Predictive current control method and system for permanent magnet synchronous motor based on sliding mode

Abstract

The invention discloses a sliding mode-based forecast current control method and system of a permanent-magnet synchronous motor. The method is implemented according to the following steps of inputting an equivalent current under a dq-axis coordinate system at a current moment, a d-axis reference current at a next moment and a q-axis reference current at the next moment into a dead-beat forecast current controller according to a permanent-magnet synchronous motor model which does not consider parameter change, and forecasting a voltage under the dq-axis coordinate system at the current moment; inputting the equivalent current, a motor rotational speed and a voltage under the dq-axis coordinate system at a previous moment to a high-order sliding mode differentiator to obtain dq-axis current interference caused by parameter change; and compensating the dq-axis current interference caused by parameter change to the dead-beat forecast current controller to obtain a driving voltage of the motor under the dq-axis coordinate system, and obtaining a three-phase input voltage by driving power to drive the permanent-magnet synchronous motor to run. The method has the advantages of fast dynamic response speed and high steady control accuracy, and the control accuracy and the running reliability of the permanent-magnet synchronous motor are improved.

Description

technical field [0001] The present invention relates to the technical field of permanent magnet synchronous motors, and more specifically, to a method and system for predicting current control of permanent magnet synchronous motors based on sliding mode. Background technique [0002] In recent years, with the development of rare earth permanent magnet materials and power devices, permanent magnet synchronous motors (Permanent Magnet Synchronous Motor, PMSM) have received extensive attention for their high performance, high torque inertia ratio and high energy density, especially The decline in the price of permanent magnet materials and the improvement of magnetic properties have greatly promoted the development and application of permanent magnet synchronous motors. In recent years, the permanent magnet synchronous motor system is playing an increasingly important role in the servo system with high precision and wide speed range. Permanent magnet synchronous motor is a mul...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a sliding mode based permanent magnet synchronous motor predictive current control method and system, thereby solving the problem that the prior art cannot effectively Adjusting the current loop output of the permanent magnet synchronous motor, slow dynamic response, low robustness, low control precision of the permanent magnet synchronous motor and poor operational reliability

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