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

Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof

A high-voltage direct current, traction power supply technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, irreversible AC power input conversion to DC power output, etc., can solve resistance consumption, catenary network voltage drop Large size, short distance between power supply stations, etc., to achieve the effect of reducing DC output voltage ripple and AC current harmonics, increasing DC output voltage, and reducing catenary loss

Inactive Publication Date: 2012-03-28
TSINGHUA UNIV +1
View PDF3 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This power supply method has been used for decades. Its biggest advantage is that the device structure is simple and the technology is relatively mature. However, this traditional power supply scheme also has the following problems: 1. Due to the use of diode rectifiers, the energy can only be unidirectional flow, so the energy generated by vehicle braking cannot be fed back to the grid, and is usually consumed by resistors, resulting in a great waste of energy
2. The DC output voltage is uncontrollable and has a large fluctuation range, which is not conducive to the safe, reliable and economical operation of the vehicle
3. The catenary network has a large voltage drop, and the distance between power supply stations is short, usually no more than 3 to 4 kilometers, resulting in a large number of required power supply stations and a large construction investment
Applying the PWM rectifier to the urban rail transit traction power supply system can not only realize the feedback of train braking energy, save electric energy, and keep the DC voltage stable; at the same time, if the DC power supply can be increased to more than 1.5kV, the power supply distance can also be extended. Reducing the number of power supply stations and catenary loss has great practical application value, but compared with traditional diode rectifiers, PWM rectifiers are at a disadvantage in terms of price, reliability, maintenance, and overload capacity
In fact, for urban rail transit traction power supply systems, the required traction capacity is usually more than twice the braking capacity, so from the perspective of economy, the power supply scheme based on full PWM rectifier is not cost-effective

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
  • Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof
  • Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof
  • Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] Example: such as image 3 As shown, the rated capacity of the diode rectifier unit 20 is 6MW, in which: the phase-shifting transformer 21 is an epoxy resin cast dry-type transformer with a capacity of 6MVA, one primary winding, three secondary windings, and a transformation ratio of 35kV / 2.4 kV / 2.4kV / 2.4kV, the primary winding adopts △ connection, and the secondary winding adopts extended triangle connection, so that the output voltage phases of each secondary winding are +20°, 0°, -20° respectively, so that the entire diode rectifier unit 20 form 18 pulse rectification. The capacity of each diode rectifier unit 22 is 2MW, and the rated DC output voltage is 3kV, wherein the diodes are all disc-shaped 6kV high-voltage diodes. The AC side of each diode rectifier unit 22 is respectively connected to a secondary winding of the phase-shifting transformer 21 , and the DC side is connected in series sequentially.

[0038] Such as Figure 4 As shown, the capacity of the PWM ...

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 hybrid parallel type high-voltage direct current traction power supply current transformer and a control method thereof. The hybrid parallel type high-voltage direct current traction power supply current transformer is characterized by comprising a set of pulse width modulation (PWM) rectifier units and a set of diode rectifier units, wherein both an input end of the PWM rectifier units and an input end of the diode rectifier units are connected with an alternating current electric network, and an output end of the PWM rectifier units and an output end of the diode rectifier units are connected in parallel to realize high-voltage direct current output. Because the PWM rectifier units and the diode rectifier units are connected in series, the direct current output voltage of the entire current transformer is improved, the power supply distance is prolonged, and the contact net loss is reduced. Meanwhile, equipment investment is reduced, and the reliability of a system is improved. The hybrid parallel type high-voltage direct current traction power supply current transformer and the control method thereof can be widely applied to urban railway transit traction power supply systems.

Description

technical field [0001] The invention relates to a high-voltage direct current traction power supply conversion device and a control method thereof, in particular to a hybrid parallel high-voltage direct current traction power supply conversion device and a control method for supplying power to urban rail transit vehicles. Background technique [0002] At present, the traction power supply conversion device of urban rail transit in my country still uses diode rectifiers, and the power supply voltage is 750V or 1500V. This power supply method has been used for decades. Its biggest advantage is that the device structure is simple and the technology is relatively mature. However, this traditional power supply scheme also has the following problems: 1. Due to the use of diode rectifiers, the energy can only be unidirectional Therefore, the energy generated by vehicle braking cannot be fed back to the grid, and is usually consumed by resistors, resulting in a great waste of energy...

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): H02M7/04H02M7/217
Inventor 张钢柴建云牟富强
Owner TSINGHUA 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