Voltage-source-converter-based direct-current fault current-limiting module and protection plan

A technology of voltage source converter and current limiting module, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of difficult isolation of DC faults, meet the requirements of reducing operating speed and cutting capacity, and reduce additional power loss , low cost effect

Active Publication Date: 2017-08-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the difficult problem of DC fault isolation in the current flexible DC system, the present invention proposes a DC fault current limiting module and protection scheme based on voltage source converters

Method used

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  • Voltage-source-converter-based direct-current fault current-limiting module and protection plan
  • Voltage-source-converter-based direct-current fault current-limiting module and protection plan

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Embodiment Construction

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but the implementation scope of the present invention is not limited thereto. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] figure 1 It is a schematic diagram of a DC fault current limiting module based on a voltage source converter. The current limiting module is installed at the positive and negative poles at the outlet of the DC side of the voltage source converter; the current limiting module includes a fully controlled transistor T and a current limiting resistor R lim , the connection method is: fully controlled transistor T and current limiting resistor R lim The formed parallel modules are connected in series to the outlet of the DC side of the volt...

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Abstract

The invention relates to a voltage-source-converter-based direct-current fault current-limiting module and a protection plan. The current-limiting module installed at positive and negative electrodes of a direct-current side outlet of a voltage source converter consists of a full-control transistor T and a current-limiting resistor Rlim. When a direct-current system works normally, the full-control transistor T is in a conduction state all the time and the current-limiting resistor is in a bypass state. After a fault occurs at the system, the full-control transistor T in the current-limiting module is turned off according to an action signal sent by out converter protection and thus the fault current in the current-limiting module only flows through the current-limiting resistor; and on the basis of comparison of data collected at the direct-current side with various setting conditions, whether a fault occurs at the system and whether the fault occurs at an alternating-current side or the direct-current side are determined. Compared with the prior art, the voltage-source-converter-based direct-current fault current-limiting module and a protection plan are simple and reliable; and over-current influences of the alternating-current side, the direct-current side, and the converter can be limited in an allowed range, so that the breaking capacity requirement of a direct-current circuit breaker can be reduced.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a DC fault current limiting module and a protection scheme based on a voltage source converter. Background technique [0002] DC fault isolation technology is a key technology in the development of flexible DC systems. When a DC fault occurs in the flexible DC system, the fault current rises rapidly to a large overcurrent level, which will seriously affect the safe and reliable operation of the entire DC system, including the AC side, DC side and converter. In order to ensure the safe and reliable operation of the DC system, it is required to quickly isolate the faulty DC line within a few milliseconds of the fault, that is, a certain fault isolation method must be adopted to isolate the DC faulty line. [0003] At present, there are mainly three methods for isolating DC faults in DC systems: (1) When a DC fault occurs, the DC fault line is isolated by tripping t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 许阔王婉君赵娜朱永强贾利虎夏瑞华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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