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Low-frequency oscillation inhibition method of high-speed train based on sliding mode control of extended state observer

An expansion state, low-frequency oscillation technology, applied in the field of high-speed rail power supply, can solve the problem that the control effect is difficult to improve

Inactive Publication Date: 2019-06-14
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The control effect of the traditional linear control method has been difficult to improve, so it is necessary to introduce nonlinear control methods, such as predictive control, passive control and sliding mode control, into the control of the converter

Method used

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  • Low-frequency oscillation inhibition method of high-speed train based on sliding mode control of extended state observer
  • Low-frequency oscillation inhibition method of high-speed train based on sliding mode control of extended state observer
  • Low-frequency oscillation inhibition method of high-speed train based on sliding mode control of extended state observer

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Embodiment Construction

[0102] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment takes the CRH5 type EMU as an example.

[0103] Step A: Define the grid-side current orthogonal quantity, and construct the state space model of the grid-side rectifier of the EMU in the d-q rotating coordinate system.

[0104] The rectifier on the EMU network side adopts a four-quadrant pulse rectifier, and this patent is aimed at a single-phase two-level topology. The pantograph takes current from the catenary, and after being stepped down by the on-board transformer, it is used as the input of the rectifier, and the rectifier converts the input single-phase AC voltage into a stable DC voltage.

[0105] The AC side current i n expressed as i α , AC side electromotive force e n expressed as u α , constructed with i α , u α Orthogonal virtual quantity i β 、e β , according to the principle of equal power transfor...

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Abstract

The invention discloses a low-frequency oscillation inhibition method of a high-speed train based on sliding mode control of an extended state observer. The method comprises the steps of constructinga state space model of a net side rectifier of the high-speed train, establishing the extended state observer on the state space model by taking load change as disturbance to obtain an estimated loadpower value, selecting an output of a control system by combining a control objective, establishing two sliding mode faces based on outer ring voltage control, obtaining a reactive component referencevalue of net side current by combining the estimated load power value, completing calculation of a sliding mode face expression, calculating a switching function, multiplying the switching function with direct current side voltage to obtain control voltage, transforming the control voltage into an alpha-beta coordinate system component, and outputting control pulse by sine pulse width modulation.The method takes all external disturbance as one state variable, so that the direct current side voltage can keep constant under sudden change of a load; the net side current can have a low total harmonic distortion rate; and the electric energy quality and the stability of a train net coupled system can be ensured.

Description

technical field [0001] The invention relates to the technical field of high-speed rail power supply, in particular to a high-speed rail low-frequency oscillation suppression method based on extended state observer sliding mode control. Background technique [0002] With the rapid development of China's high-speed rail, high-speed, heavy-duty, and high-density have become important characteristics of electrified railways. Therefore, higher and higher requirements are placed on the reliability of high-speed rail power supply. More and more new AC / DC / AC transmission locomotives have been put into operation, which greatly increases the complexity of the traction power supply system. The low-frequency oscillation phenomenon of the traction power supply system in my country is produced under such a background. Instability caused by matching. Many research results have shown that the control strategy of the grid-side rectifier is an important factor affecting the stability of the v...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02J3/00
Inventor 刘志刚刘爽
Owner SOUTHWEST JIAOTONG UNIV
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