CN111007315B - Circuit branch identification method based on current harmonic spectrum - Google Patents
Circuit branch identification method based on current harmonic spectrum Download PDFInfo
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Abstract
The invention provides a line branch identification method based on a current harmonic map. The line branch identification method is used for identifying whether a line branch belongs to a certain outgoing line of a superior node. The line branch identification method based on the current harmonics measures the current harmonic maps of the reference points and the points to be detected of the branch lines and calculates the distance between the reference points and the points to be detected, and identifies whether the points to be detected and the reference points belong to the same line branch according to whether the distance exceeds a preset threshold value. The line branch recognition device based on the current harmonic map is composed of a pincerlike current transformer, an AD acquisition module, a main processing module, a communication module and a display module, and is used for measuring the current harmonic map of a reference point and a measured point for all branches respectively and performing branch recognition to complete topology recognition of the line branches in the area to which the current harmonic map belongs. The method is non-invasive measurement and cannot influence the operation of the system; meanwhile, the current harmonic map is adopted, so that the reliability and the accuracy are ensured.
Description
Technical Field
The invention belongs to the technical field of power transmission and distribution in an electric power system, and particularly relates to a line branch identification method based on a current harmonic spectrum.
Background
The line branch referred to in the present invention refers to a topological path between a line from a power supply or a transformer output side to each next-stage transformer or load, and particularly refers to each topological branch (zone-phase-branch-user relationship) between a low-voltage transformer and a user table. The branch identification referred by the invention is to confirm the one-to-one correspondence between the outgoing line of the branch node at the upper stage and the line to be tested (especially the incoming line of the branch node at the lower stage).
As the positions of the line branches are mainly the positions of the feeder line outlet position, the T connection position, the branch rod, the branch box and the like, the identification objects aimed by the invention are the positions of the inlet line, the outlet line and the inlet line of the user electric meter terminal.
Due to the transformation of a power grid and the access of new energy, the topology of a power line changes, and challenges are brought to power overhaul and operation. In the process of electric power maintenance and line patrol, the outgoing line belonging to a certain electric power line is often required to be confirmed. Especially underground cables, pipeline runs and line topologies are often difficult to ascertain. One application scenario of the present invention is to identify cable runs in power patrols.
In the construction of an information system of a power distribution network, information inconsistency is caused by transformation of a transformer area line of a low-voltage side power supply area of a 10kV/0.4kV distribution transformer, user change and the like, so that user file information is incomplete due to historical reasons for some users; or the topological relation of the user profile information record does not accord with the actual topological relation. These errors can affect the normal development of services based on the topology of the power distribution network. The traditional manual record modification consumes a large amount of labor and time, and cannot meet the requirements of accuracy and efficiency. Identifying the line branches of the power distribution network is another application scenario of the invention.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a line branch identification method based on a current harmonic map, which realizes the identification and verification of the line branch relation by using the principle that the current harmonic characteristic maps of the same branch line loop are similar, solves the problem of the topology identification of the power line and the cable branch, and provides technical support for the scenes of power line inspection, maintenance, station area topology branch verification and the like.
The technical scheme of the method is applied to a line branch identification device based on current harmonics, and is characterized by comprising the following steps: the split core type current transformer comprises a split core type current transformer, an AD acquisition module, a main processing module, a communication module and a display module; the pincer-shaped current transformer, the AD acquisition module and the main processing module are sequentially connected in series; the main processing module is respectively connected with the communication module and the display module in sequence;
the pincerlike current transformer is used for current signals of a reference point or current signals of a point to be measured; the AD acquisition module is used for carrying out analog-to-digital conversion on the current signal to obtain a digital current signal of a field measurement datum point or a digital current signal of a field measurement point to be measured; the main processing module is used for carrying out a line branch recognition algorithm based on a current harmonic map according to the digital current signal of the field measurement datum point or the digital current signal of the field measurement point to be measured, and displaying a branch result in the display module; the communication module is used for performing data exchange communication between the two sets of line branch identification devices based on current harmonics and between a field measurement reference point and a field measurement point to be measured; the display module is used for displaying the identification result.
The technical scheme of the method is a line branch identification method based on a current harmonic map, and the method specifically comprises the following steps:
step 1: selecting the head section of a certain branch at the outgoing line side as a datum point, taking the tail end of a line to be measured as a point to be measured, respectively deploying the line branch recognition devices based on current harmonics at the positions of the datum point and the point to be measured, respectively acquiring a digital current signal or a current signal sampling value sequence of the point to be measured, and further processing through the main processing module to respectively obtain current harmonic map vectors of the datum point and the point to be measured;
step 2: calculating the distance between the current harmonic vector of the reference point and the current harmonic vector map of the point to be measured, and if the distance is smaller than a distance threshold value, determining that the point to be measured and the reference point belong to the same branch, otherwise, determining that the point to be measured and the reference point do not belong to the same branch;
and step 3: and (3) sequentially taking all the branch outgoing lines as reference points, and identifying the tail ends of all the lines to be tested through the steps 1 and 2, so that the topology of all the branches can be confirmed.
Preferably, the step 1 of respectively acquiring the digital current signal or the current signal sampling value sequence of the point to be measured specifically includes:
the current signals of the measurement datum points acquired by the synchronous acquisition of the pincerlike current transformer are as follows: x is the number of1(t) the current signal of the point to be measured is x2(t)；
The AD acquisition module is used for respectively carrying out analog-to-digital conversion on the current signal of the measurement reference point and the current signal of the point to be measured, and the current signal sampling value sequence of the reference point is respectively obtained as follows: x is the number of1(n) current signal sampling of the point to be measuredThe value sequence is x2(n)；
The main processing module respectively processes the sequences x1(n) and x2(n) obtaining the frequency domain component X by FFT1(k) And X2(k)；
The current frequency domain component amplitude sequence of the reference point is obtained as follows: { x1n1,2, … N, and the phase angle sequence of the current frequency domain component of the reference point is obtained as follows: { theta ]1n|n＝1,2,…N}；
The current frequency domain component amplitude sequence of the point to be measured is obtained as follows: { x2nObtaining a current frequency domain component phase angle sequence of a point to be measured as follows: { theta ]2n1,2, … N, and two sets of current harmonic map vectors are formed, that is, the current harmonic map vector of the reference point is: IG (air insulated gate bipolar translator)1And the current harmonic map vector of the point to be measured is as follows: IG (air insulated gate bipolar translator)2
IG1＝{(x11,θ11),(x12,θ12),…,(x1N,θ1N)}
IG2＝{(x11,θ11),(x12,θ12),…,(x1N,θ2N)}
Preferably, the distance between the two sets of current harmonic maps calculated in step 2 is D (IG)1，IG2) The specific calculation method comprises the following steps:
the distance threshold in step 2 is.
The invention has the beneficial effects that:
and (4) accuracy. The line branch identification method based on current harmonics reflects the dynamic change characteristics of different branch load characteristics theoretically, is an essential characteristic for distinguishing different branches, and therefore has extremely high accuracy.
Non-invasive measurement. The device provided by the invention uses the pincerlike current transformer to measure the line, does not inject signals into the line, and does not influence the operation of the line and the existing load equipment.
Easy to use. The device used by the invention can be designed in a portable and small-sized way in specific implementation, and is simple to operate and convenient to carry.
Drawings
FIG. 1: the invention relates to a hardware implementation block diagram of a device.
FIG. 2: is a flow chart of the recognition involved in the present invention.
Detailed Description
In order to more clearly illustrate the present invention and/or the technical solutions in the prior art, the following will describe embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The theoretical basis of the invention is kirchhoff's current law. According to kirchhoff's current law, the current on the same loop is equal everywhere. The power frequency current is, however, an alternating current whose instantaneous value changes dynamically with time. Meanwhile, the load of each branch circuit, particularly the nonlinear load, is also dynamically changed, so that the current fundamental wave and harmonic wave on the line are dynamically changed along with time. The invention adopts the current harmonic characteristic map to identify the line branches, and assumes that the branch lengths, the load impedances and the running states of different lines have differences, thereby representing that the current harmonic characteristic maps of different branches have corresponding differences to identify. The larger the dynamic operation difference characteristic of different line branches is, the larger the distance of the current harmonic map of the different line branches is.
To express the Distance between the current harmonic maps, the invention uses Euclidean Distance (Euclidean Distance) using a two-dimensional vector for calculation. The amplitude values and phase angle sequences { x ] of current frequency domain components of the reference point and the point to be measured are ordered1n|n＝1,2,…N}、{θ1n|n＝1,2,…N}、{x2n|n＝1,2,…N}、{θ2n1,2, … N, then current harmonics map IG1，IG2Respectively is as follows:
IG1＝{(x11,θ11),(x12,θ12),…,(x1N,θ1N)}
IG2＝{(x11,θ11),(x12,θ12),…,(x1N,θ2N)}
the distance calculation formula of the current harmonic map of the reference point and the point to be measured is as follows:
in the embodiment of the present invention, the maximum current harmonic number N is taken as 61.
As shown in fig. 1, the technical solution of the apparatus according to the embodiment of the present invention is a line branch identification apparatus based on current harmonics, including: the split core type current transformer comprises a split core type current transformer, an AD acquisition module, a main processing module, a communication module and a display module; the pincer-shaped current transformer, the AD acquisition module and the main processing module are sequentially connected in series; the main processing module is respectively connected with the communication module and the display module in sequence;
the clamp-on current transformer is of a model ETCR030A-3V and is used for a current signal of a reference point or a current signal of a point to be measured;
the AD acquisition module is AD7607 in type, and is used for carrying out analog-to-digital conversion on the current signal to obtain a digital current signal of a site measurement datum point or a digital current signal of a site measurement point to be measured;
the main processing module adopts a chip STM32F767 and is used for carrying out a line branch recognition algorithm based on a current harmonic map according to a digital current signal of a field measurement datum point or a digital current signal of a field measurement point to be measured and displaying a branch result to a display module;
the communication module is a LoRa module based on a chip Sx1278 and is used for carrying out data exchange communication between the two sets of line branch identification devices based on the current harmonics and between a field measurement datum point and a field measurement point to be measured;
the display module adopts a serial port LCD touch screen and is used for displaying the identification result.
As shown in fig. 1, the technical solution of the method in the embodiment of the present invention is a line branch identification method based on a current harmonic map, which specifically includes the following steps:
step 1: selecting the head section of a certain branch at the outgoing line side as a datum point, taking the tail end of a line to be measured as a point to be measured, respectively deploying the line branch recognition devices based on current harmonics at the positions of the datum point and the point to be measured, respectively acquiring a digital current signal or a current signal sampling value sequence of the point to be measured, and further processing through the main processing module to respectively obtain current harmonic map vectors of the datum point and the point to be measured;
in the step 1, the step of respectively acquiring the digital current signal or the current signal sampling value sequence of the point to be measured specifically comprises the following steps:
the current signals of the measurement datum points acquired by the synchronous acquisition of the pincerlike current transformer are as follows: x is the number of1(t) the current signal of the point to be measured is x2(t)；
The AD acquisition module is used for respectively carrying out analog-to-digital conversion on the current signal of the measurement reference point and the current signal of the point to be measured, and the current signal sampling value sequence of the reference point is respectively obtained as follows: x is the number of1(n), the current signal sampling value sequence of the point to be measured is x2(n)；
The main processing module respectively processes the sequences x1(n) and x2(n) obtaining the frequency domain component X by FFT1(k) And X2(k)；
The current frequency domain component amplitude sequence of the reference point is obtained as follows: { x1n1,2, … N, and the phase angle sequence of the current frequency domain component of the reference point is obtained as follows: { theta ]1n|n＝1,2,…N}；
The current frequency domain component amplitude sequence of the point to be measured is obtained as follows: { x2nObtaining a current frequency domain component phase angle sequence of a point to be measured as follows: { theta ]2n1,2, … N, and two sets of current harmonic map vectors are formed, that is, the current harmonic map vector of the reference point is: IG (air insulated gate bipolar translator)1And the current harmonic map vector of the point to be measured is as follows: IG (air insulated gate bipolar translator)2
IG1＝{(x11,θ11),(x12,θ12),…,(x1N,θ1N)}
IG2＝{(x11,θ11),(x12,θ12),…,(x1N,θ2N)}
Where N-61 is the maximum current harmonic order.
Step 2: calculating the distance between the current harmonic vector of the reference point and the current harmonic vector map of the point to be measured, and if the distance is smaller than a threshold value, determining that the point to be measured and the reference point belong to the same branch, otherwise, determining that the point to be measured and the reference point do not belong to the same branch;
calculating the distance between the two current harmonic maps as D (IG) in step 21，IG2) The specific calculation method comprises the following steps:
the distance threshold in step 2 is.
And step 3: and (3) sequentially taking all the branch outgoing lines as reference points, and identifying the tail ends of all the lines to be tested through the steps 1 and 2, so that the topology of all the branches can be confirmed.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A line branch identification method based on a current harmonic map is characterized by comprising the following steps:
the line branch identification method based on the current harmonic map is applied to a line branch identification device based on the current harmonic map, and the line branch identification device based on the current harmonic map comprises the following steps: the split core type current transformer comprises a split core type current transformer, an AD acquisition module, a main processing module, a communication module and a display module; the pincer-shaped current transformer, the AD acquisition module and the main processing module are sequentially connected in series; the main processing module is respectively connected with the communication module and the display module in sequence;
the pincerlike current transformer is used for acquiring a current signal of a reference point or a current signal of a point to be measured; the AD acquisition module is used for carrying out analog-to-digital conversion on the current signal to obtain a digital current signal of a field measurement datum point or a digital current signal of a field measurement point to be measured; the main processing module is used for carrying out a line branch recognition algorithm based on a current harmonic map according to the digital current signal of the field measurement datum point or the digital current signal of the field measurement point to be measured, and displaying a branch result in the display module; the communication module is used for performing data exchange communication between the two sets of line branch identification devices based on the current harmonic map and between the site measurement datum point and the site measurement point to be measured; the display module is used for displaying the identification result;
step 1: selecting the head end of a certain branch at the outgoing line side as a datum point, taking the tail end of a line to be measured as a point to be measured, respectively deploying the line branch recognition devices based on the current harmonic map at the positions of the datum point and the point to be measured, respectively acquiring a digital current signal or a current signal sampling value sequence of the point to be measured, and further processing through the main processing module to respectively obtain current harmonic map vectors of the datum point and the point to be measured;
step 2: calculating the distance between the current harmonic map vector of the reference point and the current harmonic map vector of the point to be measured, and if the distance is smaller than a threshold value, determining that the point to be measured and the reference point belong to the same branch, otherwise, determining that the point to be measured and the reference point do not belong to the same branch;
and step 3: and (3) sequentially taking all the branch outgoing lines as reference points, and identifying the tail ends of all the lines to be tested through the steps 1 and 2, so that the topology of all the branches can be confirmed.
2. The line branch identification method based on the current harmonic map as claimed in claim 1, wherein:
in the step 1, the step of respectively acquiring the digital current signal or the current signal sampling value sequence of the point to be measured specifically comprises the following steps:
the current signals of the measurement datum points acquired by the synchronous acquisition of the pincerlike current transformer are as follows: x is the number of1(t) the current signal of the point to be measured is x2(t)；
The AD acquisition module is used for respectively carrying out analog-to-digital conversion on the current signal of the measurement reference point and the current signal of the point to be measured, and the current signal sampling value sequence of the reference point is respectively obtained as follows: x is the number of1(n), the current signal sampling value sequence of the point to be measured is x2(n)；
The main processing module respectively processes the sequences x1(n) and x2(n) obtaining the frequency domain component X by FFT1(k) And X2(k)；
The current frequency domain component amplitude sequence of the reference point is obtained as follows: { x1n1,2, … N, and the phase angle sequence of the current frequency domain component of the reference point is obtained as follows: { theta ]1n|n＝1,2,…N}；
The current frequency domain component amplitude sequence of the point to be measured is obtained as follows: { x2nObtaining a current frequency domain component phase angle sequence of a point to be measured as follows: { theta ]2n1,2, … N, and two sets of current harmonic map vectors are formed, that is, the current harmonic map vector of the reference point is: IG (air insulated gate bipolar translator)1And the current harmonic map vector of the point to be measured is as follows: IG (air insulated gate bipolar translator)2；
IG1＝{(x11,θ11),(x12,θ12),…,(x1N,θ1N)}
IG2＝{(x11,θ11),(x12,θ12),…,(x1N,θ2N)}
Calculating the distance D (IG) between the two current harmonic maps in the step 21，IG2) The specific calculation method comprises the following steps:
the distance threshold in step 2 is.
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| CN113064103B (en) * | 2021-04-15 | 2022-05-17 | 国网浙江省电力有限公司舟山供电公司 | Secondary cable identification method and device based on asymmetric phase signals |
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