Flux linkage dead-beat direct torque control method and system for switched reluctance motor

Abstract

The invention discloses a flux linkage dead-beat direct torque control method and system for a switched reluctance motor, and the method comprises the following steps: calculating the motor feedback torque and feedback flux linkage of the switched reluctance motor currently; determining a spatial voltage vector of a next sampling period based on the deviation between the motor feedback torque and a given torque and the deviation between the feedback flux linkage and given flux linkage, so as to complement the deviation between a feedback value of the switched reluctance motor and a given value; modulating the above-mentioned determined spatial voltage vector, and outputting a corresponding pulse signal, so as to control the switched reluctance motor to change the currently outputted motor feedback torque and feedback flux linkage of the switched reluctance motor. The method can carry out the adjustment and control of the motor feedback torque and feedback flux linkage of the switched reluctance motor precisely and effectively. In particular, the method is good in dynamic and static performances when the motor is in low-speed and high-speed operation, thereby solving a problem that a conventional control method is large in torque pulsation.

Description

technical field [0001] The invention relates to a method for controlling the torque of a switched reluctance motor, in particular to a method and a system for controlling the flux linkage of a switched reluctance motor with no-beating direct torque. Background technique [0002] At present, there are two main ways to optimize the torque control strategy of switched reluctance motor (SRM): ① realize the indirect control of torque by controlling the phase current or phase flux linkage; ② realize the torque control by controlling the synthesized instantaneous torque. direct control. Among them, compared with indirect torque control, direct torque control has the advantages of fast torque response, intuitive control strategy, and simple structure. It is the most effective means to reduce SRM torque ripple and noise and improve SRM dynamic performance, which is in line with SRM control strategy development trend. [0003] When direct torque control is implemented, the control v...

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Problems solved by technology

Another important reason for the existence of this kind of ripple is that in a digital system, the control process of the processor is discrete, and the output of the controller cannot be synchronized with the feedback of the motor within one cycle. There is a delay of one sampling period, and the value calculated at the kth sampling point is only effective in the (k+1) period

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