Method and system for ground fault identification of DC distribution network with mmc injected detection signal

A technology for DC distribution network and signal detection, applied in information technology support systems, measurement of electricity, fault locations, etc., can solve problems such as low sensitivity and reliability, and achieve the effects of fast speed, high sensitivity, and enhanced fault characteristics.

Active Publication Date: 2022-05-20
XI AN JIAOTONG UNIV +1
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Problems solved by technology

The existing method has low sensitivity and insufficient reliability, and the ground fault line selection method of the traditional AC small current grounding system is difficult to learn from in the flexible DC distribution network with a large number of distributed power sources and energy storage equipment. Therefore, it is urgent to study new Single-pole ground fault identification method for flexible DC distribution network

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  • Method and system for ground fault identification of DC distribution network with mmc injected detection signal
  • Method and system for ground fault identification of DC distribution network with mmc injected detection signal
  • Method and system for ground fault identification of DC distribution network with mmc injected detection signal

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Embodiment Construction

[0057] 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 some of the embodiments of the present invention, but 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 making creative efforts belong to the protection scope of the present invention.

[0058] In the description of the present invention, it should be understood that the terms "comprising" and "comprising" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, Presence or addition of wholes, steps, operations, elements, components and / or collections thereof.

[0059] It should also be understood that the terminology used in the descriptio...

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Abstract

The invention discloses a DC distribution network grounding fault identification method and system for detecting signals injected by MMC. With the help of an additional control strategy, the detection signal is injected into the feeder after the fault occurs, and according to the difference in the response of the faulty feeder and the healthy feeder to the detection signal Fault line identified. The active injection detection signal effectively enhances the fault characteristics, and the MMC-based injection method combined with the fault identification method avoids the installation of additional devices, and has the characteristics of high sensitivity and no need for double-terminal communication.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault identification, and in particular relates to a method and system for identifying a grounding fault of a DC distribution network by injecting a detection signal from an MMC. Background technique [0002] Due to the advantages of high power supply reliability and favorable acceptance of distributed power generation, DC power distribution technology has gradually become a research hotspot and has been demonstrated and applied in many places at home and abroad. The main topological structures of the DC distribution network include radial, two-end hand-in-hand and ring structures. Among them, the radial structure has the advantages of low investment cost, so it has become the most commonly used structure in the current engineering practice. [0003] The medium-voltage DC distribution network mostly adopts a pseudo-bipolar structure, and the DC side is grounded through a clamping resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088Y04S10/52
Inventor 常仲学徐瑞东宋国兵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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