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Improved alternative current-alternative current frequency converter system through utilization of phase-shifting transformer

A technology of phase-shifting transformers and alternating frequency conversion, which is applied in the field of power grids, can solve problems such as high cost, and achieve stable and reliable performance, reasonable design, and simple circuits.

Active Publication Date: 2013-06-05
XIAN JIENENG ELECTRIC POWER TECH
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  • Description
  • Claims
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Problems solved by technology

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

Method used

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  • Improved alternative current-alternative current frequency converter system through utilization of phase-shifting transformer
  • Improved alternative current-alternative current frequency converter system through utilization of phase-shifting transformer
  • Improved alternative current-alternative current frequency converter system through utilization of phase-shifting transformer

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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...

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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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/10H02M1/12
Inventor 胡永生
Owner XIAN JIENENG ELECTRIC POWER TECH
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