A Multiport DC-DC Autotransformer and Its Application

A technology of autotransformer and AC transformer, which is applied in the direction of DC power input conversion to DC power output, DC power supply parallel operation, power transmission AC network, etc. It can solve the problem of not proposing the DC system and specifying how to design the rated voltage of the converter. and rated power

Active Publication Date: 2016-04-13
HUAZHONG UNIV OF SCI & TECH
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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

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  • A Multiport DC-DC Autotransformer and Its Application
  • A Multiport DC-DC Autotransformer and Its Application
  • A Multiport DC-DC Autotransformer and Its Application

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[0078] In order to make the object, technical solution and advantages of the present invention more clear, 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.

[0079] 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.

[0080] figure 1 Sh...

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Abstract

A multi-port DC-DC autotransformer, which is used for realizing interconnected transmission among a plurality of DC systems of different voltage levels. The autotransformer comprises 2N-1 current converters. The 2N-1 current converters are connected in series in sequence at a DC side and are connected to an AC line at an AC side, and the positive electrode of the ith current converter and the negative electrode of the (2N-i)th current converter of the 2N-1 current converters connected in series in sequence are respectively and correspondingly connected to the positive electrode and the negative electrode of the ith DC system, where N is the number of DC systems, and i is the serial number of the current converter. Further disclosed are a capacity design method for the current converters in the autotransformer and a control method for the autotransformer. The autotransformer enables most of the power transmitted among various DC systems to be directly transmitted through the electrical interconnection among the various DC systems without DC-AC-DC conversion, so that the rated voltage and the operating loss of the various current converters are greatly reduced, thereby reducing operating costs.

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 ...

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Application Information

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Patent Type & Authority Patents(China)
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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