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DC protection constant value switching method comprising DC circuit breaker

A DC circuit breaker and DC protection technology, which is applied to emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve problems such as no configuration, failure to isolate faulty lines or faulty converter stations, and prevent accidents from expanding Effect

Pending Publication Date: 2021-12-14
国网河北省电力有限公司雄安新区供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, in the NA multi-terminal flexible DC transmission project, since the DC side is not equipped with a DC circuit breaker that can break the fault current, although the DC protection device is equipped with multiple differential protection Isolate the faulty line or the faulty converter station. When the DC system fails, only three-terminal outage can be adopted, and the AC circuit breaker can be tripped to cut off the fault current channel.

Method used

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  • DC protection constant value switching method comprising DC circuit breaker
  • DC protection constant value switching method comprising DC circuit breaker
  • DC protection constant value switching method comprising DC circuit breaker

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Embodiment Construction

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0057] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, a...

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Abstract

The invention discloses a DC protection constant-value switching method containing a DC circuit breaker, which is used for formulating a DC circuit breaker fault isolation strategy and a constant-value switching strategy for a multi-terminal flexible DC system in order to realize QH line fault positioning and QA in-station fault isolation. According to the operation requirement of a DC system after the DC circuit breaker is additionally installed, a constant value switching strategy of DC protection is provided, and QH line and QA station faults are isolated through the DC circuit breaker. Fixed value time delay of a protection element in an original direct current protection system is optimized and adjusted, communication between direct current protection and a system-level controller is increased, action signals of a differential protection element of a QA station are transparently transmitted at three ends, and related protection time delay of a JN station and an SC station is changed in a short time. Under the condition that the safety of primary equipment is not influenced, fault equipment can be quickly isolated, and the flexible DC system is switched to the next stable operation mode.

Description

technical field [0001] The invention relates to a DC protection fixed value switching method including a DC circuit breaker, belonging to the technical field of circuit breaker control. Background technique [0002] After the Nanao (hereinafter referred to as NA) multi-terminal flexible DC system is installed with a mechanical high-voltage DC circuit breaker, in order to realize that the faulty station connected to the DC circuit breaker can be quickly and effectively isolated, and the non-faulty station can run stably in a specific operating mode, it is necessary to The DC protection strategy of the system is adjusted to adapt to the new operating mode of the system. [0003] Under the protection function configuration and setting setting conditions of the NA multi-terminal flexible DC system before the transformation, when any protection area in the DC system fails, the DC protection system can identify and block the converter valve, trip the AC circuit breaker, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 李振伟王晶赵天翊赵树军单保涛陶陈彬马隽
Owner 国网河北省电力有限公司雄安新区供电公司
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