An open winding is series-compensated direct torque control of PMSM

The present invention discloses a series compensation control method for a direct torque permanent magnet synchronous motor winding open, cooperative control performed by the main converter and the compensation of the converter, the inverter main bear most of the active and reactive power necessary power; bear most of the converter compensating reactive power and active power necessary, so that the power factor of the main converter reaches 1 or close to 1. The present invention employs a method of direct torque control, in the weak field control process, the main converter considered as well as some reactive power and the DC bus voltage and the capacitor voltage are likely to change this situation, the use of weakening control process weakening control method of the inverter main feedback voltage, effectively extends the weakening workspace motor, the operating range of the motor increases.