Permanent magnet synchronous motor speed control method and device, computer equipment and medium

Abstract

The embodiment of the invention discloses a permanent magnet synchronous motor speed control method and device, computer equipment and a medium. The method comprises the steps of obtaining a voltage model flux linkage and a current model flux linkage of a permanent magnet synchronous motor in a static coordinate system, and determining a voltage model compensation voltage in the static coordinatesystem based on the voltage model flux linkage and the current model flux linkage; correcting the voltage model flux linkage based on the voltage model compensation voltage to obtain a corrected voltage model flux linkage; and determining rotor position information of the permanent magnet synchronous motor according to the current model flux linkage and the corrected voltage model flux linkage, and controlling the speed of the permanent magnet synchronous motor through the rotor position information. According to the technical scheme of the embodiment of the invention, the back electromotive force observation capability and flux linkage precision are improved, and the precision and robustness of speed estimation of the permanent magnet synchronous motor are improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of electrical control, and in particular to a speed control method, device, computer equipment and medium of a permanent magnet synchronous motor. Background technique [0002] Due to its compact structure and reliable performance, permanent magnet synchronous motors have been widely used in wind power generation, electric vehicles, ship drives and other fields. [0003] The vector speed regulation of the permanent magnet synchronous motor usually needs to detect or estimate the rotor position to control the voltage, current and speed. The traditional method is to install mechanical sensors to obtain rotor position and speed information as feedback to form closed-loop control. However, a high-precision mechanical position sensor will increase hardware costs and later maintenance costs, and will also reduce the reliability of the vector speed control system of the entire permanent m...

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Problems solved by technology

However, a high-precision mechanical position sensor will increase hardware costs and later maintenance costs, and will also reduce the reliability of the vector speed control system of the entire permanent magnet synchronous motor

[0004] Based on the traditional method, the speed of the permanent magnet synchronous motor is controlled based on the speed sensor, that is, the rotor position and speed are estimated by using a suitable estimation method without increasing the hardware cost. The current methods are: one is based on the motor The open-loop calculation method of the ideal model adopts the open-loop algorithm based on the mathematical model of the motor, such as the direct calculation method, the estimation method based on the inductance change, and the back electromotive force integration method. Although the calculation process is simple, it has a strong influence on the motor parameters. Dependence, when the parameters change or the system is in a dynamic change, it will affect the accuracy of the speed estimation results of the permanent magnet synchronous motor

The second is a closed-loop algorithm based on various observer models, such as extended Kalman filter, sliding mode observer, model reference adaptive algorithm, phase-locked loop algorithm based on back EMF and other adaptive algorithms, but various algorithms All have different limitations, coupled with other interference factors, cannot accurately estimate rotor speed and position

The third is the high-frequency injection identification algorithm. In the low-speed or even zero-speed condition of the motor, the high-frequency excitation signal is injected to obtain the rotor position information. If the filter is selected properly, a better identification effect can be obtained, but its calculation is complex and Filtering can easily cause the vector speed regulation system of the permanent magnet synchronous motor to lag behind, and at the same time cause high-frequency torque ripple and is not suitable for high-speed operation

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