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A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range

An electronic transformer and automatic balancing technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problem of high cost, achieve easy production, solve the grid voltage sag, and improve the power quality and operational reliability

Active Publication Date: 2014-04-23
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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  • A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range
  • A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range
  • A three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range

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Embodiment 1

[0038] A three-phase power electronic transformer based on a multi-level multi-module cascade structure that can balance asymmetric loads, using such as figure 1 The topology structure includes an input stage, an isolation stage, and an output stage, and the power converter of each stage includes two input terminals and two output terminals;

[0039] Each specific power converter is a single-phase fully-controlled bridge composed of four fully-controlled devices, and its structure is as follows figure 2 Shown is the fully controlled single-phase full-bridge converter represented by Sub. A reactor is connected in series on the AC side of each phase cascaded power converter to achieve harmonic suppression on the AC side. A capacitor bank of a certain capacity is connected in parallel between the two terminal wires of the DC side of the single-phase full-control bridge power converter.

[0040] Among the three phases of the input stage, each phase includes N identical input stage pow...

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Abstract

The invention discloses a three-phase power electronic transformer capable of automatically balancing asymmetric loads in a total range. The three-phase power electronic transformer comprises three stages including an input stage, an isolation stage, and an output stage. The output end of each power converter in the input stage is connected with the input end of a corresponding high-frequency DC / AC link power converter. The output end of each high-frequency DC / AC link power converter is connected with the primary side of a corresponding high-frequency transformer. The secondary side of each high-frequency transformer is connected with the input end of a corresponding high-frequency AC / DC link power converter. The output end of each high-frequency AC / DC link power converter is connected with the input end of a corresponding power converter in the output stage. The output end of each power converter in the output stage is connected with the input end of an LC filter. The LC filter is connected with a three-phase power supply grid. The three-phase power electronic transformer may achieve fundamental functions of voltage transformation, isolation, and energy transmission or the like of a conventional power transformer. In the case of input voltage in different grades, just the number of corresponding cascaded modules is required to be calculated. And corresponding voltage can be borne by connecting the modules in a cascaded manner according to the corresponding number of the modules.

Description

Technical field [0001] The invention belongs to the technical field of power electronic transformers, and relates to a three-phase power electronic transformer that automatically balances asymmetric loads in a full range. Background technique [0002] In power systems, traditional power transformers, which are mainly used for voltage 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; on the other hand, they also have obvious shortcomings, such as bulky, large volume, large no-load loss, single function, and the use of transformer oil The environment poses a threat. Distorted currents will pollute the power grid with nonlinear loads, and will affect the load when the power grid fluctuates. With the development of power systems, especially the development of distributed power generation systems and new energy sources, there is an urgent need for a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 刘进军王新宇欧阳少迪孟飞
Owner XI AN JIAOTONG UNIV
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