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A Fault Location and Isolation Method for Flexible DC Distribution Network

A flexible DC power distribution and DC power distribution technology, which is applied in the direction of fault location, measurement of current/voltage, and detection of faults according to conductor types, etc., can solve problems such as inapplicability, achieve isolation, good economy, and easy realization of judgment conditions Effect

Active Publication Date: 2021-05-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not suitable for distribution networks with short lines, and also requires fault current limiters as protection boundaries

Method used

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  • A Fault Location and Isolation Method for Flexible DC Distribution Network
  • A Fault Location and Isolation Method for Flexible DC Distribution Network
  • A Fault Location and Isolation Method for Flexible DC Distribution Network

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Embodiment Construction

[0035] The present invention proposes a fault location and isolation method for a flexible DC power distribution network, which is a fault location and isolation method for a flexible DC power distribution network of a full-bridge sub-module FBMMC based on the current zero-crossing detection principle; mainly in the protection monitoring time interval The current measured by the protection at both ends of the fault line will not cross zero at the same time, and the current measured at both ends of the non-fault line will cross zero or not cross zero at the same time. Accurate positioning.

[0036] Below in conjunction with the accompanying drawings of the description, the specific implementation steps of the present invention are described in detail:

[0037] First of all, the present invention proposes a fault location and isolation method for flexible DC power distribution networks based on the principle of current zero-crossing detection on the premise that the fault curren...

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Abstract

The invention discloses a method for locating and isolating a fault of a flexible DC power distribution network, which belongs to the technical field of automatic relay protection of a power system. This method is based on the current zero-crossing detection principle of the fault location and isolation method of the full-bridge sub-modular (FBMMC) flexible DC power distribution network. The characteristics of zero can realize the fast and accurate positioning of the bipolar short-circuit fault of the flexible DC distribution network. Fast isolation of the faulty line is realized by marking the mechanical switch whose current at both ends of the line does not cross zero at the same time. This method distinguishes the fault area through communication at both ends of the line. It does not need to use the fault current limiter as the protection boundary. It has high reliability and can protect The full length of the line; the protection principle is simple, the judgment conditions are easy to realize, and the protection action is fast; the self-clearing fault current of the full bridge sub-module is used to realize the clearing and isolation of bipolar short-circuit faults.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation relay protection, and in particular relates to a method for fault location and isolation of a flexible direct current power distribution network. Background technique [0002] Today's power system has gradually developed from a small network to a large and super-large network, but it has brought a series of problems, such as the network topology and the operation of the power system have become more complex. In order to solve these problems, DC power distribution The network has become a research hotspot for electric power scientists; the flexible DC power distribution network can not only access distributed new energy sources, but also connect various independently operating micro-grids. Compared with the AC grid, the transmission capacity and stability have a qualitative leap. The development of flexible DC power distribution network has gone through line commutation con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/175H02H7/26
CPCG01R19/175G01R31/086H02H7/262Y04S10/52
Inventor 郑涛吴琼吕文轩曹虹王兴国
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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