Sliding mode control method of permanent magnet direct drive wind power system based on improved load torque observer

In order to optimize the characteristics of nonlinearity, uncertainty and strong disturbance in the direct-drive permanent magnet synchronous wind power generation system, a control method based on the combination of sliding mode control and load torque observer is proposed in this paper. Type Load Torque Observer (LTO) and Sliding Mode Controller (SMC), the sliding mode controller accelerates the convergence speed by improving the variable exponential reaching law, and the improved load torque observer outputs a variable gain through a smoothing function. Reduce fluctuations while converging speed, and perform current compensation. Through the simulation experiments of step wind and random wind speed, the results show that, compared with the traditional SMC control method, the control method proposed in this paper effectively improves the response speed and robustness of the optimal power tracking of the wind power system.