Method for detecting and positioning section faults of a power distribution network containing distributed generators

A technology of distributed power supply and positioning method, which is applied in the direction of fault location, etc., and can solve problems such as insufficient adaptability

Active Publication Date: 2015-01-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of lack of self-adaptability in the fault detection and positioning of the existing distribu

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  • Method for detecting and positioning section faults of a power distribution network containing distributed generators
  • Method for detecting and positioning section faults of a power distribution network containing distributed generators
  • Method for detecting and positioning section faults of a power distribution network containing distributed generators

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Embodiment Construction

[0044] 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. 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 current phase angle at node x, x=...

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Abstract

The invention relates to a method for detecting and positioning section faults of a power distribution network containing distributed generators, which comprises a fault judging and positioning part and a fault type recognition part. A fault judging and positioning method comprises the steps of detecting a fault and recognizing a fault phase through comparing the relation between an absolute value of the phase angle difference of each phase current of each power system section and a threshold value, finding out a section where a fault point is located, and timely removing the fault section so as to complete a protection action. A fault type recognizing method comprises the steps of comparing zero-sequence current amplitude values at two end nodes of the fault section at the fault determination moment with a set threshold value on the basis of recognizing the fault phase, and judging whether the zero-sequence current amplitudes at the two end nodes of the fault section at the fault determination moment are less than or equal to the threshold value or not, thereby determining whether the fault is a phase-to-phase fault or a grounding fault. The method provided by the invention can be applied to detecting and positioning the section faults of the power distribution network containing the distributed generators under high permeability.

Description

technical field [0001] The invention relates to a method for detecting and locating faults in a distribution network containing distributed power sources. 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 prob...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 牛耕周龙齐智平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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