Double-bus power converter for inhibiting torque pulsation of switched reluctance motor and control method thereof

Abstract

The invention discloses a double-bus power converter for inhibiting the torque pulsation of a switched reluctance motor and a control method thereof. The double-bus power converter comprises an auxiliary power supply and a basic power converter; the auxiliary power supply comprises a power changeover switch Sa, a diode Ds1, a power side capacitor C1 and a high-voltage capacitor C2; one phase of the basic power converter comprises a switching device Sx and a diode Dx, and when the switching device conducts, winding current increases and motor output torque increases; when the switching device is switched off, the winding current is released via the diode, and the motor output torque decreases. The invention has the following advantages: only a half of controllable power devices are used, so the cost and size of the power converter are reduced; the energy of the degaussing winding of the motor is sufficiently utilized by the auxiliary power supply, so the efficiency of the motor is increased; because the voltage of the auxiliary power supply is 3 to 4 times higher than the voltage of a main power supply, the phase change time of the motor is shortened remarkably, consequently, the control method does not need advance turn-on angle and turn-off angle, and thereby the control policy is simplified.

Description

technical field [0001] The invention relates to a double-bus power converter capable of suppressing torque ripple of a switched reluctance motor and a control method thereof, and belongs to the technical field of motor power converter topology and control. Background technique [0002] The switched reluctance motor (Switched Reluctance Motor, SRM) only has windings on the stator, and the rotor is composed of silicon steel sheets. It is not only strong in structure, easy to process, and low in cost, but also flexible in control and high in efficiency. Electrical appliances have been used to a certain extent. But SRM's doubly salient pole structure and time-varying nonlinear electromagnetic characteristics make its torque ripple and noise larger, which limits its application range. Although the optimization of the motor body structure can reduce the torque ripple, it increases the difficulty of motor manufacturing. Advanced control algorithms such as direct instantaneous tor...

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Problems solved by technology

Advanced control algorithms such as direct instantaneous torque can reduce torque ripple without changing the structure of the motor, but it needs to accurately measure the phase winding flux linkage and electromagnetic torque, and the efficiency of the motor is significantly reduced

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