CN112086965A - Low-voltage distribution network topology identification method and device - Google Patents
Low-voltage distribution network topology identification method and device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a method and a device for identifying topology of a low-voltage distribution network. The method comprises the following steps: I. generating random branch line codes for topology identification, forming the generated branch line codes into control commands, and then injecting the control commands into a pulse injection detection device at the station area side or the power receiving side; receiving the branch line code from the pulse injection detection device at the power receiving side or the station area side; III, matching according to branch line codes injected and received by a pulse injection detection device at the transformer area side or the power receiving side, and establishing a topological sequence of connection relations among the transformer area, the branch lines and the meter box; and IV, calculating the similarity and the correlation of the topological sequences, and determining the topological structure and the topological change of the low-voltage distribution network at a certain moment. The method and the device for identifying the topology of the low-voltage distribution network can accurately topology the topological relation of the low-voltage distribution network in real time and are adaptive to the access of a low-voltage sensing terminal.
Description
Technical Field
The invention belongs to the technical field of low-voltage distribution networks, and particularly relates to a low-voltage distribution network topology identification method and a low-voltage distribution network topology identification device.
Background
The low-voltage distribution network is the tail end of a power grid for providing electric energy for production and life of customers. With the rapid development of the social and economic level and the continuous improvement of the living standard of people, the requirement on the power supply reliability is higher and higher.
Therefore, the method has the advantages of effectively studying and judging the distribution network fault, improving the first-aid repair efficiency and restoring the power supply speed, and having important significance for guaranteeing the production economic benefit and the social stability. For a long time, when a power distribution network has a fault, before the fault is reported and then the power distribution network enters a site for emergency repair, fault information cannot be analyzed and fault sources and related equipment information can be accurately positioned, and only the description of a user and the confirmation of emergency repair personnel after the emergency repair personnel arrive at the site are relied on, so that the emergency repair progress and the scheduling of emergency repair resources are greatly influenced.
As a power failure emergency repair service directly facing a client, the speed of the emergency repair speed directly influences the reliability of power supply, and further influences the economic benefit and social stability. Therefore, how to improve the fault response speed and the fault research and judgment efficiency and shorten the fault processing time is a key problem to be solved urgently for improving the operation management level and the high-quality service level of the power distribution network.
The study on the topological structure of the low-voltage distribution network is crucial to the improvement of power supply reliability and power supply service capability of a power company. However, the existing method cannot accurately topology the topological relation of the low-voltage distribution network in the low-voltage distribution area in real time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a low-voltage distribution network topology identification method which can be used for accurately and timely topological relation of a low-voltage distribution network in a low-voltage distribution area.
In order to solve the technical problem, the invention provides a low-voltage distribution network topology identification method, which comprises the following steps:
generating a zone side branch line code for topology identification, wherein the zone side branch line code comprises a name of a zone to be injected, a zone code and a line code, and the generated zone side branch line code forms a zone side control instruction; injecting the station side control command into a pulse injection detection device at the station side, and receiving a station side branch line code from a pulse injection detection device at the power receiving side;
generating a branch line code of a power receiving side for topology identification, wherein the branch line code of the power receiving side comprises the name of a meter box, the meter box code and a line code, and the generated branch line code of the power receiving side forms a control instruction of the power receiving side; injecting the power receiving side control command into a pulse injection detection device on the power receiving side, and receiving a power receiving side branch line code from the pulse injection detection device on the station area side;
matching according to the station side and power receiving side branch line codes received by the pulse injection detection devices at the power receiving side and the station side, and establishing a station area, branch lines and meter box connection relation topological sequence;
and calculating the similarity and the correlation of the topological sequences, and determining the topological structure and the change of the low-voltage distribution network.
Preferably, the station area side control instruction includes a command byte, a segmentation character, and a station area side branch line code;
the power receiving side control instruction comprises a command byte, a segmentation character and a power receiving side branch line code.
The pulse injection detection device for injecting the station side control command to the station side, wherein the reception of the station side branch line code from the pulse injection detection device on the power receiving side includes:
forming distortion pulses in a pulse injection detection device at the station side by using a station side control command and injecting the distortion pulses into a low-voltage distribution network;
the distorted pulse is demodulated in a pulse injection detection device on the power receiving side to extract a branch line code on the station side.
Preferably, the step of forming the distortion pulse in the pulse injection detection device on the station side by the station side control command is:
A.1. after the pulse injection detection device at the station area side receives the injected station area side control instruction, establishing a branch relation between the line code and the branch line;
A.2. injecting carrier signals for different branch lines in a branch relationship from a plurality of carriers generated by a transmitter carrier;
A.3. the pulse injection device modulates the branch line code received in the step A.1 to the carrier signal selected in the step A.2 by adopting an FSK/BPSK modulation technology to obtain a modulated distortion pulse signal;
A.4. and injecting the obtained distorted pulse signal into a distribution station area distribution appearance circuit by a method for modulating a power frequency voltage signal.
Preferably, the step of demodulating the distorted pulse in the pulse injection detection device on the power receiving side to extract the station-side branch line code is:
B.1. the distorted pulse signals are transmitted to a user line through a power line carrier, and the distorted pulse signals are filtered by a filter in the pulse injection detection device at the power receiving side to obtain detection signals on the user line;
B.2. fourier transform is carried out on the detected signal, and a carrier list of the received distorted pulse signal is extracted;
B.3. and on the basis of the carrier list, constructing the molecular weight of each carrier and demodulating the molecular weight to obtain the branch line code of the station area side.
Preferably, the pulse injection detection device for injecting the power reception side control command to the power reception side receives the power reception side branch line code from the pulse injection detection device on the station side, and includes:
forming a distortion pulse in a pulse injection detection device at the power receiving side by a power receiving side control command and injecting the distortion pulse into a low-voltage distribution network line;
the distorted pulse is demodulated in a pulse injection detection device on the station side to extract a power receiving side branch line code.
Preferably, the step of forming the distorted pulse in the pulse injection detection device on the power receiving side by the power receiving side control command is:
C.1. after the pulse injection detection device at the power receiving side receives the injected power receiving side control instruction, establishing a branch relation between a line code and a meter box;
C.2. injecting carrier signals for different branch lines in a branch relationship from a plurality of carriers generated by a transmitter carrier;
C.3. the pulse injection device modulates the branch line code received in the step C.1 onto the carrier signal selected in the step C.2 by adopting an FSK/BPSK modulation technology to obtain a modulated distortion pulse signal;
C.4. and injecting the obtained distorted pulse signal into a low-voltage distribution appearance circuit by a method for modulating a power frequency current signal.
Preferably, the step of demodulating the distorted pulse in the pulse injection detection device on the station side to extract the power receiving side branch line code comprises:
D.1. the distorted pulse signal is transmitted to the transformer area through a power line carrier, and the distorted pulse signal is filtered by a band-pass filter in the pulse injection detection device at the transformer area side to obtain a detection signal on a user line;
D.2. fourier transform is carried out on the detected signal, and a carrier list of the received distorted pulse signal is extracted;
D.3. and on the basis of the carrier list, constructing the molecular weight of each carrier and demodulating the molecular weight to obtain the branch line code of the power receiving side.
Preferably, the detected carrier molecular weight is matched with the branch line code according to the platform area code, the meter box code, the line code and the injected distorted pulse signal obtained from the PMS, and a platform area, branch line and meter box connection relation topological sequence is established.
Preferably, the step of determining the topology and the change of the low-voltage distribution network specifically comprises:
E.1. eliminating the record of the inconsistency of the carrier molecular weight and the distorted pulse signal;
E.2. according to the list information obtained after the inconsistent frequency information is removed in the step E.1, constructing a branch line relation;
E.3. if a plurality of recorded branch line codes which are the same and have a common carrier frequency exist in the branch line relationship constructed in the step E.2, the user nodes belong to the same branch line, and the branch line relationship is adjusted according to the principle;
E.4. if the line codes of the two user nodes in the distribution area are the same, the two user nodes are in the same distribution area;
E.5. and if the two user nodes belong to the same station area, determining the node level according to the number of the carrier frequency unique values and the number of the branch line code unique values in the list, and finally determining the topological structure and the change of the low-voltage distribution network.
In addition, the invention also provides a low-voltage distribution network topology identification device, which comprises:
the pulse injection station area side module is configured to generate a station area side branch line code for topology identification, the station area side branch line code comprises a name of a station area to be injected, a station area code and a line code, and the generated station area side branch line code forms a station area side control instruction; injecting the station side control command into a pulse injection detection device at the station side, and receiving a station side branch line code from a pulse injection detection device at the power receiving side;
the pulse injection power receiving side module is configured to generate a power receiving side branch line code for topology identification, the power receiving side branch line code comprises a name of a meter box, a meter box code and a line code, and the generated power receiving side branch line code forms a power receiving side control instruction; injecting the power receiving side control command into a pulse injection detection device on the power receiving side, and receiving a power receiving side branch line code from the pulse injection detection device on the station area side;
the branch line matching module is configured to match the station side branch line codes and the power receiving side branch line codes received by the pulse injection detection devices on the station side and the power receiving side, and establish a topological sequence of connection relations among the station side branch lines and the meter boxes;
and the topological graph generation module is configured to be used for calculating the similarity and the correlation of the topological sequence and determining the topological structure and the change of the low-voltage distribution network at a certain moment.
Compared with the prior art, the invention has the following beneficial effects: the method and the device for identifying the low-voltage distribution network topology can accurately and timely analyze the low-voltage network topology relation of the low-voltage distribution area, adapt to the access of a low-voltage sensing terminal, simulate real-time situation fine judgment and fault trend prediction technology based on the accurate topology relation, and perform predictive diagnosis on the operation state and the fault trend of the low-voltage network by calculating and analyzing the monitoring data of the low-voltage distribution point in a deduction manner. The invention can carry out topology electrification on the 400V low-voltage network and monitor the real-time situation of the low-voltage network.
Drawings
Fig. 1 is a flow chart of a low-voltage distribution network topology identification method in an embodiment of the present invention;
FIG. 2 is a diagram illustrating a format of a control command according to an embodiment of the present invention;
FIG. 3 is a schematic view of a structure flow of a station side pulse injection detection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic structural flow chart of a pulse injection detection device on the power receiving side according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a branch relationship constructed in an embodiment of the present invention;
fig. 6 is a schematic diagram of an adjusted branch line topology according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Examples
The embodiment describes a low-voltage distribution network topology identification method.
The method is implemented based on topology identification APP, as shown in FIG. 1:
the invention discloses a low-voltage distribution network topology identification method, which specifically comprises the following processes:
step 1, generating a station area side branch line code for topology identification, forming a station area side control instruction by the generated station area side branch line code, and injecting the station area side control instruction into a pulse injection detection device at the station area side.
Taking a pulse injection detection device at the side of an injection platform as an example:
the topology identification APP obtains the name N of the region to be injected from a Power Management System (PMS)iZone code CAiLine code CLiGenerating a 32-byte station-side branch line code L using a hash functioni。
Coding the branch line L on the station sideiConstituting a control instruction I on the side of the station areaiAnd sends the control instruction I of the platform sideiThe pulse injection detection device is transmitted to the station side through a communication control module arranged on the station side. Control instruction IiThe format of (a) is shown in fig. 2. Wherein the command byte is 3 bytes, and the segmentation character is 1 wordSection '\ 0', the branch line code byte is 32 bytes.
And 2, forming a distortion pulse in the pulse injection detection device at the transformer area side by the transformer area side control instruction, and injecting the distortion pulse into a transformer area power distribution line.
As shown in fig. 1 and 3, the pulse injection detection device on the station area side includes a pulse injection device, a pulse detection device, a communication control module, a filter, a transmission carrier, a reception carrier, and the like.
The pulse injection device is used for modulating pulse signals and injecting the pulse signals into a low-voltage distribution network line of the transformer area through a low-voltage side of the transformer area;
the pulse detection device is used for sensing and detecting pulse signals transmitted in a low-voltage distribution network line in real time.
The communication control module is used for controlling the transmission of pulse signals in the power line broadband carrier, and the CCO main carrier chip and the STA secondary carrier chip are embedded to complete carrier communication according to the master-slave relationship.
The transmitter carrier is used for generating carrier signals and injecting the carrier signals for different branch lines.
The low-voltage power carrier is a communication system specific to a power system, and is a technology for transmitting an analog or digital signal at a high speed by a carrier system. The method has the greatest characteristic that data transmission can be carried out only by wires without erecting a network again.
The technology is that high frequency signals carrying information are loaded on current, then power line transmission of various grades is utilized, and a modem receiving the information separates the high frequency signals from the current and transmits the high frequency signals to a power line broadband user terminal.
The low voltage power line is never an ideal communication medium, but with the continuous progress of technology, especially the development of modulation technology and microelectronic technology, the practical application of the low voltage PLC is possible.
The specific process is as follows:
2.1) after the pulse injection detection device at the station area side receives the station area side control instruction which is injected by the topology identification APP and is composed of the branch line code at the station area side, the branch relation between the line code and the branch line is established.
The branch line code comprises the name of the station area to be injected, the station area code and the line code.
2.2) uploading the zone side branch line codes received in the step 1 and the established branch relation to a topology identification APP; the branch management module in the same station area adopts a filter, and carrier signals are injected into different branch lines in a branch relation from a plurality of carriers generated by a transmitter carrier machine.
2.3) the pulse injection device modulates the branch line code of the station area side received in the step 2.1 onto the carrier signal selected in the step 2.2 by adopting an FSK/BPSK modulation technology to obtain a modulated distortion pulse signal, wherein the modulated distortion signal is as follows:
wherein f iscRepresenting the frequency of the carrier signal, which is 100 KHz.
And 2.4) injecting the obtained distorted pulse signals into a distribution station area distribution appearance line by a method for modulating power frequency voltage signals.
2.5) area name, area code, line code and distorted pulse signal fiAnd uploading to a topology identification APP.
Step 3, demodulating the distorted pulse in a pulse injection detection device at the power receiving side (namely, a pulse injection detection device installed in a branch box of the low-voltage distribution line or a power receiving user at the tail end), and extracting a branch line code at the station area side borne by the demodulated distorted pulse;
and then uploading the demodulated coding list to a topology identification APP for subsequent processing.
As shown in fig. 1 and 4, the pulse injection detection device on the power receiving side also includes a pulse injection device, a pulse detection device, a communication control module, a filter, a transmitter carrier, a receiver carrier, and the like.
The pulse injection device is used for modulating pulse signals and injecting the pulse signals into a low-voltage distribution network circuit of the distribution area;
the pulse detection device is used for sensing and detecting pulse signals transmitted in a low-voltage distribution network line in real time.
The communication control module is used for controlling the transmission of pulse signals in the power line broadband carrier, and the CCO main carrier chip and the STA secondary carrier chip are embedded to complete carrier communication according to the master-slave relationship.
The transmitter carrier is used for generating carrier signals and injecting the carrier signals for different branch lines.
The method specifically comprises the following steps:
3.1) the distorted pulse signal is transmitted to the subscriber line through the power line carrier, and the band-pass filter in the pulse injection detection device at the power receiving side is used for detecting the distorted pulse signal fiAnd filtering to obtain a detection signal f (t) on the subscriber line.
And 3.2) the pulse detection device performs Fourier transform on the detected signal f (t) and extracts a carrier list F (w) of the received distorted pulse signal, wherein the expression of the carrier list F (w) is shown as the formula (1-2).
3.3) constructing the molecular weight f of each carrier based on the carrier listi' and demodulates it to obtain the branch line code Li′。
3.4) as shown in FIG. 1, the detected carrier molecular weight f is detected (by a pulse injection at the power receiving side into a communication control module in the detection device)i' and branch line coding Li' synchronization upload to topology recognition APP.
The station area code and the corresponding line code information are obtained through the steps 1 to 3.
In a similar way to the above steps 1 to 3, the topology identification APP may also inject a distorted pulse signal on the power receiving side and detect a branch line code on the power receiving side on the station area side, except that a current signal is injected on the power receiving side. The injection detection of the station side branch line code and the power receiving side branch line code are not in sequence.
Generating a branch line code of a power receiving side for topology identification, wherein the branch line code of the power receiving side comprises the name of a meter box, the meter box code and a line code, and the generated branch line code of the power receiving side forms a control instruction of the power receiving side; the power receiving side control command is injected to the pulse injection detection device on the power receiving side, and the power receiving side branch line code is received from the pulse injection detection device on the station area side.
Step 4, the step of forming a distortion pulse in the pulse injection detection device at the power receiving side by the control command at the power receiving side comprises the following steps:
4.1) after the pulse injection detection device at the power receiving side receives the injected power receiving side control instruction formed by the branch line code at the power receiving side, establishing the branch relation between the line code and the meter box;
the power receiving side branch line code comprises a name of a meter box, a meter box code and a line code;
4.2) uploading the branch line codes of the power receiving side received in the step 4.1 and the established branch relation to a topology identification APP; injecting carrier signals for different branch lines in a branch relationship from a plurality of carriers generated by a transmitter carrier;
4.3) the pulse injection device modulates the branch line code received in the step 4.1 to the carrier signal selected in the step 4.2 by adopting an FSK/BPSK modulation technology to obtain a modulated distortion pulse signal;
4.4) injecting the obtained distorted pulse signal into a low-voltage distribution appearance circuit by a method of modulating a power frequency current signal;
4.5) uploading the name of the meter box, the platform area code, the line code and the distorted pulse signal to a topology identification APP.
Step 5, demodulating the distorted pulse in the pulse injection detection device at the station area side to extract the branch line code at the power receiving side, comprising the steps of:
5.1. the distorted pulse signal is transmitted to the transformer area through a power line carrier, and the distorted pulse signal is filtered by a band-pass filter in the pulse injection detection device at the transformer area side to obtain a detection signal on a user line;
5.2. fourier transform is carried out on the detected signal, and a carrier list of the received distorted pulse signal is extracted;
5.3. on the basis of the carrier list, constructing the molecular weight of each carrier and demodulating the molecular weight of each carrier to obtain branch line codes of the power receiving side;
5.4. and synchronously uploading the detected carrier wave molecular weight and the branch line code to a topology identification APP.
In the embodiment, the electric box code and the corresponding line code information are obtained through the steps 4 to 5.
Step 6, the topology identification APP receives the station side branch line codes from the pulse injection detection devices on the power receiving side and the station side, which are already described in the above step 2 to step 4 and are not described here.
And 7, matching the topology identification APP according to the codes of the branch lines at the power receiving side and the power receiving side received by the pulse injection detection devices at the power receiving side and the power distribution area side, and establishing a topology sequence of connection relations of the power distribution area, the branch lines and the meter box.
Specifically, the detected carrier molecular weight and the branch line code are matched according to a platform area code, a meter box code, a line code and an injected distorted pulse signal obtained from the PMS, and a platform area, branch line and meter box connection relation topological sequence is established.
And 8, calculating the similarity and the correlation of the topological sequences, and determining the topological structure and the change of the low-voltage distribution network at a certain moment.
In view of interference of reflection and diffraction of signals on the line to demodulation, a user may receive a plurality of branch line codes, that is, when the list is constructed, a user may belong to a plurality of branch lists, and therefore, a final topology needs to be further determined.
8.1. Molecular weight f of rejected carrieri' sum distortion pulse signal fiInconsistent records.
8.2. According to the list information after the inconsistent frequency information is removed, a branch line relationship is constructed, as shown in fig. 5.
8.3. If in the branch line relationship constructed in step 8.2, there are multiple recorded branch line codes LiIdentical and having a common carrier frequency fnThen these usersThe nodes belong to the same branch line.
If fiAnd fkAre identical, and LiAnd LkSimilarly, adjusting the branch line relationship according to this principle is shown in fig. 6.
8.4. And if the line codes of the station areas of the two user nodes are the same, the two user nodes are in the same station area.
Otherwise, the two user nodes belong to different areas respectively.
8.5. And if the two user nodes belong to the same station area, determining the node level according to the number of the carrier frequency unique values and the number of the branch line code unique values in the list, and finally determining the topological structure and the change of the low-voltage distribution network at a certain moment.
It should be noted that, the above steps I, VI, VII, and VIII correspond to functions of four program modules of the topology identification APP, respectively, so that the present embodiment further provides a low voltage distribution network topology identification apparatus corresponding to the method of the present embodiment.
As shown in fig. 1, a topology identification device for a low-voltage distribution network includes:
the pulse injection station area side module is configured to generate a station area side branch line code for topology identification, the station area side branch line code comprises a name of a station area to be injected, a station area code and a line code, and the generated station area side branch line code forms a station area side control instruction; injecting the station side control command into a pulse injection detection device at the station side, and receiving a station side branch line code from a pulse injection detection device at the power receiving side;
the pulse injection power receiving side module is configured to generate a power receiving side branch line code for topology identification, the power receiving side branch line code comprises a name of a meter box, a meter box code and a line code, and the generated power receiving side branch line code forms a power receiving side control instruction; injecting the power receiving side control command into a pulse injection detection device on the power receiving side, and receiving a power receiving side branch line code from the pulse injection detection device on the station area side;
the branch line matching module is configured to match the station area side branch line codes and the power receiving side branch line codes injected and received by the pulse injection detection device on the station area side or the power receiving side, and establish a station area, branch lines and meter box connection relation topological sequence;
and the topological graph generation module is configured to be used for calculating the similarity and the correlation of the topological sequence and determining the topological structure and the change of the low-voltage distribution network at a certain moment.
The invention is beneficial to sensing the situation data of the low-voltage distribution network in real time through the communication mode of the electric power broadband carrier. On the basis, real-time situation fine judgment and fault trend prediction technology of a big data framework is applied, monitoring data of low-voltage distribution points are calculated and analyzed through a deduction formula, and predictive diagnosis is conducted on the operation state and the fault trend of the low-voltage network.
The topological structure of the invention can carry out topological electrification on a 400V low-voltage network and monitor the real-time situation of the low-voltage network. By the topology identification method and the topology identification device, the accurate positioning of the low-voltage network fault and the SOE event are automatically reported or compared and analyzed through the switch fault information, and the power failure phase, the fault position and the power failure client are comprehensively judged.
The method assists in power distribution automation prediction diagnosis, conducts deductive calculation analysis based on real-time situation perception low-voltage distribution monitoring data, conducts predictive diagnosis on the operation state and the fault trend of the low-voltage network, and pushes a power distribution automation system.
The invention realizes the collection, transmission and processing of the power consumption data of the 400V low-voltage device of the power distribution automation system; the power line broadband carrier network suitable for the distribution network state platform for real-time situation awareness is established, a low-voltage sensing terminal based on a broadband carrier module is developed, and real-time situation monitoring and active reporting of event records of cut-off equipment such as subsections, households and the like under the power line broadband carrier network platform are achieved. The invention is beneficial to improving the operation and maintenance work efficiency of the 400-volt low-voltage network, supports the high-quality service of the distribution network from passive to active, realizes the panoramic visualization management work of the 10-400-volt real-time situation, realizes the panoramic perception of the 10-400-volt intelligent distribution network situation, and solves the problem that the distribution network monitoring of the distribution network extends from 10 kilovolts to 400 volts.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A low-voltage distribution network topology identification method is characterized by comprising the following steps:
generating a zone side branch line code for topology identification, wherein the zone side branch line code comprises a name of a zone to be injected, a zone code and a line code, and the generated zone side branch line code forms a zone side control instruction; injecting the station side control command into a pulse injection detection device at the station side, and receiving a station side branch line code from a pulse injection detection device at the power receiving side;
generating a branch line code of a power receiving side for topology identification, wherein the branch line code of the power receiving side comprises the name of a meter box, the meter box code and a line code, and the generated branch line code of the power receiving side forms a control instruction of the power receiving side; injecting the power receiving side control command into a pulse injection detection device on the power receiving side, and receiving a power receiving side branch line code from the pulse injection detection device on the station area side;
matching according to the station side and power receiving side branch line codes received by the pulse injection detection devices at the power receiving side and the station side, and establishing a station area, branch lines and meter box connection relation topological sequence;
and calculating the similarity and the correlation of the topological sequences, and determining the topological structure and the change of the low-voltage distribution network.
2. The low voltage distribution network topology identification method according to claim 1,
the station side control instruction comprises a command byte, a segmentation character and a station side branch line code;
the power-receiving side control instruction comprises a command byte, a segmentation character and a power-receiving side branch line code.
3. The low voltage distribution network topology identification method according to claim 1,
the pulse injection detection device for injecting the station side control command to the station side, wherein the reception of the station side branch line code from the pulse injection detection device on the power receiving side includes:
forming distortion pulses in a pulse injection detection device at the station side by using a station side control command and injecting the distortion pulses into a low-voltage distribution network;
the distorted pulse is demodulated in a pulse injection detection device on the power receiving side to extract a branch line code on the station side.
4. The low voltage distribution network topology identification method according to claim 3,
the step of injecting the station side control command into the pulse injection detection device at the station side to form distortion pulses and inject the distortion pulses into the low-voltage distribution network line comprises the following steps:
after the pulse injection detection device at the station area side receives the injected station area side control instruction, establishing a branch relation between the line code and the branch line;
injecting carrier signals for different branch lines in a branch relationship;
modulating branch line codes to carrier signals by adopting an FSK/BPSK modulation technology to obtain modulated distortion pulse signals;
and injecting the obtained distorted pulse signals into a distribution network line of the transformer area by a method for modulating power frequency voltage signals.
5. The low voltage distribution network topology identification method according to claim 4,
the step of demodulating the distorted pulse in the pulse injection detection device at the power receiving side and extracting the branch line code at the station area side comprises the following steps:
the distorted pulse signals are transmitted to a user line through a power line carrier, and the pulse injection detection device on the power receiving side carries out filtering processing on the distorted pulse signals to obtain detected signals on the user line;
fourier transform is carried out on the detected signal, and a carrier list of the received distorted pulse signal is extracted;
and on the basis of the carrier list, constructing the molecular weight of each carrier and demodulating the molecular weight to obtain the branch line code of the station area side.
6. The method according to claim 3, wherein the step of injecting the control command of the power receiving side into the pulse injection detection device of the power receiving side, and the step of receiving the branch line code of the power receiving side from the pulse injection detection device of the station side comprises:
forming a distortion pulse in a pulse injection detection device at the power receiving side by a power receiving side control command and injecting the distortion pulse into a low-voltage distribution network line;
the distorted pulse is demodulated in a pulse injection detection device on the station side to extract a power receiving side branch line code.
7. The low voltage distribution network topology identification method according to claim 6,
the power receiving side control command forms distortion pulses in a pulse injection detection device at the power receiving side and injects the distortion pulses into a low-voltage distribution network line, and the steps are as follows:
after the pulse injection detection device at the power receiving side receives the injected power receiving side control instruction, establishing a branch relation between a line code and a meter box;
injecting carrier signals for different branch lines in a branch relationship;
modulating branch line codes to carrier signals by adopting an FSK/BPSK modulation technology to obtain modulated distortion pulse signals;
and injecting the obtained distortion pulse signal into a low-voltage distribution network line by a method of modulating a power frequency current signal.
8. The low voltage distribution network topology identification method according to claim 7,
the step of demodulating the distorted pulse in the pulse injection detection device at the station area side to extract the branch line code at the power receiving side comprises the following steps:
the distorted pulse signal is transmitted to the transformer area through a power line carrier, and the distorted pulse signal is filtered by a filter in a pulse injection detection device at the transformer area side to obtain a detection signal on a subscriber line;
fourier transform is carried out on the detected signal, and a carrier list of the received distorted pulse signal is extracted;
and on the basis of the carrier list, constructing the molecular weight of each carrier and demodulating the molecular weight to obtain the branch line code of the power receiving side.
9. The low voltage distribution network topology identification method according to claim 8,
the steps of determining the topological structure and the change of the low-voltage distribution network are specifically as follows:
eliminating the record of the inconsistency of the carrier molecular weight and the distorted pulse signal;
constructing a branch line relation according to the list information after the inconsistent frequency information is removed;
if a plurality of recorded branch line codes are the same and have a common carrier frequency in the constructed branch line relationship, the user nodes belong to the same branch line, and the branch line relationship is adjusted according to the principle;
if the line codes of the two user nodes in the distribution area are the same, the two user nodes are in the same distribution area;
and if the two user nodes belong to the same region, determining the node level according to the number of the carrier frequencies and the number of the branch line codes in the list, and finally determining the topological structure and the change of the low-voltage distribution network.
10. A low voltage distribution network topology identification device, characterized by comprising:
the pulse injection station area side module is configured to generate a station area side branch line code for topology identification, the station area side branch line code comprises a name of a station area to be injected, a station area code and a line code, and the generated station area side branch line code forms a station area side control instruction; injecting the station side control command into a pulse injection detection device at the station side, and receiving a station side branch line code from a pulse injection detection device at the power receiving side;
the pulse injection power receiving side module is configured to generate a power receiving side branch line code for topology identification, the power receiving side branch line code comprises a name of a meter box, a meter box code and a line code, and the generated power receiving side branch line code forms a power receiving side control instruction; injecting the power receiving side control command into a pulse injection detection device on the power receiving side, and receiving a power receiving side branch line code from the pulse injection detection device on the station area side;
the branch line matching module is configured to match the station side branch line codes and the power receiving side branch line codes received by the pulse injection detection devices on the power receiving side and the station side, and establish a station area, branch lines and meter box connection relation topological sequence; and
and the topological graph generation module is configured for calculating similarity and correlation of the topological sequences and determining the topological structure and the change of the low-voltage distribution network at a certain moment.
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