Three-phase electric and electronic transformer based on multi-level multi-module cascade structure

A technology of electronic transformers and cascaded structures, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve the problems of high cost, achieve the effects of facilitating production, solving power grid voltage sags, improving power quality and operating reliability

Inactive Publication Date: 2012-12-19
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, due to the relatively high cost of existing power electronic devices, the overall cost of power electronic transformers is much higher than that of traditional power transformers.

Method used

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  • Three-phase electric and electronic transformer based on multi-level multi-module cascade structure
  • Three-phase electric and electronic transformer based on multi-level multi-module cascade structure
  • Three-phase electric and electronic transformer based on multi-level multi-module cascade structure

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Embodiment Construction

[0049] The three-phase power electronic transformer based on the multi-level and multi-module cascade structure provided by the present invention adopts the technical scheme that the high-voltage side is connected in series and the low-voltage side is connected in parallel, and the three-phase structures are the same and independent. The overall structure of all four topologies is divided into three stages: input stage, isolation stage and output stage. The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings, which are to explain rather than limit the present invention.

[0050] The three-phase power electronic transformer series topology of the invention based on the multi-level and multi-module cascade structure adopts the technical scheme of the high-voltage side in series and the low-voltage side in parallel, the three-phase structure is the same and independent, and the first topology is as follows: ...

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Abstract

The invention discloses a three-phase electric and electronic transformer based on a multi-level multi-module cascade structure. The three-phase electric and electronic transformer has three levels, i.e. an input level, an isolation level and an output level. An output end of an input-level power converter is connected with an input end of a high-frequency DC/AC (direct current/alternating current) link power converter; an output end of the high-frequency DC/AC link power converter is connected with the primary side of a high-frequency transformer; the secondary side of the high-frequency transformer is connected with the input end of the high-frequency DC/AC link power converter; the output end of the high-frequency DC/AC link power converter is connected with an input end of an output-level power converter; an output end of the output-level power converter is connected with an input end of an LC wave filter; and the LC wave filter is connected with a three-phase power supply network. Basic functions, such as transformation, isolation and energy transfer of the traditional electric transformer can be realized, and for the input voltage with different levels, corresponding voltage can be born only by calculating the corresponding number of input-level serial modules and serial connection according to corresponding module number.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and relates to a three-phase power electronic transformer based on a multi-level and multi-module cascade structure. Background technique [0002] In the power system, traditional power transformers, which mainly play the role of transformation and isolation, are widely used. On the one hand, traditional power transformers have the advantages of high efficiency, low cost, high reliability, and simple structure; The environment poses a threat, the distorted current will pollute the power grid with nonlinear loads, and the load will be affected when the power grid fluctuates. With the development of the power system, especially the development of distributed generation systems and new energy sources, there is an urgent need for a new power conversion device that can realize load-side voltage regulation, power factor correction, It has functions such as harmonic suppression o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/315
Inventor 刘进军王新宇徐涛涛王晓剑
Owner XI AN JIAOTONG UNIV
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