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Position Sensorless Control of PMSM Based on Improved Sliding Mode Observer

A technology of sliding mode observer and control method, which is applied in control system, generator control, motor control, etc., can solve the problems of low robustness of the system and large chattering of observation signals, so as to improve robustness and reduce Small influence, effect of suppressing chattering phenomenon

Inactive Publication Date: 2019-01-08
XIAN UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a PMSM position sensorless control method based on an improved sliding mode observer. Based on the improved sliding mode observer, the external torque disturbance and the internal resistance parameter change are identified at the same time, which solves the problem of the existing sliding mode observation. The chattering phenomenon of the observation signal in the controller is relatively large, low-pass filtering and rotor angle compensation are required, and the system robustness is not high

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  • Position Sensorless Control of PMSM Based on Improved Sliding Mode Observer
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  • Position Sensorless Control of PMSM Based on Improved Sliding Mode Observer

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[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the specific embodiments.

[0055] The present invention is based on the PMSM position sensorless control method of the improved sliding mode observer, including the improved sliding mode observer based on the sigmoid function, the stator resistance identification link, the counter electromotive force observer and the torque observer.

[0056] refer to figure 1 , the improved sliding mode observer of the present invention is applied in the vector control of permanent magnet synchronous motor. The control method adopts i d = 0 control, the three-phase current and voltage of the permanent magnet synchronous motor are transformed by Clarke to obtain the component i in the two-phase stationary coordinate system α i β and u α , u β As the input of the improved sliding mode observer, the speed ...

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Abstract

A PMSM sensorless control method based on an improved sliding mode observer is disclosed. The sigmoid function with variable boundary layer thickness is used to replace the sign function, The back-EMFobserver is constructed to separate the back-EMF signal, which eliminates the low-pass filter and phase compensation. The observer gain can be adjusted dynamically with the speed, and the chatteringphenomenon of the sliding-mode observer can be restrained effectively and the ideal observation precision in the wide speed range can be obtained. The on-line identification of stator resistance and torque observation are added to the improved sliding mode observer, which improves the robustness of the system to internal and external parameter changes.

Description

technical field [0001] The invention belongs to the technical field of motor position sensorless control, in particular to a PMSM position sensorless control method based on an improved sliding mode observer. Background technique [0002] Permanent magnet synchronous machines (PMSM) have the advantages of high power density, high efficiency, and simple structure, so they have been widely used in industrial fields. [0003] In order to accurately control the permanent magnet synchronous motor, the position information and speed information of the rotor are needed, so a position sensor needs to be installed on the motor shaft. But it will increase the cost and complexity of the system and reduce the reliability of the system. Therefore, the position sensorless control of permanent magnet synchronous motor has become a research hotspot. [0004] At present, the position sensorless control strategies of permanent magnet synchronous motors can be mainly divided into two categor...

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Application Information

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IPC IPC(8): H02P21/24H02P21/13H02P21/00H02P25/022
CPCH02P21/0007H02P21/13H02P25/022H02P2207/05H02P21/24H02P25/024
Inventor 周长攀唐伟孙向东周兆吉
Owner XIAN UNIV OF TECH
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