Robust Control Design of Permanent Magnet Direct-drive Wind Power System

Abstract

Aiming at the difficulty of rapid response control in the system caused by the high inertia of the wind turbine system with large capacity, the work studied the robust control of nonlinear speed of direct-drive permanent magnet wind turbine. After analyzing the characteristics of wind turbine as well as the nonlinear dynamic structure of permanent magnet synchronous motor, we proposed a comprehensive control strategy combining Backstepping control technology and L₂ disturbances attenuation to design the speed regulation controller of wind turbine. On the basis, the method of load torque feedforward compensation was introduced to form a quick-response control strategy that is easy to be realized. Simulation shows compared with the traditional vector control and the voltage feedforward decoupling control, the proposed control strategy has the effectiveness and robustness for the quick-response control of wind turbine with large capacity.