Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

The Establishment Method of Unified dq Impedance Model for High-speed Train

An impedance model, the technology of high-speed trains, applied in the conversion equipment of intermediate conversion to DC conversion, irreversible AC power input to DC power output, power transmission AC network and other directions, can solve the complex stability analysis of the vehicle network system, etc. question

Active Publication Date: 2022-07-01
SOUTHWEST JIAOTONG UNIV
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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make the stability analysis of the train-network system more complicated, and the existing train impedance models are no longer applicable to this situation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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • The Establishment Method of Unified dq Impedance Model for High-speed Train
  • The Establishment Method of Unified dq Impedance Model for High-speed Train
  • The Establishment Method of Unified dq Impedance Model for High-speed Train

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

[0027] Step 1. Design a method for impedance modeling in the dq domain. Convert 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 Set the α-axis component as the α-axis component, and virtualize the corresponding β-axis component, so that it lags the α-axis component by 90°, thereby obtaining the αβ component and then using the Park change to achieve dq decomposition. Among them, let the grid side voltage u n For the sinusoidal alternating current, a rotation angle of -90° is introduced into the Park transformation matrix to ensure that the d-axis component is equal to the magnitude of the alternating current, as follows:

[0028]

[0029] In the formula, x represents the corres...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

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

Description

technical field [0001] The invention is applied to the low-frequency oscillation analysis field of a train and a traction network coupling system in an electrified railway, and belongs to a method for establishing a frequency domain small-signal mathematical model of a power electronic device. Background technique [0002] In recent years, my country's electrified railway has developed rapidly, but instability problems such as low-frequency oscillation caused by the interaction between the traction network and the power electronic devices in high-speed trains often occur. 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-to-grid 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 carry out modeling analysis for the situation when a single type of train is connected to th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com