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

An Improved AC/AC Converter System Using Phase-shifting Transformer

A phase-shifting transformer and AC frequency conversion technology, applied in the field of power grid, can solve problems such as high cost, and achieve the effects of stable and reliable performance, simple circuit and reasonable design

Active Publication Date: 2016-04-27
XIAN JIENENG ELECTRIC POWER TECH
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Passive governance is currently the most widely used, but its cost is often high

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
  • An Improved AC/AC Converter System Using Phase-shifting Transformer
  • An Improved AC/AC Converter System Using Phase-shifting Transformer
  • An Improved AC/AC Converter System Using Phase-shifting Transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0029] A three-phase 12-pulse alternating frequency conversion circuit using a phase-shifting transformer such as figure 1 and Figure 4 As shown, the input current harmonic suppression is realized based on the following principles:

[0030] An AC inverter system improved by using a phase-shifting transformer, comprising: a power grid, a three-phase AC inverter connected to the grid, the power grid and a phase of the output of the three-phase AC inverter are connected by an ordinary three-winding transformer, The other two-phase power grid is connected with the three-phase AC-AC converter using a phase-shifting transformer.

[0031] Preferably, an ordinary three-winding transformer is used to connect the power grid to the output phase A of the...

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 an improved alternative current-alternative current frequency converter system through utilization of a phase-shifting transformer. The system comprises a power grid and a three-phase alternative current-alternative current frequency converter connected with the power grid. The power grid is connected with one output phase of the three-phase alternative current-alternative current frequency converter through a common three-winding transformer, and the power grid is connected with another two phases of the three-phase alternative current-alternative current frequency converter through the phase-shifting transformer. The alternative current-alternative current frequency converter system can further reduce total harmonic distortion (THD) of input current, improves quality of electric energy between the power grid and a production field of an industrial enterprise, and has the advantages of being simple in implementation method, and low in cost.

Description

technical field [0001] The invention relates to the field of power grids, in particular to the application of a phase-shifting transformer in a 12-pulse AC / AC converter. Background technique [0002] The AC frequency converter is a direct AC-AC frequency conversion device, which can directly convert a frequency of AC power into a variable frequency AC power, and has been widely used in frequency conversion and speed regulation transmission systems of medium-voltage and high-power AC motors. The three-phase AC / AC inverter commonly used at present is a 6-pulse circuit. Its output upper limit frequency is only 1 / 3 of the grid frequency and its harmonic content is very high. It not only injects a large number of harmonics into the grid, but also seriously affects the power quality of the public grid. It may also cause adjacent appliances not to work properly. If a three-phase AC / AC inverter with 12-pulse circuit is used, not only can the output upper limit frequency be increase...

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): H02M5/10H02M1/12
Inventor 胡永生
Owner XIAN JIENENG ELECTRIC POWER TECH
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