A Disturbance Suppression Method for Permanent Magnet Synchronous Motor in Field Weakening Control Mode

Abstract

A disturbance suppression method under the field-weakening control mode of a permanent magnet synchronous motor, aiming at the deviation of the AC and D-axis currents from reference values ​​when parameters such as inductance, resistance, and flux linkage are disturbed under the field-weakening control mode of a permanent magnet synchronous motor drive system, The reduction of the torque following effect will lead to the increase of the motor response noise and affect the smooth operation of the motor. Combined with the stator current observation principle based on the sliding mode exponential reaching law control, the system disturbance caused by the parameter mismatch can be accurately observed, and then suppressed. The problem of motor running instability caused by disturbance can be solved, so as to improve the response of the motor. Compared with the traditional field weakening control research, the solution method in the parameter mismatch environment is introduced, which has many beneficial effects such as simple design and good dynamic and static following performance.

Description

technical field [0001] The invention relates to the field of disturbance suppression under the flux-weakening control mode of a permanent magnet synchronous motor, in particular to the observation and compensation of voltage disturbance under the mismatch of inductance, resistance and flux linkage in the flux-weakening mode of a permanent magnet synchronous motor. Background technique [0002] Due to the constant excitation strength of the permanent magnet of the permanent magnet synchronous motor, when the speed is greater than the base speed and the constant power operation area, the voltage saturation of the output voltage of the inverter will make the speed unable to increase further, thus limiting the application range. In order to overcome this problem, the field usually uses the control method of reducing the excitation current of the separately excited DC motor to increase the speed and combining the field weakening control technology to realize the large-scale perman...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of system disturbance caused by parameter mismatch in the existing permanent magnet synchronous motor under the field-weakening control mode, and especially for the change of inductance, resistance and flux linkage to generate voltage disturbance, the predictive control output deviates from the reference value and affects the smooth operation of the motor. Problem, the present invention provides a disturbance suppression method in the field weakening control mode of a permanent magnet synchronous motor, which specifically includes the following steps:

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