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Current constraint-containing dual-vector model forecast control method of linear induction motor

A linear induction motor, model predictive control technology, applied in vector control system, motor generator control, AC motor control, etc., can solve problems such as large current fluctuations

Active Publication Date: 2018-11-23
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] The traditional single-vector model predictive control algorithm, because one switching cycle acts on one voltage vector, although the switching frequency is low, it will cause large current fluctuations

Method used

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  • Current constraint-containing dual-vector model forecast control method of linear induction motor
  • Current constraint-containing dual-vector model forecast control method of linear induction motor
  • Current constraint-containing dual-vector model forecast control method of linear induction motor

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Embodiment Construction

[0071] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0072] 1. Establishment of the linear induction motor mathematical model in the αβ coordinate system

[0073] Due to the broken structure of the iron core, the linear induction motor, such as figure 1 As shown, the edge effect is generated, which causes the mutual inductance to change during the operation of the motor. To describe this change in mutual inductance, the variables are defined as ...

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Abstract

The invention provides a dual-vector model forecast control method of a linear induction motor. Relatively good current quality can be obtained by employing the dual-vector control method. During thestarting and braking process of the motor, the current probably and instantaneously becomes large to generate overcurrent in order to obtain rapid dynamic response speed. A current constraint condition is considered, and the overcurrent is prevented from being generated during the running process of the motor; and meanwhile, under considering the current constraint condition, the vector selectionprocess of a dual-vector model forecast control algorithm is simplified, and the calculation quantity of the algorithm is reduced.

Description

technical field [0001] The invention belongs to the technical field of linear induction motor control, and more specifically relates to a double vector model predictive control method with current constraints for a linear induction motor. Background technique [0002] Linear induction motors can directly generate linear motion without any motion conversion device, so they are used in urban rail transportation. Compared with the traditional rotary motor drive method, it does not need adhesive force drive, fast acceleration, strong climbing ability, small turning radius, flexible line selection, and a flat car body driven by a linear motor, which reduces the shield surface of the subway construction and reduces the Small system engineering cost. However, due to the breaking of the iron core of the linear motor, the edge effect is caused. The mutual inductance of the motor will change with the operating conditions of the motor. The control algorithm depends on the motor parame...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P25/062
CPCH02P21/14H02P25/062
Inventor 徐伟邹剑桥刘毅
Owner HUAZHONG UNIV OF SCI & TECH
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