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Method for establishing unified dq impedance model of high-speed train

An impedance model, the technology of high-speed trains, is applied in the conversion equipment of intermediate conversion to DC, the irreversible AC power input is converted into DC power output, and the reduction/prevention of power oscillation can solve the complex stability analysis of the vehicle network system. And other issues

Active Publication Date: 2021-08-27
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The differences in the impedance characteristics of different control trains and their interactions make the stability analysis of the train-network system more complicated, and the existing train impedance models are no longer applicable to this situation

Method used

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  • Method for establishing unified dq impedance model of high-speed train
  • Method for establishing unified dq impedance model of high-speed train
  • Method for establishing unified dq impedance model of high-speed train

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Embodiment Construction

[0026] The implementation steps of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Step 1. Design a method for impedance modeling in the dq domain. The single-phase electrical state variables of the train grid-side rectifier, such as the grid-side single-phase AC voltage u n , Grid side single-phase AC current i n and switch state quantity d n Etc is set as the α-axis component, and the corresponding β-axis component is virtualized, so that it lags behind the α-axis component by 90°, and then the αβ component is obtained, and then the dq decomposition is realized by using the Park change. where the grid-side voltage u n As a sinusoidal AC quantity, a -90° rotation angle is introduced into the Park transformation matrix to ensure that the d-axis component is equal to the magnitude of the AC quantity, as follows:

[0028]

[0029] In the formula, x represents the corresponding electrical state variabl...

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Abstract

The invention discloses a method for establishing a unified dq impedance model of a high-speed train, which considers complete structures of all control links in the modeling process to obtain a dq impedance model with higher accuracy. And when the transient direct current control train and the dq decoupling control train are connected in parallel at the same time, the established model with the dq impedance model of the existing dq decoupling control train are connected in parallel to obtain a train unified impedance model. Based on the model, the low-frequency stability of the system can be accurately analyzed by using a generalized Nyquist criterion.

Description

technical field [0001] The invention is applied to the field of low-frequency oscillation analysis of a coupling system of a train and a traction network in an electrified railway, and belongs to a method for establishing a small-signal mathematical model in the frequency domain of a power electronic device. Background technique [0002] In recent years, my country's electrified railways have developed rapidly, but instability problems such as low-frequency oscillations caused by the interaction between traction networks and power electronic devices in high-speed trains have occurred from time to time. To solve this problem, the frequency domain impedance method is widely used in the analysis and research of the low-frequency oscillation of the train-network system, in which the train impedance modeling mainly depends on the circuit structure and control strategy of the grid-side converter. At present, people only model and analyze the situation when a single type of train i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/36H02M5/44H02M7/12
CPCH02J3/241H02J3/381H02J3/36H02M5/44H02M7/12H02J2003/365H02J2203/20Y02E60/60
Inventor 孔睿王晓茹吕晓琴丁理杰
Owner SOUTHWEST JIAOTONG UNIV
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