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Topological structure of high-power density power electronic transformer and control method for topological structure

A high power density, power electronics technology, applied in the field of power transformation, can solve the problems of high cost, low power density, large volume, etc.

Active Publication Date: 2018-01-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The topological structure of these power electronic transformers has many conversion stages, and the number of power devices and transformers used is relatively large, the volume is relatively large, the power density is relatively small, and the cost is relatively high, so it is difficult to achieve large-scale use.

Method used

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  • Topological structure of high-power density power electronic transformer and control method for topological structure
  • Topological structure of high-power density power electronic transformer and control method for topological structure
  • Topological structure of high-power density power electronic transformer and control method for topological structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] like figure 1 The high power density power electronic transformer topology shown is composed of a high-voltage AC stage, a high-frequency isolation transformer, and a low-voltage DC stage. The high-voltage AC stage adopts a new topology, and the high-voltage AC power supply passes through the filter inductor L f After that, it is connected to the input terminal a of N cascaded full-bridge sub-modules, and the input terminal a is connected to the middle point of the left bridge arm of the first full-bridge sub-module. like figure 2 As shown, the middle point of the right bridge arm of the first full-bridge sub-module is connected to the middle point of the left bridge arm of the second full-bridge sub-module, and so on, the middle of the right bridge arm of the N-1th full-bridge sub-module point is connected to the middle point of the left bridge arm of the Nth full-bridge sub-module, and the middle point of the right bridge arm of the N-th full-bridge sub-module is co...

Embodiment 2

[0072] This example is extended and changed on the basis of the first example. The entire topology is still composed of a high-voltage AC stage, a high-frequency isolation transformer, and a low-voltage DC stage, such as image 3 shown. High-voltage AC power passes through the filter inductor L f Connect to the input terminal a of N cascaded full-bridge submodules afterwards, the structure of N cascaded full-bridge submodules is consistent with that described in Embodiment 1, and the output of N cascaded full-bridge submodules is the same as the high The same-named end of the primary side of the frequency isolation transformer is connected, and the different-named end of the original side of the high-frequency isolation transformer is connected back to the high-voltage AC power supply. L r C r One end of the series resonant circuit is connected to the input end a of the N cascaded full-bridge sub-modules, and the other end is connected to the different-named end b of the p...

Embodiment 3

[0075] like Figure 4 (a), Figure 4 As shown in (b), the entire topology is still composed of a high-voltage AC stage, a high-frequency isolation transformer, and a low-voltage DC stage, and the number of cascaded full bridges on the high-voltage side, LC series circuits, high-frequency isolation transformers, and H-bridges on the low-voltage side The number is multiples of the topology described in Embodiment 1 or Embodiment 2. When two bridge arms of each phase of the high-voltage AC stage circuit are connected in series with the topological structures described in Embodiment 1, each phase of the bridge arm of the high-voltage AC stage circuit is composed of 2N cascaded full-bridge sub-modules. High-voltage AC power passes through the filter inductor L f Then connect to the input terminal a1 of 2N cascaded full-bridge sub-modules, the structure of the 2N cascaded full-bridge sub-modules is consistent with that described in Embodiment 1, and the output terminal b2 of the 2...

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Abstract

The invention discloses a topological structure of a high-power density power electronic transformer and a control method for the topological structure. A group of series resonance circuits (or band-pass filters formed by other components) are added to a bridge arm branch with N cascaded H bridge submodules at a high voltage AC side, and meanwhile, a high-frequency signal is superposed into a modulating wave signal to transmit energy of the high voltage AC side to a low voltage side in a high frequency manner. According to the topological structure, one series resonance circuit is directly formed through cascaded H bridges, an LrCr series resonance circuit and a high-frequency isolation transformer at the high voltage side to output a high-frequency waveform and to achieve energy transmission. A large number of DC-DC conversion modules are saved, meanwhile, power switching devices applied to the high voltage AC side are also greatly reduced, the volume and the cost of a system are greatly reduced, the work efficiency of the system is improved and the power density of the power electronic transformer is improved.

Description

technical field [0001] The invention belongs to the technical field of power transformation, and relates to a transformer topology, and more specifically relates to a new power electronic transformer topology with high power and high density and a control method thereof. Background technique [0002] With the rapid development of smart grids, traditional power transformers are no longer sufficient to meet the challenges of modern power systems. Traditional industrial frequency transformers are not only bulky, but also lack intelligent control links and DC conversion ports. The power electronic transformer is a new type of intelligent transformer based on high-power power electronic conversion technology. It can not only replace the traditional transformer, but also has flexible controllability, and a variety of AC and DC ports for convenient and flexible access. Various distributed energy sources, energy storage and loads provide the possibility to efficiently solve many pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/72
Inventor 陈武马大俊蒋晓剑
Owner SOUTHEAST UNIV
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