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Determination method of power distribution network fault section and fault time

A distribution network fault and fault time technology, applied in the direction of fault location, information technology support system, etc., to achieve the effect of simple calculation, reliable results and large amount of calculation

Inactive Publication Date: 2019-06-14
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for judging the fault section and fault time of the distribution network, which can not only solve the problem of incomplete load characteristics, network topology, line concentration parameters, and line distribution parameters. Determination of the fault section under known conditions and the identification of the time when the fault occurs, and can meet the judgment results that meet the needs of practical applications

Method used

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  • Determination method of power distribution network fault section and fault time
  • Determination method of power distribution network fault section and fault time
  • Determination method of power distribution network fault section and fault time

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Embodiment 1

[0058] figure 1 It is a flow chart of a method for determining a distribution network fault section and fault time according to an exemplary embodiment. Such as figure 1 As shown, the embodiment of the present invention provides

[0059] A method for judging a distribution network fault section and fault time, the method comprising:

[0060] Build a dataset;

[0061] Calculate the evaluation index;

[0062] Set monitoring thresholds for fluctuations in evaluation indicators;

[0063] Determine the failure time and failure area based on the calculated evaluation index;

[0064] Determine the faulty phase.

[0065] In a possible implementation, the process of constructing the dataset includes:

[0066] Build a historical data set: use the data of the latest fault recovery of the measurement equipment at each measurement point to construct a historical data set, and calculate the maximum singular value σ of the covariance matrix of the historical data set through singular ...

Embodiment 2

[0089] figure 2 It is a flow chart of a method for determining a distribution network fault section and fault time according to another exemplary embodiment. Such as figure 2 As shown, the embodiment of the present invention provides

[0090] A method for judging a distribution network fault section and fault time, comprising:

[0091] Use historical measurement data and real-time online data to form historical data sets and online data sets respectively;

[0092] Solve the maximum singular value of the covariance matrix of the historical data set and the covariance matrix of the online data set respectively;

[0093] According to the ratio of the largest singular value, the distribution network fault section and fault time are judged.

[0094] In a possible implementation, the process of determining the distribution network fault section and fault time according to the ratio of the largest singular value includes:

[0095] First, real-time detection is performed on eac...

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Abstract

The invention discloses a determination method of power distribution network fault section and fault time. The determination method of the power distribution network fault section and the fault time comprises the steps that a data set is established; evaluation indexes are calculated; a monitoring threshold value for evaluating index fluctuation is arranged; the fault time and the fault area are determined based on the calculated evaluation indexes; and a fault phase is determined. Determination is conducted according to a history data set and a maximum singular value ratio of a covariance matrix of an online data set, real-time inspecting is conducted on all measuring points of the network, after the fault time is determined, the measured point data variation degree is determined according to the judgment results of all measured points of the fault time, the fault area is determined according to the fault generating time and variation degree rank, and the distance between the fault point and the measured point is determined through the variation degree, and the fault phase is judged through any measured point data in the fault area end. According to the determination method of thepower distribution network fault section and fault time, the determination method is suitable for all load levels, distribution regulation of distribution type electric supply and loads does not needto be obtained, the calculation amount is small, and principle and technical guarantee can be provided for a power distribution system with access to distribution type power or fault diagnoses for existing power distribution systems.

Description

technical field [0001] The invention relates to the technical field of distribution network protection including distributed power sources, in particular to a method for judging a distribution network fault section and fault time. Background technique [0002] The access of distributed power sources makes the distribution network change from a passive network to an active network, which changes the power flow direction of the distribution network and makes the fault characteristics change and make the existing relay protection of the existing distribution network prone to errors. It will have a non-negligible impact on the fault location, isolation and recovery of the distribution network. Accurate identification of the fault section is one of the important measures to effectively narrow the scope of fault location and ensure the reliable and stable operation of the system. Accurate determination of the time of fault occurrence provides guarantee for subsequent fault locatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08Y04S10/52
Inventor 刘洋王蕾张新慧陈羽张雪谭培红
Owner SHANDONG UNIV OF TECH
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