Permanent magnet synchronous motor predicted current control method and system based on FOSMC

Abstract

The invention discloses a permanent magnet synchronous motor predicted current control method and system based on FOSMC; the method comprises the following steps of carrying out comparing on the rotorangular speed and a given rotating speed to obtain a rotating speed difference, and inputting the rotating speed difference into a fractional order sliding mode controller; next, enabling an equivalent current of a dq axis at the current moment to pass through a sliding mode disturbance observer to obtain a voltage compensation quantity and a current estimation value under the parameter change, and enabling the current estimation value and the reference current at the next moment to be input into a non-differential-beat current prediction controller; and finally, carrying out compensating onthe obtained voltage vector and the voltage compensation amount of the dq axis at the current moment, carrying out coordinate transformation, space vector modulation and inversion, and obtaining a three-phase voltage to the permanent magnet synchronous motor, so that the stable operation of the motor is ensured. According to the method and the system disclosed by the invention, fractional order calculus and sliding mode variable structure control are combined, the fractional order calculus has more freedom degree, and the shaking of the system in the sliding mode process can be weakened, so that the control precision of the rotating speed is improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to a FOSMC-based permanent magnet synchronous motor predictive current control method, and also to a FOSMC-based permanent magnet synchronous motor predictive current control system. Background technique [0002] In the AC speed control system, the permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) as the controlled object has the advantages of simple structure, wide speed range, high efficiency, reliable operation, small size, and good dynamic and static characteristics. The permanent magnet synchronous motor control system is a strongly coupled and changeable nonlinear system. At present, most of the PMSM speed control systems use the PI control algorithm, which has the advantages of simple algorithm, high reliability and convenient speed control, and can meet the requirements within a certain range. The advantages of control ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a FOSMC-based permanent magnet synchronous motor predictive current control method, which solves the problems of slow dynamic response speed and low robustness of existing control methods

Images