Design of Wind Turbine Speed Control System Based on Permanent Magnet Synchronous Motor

The constant pitch variable speed control system based on permanent magnet synchronous generator is time-varying, nonlinear and strong coupling control system. The wind is strongly disturbed during operation, especially in the high wind speed area, the system is a nonlinear system with local positive feedback and instability. To address these issues, a sliding mode control theory based on interference observation is proposed. On the one hand, a new variable exponential reaching law is adopted to greatly reduce the pulsation of sliding mode variable structure controller; On the other hand, the disturbance observer is used to compensate for the influence of aerodynamic torque, eliminate the instability of the system itself, and achieve stable operation of the unit above the rated wind speed. Finally, the rationality of the design scheme and the robustness of the controller are demonstrated through simulation.