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A Stability Analysis Method of Single-phase Pulse Rectifier on EMU Network Side Based on Floquet Theory

A technology of pulse rectification and analysis method, applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., can solve problems such as difficulty in finding Lyapunov functions

Inactive Publication Date: 2019-09-10
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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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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  • A Stability Analysis Method of Single-phase Pulse Rectifier on EMU Network Side Based on Floquet Theory
  • A Stability Analysis Method of Single-phase Pulse Rectifier on EMU Network Side Based on Floquet Theory
  • A Stability Analysis Method of Single-phase Pulse Rectifier on EMU Network Side 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 method for analyzing the stability of a single-phase pulse rectifier on the side of a motor train network based on the Floquet theory. The mathematical model under the dq coordinate system of the phase pulse rectifier establishes a time-domain nonlinear dynamic average model; based on the time-domain nonlinear dynamic average model, the Jacobian matrix of the periodic solution is obtained; finally, the stability of the DC side parameters is analyzed according to the Floquet theory, and the plot System Nyquist plot. The invention uses a time-domain nonlinear model to make the system model clear and concise; based on the Floquet theory, it is obtained that the parameters of the DC side of the single-phase pulse rectifier at the side of the bullet train network will affect 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 Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘志刚陈红喻文倩
Owner SOUTHWEST JIAOTONG UNIV