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DC transmission circuit, DC transmission system and control method of DC transmission circuit

A technology of DC power transmission and control method, which is applied to emergency protection circuit devices, electrical components, power transmission AC networks, etc., and can solve the problems of weak power grid protection capability of flexible DC power transmission systems.

Inactive Publication Date: 2019-05-31
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a direct current transmission circuit, a direct current transmission system and a control method for a direct current transmission circuit, aiming at solving the technical problem of weak protection ability of the flexible direct current transmission system power grid

Method used

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  • DC transmission circuit, DC transmission system and control method of DC transmission circuit
  • DC transmission circuit, DC transmission system and control method of DC transmission circuit
  • DC transmission circuit, DC transmission system and control method of DC transmission circuit

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Embodiment Construction

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0062] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0063] In addition, the ...

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Abstract

The invention discloses a DC transmission circuit, a DC transmission system and a control method of the DC transmission circuit. The DC transmission circuit is formed by a controller, a first full-bridge circuit, a second full-bridge circuit, a third full-bridge circuit, a fourth full-bridge circuit and a first half-bridge circuit. Specifically, two full-bridge portions connected in parallel are disposed in each of bridge arms, and then the parallel full-bridge portions are connected to a first preset converter and a second preset converter respectively. When a DC fault occurs in the first preset converter, the full-bridge portion connected to the first preset converter can be isolated in order to guarantee the normal operation of the full-bridge portion connected to the second preset converter and the half-bridge portion. Obviously, in the event of a DC fault, the fault range can be limited to isolate the DC fault and protect the loop without the fault from being affected. The DC transmission circuit solves the technical problem that a flexible DC transmission system has a weak grid protection capability.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a direct current transmission circuit, a direct current transmission system and a control method for the direct current transmission circuit. Background technique [0002] With the continuous development of flexible direct current transmission systems, flexible direct current transmission systems based on modular multilevel converters (MMC) are widely used in island power grid connections, asynchronous interconnection between power grids, and distributed energy access. Scenes. [0003] However, due to the relatively small damping of this type of flexible DC transmission system, the transmission speed of the fault current is also fast, which naturally increases the requirements for the protection strategy of the flexible DC power grid. However, most flexible HVDC systems cannot meet this requirement. [0004] It can be seen that the flexible DC trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02H7/26
CPCY02E60/60
Inventor 黄萌刘浴霜朱自立陈永洋查晓明
Owner WUHAN UNIV
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