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Direct-current power distribution network single-pole grounding fault section positioning method and system

A ground fault, segment location technology, applied in fault location, current/voltage measurement, information technology support system, etc., can solve the problem of increasing system operating costs, reducing power electronic converter adjustment speed, and failing to identify developing faults, etc. problems, to achieve the effect of enhancing fault characteristics and obvious differences in response characteristics

Pending Publication Date: 2022-08-02
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this scheme reduces the regulation speed of the power electronic converter, increases the operating cost of the system, and cannot identify developing faults

Method used

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  • Direct-current power distribution network single-pole grounding fault section positioning method and system
  • Direct-current power distribution network single-pole grounding fault section positioning method and system
  • Direct-current power distribution network single-pole grounding fault section positioning method and system

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Embodiment Construction

[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] In the description of the present invention, it is to be understood that the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, The existence or addition of a whole, step, operation, element, component, and / or a collection thereof.

[0062] It should also be understood that the terminology used in t...

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Abstract

The invention discloses a method and a system for positioning a single-pole grounding fault section of a direct-current power distribution network, and the method comprises the steps: cooperatively inputting a resonant branch to inject a current detection signal through an MMC additional control strategy, then setting an action sequence of a load switch / circuit breaker based on a delay level difference principle, and completing the positioning and isolation of a fault section based on single-end information. The section positioning method avoids the installation of additional devices, and has the characteristics of high sensitivity and no need of double-end communication.

Description

technical field [0001] The invention belongs to the technical field of fault section location of a distribution network, and in particular relates to a method and system for locating a single-pole grounding fault section of a direct current distribution network. Background technique [0002] The DC distribution network has become a research hotspot in the field of distribution network due to its advantages of easy grid connection of renewable energy, better power quality, longer power supply radius, and smaller transmission loss. Years of theoretical research and engineering practice show that the double-ended DC distribution network based on full-bridge MMC is an ideal topology. [0003] In order to ensure the reliability of power supply, most of my country's ±10kV DC distribution network pilot projects adopt symmetrical single-pole structure and AC side neutral point low-current grounding method. In this case, due to the weak single-pole grounding fault characteristics, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R31/08G01R19/00
CPCG01R31/52G01R31/08G01R31/088G01R19/00Y04S10/52
Inventor 常仲学徐瑞东宋国兵杨佳怡侯俊杰常娜娜常鹏关宏杨心刚刘琦杜洋周德生孙沛
Owner XI AN JIAOTONG UNIV
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