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

Grid-connection control policy for motor train unit grid-side converter under network voltage fluctuation working condition

A grid-side converter and control strategy technology, applied in AC network voltage adjustment, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as frequency characteristic deviation of proportional resonant controllers, Achieve the effects of improving dynamic performance, ensuring safe and stable operation, and suppressing fluctuations in network voltage

Inactive Publication Date: 2016-08-24
BEIJING JIAOTONG UNIV +1
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proportional resonant controller must choose an appropriate discretization method, and different discretization methods will cause the frequency characteristics of the proportional resonant controller to shift

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
  • Grid-connection control policy for motor train unit grid-side converter under network voltage fluctuation working condition
  • Grid-connection control policy for motor train unit grid-side converter under network voltage fluctuation working condition
  • Grid-connection control policy for motor train unit grid-side converter under network voltage fluctuation working condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] The grid-connected control strategy of the grid-side converter of the EMU under the grid voltage fluctuation condition of the present invention, the method includes:

[0055] Based on the theoretical basis of the three-phase VSR rotating coordinate system, the mathematical model of the single-phase VSR rotating coordinate system is established;

[0056] Using the fast virtual axis algorithm to improve the delay problem of the current control internal model;

[0057] Realize independent adjustment of active power and reactive power;

[0058] Solve the mutual coupling problem of dq components of VSR through the current inner loop decoupling control design;

[0059] Use the carrier phase shift technology to suppress the harmonic component in the grid side current.

[0060] On the basis of the above technical solutions, such as figure 1 As shown, the s...

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 relates to a grid-connection control policy for a motor train unit grid-side converter under a network voltage fluctuation working condition. A single-phase VSR rotary coordinate system mathematical model is established based on three-phase VSR rotary coordinate system theoretical basis; the problem of delay of a current control internal model is relieved by adopting a rapid virtual axis algorithm; independent regulation on the active power and the reactive power is carried out separately; the mutual coupling problem of the VSR and d and q components is solved by the design of the current inner loop decoupling control; and the harmonic component in the grid-side current is restrained by adopting a carrier phase-shifting technology. According to the grid-connection control policy provided by the invention, the rotary coordinate system based control method and the rapid virtual axis algorithm are adopted, so that static-error-free tracking for the grid current as well as the independent control on the active power and the reactive power can be realized; the problem of delay of the current loop control existing in the pure virtual axis control method is also solved; the dynamic performance of the system is greatly improved; and the harmonic component in the grid-side current is restrained by adopting the carrier phase-shifting technology.

Description

technical field [0001] The invention relates to the technical fields of power electronics, electric transmission and new energy, and specifically relates to a grid-connected control strategy for a grid-side converter of an EMU under fluctuating grid voltage conditions. Background technique [0002] The PWM (Pulse Width Modulation) rectifier is an important part of the entire traction drive system as a converter on the grid side of the EMU. Its structural form and control method have a decisive impact on increasing the power of the grid, reducing the harmonic content of the grid current, stabilizing the intermediate DC circuit voltage, and ensuring the normal operation of the voltage-type inverter on the motor side. To realize the good working characteristics of the PWM rectifier, the key lies in the control of the input current of the rectifier. In order to make the PWM rectifier achieve unity power factor and reduce the harmonic content in the input current, the input curr...

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 Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/16
CPCH02J3/01H02J3/16H02J3/38Y02E40/30Y02E40/40
Inventor 刁利军陈大分阮白水张馨予刘志刚王磊陈杰
Owner BEIJING 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