system using sensorless controlled IPMSG

This paper proposes an output maximization control for a wind generation 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 the generator losses and maximize the output power while considering the 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 in order to increase output power. The proposed output maximization control is achieved without the use of mechanical sensors such as wind speed sensor and position sensor. The performance of the proposed generation system is examined by simulation and experiment.