Permanent-magnet synchronous motor sliding mode control system having gain-scheduling switching gain

Abstract

The present invention relates to a permanent-magnet synchronous motor sliding mode control system having a gain-scheduling switching gain. The control system carries out real-time setting on a switching gain of a stator current sliding mode control system of a permanent-magnet synchronous motor based on a method of combination of a switching gain and self-adaption. According to the method, the boundary range of the switching gain coefficient is adjusted according to an adaptive law; and gain scheduling is carried out on the switching gain coefficient within an allowed boundary range by using an integral sliding mode function related to direct-axis and alternating-axis currents as a scheduling variable. With the design method, on the premise that the robustness of the control system is guaranteed, the system buffeting is reduced and the control performance is improved.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor sliding mode control system with gain scheduling switching gain. Background technique [0002] Thanks to the successful development of new rare earth permanent magnet materials, the performance of permanent magnet synchronous motors has been qualitatively improved and has been widely used in many fields; permanent magnet synchronous motors are a multivariable, nonlinear, and strongly coupled system. It is extremely sensitive to the perturbation of internal parameters of the system and external disturbances, so the traditional linear control method cannot accurately describe the steady state and dynamic process of the system, nor can it adapt to the changes of system parameters, so it is difficult to ensure the stability of the motor within the global speed and torque range. running quality. [0003] Sliding mode control is a special nonlinear control, which has the advantages of fast respon...

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Problems solved by technology

[0002] Thanks to the successful development of new rare earth permanent magnet materials, the performance of permanent magnet synchronous motors has been qualitatively improved and has been widely used in many fields; permanent magnet synchronous motors are a multivariable, nonlinear, and strongly coupled system. It is extremely sensitive to the perturbation of internal parameters of the system and external disturbances, so the traditional linear control method cannot accurately describe the steady state and dynamic process of the system, nor can it adapt to the changes of system parameters, so it is difficult to ensure the stability of the motor within the global speed and torque range. running quality

[0003] Sliding mode control is a special nonlinear control, which has the advantages of fast response, good robustness, and strong engineering practicability; however, the sliding mode control system will have chattering problems, and the source of chattering is mainly the switching gain , chattering can be eliminated if the switching gain is properly adjusted in the process of approaching the sliding mode surface

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