Flexible switch device for connecting two DC power distribution systems

A technology of DC power distribution and switchgear, applied in the field of electric power, can solve problems such as low transmission efficiency, influence, and weaken system stability, and achieve the effects of improving reliability, optimizing configuration, and eliminating mutual influence.

Active Publication Date: 2017-02-22
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This connection method makes the energy scheduling between DC microgrids very complicated, and the transmission efficiency is low
If the DC microgrids are directly connected, when one of the DC microgrids fails, it will affect other DC microgrids and weaken the stability of the system.

Method used

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  • Flexible switch device for connecting two DC power distribution systems
  • Flexible switch device for connecting two DC power distribution systems
  • Flexible switch device for connecting two DC power distribution systems

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Embodiment Construction

[0042] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0043] Such as figure 1 As shown, the traditional DC microgrids are connected to a common AC bus through their respective bidirectional DC / AC converters. This connection method makes the energy scheduling between DC microgrids very complicated and the transmission efficiency is low. If the DC microgrids are directly connected, when one of the DC microgrids fails, it will affect other DC microgrids and weaken the stability of the system. Such as figure 2 As shown, the flexible switch device designed in the present invent...

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Abstract

The invention discloses a flexible switch device for connecting two DC power distribution systems. The device comprises a transformation unit, a detection unit and a control unit, wherein the transformation unit is used for connecting with two DC power distribution systems and performing transformation or isolation processing on the DC power distribution systems which are connected to two sides of the switch device, the detection unit is electrically connected with the transformation unit and is used for detecting bus voltages of the DC power distribution systems, and the control unit is connected with the transformation unit and the detection unit and is used for controlling the transformation unit to be in different working modes according to a detection result of the detection unit. By the flexible switch device, direct connection of different DC power distribution systems and bidirectional flow of energy are achieved, optimal configuration of energy among microgrids is ensured, the running of a plurality of DC microgrids is coordinated, the problem of effective fault isolation of a single microgrid is solved, and the system reliability is improved.

Description

technical field [0001] The invention relates to the field of electric power technology. More specifically, it relates to a flexible switching device for connecting two DC power distribution systems. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, loads and other devices according to certain operating rules. Since the traditional power system belongs to the AC system, considering the access problem of the micro-grid, the AC micro-grid has received more attention and developed rapidly. However, there are a large number of DC micro-power sources and DC loads in the micro-grid system. If only AC micro-grids are used to connect distributed power sources to supply power to the loads, a large number of multi-stage converters are needed to convert the form of electric energy, which not only reduces the power consumption The efficiency of transmission will also reduce t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02H7/22H02H7/26
CPCH02H7/22H02H7/268H02J1/10
Inventor 吴学智程盛童亦斌张维戈姜久春
Owner BEIJING JIAOTONG UNIV
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