High ferro and low frequency oscillation suppression method based on sliding mode control

A low-frequency oscillation and sliding mode 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: 2018-01-09
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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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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  • High ferro and low frequency oscillation suppression method based on sliding mode control
  • High ferro and low frequency oscillation suppression method based on sliding mode control
  • High ferro and low frequency oscillation suppression method based on sliding mode control

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Embodiment Construction

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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 transform...

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Abstract

The invention discloses a high ferro and low frequency oscillation suppression method based on sliding mode control, comprising the steps of defining grid-side current orthogonal and establishing a state space model of a motor-car networking side rectifier under a dq rotating coordinate; selecting the output of a control system with the combination of a control object, and establishing two sliding-mode surfaces based on outer-ring voltage control, and obtaining a reference value of grid-side reactive component of current, and completing the calculating of a sliding-mode surface expression; selecting sliding mode control tendency rate for the two sliding mode surfaces, and substituting the two sliding mode surfaces into the sliding mode control tendency rate, and substituting the result into the state space model of a motor-car networking side rectifier under the dq rotating coordinate, obtaining a switch function, and multiplying the switch function with DC side voltage, obtaining control voltage; obtaining an Alfa Belta coordinate system component through the coordinate transformation of control voltage, and outputting control impulse through sine pulse width modulation. The invention is advantageous in that dynamic response and robustness of the rectifier can be effectively improved, and the low frequency oscillation of motor-car electrical quantities can be suppressed.

Description

technical field [0001] The invention relates to the technical field of high-speed rail power supply and relates to a method for suppressing low-frequency oscillation of high-speed rail based on 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 vehicle-grid system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02J3/00
Inventor 刘志刚刘爽耿照照王亚绮胡鑫烜
Owner SOUTHWEST JIAOTONG UNIV
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