Automatic linear induction traction motor parameter identification method for general frequency converter

Abstract

The invention relates to an automatic linear induction traction motor parameter identification method for a general frequency converter, which comprises the steps: a linear induction motor is firstly subjected to equivalence to form a dq model and simultaneously, a mathematic model of the converter is considered in the dq model of the linear induction motor; primary parameters of the linear induction motor are obtained through traditional no-load and an experimental method of introducing direct current, and then, based on the situation that a secondary leakage inductance is not equal to a primary inductance, mutual inductance is obtained by solving a third-order polynomial directly in an equivalent inductance of the entire circuit, so that the primary leakage inductance and the secondary leakage inductance can be solved respectively, the methods for identifying the parameters of the linear inductance motor and the parameters of a rotary inductance motor are united by defining the formula as follows: beta = Lm / Lr, so that different types of motors and parameters thereof can be identified by selecting different beta values, that is to say, accurate parameters can be obtained regardless of the linear inductance motor or the rotary inductance motor.

Description

Automatic identification method of linear induction traction motor parameters for general frequency converter technical field The invention relates to an identification method of motor parameters, in particular to an automatic identification method of a traction linear induction motor used for a general frequency converter, and belongs to the technical field of electric transmission. Background technique At present, the frequency converters that drive induction motors all adopt vector control or direct torque control methods. The control performance of these methods directly depends on the motor parameter acquisition method and the accuracy of the obtained motor parameters, so accurate motor parameters are very important for obtaining High-performance control is a crucial factor. In the existing technology, represented by Siemens and ABB, their high-end inverters have the function of automatically identifying the parameters of the driven induction motor, that is, the inve...

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Problems solved by technology

In the existing technology, represented by Siemens and ABB, their high-end inverters have the function of automatically identifying the parameters of the driven induction motor, that is, the inverter automatically runs the identification program module after connecting the motor, and can obtain the motor parameters required by the control strategy , but these motor parameter identification methods in the prior art are limited to the parameter identification of rotary induction motors, and are not applicable to linear induction motors

The main reason why the frequency converter in the prior art cannot identify the parameters of the linear induction motor is that its identification method only considers the mathematical model of the rotary induction motor, and does not involve the special physical phenomena of the linear induction motor, let alone find out the difference between the two. relationship between

For example, the existing method for parameter identification of rotating induction motors assumes that the armature leakage inductance and rotor leakage inductance of the rotating induction motor are equal, but the secondary of the linear induction motor does not have a squirrel cage bar similar to the rotating induction motor and shorting ring, its secondary leakage inductance is much smaller than the primary leakage inductance

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