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Flexible DC network DC short-circuit fault ride through method

A flexible DC and DC short-circuit technology, applied in the direction of power transmission and AC network, can solve the problems of increasing DC line loss, unable to effectively realize DC fault protection of multi-terminal flexible HVDC transmission system, etc.

Active Publication Date: 2015-11-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method inevitably increases the loss of the DC line (the loss caused by the smoothing reactor)
[0007] To sum up, none of the above three schemes can effectively realize the DC fault protection of the multi-terminal flexible HVDC transmission system.

Method used

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  • Flexible DC network DC short-circuit fault ride through method
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Embodiment Construction

[0045] 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.

[0046] MMC with negative level output capability includes not only MMC composed of a sub-module with negative level output capability (such as full-bridge MMC), but also MMC composed of submodules with negative level output capability and other types of submodules. (Such as half-bridge and full-bridge hybrid MMC). The mechanical DC circuit breaker technology is relatively mature, but the circui...

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Abstract

The invention discloses a flexible DC network DC short-circuit fault ride through method realized by cooperative control of an MMC with negative level output capability and a mechanical DC circuit breaker, and belongs to the field of flexible DC network DC fault protection. There are three means for processing a DC fault in the prior art mainly, including cut-off of connection with a DC system by means of AC equipment, DC fault elimination by means of a current converter and DC fault isolation by means of DC equipment, while the three methods cannot effectively realize flexible DC network DC fault protection. The MMC comprises submodules with negative level output capability, and voltage of the DC port of the current converter is enabled to be negative-level by flexibly regulating output voltage of upper and lower bridge arms so that objectives that DC short-circuit fault current is controllable and is rapidly reduced to zero can be achieved, and the requirement of isolating the DC fault can be met by the mechanical DC circuit breaker.

Description

technical field [0001] The invention belongs to the field of DC fault protection of flexible DC networks, and more specifically relates to a method based on coordinated control of a modular multilevel converter MMC (ModularMultilevelConverter) with negative level output capability and a mechanical DC circuit breaker to realize the DC short-circuit fault of a flexible DC network method of crossing. Background technique [0002] In recent years, offshore wind power and new energy power generation in remote areas have developed rapidly. [0003] Compared with AC transmission and traditional DC transmission, flexible DC transmission technology can independently control active and reactive power, and has a strong resistance to voltage disturbances. The composed grid can realize the decoupling of voltage problems and the support of frequency problems between interconnected systems. An active and controllable power grid is the best choice to realize multi-location new energy inter...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 胡家兵何震林磊
Owner HUAZHONG UNIV OF SCI & TECH
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