Stability analysis method of bullet train unit network side single-phase pulse rectifier based on Floquet theory

A technology of pulse rectification and EMUs, which is applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., and can solve problems such as difficult to find Lyapunov functions

Inactive Publication Date: 2019-07-16
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The Lyapunov stability analysis method is mainly used to design controllers, and it is difficult to find a suitable Lyapunov function; the description function method is an equivalent linearization method to study the stability of nonlinear control systems from the perspective of the frequency domain, which is not applicable here

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  • Stability analysis method of bullet train unit network side single-phase pulse rectifier based on Floquet theory
  • Stability analysis method of bullet train unit network side single-phase pulse rectifier based on Floquet theory
  • Stability analysis method of bullet train unit network side single-phase pulse rectifier based on Floquet theory

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Taking the single-phase pulse rectifier on the EMU network side as an example to illustrate the method of the present invention, the specific process is as follows:

[0045] Step 1: Establish a mathematical model of the single-phase pulse rectifier on the EMU network side in the dq coordinate system.

[0046] For the two-level topology, the pantograph takes the current from the catenary, and after being stepped down by the on-board transformer, it is used as the input of the rectifier. The rectifier converts the input single-phase AC voltage into a stable DC voltage; Write down the equations of Kirchhoff's first and second laws KCL and KVL, and obtain the mathematical model in the dq coordinate system of the single-phase pulse rectifier on the EMU network side.

[0047]

[0048] In the formula: is the equivalent leakage ind...

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Abstract

The invention discloses a stability analysis method of a bullet train unit network side single-phase pulse rectifier based on a Floquet theory. The stability analysis method comprises the steps that firstly, establishing a mathematical model under a dq coordinate system of the bullet train unit network side single-phase pulse rectifier; establishing a time domain nonlinear dynamic average model according to the mathematical model under the dq coordinate system of the bullet train unit network side single-phase pulse rectifier; solving a Jacobian matrix of the periodic solution based on the time domain nonlinear dynamic average model; and finally, analyzing the stability of the direct current side parameters according to a Floquet theory, and drawing a system Nyquist diagram. A time domainnonlinear model is applied, so that a system model is clear and concise; based on the Floquet theory, the DC side parameters of the network side single-phase pulse rectifier of the motor train unit can influence the stability of the periodic system.

Description

technical field [0001] The invention relates to the technical field of single-phase pulse rectifiers on the train network side, in particular to a stability analysis method for single-phase pulse rectifiers on the train network side based on the Floquet theory. Background technique [0002] With the application of a large number of power electronic components, the single-phase pulse rectifier on the grid side of the EMU has become a very complex nonlinear system, and at the same time it also brings some new problems. Recently, more and more attention has been paid to single-phase pulse rectifiers on the grid side of EMUs, especially their stability. Although many studies have been devoted to the stability analysis of three-phase voltage source rectifiers, little attention has been paid to the stability analysis of single-phase pulse rectifiers on the EMU network side. Huang Meng et al. analyzed the instability phenomenon of three-phase VSC, but it is not clear whether singl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘志刚陈红喻文倩
Owner SOUTHWEST JIAOTONG UNIV
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