High-speed-rail low frequency oscillation overvoltage damping method based on multi-variable control

A technology of multi-variable control and low-frequency oscillation, which is applied in adaptive control, general control system, control/regulation system, etc., and can solve problems such as the electrical quantity of the resonance link is not considered

Inactive Publication Date: 2016-01-06
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Comprehensive analysis of the above methods shows that some design methods are aimed at three-level rectifiers. In the design process of two-level rectifier control, the electrical quantity of the resonance link is not considered, and the traditional control method and its improvement are used, and modern control methods are not introduced. optimized control

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  • High-speed-rail low frequency oscillation overvoltage damping method based on multi-variable control
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  • High-speed-rail low frequency oscillation overvoltage damping method based on multi-variable control

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Embodiment

[0098] This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation process is given, but the protection scope of the present invention is not limited to the following embodiments.

[0099] This embodiment takes the CRH3 EMU as an example.

[0100] Such as figure 1 Shown, including the establishment of the state space model of the rectifier on the grid side of the EMU, the design of the multivariable feedback control matrix, the design of the state observer and the state observation matrix, the design of the set value calculation module, and the design of the feedforward control.

[0101] The process of analyzing actual measured current harmonics in this embodiment consists of the following steps.

[0102] A. Establishment of the state space model of the rectifier on the grid side of the EMU

[0103] Such as figure 2 As shown, the relationship between voltage and current on the AC side is as follows:

[0104]

[0105] T...

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Abstract

The invention discloses a high-speed-rail low frequency oscillation overvoltage damping method based on multi-variable control. The method comprises establishment of a bullet train networking side rectifier state space model, a design of a multivariable feedback control matrix, designs of a state observer and a state observation matrix, a design of a setting value calculating module and a design of feedforward control. The establishment of the state space model is a premise of realizing a control method. The state observer is used for estimating a voltage and a magnitude of current of a direct current link resonance portion, wherein the voltage and the magnitude of current are used for control calculating. A measurement apparatus does not need to be increased additionally. In the invention, a difference between an estimation value of a state amount and a setting value is organized and integrated via the multivariable feedback matrix; the multivariable feedback matrix is calculated and acquired through a linear quadratic optimal control algorithm and a contradiction between control input consumption and a control performance demand can be reasonably balanced. The feedforward control is used to further accelerate a dynamic response characteristic of the control. In addition, by using the control method, a problem of traction network-bullet train group electric quantity low frequency oscillation can be effectively restrained.

Description

Technical field [0001] The invention relates to automatic control, in particular to a control strategy for a rectifier on the grid side of a train. Background technique [0002] With the rapid development of high-speed railways, new “AC-DC-AC” electric locomotives have been widely used in electrified railway systems due to their high power factor, high power, and high traction. The traditional "AC-DC-AC" locomotive control methods are mainly divided into two categories, indirect current control and direct current control. Indirect current control is represented by "phase amplitude control", and direct current control includes hysteresis current control, predictive current control and transient current control. Transient direct current control is currently a more control strategy used in electric locomotives and high-speed EMUs. [0003] In order to improve the control performance of the locomotive line-side pulse rectifier, He Liqun et al. proposed a high-performance indirect cur...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 刘志刚向川张桂南姚书龙廖一橙
Owner SOUTHWEST JIAOTONG UNIV
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