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Method for detecting and positioning section faults of power distribution network containing DGs (distributed generators)

A technology of fault detection and positioning method, applied in fault location, electrical digital data processing, special data processing applications, etc., can solve problems such as insufficient adaptability, and achieve the effect of accurate positioning

Active Publication Date: 2015-01-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a section fault detection and location method for a distribution network containing DG in view of the lack of self-adaptability in the fault detection and location of the existing distribution network containing distributed power

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  • Method for detecting and positioning section faults of power distribution network containing DGs (distributed generators)
  • Method for detecting and positioning section faults of power distribution network containing DGs (distributed generators)
  • Method for detecting and positioning section faults of power distribution network containing DGs (distributed generators)

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Embodiment Construction

[0059] figure 1 It is the equivalent analysis diagram of the power system. Such as figure 1 As shown, the AC power source 101 is located upstream of the power system, and the entire equivalent power system is arbitrarily divided by n+1 nodes, which contains n equivalent sections 102, and the nodes at both ends of the equivalent section 102 are respectively i , j, wherein, n>0 and n is an integer. The current phase angle at each node is θ(x), where x=1,2,…,n+1, if n→+∞, θ(x) can be considered as the current phase angle function of the power system, and in this The radial direction of the power system is continuous. Therefore, the phase angle difference Δθ(i,j) of the current in the equivalent section 102 of the power system between any two different nodes i, j can be defined as the difference between the current phase angles at nodes i, j difference, its expression is: Δθ(i,j)=θ(i)-θ(j), where: i, j are two different nodes, i>0, j>i, and i, j Both are integers, θ(x) is the...

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Abstract

The invention relates to a method for detecting and positioning section faults of a power distribution network containing DGs (distributed generators). The method is characterized in that three-phase current information acquired by protection device installation points at two end nodes of a section is utilized, Clark transformation is adopted, three-phase current is transformed into Clark alpha-mode current and Clark beta-mode current, the Clark alpha-mode current and the Clark beta-mode current are subjected to Fourier transformation to acquire a phase angle of the Clark alpha-mode current and a phase angle of the Clark beta-mode current, data of the phase angles is uploaded to a relay protection control center, the relay protection control center can detect a fault and find out the section in which a fault point is located when the fault occurs in an electric power system through calculating the phase angle difference of the Clark alpha-mode current and the Clark beta-mode current of each section and through comparing a relation between an absolute value of the phase angle difference of the Clark alpha-mode current and the Clark beta-mode current of each section and a threshold value, and remove the fault section timely so as to complete a protection action. The method provided by the invention can be applied to detecting and positioning the section faults of the power distribution network containing the DGs under high permeability.

Description

technical field [0001] The invention relates to a fault detection and location method of a distribution network containing DG. Background technique [0002] The fault detection and location of the distribution network is an important part of the relay protection of the distribution network power system, which is of great significance to the safe operation of the distribution network and an important guarantee for the self-healing of the distribution network. After the fault, the fault area is removed in time, so that the entire system is affected by the fault to a minimum. With the development of distributed power generation technology, more and more distributed generators (Distributed Generators, DG) are connected to the distribution network, resulting in changes in the network structure of the distribution network and changes in the magnitude and direction of fault currents. The relay protection of the distribution network has brought many problems, such as the detection ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G06F19/00
CPCY04S10/52
Inventor 牛耕周龙齐智平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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