SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment

Abstract

The invention relates to an SRM direct instantaneous torque control method for DC bus voltage dynamic adjustment. According to the method, a DC-DC conversion circuit is added to the front end of a traditional asymmetric half-bridge power converter; an excitation path and a demagnetization path are decoupled, and a higher demagnetization voltage can be applied, so that the winding of the switched reluctance motor is demagnetized more quickly, corresponding buck-boost adjustment is performed on the DC bus voltage of the power converter according to different operating speeds of the switched reluctance motor, and the adjustment mode has the characteristic of opening angle optimization; the commutation rule of the switched reluctance motor is improved, and a commutation conduction region executes direct instantaneous torque control to reduce torque pulsation through higher demagnetization voltage under the condition of considering the optimal turn-on angle characteristic; in the full-rotating-speed operation range of the switched reluctance motor, a control strategy is controlled through direct instantaneous torque to reduce torque pulsation, and the control strategy does not need to be switched.

Description

technical field [0001] The invention relates to the field of motor drive technology control, in particular to a direct instantaneous torque control method of a switched reluctance motor (SRM) for dynamic adjustment of DC bus voltage. Background technique [0002] The structure of the switched reluctance motor is simple, there is no winding on the rotor, the mechanical strength of the motor itself is high, and it can be used for frequent start-stop or ultra-high-speed operation. At the same time, due to the special double salient pole structure and winding conduction mode of the switched reluctance motor, large torque fluctuations will be generated during the operation of the motor. Common torque ripple suppression methods include indirect torque control method and direct torque control method. The indirect torque control method indirectly controls the output torque of the motor within the desired range through the relationship between torque, current and flux linkage, and b...

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Problems solved by technology

And when running at high speed, the reduction of motor demagnetization time may extend the phase current to the negative torque area, resulting in torque ripple

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