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Flexible direct-current distribution network fault positioning and isolating method

A flexible DC power distribution and network fault technology, which is applied in the direction of fault location, current/voltage measurement, fault detection according to conductor type, etc., can solve the problems of inapplicability, achieve isolation, high reliability, and easy realization of judgment conditions Effect

Active Publication Date: 2020-01-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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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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  • Flexible direct-current distribution network fault positioning and isolating method
  • Flexible direct-current distribution network fault positioning and isolating method
  • Flexible direct-current distribution network fault positioning and isolating method

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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 flexible direct-current distribution network fault positioning and isolating method which belongs to the technical field of automatic relay protection of power systems. The method is a full-bridge submodule based modular multilevel converter (FBMMC) flexible direct-current distribution network fault positioning and isolating method based on a current zero-crossing detection principle. According to the method, the rapid and accurate positioning of a bipolar short-circuit fault of the flexible direct-current power distribution network is realized by utilizing the characteristic that protection measured currents at two ends of a fault line do not cross zero at the same time, cross zero at the same time or do not cross zero. The rapid isolation of the fault line is realized by a mechanical switch marked that currents at two ends of the line do not cross zero at the same time, a fault area is judged through communication at two ends of the line, a fault current limiter does not need to serve as a protection boundary, the reliability is high, the overall length of the line can be protected, the protection principle is simple, a judgment condition is easy to realize, the protection action is rapid, and the full-bridge sub-module is used for the self-clearing of fault current, and so the clearing and isolation of the bipolar short-circuit fault are realized.

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 Applications(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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