Electric pitch PMSM servo system based on direct torque control

As one key technology of the wind turbine system, electric variable pitch is getting more attention in the world. In this paper a new direct torque control method is applied to the electric pitch control servo system. Permanent magnet synchronous motor (PMSM) is selected as implementation motor of the electric pitch control servo system and the direct torque control (DTC) for PMSM based on space voltage vector pulse width modulation (SVPWM) is discussed. The electric pitch control servo system is designed by using direct torque control technology of stator flux. Simulation results show that system has good performance and strong robustness. The system can realize accurate position control with fast dynamic response performance.