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Method for online computing motor optimal operating point

A calculation method and technology of working points, which are applied in the control of generators, motor generators, electronic commutation motor control, etc., can solve the problems of complex implementation, large amount of calculation, and time-varying motor parameters.

Inactive Publication Date: 2014-05-28
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology

The above-mentioned traditional calculation methods have a large amount of calculation and complex implementation, and are limited to time-varying motor parameters, so the performance is difficult to meet the requirements

Method used

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  • Method for online computing motor optimal operating point
  • Method for online computing motor optimal operating point
  • Method for online computing motor optimal operating point

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] An online calculation method for the best working point of the motor of the present invention combines the idea of ​​efficiency optimization control based on model loss and the idea of ​​minimum stator current control, and obtains the corresponding slip frequency when the asynchronous motor is at the best working point; and Aiming at the time-varying characteristics of motor parameters, a set of optimal slip frequency calculation methods based on motor model prediction is established, and a complete set of online calculation methods for the optimal operating point of asynchronous motors is formed.

[0031] In the present invention, the derivation process of the corresponding slip frequency (that is, the optimal slip frequency) when the asynchronous motor is at the optimal operating point is:

[0032] In the synchronous rotating...

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Abstract

The invention discloses a method for online computing a motor optimal operating point. Online computing on the optimal operating point of an asynchronous motor is completed through optimal slip frequency corresponding to the optimal operating point of the asynchronous motor. The optimal slip frequency w2_max is obtained by the following formula, Rs represents stator resistance, Rr represents rotor resistance, and Lm represents mutual inductance. The method has the advantages of being high in real-time performance, high in precision, good in system stability, strong in anti-interference capacity and the like.

Description

technical field [0001] The invention mainly relates to the technical field of motor control, in particular to an online calculation method for an optimal working point suitable for an asynchronous motor. Background technique [0002] The asynchronous motor works at different operating points, and its operating efficiency is not the same. In order to make the motor work at the operating point with optimized efficiency for a long time, the motor must work at the optimal operating point. Since the motor parameters will be affected by the change of operating temperature, the optimal operating point will change accordingly, so accurate calculation is required. [0003] At present, the online calculation methods of the optimal operating point can be roughly classified into three categories: the optimal excitation control strategy based on the loss model, the minimum input power control strategy and the minimum stator current control strategy. The efficiency optimization control b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 冯江华尚敬周桂法梅文庆周志宇刘勇甘韦韦江平
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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