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Stability analysis method of single-phase voltage source based on Jacobi theory

A single-phase voltage, analysis method technology, applied in the direction of irreversible AC power input conversion to DC power output, electrical components, electrical digital data processing, etc. Analyze accurate results

Inactive Publication Date: 2019-08-16
SOUTHWEST JIAOTONG UNIV
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  • Claims
  • 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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  • Stability analysis method of single-phase voltage source based on Jacobi theory
  • Stability analysis method of single-phase voltage source based on Jacobi theory
  • Stability analysis method of single-phase voltage source based on Jacobi theory

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Taking the single-phase voltage source rectifier as an example to illustrate the method of the present invention, the specific process is as follows:

[0046] Step 1: Establish the mathematical model of the pulse rectifier on the side of the EMU network in the dq coordinate system; 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, and the rectifier will input the single The phase-to-phase AC voltage is transformed into a stable DC voltage; by writing Kirchhoff's first and second law KCL and KVL equations for the AC side and the DC side respectively, the mathematical model of the pulse rectifier on the EMU side in the dq coordinate system is obtained .

[0047]

[0048] In the formula: L n is the...

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Abstract

The invention discloses a stability analysis method of a single-phase voltage source based on the Jacobi theory. The method is characterized by, to begin with, establishing a mathematical model of a single-phase voltage source rectifier under a dq coordinate system; then, establishing a time domain nonlinear dynamic average model according to the mathematical model of the single-phase voltage source rectifier under the dq coordinate system; solving a steady-state operating point based on the mathematical model of the single-phase voltage source rectifier under the dq coordinate system; and finally, calculating the characteristic value of the system according to the Jacobi theory, and judging the stability of the system by utilizing a root locus method. The method adopts a time domain nonlinear model to make the system model clear and concise; and bullet train network side parameters and rectifier DC side parameters obtained based on the root locus method can affect the stability of thesystem.

Description

technical field [0001] The invention relates to the technical field of single-phase voltage source rectifiers, in particular to a stability analysis method for single-phase voltage sources based on the Jacobian theory. Background technique [0002] With the application of a large number of power electronic components, the single-phase voltage source rectifier has become a very complex nonlinear system, and at the same time it has brought some new problems. Recently, more and more attention has been paid to the single-phase voltage source rectifier especially its 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 voltage source rectifiers. Huang Meng et al. analyzed the instability phenomenon of three-phase VSC, but it is not clear whether single-phase VSC will be unstable. Therefore, the stability analysis of single-phase VSC is neces...

Claims

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Application Information

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IPC IPC(8): H02M7/04G06F17/50
CPCH02M7/04H02M1/0012G06F30/20
Inventor 刘志刚陈红喻文倩
Owner SOUTHWEST JIAOTONG UNIV
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