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Traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control

An exponential approaching, low-frequency oscillation technology, applied in the control of electromechanical brakes, control systems, control generators, etc., can solve uneconomical problems, achieve suppression of low-frequency oscillations, improve system control quality, good tracking quality and robust characteristics Effect

Pending Publication Date: 2021-12-28
HUNAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, it is difficult and uneconomical to change the parameters of the traction network side, and improving the electrical parameters of the EMU has become the main means of suppressing low-frequency oscillations

Method used

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  • Traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control
  • Traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control
  • Traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0065] refer to Figure 1-Figure 10 , the present invention is a kind of traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control, comprising the following steps:

[0066] Step 1: Create a voltage sliding mode control model, introduce an exponential reaching law, and select the error of the DC side output voltage as the sliding mode surface;

[0067] Step 2: Prove the asymptotic stability of the voltage s...

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Abstract

The invention discloses a traction network low-frequency oscillation suppression method based on exponential reaching law sliding mode control, and the method comprises the steps: creating a voltage sliding mode control model, introducing an exponential reaching law, and selecting an error of a DC side output voltage as a sliding mode surface; proving the asymptotic stability of the voltage sliding mode control model created in the step 1 through a Lyapunov function; creating a current inner loop controller; creating sliding mode control modes based on the exponential reaching law. According to the traction network oscillation suppression method based on the exponential reaching law sliding mode control, the problems that a linear PI controller is low in response speed and large in overshoot are well solved, the tracking quality and the robust characteristic are good, the exponential reaching law is introduced to eliminate the buffeting problem of sliding mode control, the state variable can smoothly reach the sliding mode surface in finite time, and the control quality of the system is improved.

Description

technical field [0001] The invention relates to the technical field of electrified railway systems, in particular to a method for suppressing low-frequency oscillation of a traction network based on exponential reaching law sliding mode control. Background technique [0002] In recent years, low-frequency oscillations of electrified railways have occurred frequently, and the oscillation frequency is mainly concentrated at 3-7Hz, and most of them occur at the time when multiple EMUs of the same type are raised and prepared at the same time in the same traction power supply section, resulting in traction blockade of EMUs, which seriously threatens For the safe and stable operation of the electrified railway system, the low-frequency oscillation of the electrified railway has become a typical electrical coupling problem between trains and networks. In order to prevent low-frequency oscillation from happening again, it is imminent to study its suppression measures. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02M5/458H02P21/14H02P21/18H02P21/22H02P27/12
CPCH02J3/241H02M5/4585H02P21/0007H02P21/14H02P21/18H02P21/22H02P27/12
Inventor 兰征胡颖新曾进辉刁伟业何东邹彬黄浪尘
Owner HUNAN UNIV OF TECH
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