Squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity

A technology for asynchronous motors and motor parameters, applied in motor generator control, electronic commutation motor control, electrical components, etc.

Inactive Publication Date: 2013-09-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0007] Aiming at how to avoid the problem of installing a speed sensor or designing a flux linkage observer in the online identification process of traditional asynchronous motor parameters, the present invention proposes a squirrel-cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical quantities

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  • Squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity
  • Squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity
  • Squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity

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Embodiment Construction

[0075] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0076] A squirrel-cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical quantities, characterized in that the method specifically includes the following steps:

[0077] Step 1: Based on the asynchronous motor voltage equation and flux linkage equation in the dq0 coordinate system, a motor parameter identification model in the form of the least square method is obtained; the asynchronous motor voltage equation and flux linkage equation in the dq0 coordinate system are:

[0078] u sd = pψ sd ...

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Abstract

The invention discloses a squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity and belongs to the field of on-line identification of squirrel cage asynchronous motor parameters. The squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity does not depend on a velocity sensor and a motor flux observer does not need to be designed. The voltage data and the current data of a stator of a motor are measured directly, a motor parameter identification model based on a least square method under a dq0 coordinate system is adopted, parameters of the stator and a rotor of an asynchronous motor equivalent circuit can be identified on line through a recursion augmentation least squares algorithm on the basis that the factors which influence identification precision are fully considered. The squirrel cage asynchronous motor equivalent circuit parameter identification method based on measurable electrical capacity is simple in algorithm, small in calculated amount and suitable for on-line identification of the motor parameters. Therefore, the purpose that the real-time parameters of the motor are accurately obtained is achieved.

Description

technical field [0001] The invention belongs to the field of on-line identification of parameters of a squirrel-cage asynchronous motor, in particular to a method for identifying equivalent circuit parameters of a squirrel-cage asynchronous motor based on measurable electrical quantities. Background technique [0002] An important method for online evaluation of the energy efficiency of the motor system is the equivalent circuit method, which uses the parameters of the equivalent circuit of the asynchronous motor to solve the internal losses of the motor, and then estimates the total internal loss of the motor and the operating efficiency of the motor. In order to use this method to accurately evaluate the energy efficiency, the first problem that needs to be solved is the online identification of the motor equivalent circuit parameters, and then use the identified parameters to complete the online dynamic evaluation of the motor energy efficiency. Common methods for online ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 刘晓芳杜中兰赵海森王庆
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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