CN113092937A - Active power distribution network fault positioning method based on FTU current variation - Google Patents
Active power distribution network fault positioning method based on FTU current variation Download PDFInfo
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- CN113092937A CN113092937A CN202110372938.6A CN202110372938A CN113092937A CN 113092937 A CN113092937 A CN 113092937A CN 202110372938 A CN202110372938 A CN 202110372938A CN 113092937 A CN113092937 A CN 113092937A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The invention discloses an active power distribution network fault positioning method based on FTU current variation, which comprises the steps of detecting phase components and zero sequence components of voltage and current of an active power distribution network in real time through an FTU, taking the current mutation moment as a fault starting point, and taking the moment when the current recovers to a normal state as a fault ending point; after a fault occurs, selecting fault boundary equipment, and performing fault judgment on peripheral equipment on the fault boundary equipment to obtain a plurality of fault positioning base points; calculating a transmission path according to the fault positioning base point, and obtaining a predicted fault point according to a calculation result of the transmission path; calculating the reliability of the predicted fault point, performing fault location fault tolerance processing under the condition that the reliability is lower than a preset threshold value, judging whether switch state information uploaded by the power distribution switch monitoring terminal is complete or not, and if the switch state information is incomplete, performing information completion according to a node switch overcurrent judgment rule to obtain a fault location result; and sending the fault positioning result to a monitoring center.
Description
Technical Field
The invention relates to the field of power system line fault positioning, in particular to an active power distribution network fault positioning method based on FTU current variation.
Background
With the access of a large number of Distributed Generation (DG) power distribution networks, an active power distribution network is changed from an original radial network containing a single power supply into an active network with power and fault current flowing in two directions during normal operation, so that the traditional protection and control method lags behind. According to data statistics, in all power failures of a user, the power failure caused by the power distribution system exceeds 80%, so that the equipment failure location and the failure influence area are timely and accurately judged, the equipment failure location is quickly and accurately isolated, the power supply of a non-failure section in the failure influence area is quickly recovered, the power failure time and the power failure area are favorably reduced, the economic benefit is improved, and the power failure detection method has great significance for the stability of a power system.
When power failure caused by power distribution system faults occurs, the conventional device cannot timely and accurately judge the fault location and the fault influence area of equipment, cannot quickly and accurately isolate the equipment and the fault location, and cannot quickly recover power supply of a non-fault section in the area.
Therefore, there is a need for an improved structure that overcomes the above-mentioned deficiencies.
Disclosure of Invention
The invention aims to provide an active distribution network fault positioning method based on FTU current variation, which is used for realizing the positioning of distribution network faults, improving the efficiency and accuracy of distribution network fault positioning and guaranteeing the safe operation of a system so as to solve the problems in the prior art.
The technical purpose of the invention is realized by the following technical scheme:
an active power distribution network fault positioning method based on FTU current variation comprises the following steps:
1) detecting phase components and zero sequence components of voltage and current of the active power distribution network in real time through the FTU, taking the current mutation moment as a fault starting point, and taking the moment when the current recovers to a normal state as a fault ending point;
2) after a fault occurs, selecting fault boundary equipment, and performing fault judgment on peripheral equipment on the fault boundary equipment to obtain a plurality of fault positioning base points;
3) calculating a transmission path according to the fault positioning base point, and obtaining a predicted fault point according to a calculation result of the transmission path;
4) calculating the reliability of the predicted fault point, performing fault location fault tolerance processing under the condition that the reliability is lower than a preset threshold value, judging whether switch state information uploaded by the power distribution switch monitoring terminal is complete or not, and if the switch state information is incomplete, performing information completion according to a node switch overcurrent judgment rule to obtain a fault location result;
5) and sending the fault positioning result to a monitoring center.
Further, if the reliability of the fault point is lower than a preset threshold, fault location and fault tolerance processing is performed.
Further, after the fault positioning result is sent to the monitoring center, the monitoring center further analyzes and processes the fault positioning result to obtain the fault type of the fault positioning position.
In conclusion, the invention has the following beneficial effects:
the method comprises the steps of detecting a phase component and a zero sequence component in an active power distribution network by setting a power distribution switch monitoring terminal, judging whether a device has a fault or not by the phase component and the zero sequence component, judging the fault of peripheral equipment by fault boundary equipment, judging a fault point by calculating a transmission path, finally locking a fault positioning result by judging the reliability of the fault point, sending the fault positioning result to a monitoring center, and finally realizing the detection and feedback of the fault.
Drawings
Fig. 1 is a schematic diagram of an active power distribution network fault location method based on FTU current variation according to the present invention.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.
The invention provides an active power distribution network fault positioning method based on FTU current variation, which comprises the following steps:
1) detecting phase components and zero sequence components of voltage and current of the active power distribution network in real time through the FTU, taking the current mutation moment as a fault starting point, and taking the moment when the current recovers to a normal state as a fault ending point;
2) after a fault occurs, selecting fault boundary equipment, and performing fault judgment on peripheral equipment on the fault boundary equipment to obtain a plurality of fault positioning base points;
3) calculating a transmission path according to the fault positioning base point, and obtaining a predicted fault point according to a calculation result of the transmission path;
4) calculating the reliability of the predicted fault point, performing fault location fault tolerance processing under the condition that the reliability is lower than a preset threshold value, judging whether switch state information uploaded by the power distribution switch monitoring terminal is complete or not, and if the switch state information is incomplete, performing information completion according to a node switch overcurrent judgment rule to obtain a fault location result;
5) and sending the fault positioning result to a monitoring center.
6) And after the fault positioning result is sent to the monitoring center, the monitoring center further analyzes and processes the fault positioning result to obtain the fault type of the fault positioning part.
Examples
Step S101, a power distribution switch monitoring terminal detects a phase component and a zero sequence component of an active power distribution network in real time and judges whether a fault occurs according to the phase component and the zero sequence component;
step S102: simulating an IEEE33 node power distribution network model containing a distributed power supply, and detecting phase components and zero sequence components of voltage and current of an active power distribution network in real time
Step S103, if a fault occurs, selecting fault boundary equipment, and performing fault judgment on peripheral equipment on the fault boundary equipment to obtain a plurality of fault positioning base points;
step S104, calculating a transmission path according to the fault positioning base point, and obtaining a predicted fault point according to the calculation result of the transmission path;
step S105, calculating the reliability of the predicted fault point, and performing fault positioning fault tolerance processing under the condition that the reliability is lower than a preset threshold value to obtain a fault positioning result;
and step S106, sending the fault positioning result to a monitoring center.
And S107, the monitoring center further analyzes and processes to obtain the fault type of the fault location.
In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. An active power distribution network fault positioning method based on FTU current variation is characterized by comprising the following steps:
1) detecting phase components and zero sequence components of voltage and current of the active power distribution network in real time through the FTU, taking the current mutation moment as a fault starting point, and taking the moment when the current recovers to a normal state as a fault ending point;
2) after a fault occurs, selecting fault boundary equipment, and performing fault judgment on peripheral equipment on the fault boundary equipment to obtain a plurality of fault positioning base points;
3) calculating a transmission path according to the fault positioning base point, and obtaining a predicted fault point according to a calculation result of the transmission path;
4) calculating the reliability of the predicted fault point, performing fault location fault tolerance processing under the condition that the reliability is lower than a preset threshold value, judging whether switch state information uploaded by the power distribution switch monitoring terminal is complete or not, and if the switch state information is incomplete, performing information completion according to a node switch overcurrent judgment rule to obtain a fault location result;
5) and sending the fault positioning result to a monitoring center.
2. The active power distribution network fault location method based on FTU current variation according to claim 1, wherein fault location fault tolerance processing is performed if the reliability of the fault point is lower than a preset threshold.
3. The active power distribution network fault location method based on FTU current variation according to claim 1, wherein after the fault location result is sent to a monitoring center, the monitoring center further analyzes and processes the fault location result to obtain a fault type at the fault location.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646130A (en) * | 2016-12-15 | 2017-05-10 | 山东工商学院 | Active power distribution network fault positioning method and system based on current polarity comparison |
| CN106646139A (en) * | 2016-12-30 | 2017-05-10 | 华北电力大学 | Method for positioning faults of power distribution network based on amplitude analysis of three-phase current |
| CN109507526A (en) * | 2018-10-29 | 2019-03-22 | 山东大学 | Fault Diagnosis Method for Distribution Networks based on synchronous phasor measurement and covariance matrix theory |
| CN109709443A (en) * | 2018-12-05 | 2019-05-03 | 华北电力大学 | The method and system of active distribution network fault location |
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- 2021-04-07 CN CN202110372938.6A patent/CN113092937A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646130A (en) * | 2016-12-15 | 2017-05-10 | 山东工商学院 | Active power distribution network fault positioning method and system based on current polarity comparison |
| CN106646139A (en) * | 2016-12-30 | 2017-05-10 | 华北电力大学 | Method for positioning faults of power distribution network based on amplitude analysis of three-phase current |
| CN109507526A (en) * | 2018-10-29 | 2019-03-22 | 山东大学 | Fault Diagnosis Method for Distribution Networks based on synchronous phasor measurement and covariance matrix theory |
| CN109709443A (en) * | 2018-12-05 | 2019-05-03 | 华北电力大学 | The method and system of active distribution network fault location |
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