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Synchronous measurement data-based distribution network regional positioning method

A technology for regional positioning and data measurement, which is applied in the direction of fault location, information technology support system, system integration technology, etc., can solve the problem of incomplete knowledge of load characteristics, line parameters, distributed power supply output, etc., and achieve strong practical industrial application value , the effect of small amount of calculation

Active Publication Date: 2019-06-18
SHANDONG UNIV OF TECH +1
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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 distribution network area positioning method based on synchronous measurement data, which can not only solve the problem of load characteristics, network topology, line parameters, and incomplete distributed power output. Known fault area location problem, and can meet the requirements of distribution network relay protection under distributed power access

Method used

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  • Synchronous measurement data-based distribution network regional positioning method
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  • Synchronous measurement data-based distribution network regional positioning method

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Embodiment 1

[0055] figure 1 It is a flow chart of a distribution network area positioning method based on synchronous measurement data according to an exemplary embodiment. Such as figure 1 As shown, a distribution network area positioning method based on synchronous measurement data provided by an embodiment of the present invention includes:

[0056] According to the real-time data of μPMU configured in the whole network, determine the fluctuation degree of the covariance ratio of the monitoring point data;

[0057] According to whether the degree of fluctuation exceeds the set threshold confidence interval to judge whether there is a fault;

[0058] Sort by the degree of variation to determine the fault area.

[0059] In a possible implementation, according to the real-time data of the μPMU configured in the whole network, the process of determining the fluctuation degree of the covariance ratio of the monitoring point data is as follows: use the previously measured data to form a h...

Embodiment 2

[0064] figure 2 It is a flow chart of a distribution network area positioning method based on synchronous measurement data according to another exemplary embodiment. Such as figure 2 As shown, a distribution network area positioning method based on synchronous measurement data provided by an embodiment of the present invention includes:

[0065] Calculate the comprehensive evaluation index of μPMU measurement data;

[0066] Determine the indicator threshold confidence interval;

[0067] Set the data exception judgment rules of μPMU monitoring points;

[0068] Locate the fault area.

[0069] In a possible implementation, the process of calculating the comprehensive evaluation index of μPMU measurement data is: under any load level, the evaluation index of single-type measurement data and the comprehensive evaluation index of multi-type measurement data are:

[0070]

[0071]

[0072]

[0073] Among them, θ and Ω represent the evaluation index of single-type meas...

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Abstract

The invention discloses a synchronous measurement data-based distribution network regional positioning method. According to the method, a fault region is determined according to the generalized eigenvalues of a historical dataset covariance matrix and an online dataset covariance matrix, and a set threshold confidence interval. The method specifically includes the following steps that: the fluctuation degree of the covariance ratio of monitoring point data is determined according to muPMU real-time data configured by a whole network; whether a fault occurs is judged according to judgment on whether the fluctuation degree exceeds the set threshold confidence interval; and a fault area is determined according to an abnormal change degree sequence. With the method of the invention adopted, the problem of the location of a fault area where load characteristics, network topology, line parameters, and distributed power source output are not completely known can be solved, and requirements for distribution network relay protection under a distributed source power connection condition can be satisfied.

Description

technical field [0001] The present invention relates to the technical field of localization of active distribution network fault areas, in particular to a distribution network area positioning method based on synchronous measurement data. 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. [0003] Accurate identification of the fault section is one of the important measures to effectively reduce the scope of fault location and ensure the reliable and stable operation of the system. With a large number of micro phasor measurement units (μPMU: Micro PhasorMeasurement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/22Y02E40/70Y02E60/00
Inventor 刘洋赵艳雷王蕾凌平陈东刘劲松
Owner SHANDONG UNIV OF TECH
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