Method for determining stator flux linkage of dual-mode voltage model

A technology of stator flux linkage and voltage model, which is used in electronic commutation motor control, electrical components, control generators, etc. question

Active Publication Date: 2020-01-03
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: at present, high-precision flux linkage values ​​cannot be obtained in the full speed range through existing methods, which makes it difficult to realize the engineering of the speed sensorless motor control system

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  • Method for determining stator flux linkage of dual-mode voltage model
  • Method for determining stator flux linkage of dual-mode voltage model
  • Method for determining stator flux linkage of dual-mode voltage model

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Embodiment Construction

[0050] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0051] The voltage model method is the basic method for observing the stator flux linkage in the AC speed control system. Because of its simple algorithm and small dependence on the motor parameters (only the stator resistance parameter is required), the voltage model flux linkage observation method has been paid attention to by people. Especially in control systems without speed sensors.

[0052] The contro...

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Abstract

The invention discloses a method for determining a stator flux linkage of a dual-mode voltage model. The method comprises the steps of determining a stator flux linkage at the current moment accordingto a stator flux linkage correction value at the previous moment of the current moment: obtaining the stator flux linkage correction value at the previous moment, and determining a stator angular velocity at the current moment according to the stator flux linkage correction value; selecting one of the first voltage and the second voltage as a stator input voltage at the current moment according to the stator angular velocity at the current moment; obtaining a stator flux linkage at the current moment based on a preset filter coefficient, the stator flux linkage at the previous moment and theselected stator input voltage at the current moment; and correcting the stator flux linkage at the current moment based on a preset stator flux linkage amplitude correction coefficient and a preset stator flux linkage phase correction angle, and outputting a stator flux linkage correction value at the current moment. According to the method, a high-precision stator flux linkage value can be obtained in a full-speed range, so that the engineering application of most speed sensorless motor control systems can be met.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for determining stator flux linkage in a dual-mode voltage model. Background technique [0002] In a speed sensorless AC motor control system, the voltage model is considered to be difficult to work at very low speeds. Because the output voltage of the voltage model is close to zero at this time, and due to the interference of sampled current noise zero drift and stator resistance changes, the effective voltage signal is submerged in noise interference, resulting in the inability to correctly calculate the flux linkage of the motor. Various advanced control algorithms such as Field Oriented Control (FOC) or Direct Torque Control (DTC) will not work properly. Therefore, the calculation accuracy of flux linkage in the full speed range must be improved in order to popularize the effective control without speed sensor. [0003] In the current AC drive system, many co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/28
CPCH02P21/141H02P21/28
Inventor 杨大成梅文庆王挺泽周志宇丁晓帆
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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