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Improved dead-beat prediction current control method for permanent magnet synchronous motor

A permanent magnet synchronous motor, a technology for predicting current, applied in motor control, motor generator control, AC motor control, etc. Effects of current ripple and torque following

Active Publication Date: 2020-12-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, high temperatures may lead to an increase in the resistance of the stator resistance while reducing the rotor flux linkage by demagnetizing the permanent magnets, which may lead to torque ripple and torque following deviation

Method used

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  • Improved dead-beat prediction current control method for permanent magnet synchronous motor
  • Improved dead-beat prediction current control method for permanent magnet synchronous motor
  • Improved dead-beat prediction current control method for permanent magnet synchronous motor

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Embodiment Construction

[0066] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0067] The improved deadbeat predictive current control method of the permanent magnet synchronous motor provided by the present invention, such as figure 1 As shown, it specifically includes the following steps:

[0068] Step 1, establish a simplified mathematical model of the permanent magnet synchronous motor under the dq coordinate system, and derive the corresponding equation of the prediction stator current update mechanism;

[0069] Step 2: Discretize the stator voltage equation corresp...

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Abstract

The invention relates to an improved dead-beat prediction current control method for a permanent magnet synchronous motor. The method comprises the following steps of firstly, establishing a new current updating mechanism to obtain new prediction current and voltage equations, then deriving a prediction current error formula according to the dead-beat prediction current control method, further decoupling stator inductance, decoupling rotor flux linkage by utilizing the voltage formula, and finally obtaining the dead-beat prediction current of the permanent magnet synchronous motor. Then, inductance and flux linkage parameters are subjected to online parameter identification based on a forgetting factor least square method, estimator errors are predicted and corrected, filtered stator inductance and rotor flux linkage can effectively restrain generation of current ripples and torque following deviation, power loss is reduced. The method is easy and convenient to operate, ideal in effectand suitable for popularization and application; the number of calculation times is effectively reduced, accuracy of parameter identification can be effectively improved, and a problem that the motorperformance is reduced due to continuous change of motor parameters in the operation process is solved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a current update mechanism and a technology for online identification of surface-mounted permanent magnet synchronous motor inductance and flux linkage based on the forgetting factor recursive least squares method. Background technique [0002] The high-performance control design of PMSM needs to meet precise demands on motor parameters, such as stator inductance, magnetic flux, stator resistance, rotor inertia, and viscous friction coefficient. However, many factors limit the availability of all precise motor parameters for PMSMs. Although the nominal parameters of the PMSM can be used for control design, this parameter is non-linearly dependent on the operating environment (e.g. temperature) and operating conditions (e.g. speed and load torque). For example, high temperature can cause an increase in the resistance value of the stator resistan...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/14H02P21/22H02P25/022
CPCH02P21/0003H02P21/14H02P21/141H02P21/22H02P25/022H02P2207/055
Inventor 张硕周莹张承宁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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