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Multiport DC-DC autotransformer and application thereof

An autotransformer and AC transformer technology, applied in the direction of converting DC power input to DC power output, parallel operation of DC power supplies, power transmission AC network, etc. Ask questions about DC systems, etc.

Active Publication Date: 2014-06-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the scheme in 201410024869X can only connect two DC systems with different voltage levels. It does not propose a corresponding scheme to connect 3 or more DC systems with different voltage levels, nor does it specify how to design a DC system with more than 3 DC systems. The rated voltage and rated power of each converter in the three-dimensional DC-DC converter of the converter

Method used

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  • Multiport DC-DC autotransformer and application thereof
  • Multiport DC-DC autotransformer and application thereof
  • Multiport DC-DC autotransformer and application thereof

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Embodiment Construction

[0082] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0083] The multi-port DC-DC autotransformer provided by the embodiment of the present invention is used for interconnecting more than or equal to three DC systems with different rated DC voltages, and can solve the existing traditional multi-port DC using full-power DC-AC-DC conversion - The disadvantages of high converter cost and large loss caused by the DC converter.

[0084] figure 1 Shown...

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Abstract

The invention discloses a multiport DC-DC autotransformer which is used for achieving interconnection transmission between multiple direct current systems at different voltage levels. The autotransformer comprises 2N-1 transverters, the direct current sides of the 2N-1 transverters are sequentially connected in series, the alternating current sides of the 2N-1 transverters are connected to an alternating current circuit, and the positive electrode of the ith transverter and the negative electrode of the (2N-i)th transverter of the 2N-1 transverters sequentially connected in series are correspondingly connected with the positive electrode and the negative electrode of the ith direct current system respectively, wherein N is the number of the direct current systems, and i is the serial number of one transverter. The invention further discloses a capacity design method of the transverters in the autotransformer and a control method of the autotransformer. Through the multiport DC-DC autotransformer, most of power transmitted between all the direct current systems does not need to be converted in a DC-AC-DC mode and is directly transmitted through electrical interconnection between all the direct current systems, and thus the nominal voltage and the operating loss of all the transverters are greatly reduced, and the operating cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of flexible power transmission and distribution of power systems, and in particular relates to a DC-DC converter, which is suitable for interconnecting multiple DC systems with different voltage levels. Background technique [0002] With more and more wind power, solar power and other new energy generation connected to the grid and the development of DC transmission technology, multiple DC transmission lines are interconnected to form a multi-terminal DC transmission system and a DC system to solve large-scale new energy generation. The entry problem has become a technical solution that is widely concerned by the industry. In order to form a DC system, the interconnection of DC systems in various regions is an urgent problem to be solved. Due to the different functions of DC systems in various regions, the technologies used are different, and the ages of construction are different, the rated DC voltages of ...

Claims

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Application Information

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IPC IPC(8): H02J1/10
CPCH02M3/33584H02J1/10H02J3/36Y02E60/60
Inventor 林卫星文劲宇程时杰
Owner HUAZHONG UNIV OF SCI & TECH
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