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DAB-based power electronic transformer submodule topology and control method thereof

A technology of power electronics and control methods, which is applied in the direction of high-efficiency power electronics conversion, adjustment of electric variables, control/regulation systems, etc., can solve the problems of inability to realize soft switching, large losses, and low efficiency of the whole machine, so as to reduce the quantity and improve Efficiency, the effect of reducing the switching loss of the device

Active Publication Date: 2020-07-10
NR ENG CO LTD +4
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a DAB converter-based power electronic transformer sub-module topology and its control method, and solve the problem that the power electronic transformer topology high-voltage AC side sub-module switching device cannot realize soft switching , leading to large loss and low efficiency of the whole machine

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  • DAB-based power electronic transformer submodule topology and control method thereof
  • DAB-based power electronic transformer submodule topology and control method thereof
  • DAB-based power electronic transformer submodule topology and control method thereof

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Embodiment Construction

[0018] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, it is a full-bridge sub-module topology diagram of a DAB-based power electronic transformer sub-module topology proposed by the present invention. The present invention improves the traditional power electronic transformer sub-module topology based on cascaded H-bridge converters and DAB converters. The new sub-module topology is composed of a primary side bridge circuit, a high frequency transformer and a secondary side bridge circuit. The primary side bridge circuit is composed of three groups of bridge arms, the first energy storage capacitor and an inductance, and the three groups of bridge arms include the switch tube Q 1 / Q 2 The first bridge arm constituted by the switching tube Q 3 / Q 4 The second bridge arm constituted by the switching tube S 1 / S 2 The fifth bridge arm is formed; the middle point of the ...

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Abstract

The invention discloses a DAB-based power electronic transformer submodule topology and a control method thereof, which can form a power electronic transformer with a CHB structure to realize electricenergy conversion from medium-high voltage alternating current to medium-high voltage direct current and low-voltage direct current. According to the topology, on the basis of a DAB converter structure, zero-voltage switching-on of a multiplexing switch tube in a sub-module topology can be realized through multiplexing of a half-bridge structure in combination with a corresponding control strategy, the loss of a switch device can be reduced, the efficiency of the converter can be improved, and meanwhile, the topology has the advantages of few switch devices and compact structure.

Description

technical field [0001] The invention relates to a DAB (dual active bridge, dual active bridge power converter) converter-based power electronic transformer sub-module topology and a control method thereof, belonging to the technical field of power electronics. Background technique [0002] With the rapid development of renewable energy power generation and the increase of DC loads, traditional industrial frequency transformers are no longer sufficient to meet the requirements and challenges of modern power systems due to the lack of intelligent control links and DC conversion ports. Moreover, the power frequency transformer is bulky and heavy, requiring a large floor space. With the rapid development of semiconductor devices, a new type of intelligent transformer based on high-power power electronic conversion technology is proposed, which can not only reduce the weight and volume of the transformer, but also provide a variety of AC and DC ports, which is flexible and variab...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0054Y02B70/10
Inventor 魏星吴小丹杨晨陈武马大俊舒良才郁正纲伏祥运孙海霞朱立位岳付昌袁晓冬史明明
Owner NR ENG CO LTD