Method for flying-starting sensorless vector-controlled permanent magnet synchronous motor

A method for flying-starting a sensorless vector-controlled permanent magnet synchronous motor (PMSM), the method comprising:

• setting, by a speed tracker of a sensorless vector-controlled PMSM in a flying-start state, an actual operating speed (Spd_act) of the PMSM as a reference speed command (Spd_ref), with a q-axis reference current (Iq_ref) and a d-axis reference current (Id_ref) at zero, for field-oriented control (FOC) to reduce a real-time running current of the PMSM, where, the reference speed command (Spd_ref) is a current speed command used in a speed control loop;
• and
• checking, using an acceleration adaptive controller, whether the sensorless vector-controlled PMSM is starting with or against wind;
• if the sensorless vector-controlled PMSM is starting against the wind, setting an acceleration of the PMSM to a preset value (a0);
• if the sensorless vector-controlled PMSM is starting with the wind, calculating a voltage error defined as a difference between a maximum bus voltage and a real-time bus voltage;
• and processing, through a proportional-integral (PI) controller, the voltage error to output a new acceleration (a) of the PMSM.