Permanent magnet synchronous motor cascade control method based on generalized predictive control

Abstract

The invention is suitable for the technical field of motor control, and provides a permanent magnet synchronous motor cascade control method based on generalized predictive control, and the method specifically comprises the steps: obtaining the d-axis current and q-axis current of a permanent magnet synchronous motor under a synchronous rotating coordinate system and the rotating speed, collectedby a rotating speed / position sensor, of the permanent magnet synchronous motor; inputting the obtained d-axis current, q-axis current and rotating speed into an outer ring sliding mode disturbance observer to obtain an outer ring disturbance value, and meanwhile, inputting the outer ring disturbance value into an outer ring generalized prediction controller to obtain a q-axis current reference value; inputting the obtained d-axis current, q-axis current and rotating speed into an inner ring sliding mode disturbance observer to obtain an inner ring disturbance value, and simultaneously inputting the inner ring disturbance value, a q-axis current reference value and a given d-axis current reference value into an inner ring generalized prediction controller to obtain a d-axis voltage and a q-axis voltage; and the operation of the permanent magnet synchronous motor is controlled through coordinate change and the space vector pulse width modulator. The method can improve the adaptability and robustness of a control system while guaranteeing the quick response of the permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a cascade control method of a permanent magnet synchronous motor based on generalized predictive control. Background technique [0002] Due to the advantages of high efficiency, high torque-to-current ratio, high power density, and reliability, permanent magnet synchronous motors have been widely used in electric vehicles, aviation industry and other fields. In most permanent magnet synchronous motor applications at present, the vector control strategy has become a general control scheme. The vector control strategy adopts a cascaded control structure composed of an outer loop speed controller and an inner loop current controller. The design of the controller has an important impact on the motor control performance, efficiency and reliability. Currently, the traditional proportional-integral ( PI) controller. But the permanent magnet synchronous motor is a non...

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Problems solved by technology

However, this method is based on nominal system modeling, so when the parameters change and the model is uncertain, its control performance will be affected or even fail

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