PMSM sensorless control strategy based on improved ADRC and high-frequency square wave injection

The invention discloses a PMSM sensorless control strategy based on improved ADRC and high-frequency square wave injection. The strategy comprises steps that continuous high-frequency square wave voltage signals are injected into a d axis of a vector control synchronous rotating coordinate system of a permanent magnet synchronous motor, and the frequency of the high-frequency square wave voltage signals is made to be equal to the switching frequency of an inverter; in a single high-frequency signal injection period, through two times of current sampling, the separation processing process of the fundamental current and the high-frequency response current is simplified, and no filter is needed; the fundamental current is used for performing current feedback in vector control, the high-frequency current comprises the rotor position information, the position error information is decoupled by adopting the alpha-beta axis high-frequency response signal cross multiplication method, and the rotor position is observed through a Luenberger position tracking observer; in terms of a speed controller, an improved linear active disturbance rejection controller is utilized instead of a PI controller. The method is advantaged in that the bandwidth of a sensorless control system can be improved, and higher dynamic response speed and anti-disturbance performance are achieved.