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A New Topology of Power Electronic Transformer

A technology of power electronics and topological structure, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve the problems of high cost, complex control system, large system volume, etc., to reduce volume, reduce investment cost, and reduce system modules number effect

Inactive Publication Date: 2019-08-09
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since power electronic transformers are often used in medium and high voltage distribution networks, this requires the high voltage side of power electronic transformers to be able to withstand medium and high voltage AC. Level converters, cascaded H-bridge converters, etc., are limited by the withstand voltage of power electronic switching devices, so that the number of cascaded modules in the existing front-end AC / DC structure is large, resulting in a complex control system and a large system volume. high cost

Method used

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  • A New Topology of Power Electronic Transformer
  • A New Topology of Power Electronic Transformer
  • A New Topology of Power Electronic Transformer

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Embodiment Construction

[0021] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] Such as Figure 1-9 As shown, the embodiment of the present invention provides a novel power electronic transformer topology, including an L filter 1, a high-voltage side H-VSC converter 2, a DC transformer DCT 3 based on an H-bridge converter and high-frequency isolation, and a three-phase square Wave converter S-VSC 4 and combined DC transformer A-DCT 5, one end of L filter 1 is connected to the high voltage AC bus, and the other end of L filter 1 is connected to the AC side end of H-VSC converter 2 on the high voltage side , the other end of the AC side of the high-voltage side H-VSC converter 2 is connected to the AC side of the thre...

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Abstract

The invention discloses a novel topological structure of a power electronic transformer, which relates to high-power flexible VSC transformation and DC transformation technology. The system structure mainly connects one end of the L or LC filter to the high-voltage AC bus, the other end of the L or LC filter is connected to the AC side of the H-VSC converter on the high-voltage side, and the other end of the AC side of the H-VSC converter on the high-voltage side One end is connected to the AC side of the three-phase square wave converter S-VSC, the DC side of the high-voltage side H-VSC converter is connected to the high-voltage DC side of the DC transformer DCT, and the DC side of the three-phase square wave converter S-VSC is connected to the combined DC The high-voltage DC side of the transformer A-DCT is connected, and the low-voltage side of the combined DC transformer A-DCT and the low-voltage side of the DC transformer DCT are connected in parallel to the low-voltage DC bus. The invention reduces the number of system modules, reduces the volume of the system, reduces the investment cost of the system at the same time, has strong practicability, and is easy to popularize and use.

Description

technical field [0001] The invention relates to high-power flexible VSC transformation and DC transformation technology, in particular to a new topology of power electronic transformer. Background technique [0002] The future distribution network will be the main carrier of the widely interconnected, highly intelligent, open and interactive "Energy Internet", which can realize the optimization of energy production, transmission, distribution, conversion, and consumption in a wide area. In addition, the future distribution network also needs to realize the exchange and distribution of energy in the region, and meet the needs of distributed power access and consumption. Traditional transformers can no longer meet the new needs of future distribution network development. Therefore, power electronic transformers with the potential to replace traditional transformers have emerged. Power electronic transformers, also known as power electronic transformers, are a combination of po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M7/219H02M3/335
CPCH02M3/33523H02M5/4585H02M7/219H02M1/007
Inventor 刘闯蔡国伟支月媚
Owner NORTHEAST DIANLI UNIVERSITY
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