Positionless strategy for wind power generation system based on composite control strategy

To achieve the goal of maximum power output of direct drive permanent magnet synchronous generator (PMSG), this study designs a position sensorless control strategy for wind power generation system based on composite control strategy. Firstly, a model reference adaptive state observer (MRAS) is constructed to accurately estimate the angular velocity of the wind power generation system, achieving sensorless control. In order to reduce the error of delay in velocity estimation, the MRAS with Smith predictor strategy is proposed to improve the accuracy of sensorless control. Furthermore, in order to enhance the dynamic response speed and anti-disturbance ability of PMSG, this study specially designed an improved active disturbance rejection control (IADRC) strategy for the speed loop. The controller, with its excellent wind speed tracking performance, ensures that the system can achieve maximum power output under various wind speed conditions, and an IADRC strategy of a current loop is also designed. Through simulation verification, the control strategy proposed in this study not only achieves precise tracking of rotational speed, but also demonstrates significant advantages in dynamic performance, providing strong support for the maximum power tracking operation of permanent magnet synchronous wind power generation systems.