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An Inductor Identification Method Based on Current Ripple

A technology of current ripple and identification method, which is applied in the field of online parameter identification of permanent magnet synchronous motors, can solve the problems of permanent magnet synchronous motor instability, identification model dissatisfaction of rank, etc., reduce motor loss and rotor vibration, and avoid adverse effects , Reduce the effect of current distortion and torque ripple

Active Publication Date: 2022-07-12
SOUTHEAST UNIV
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Problems solved by technology

Using this identification model causes the existing identification technology to have the following problems: since there are four unknown parameters in the two equations of the d-axis and the q-axis (d-axis inductance L d , q-axis inductance L q , resistance R, permanent magnet flux linkage ψ f ), so when performing parameter identification, you will encounter the problem that the identification model is not rank-satisfactory
In severe cases, it may even destabilize the permanent magnet synchronous motor

Method used

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  • An Inductor Identification Method Based on Current Ripple
  • An Inductor Identification Method Based on Current Ripple
  • An Inductor Identification Method Based on Current Ripple

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Embodiment Construction

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037]The invention proposes an on-line identification technology of permanent magnet synchronous motor inductance based on current ripple. This technology uses the current ripple inherent in the permanent magnet synchronous motor drive system to perform inductance identification, and does not need to inject high-frequency voltage or current signals into the permanent magnet synchronous motor as in the prior art. Compared with the pr...

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Abstract

The invention discloses an inductance identification method based on current ripple, which belongs to the field of online parameter identification of permanent magnet synchronous motors. The identification technology proposed by the present invention completes the sampling of the current ripple of the permanent magnet synchronous motor control system, the processing of the sampling results of the current ripple, and the use of the current ripple to detect the inductance through the cooperation of three continuous control cycles in the digital controller. Perform online identification. The identification technology proposed in the present invention utilizes multiple consecutive sampling and least square fitting to improve the accuracy of current ripple sampling, and utilizes current ripple information through a simplified identification model. Compared with the prior art, the technology proposed by the present invention does not need to inject high-frequency voltage or current signals into the motor, thereby reducing the current distortion and torque fluctuation of the permanent magnet synchronous motor control system, and reducing the motor loss and rotor vibration. .

Description

technical field [0001] The invention relates to the field of online parameter identification of permanent magnet synchronous motors, in particular to an inductance identification method based on current ripple. Background technique [0002] Among the many control algorithms of permanent magnet synchronous motors, such as various current control algorithms, maximum torque to current ratio control algorithms, field weakening control algorithms, position sensorless control algorithms, etc., the inductance value of the dq synchronous coordinate system (L d , L q ) play an important role. To ensure the performance of these control algorithms, online parameter identification techniques are used to obtain accurate L d , L q becomes particularly critical. [0003] The existing on-line identification technology of permanent magnet synchronous motor parameters all use "dq-axis discrete electromagnetic equation with control period as discrete period" as identification model. Using...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P25/022
CPCH02P21/14H02P21/0003H02P25/022H02P2207/05
Inventor 黄允凯张津栋彭飞
Owner SOUTHEAST UNIV
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