CN111668835A - Network topology identification method applied to low-voltage distribution network - Google Patents
Network topology identification method applied to low-voltage distribution network Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
A network topology identification method applied to a low-voltage distribution network belongs to the field of electric power system application. The method is characterized in that: the method comprises the following steps: step 1001, starting topology identification; step 1002, searching all identification terminals in the current network; step 1003, the source terminal sends a command for starting to identify the target terminal; step 1004, the target terminal sends an identification signal to the network; step 1005, recording and broadcasting and processing signals in the line by a plurality of terminals in the network; step 1006, whether all the identification terminals in the network are identified or not is judged; step 1007, switching target identification terminals; step 1008, the source terminal forms a network identification matrix; in step 1009, the source terminal forms a topology identification table. In the network topology identification method applied to the low-voltage distribution network, the distribution terminal network topology graph is determined according to the single circulation path of the feedback signal, additional equipment is not needed, and the influence on the distribution network is small.
Description
Technical Field
A network topology identification method applied to a low-voltage distribution network belongs to the field of electric power system application.
Background
In the field of power systems, a low-voltage distribution network mainly refers to a distribution network with the voltage not higher than 400V, a radial topological structure is formed by taking the secondary side of a distribution transformer as a source point, and the topological structure is changed due to manual intervention during operation, so that the topological relation is wrong or lost. The deletion of the topological structure seriously affects the rapid troubleshooting of a fault source, the regional leakage current, the electric arc, the line loss calculation, the low-voltage fault location and the like, so that the rapid recovery of a fault power grid and the rapid removal and isolation of the fault are affected.
The traditional low-voltage distribution network topology identification detection method mainly comprises the following steps:
1. and the manual inspection means is used for manually carrying out general inspection section by utilizing a handheld terminal. The low-voltage distribution network has multiple branches and nodes, the manual routing inspection efficiency is low, the cost is high, errors are easy to occur, and the topological information of the network cannot be accurately acquired in real time.
2. The method combines the power carrier signal method or the pulse current method with the power carrier signal method. The power line carrier signal method can easily cause station area identification errors due to the conditions of common high-voltage serial lines, common ground serial lines, cable coupling and the like, and the pulse current method cannot be well integrated in a carrier electric energy meter and needs a cleaner station area field noise environment.
3. The transformer outlet side is externally provided with a station area identifier to generate a long-time short-time fault signal sequence: the station area address and phase information are analyzed and identified by the terminal identification module, and the station area attribution and phase identification can be avoided, but the short-time short-circuit current is related to the distribution transformation capacity, the short-circuit current is large and is at least more than 20A, and the potential safety hazard of operation exists.
4. And performing data statistical analysis by monitoring the phase deviation according to the phase difference inconsistency of different distribution transformers during operation. The scheme requires extremely accurate phase measurement, and the practical application is difficult to realize.
5. According to the big data statistics method, big data analysis is carried out on the acquired electricity consumption data of the user electricity meter end to obtain a topological relation graph, but nodes which are not provided with electricity meters cannot be associated to cause incompleteness of a topological structure.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, and provides the network topology identification method which is applied to the low-voltage distribution network and has small influence on the distribution network, wherein the network topology graph of the distribution terminal is determined according to the single circulation path of the feedback signal, and no additional equipment is needed.
The technical scheme adopted by the invention for solving the technical problems is as follows: the network topology identification method applied to the low-voltage distribution network is characterized by comprising the following steps: the method comprises the following steps:
and step 1009, the source terminal forms a network map for identifying the terminal topology according to the record table.
Preferably, the identification signal generating circuit in step 1004 includes a rectifier bridge circuit, an identification signal isolating circuit, a terminal application identification circuit, an isolation control signal generating module, a switch circuit, and a resistive load. The alternating current is rectified into a direct current signal through the rectifier bridge circuit and then is connected with the input end of the identification signal isolation circuit, the output end of the identification signal isolation circuit is connected with the input end of the terminal application load circuit, the output end of the identification signal isolation terminal application load circuit is connected with the input end of the isolation control signal generation module, the output end of the isolation control signal generation module is connected with the input end of the switch circuit, and the output end of the switch circuit is connected between the rectifier bridge circuit and the identification signal isolation circuit through a resistive load.
Preferably, the isolation control signal generation module controls to output a PWM signal with a duty ratio of 50% and a frequency of 240 Hz.
Preferably, in step 1005, the detection criterion for detecting the transmission identification signal is: the identification terminal performs spectrum analysis on the sampled points by using Fourier transform, finds whether frequency signals with correlation difference of 100Hz and 190Hz are present or not, if the frequency signals are present, the identification signal is detected, the detection result is marked as '1', and if the frequency signals are not present, the identification signal is not detected, the detection result is marked as '0'.
Preferably, in step 1003, the source terminal sends the command to the whole power distribution network 5 times at 50ms interval frequency in a broadcast manner when sending the command to the power distribution network.
Preferably, a signal output end of the identification signal generating circuit in the identification terminal is connected into any phase line of the distribution network, a signal receiving end of the identification terminal is simultaneously connected into three-phase lines, and the three-phase signals are superposed and summed through the operational amplifier.
Compared with the prior art, the invention has the beneficial effects that:
1. in the network topology identification method applied to the low-voltage distribution network, the distribution terminal network topology graph is determined according to the single circulation path of the feedback signal, additional equipment is not needed, and the influence on the distribution network is small.
2. When the source terminal sends the command to the power distribution network, the source terminal sends the command to the whole power distribution network for 5 times in a broadcasting mode according to the 50ms interval frequency, and the reliability of an HPLC communication mode is improved.
3. By arranging the signal identification isolation circuit, the isolation between the identification signal and the terminal application load circuit is realized, and the identification signal is prevented from interfering with the circuit load behind.
Drawings
Fig. 1 is a flowchart of a network topology identification method applied to a low-voltage distribution network.
Fig. 2 is a schematic block diagram of an identification signal generating circuit.
Fig. 3 is a schematic diagram of an identification signal generating circuit.
Fig. 4 is a schematic diagram of the identification terminal signal transmission and reception setting.
Fig. 5 is a schematic diagram of an example network topology of a low voltage distribution network.
Detailed Description
Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further described with reference to fig. 1 to 5.
As shown in fig. 1, a network topology identification method applied to a low voltage distribution network includes the following steps:
and the source terminal starts to perform topology identification on the whole power distribution network.
the source terminal looks for other terminals in the distribution network. The source terminal is a distribution terminal connected to the secondary side of the distribution transformer, and the identification terminal is a distribution terminal at other positions in the distribution network.
the source terminal sends a command for starting to identify the target terminal to the whole power distribution network through an HPLC (high-speed power line carrier, also called as a broadband power line carrier), informs all identification terminals in the power distribution network of preparing to start a task of topology identification, and in the command, the source terminal also designates a certain identification terminal in the power distribution network, namely the target terminal sends a feedback signal to the source terminal after receiving the command.
In order to overcome the reliability problem of the HPLC communication method, the source terminal issues commands to the entire distribution network 5 times at 50ms interval frequency in a broadcast manner when transmitting the commands to the distribution network.
after receiving the command sent by the source terminal, the target terminal in the power distribution network sends an identification signal through any phase line of the identification signal generating circuit.
As shown in fig. 2, the identification signal generating circuit includes a rectifier bridge circuit, an identification signal isolating circuit, a terminal application identification circuit, an isolation control signal generating module, a switch circuit, and a resistive load. The alternating current is rectified into a direct current signal through the rectifier bridge circuit and then is connected with the input end of the identification signal isolation circuit, the output end of the identification signal isolation circuit is connected with the input end of the terminal application load circuit, the output end of the identification signal isolation terminal application load circuit is connected with the input end of the isolation control signal generation module, the output end of the isolation control signal generation module is connected with the input end of the switch circuit, and the output end of the switch circuit is connected between the rectifier bridge circuit and the identification signal isolation circuit through a resistive load.
The signal identification isolation circuit is used for realizing the isolation between the identification signal and a terminal application load circuit and preventing the identification signal from interfering with the following circuit load. The resistive load, the switch circuit and the isolation control signal generation module are used for generating identification signals, and the isolation control signal generation module generates PWM signals with duty ratio of 50% and frequency of 240 Hz. The control signal controls the conduction and the judgment of the switch circuit to realize the regular on-off of the resistive load. In order to enable the identification signal to be more clearly identified in the circuit, the control signal generator continuously sends PWM pulses with 4-8 periods.
Referring to fig. 3, the identification signal generating circuit includes an integrated chip U1 of type B0515S-1W and an optocoupler chip U2 of type M61L 500E. Pins 1 and 3 of the integrated chip U1 are respectively connected with a reference ground GND and a ground PGND, a pin 2 series capacitor C1 is connected with the ground PGND, a pin 4 leads out a signal VMOS15, and a capacitor C2 is connected in parallel between the pin 3 and the pin 4.
The 4 pins of the integrated chip U1 are also connected with one ends of resistors R2-R3 and the cathode of a voltage regulator tube ZD1, and the other end of the resistor R3 and the anode of the voltage regulator tube ZD1 are connected with the ground PGND. The power supply signal VCC200 is connected to both the other end of the resistor R2 and one end of the fuse F1, the other end of the fuse F1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to pin 1 of the terminal J1, pin 2 of the terminal J1 is connected to the drain of the MOS transistor Q1, the gate of the MOS transistor Q1 is connected to one end of the resistor R4, and the other end of the resistor R4 and the source of the MOS transistor Q1 are connected to the ground PGND.
The grid of MOS pipe Q1 still connects the 5 feet of opto-coupler signal U2 simultaneously, and signal VMOS15 is connected to the 6 feet of opto-coupler chip U2, and the 4 feet of opto-coupler chip U2 are connected earth PGND. The 5V power supply series resistor R1 and the light emitting diode D2 are connected with the 1 pin of the optocoupler chip U2.
after receiving the control signal of the source terminal, each identification terminal in the power distribution network starts to detect the transmission identification signal flowing through the line, and records the detection result. With reference to fig. 4, the identification terminal in the power distribution network adopts single-phase transmission during transmission and three-phase reception during reception to prevent missing signals, and the identification terminal converts single-phase current signals into voltage signals through an electronic current transformer and sends the voltage signals into a signal conditioning and acquisition circuit after superposition and summation of the three-phase signals by using an operational amplifier. And the singlechip is used for driving the analog-to-digital conversion chip to realize recording and broadcasting of the identification signal, and the sampling rate is set to 10 kbps.
The identification terminal performs spectrum analysis on 10k points obtained by sampling by using Fourier transform, and finds whether frequency signals with correlation difference of 100Hz between 190Hz and 290Hz exist or not to judge whether the identification signals pass through the terminal node or not. If so, it is noted as "1" in the record, otherwise it is noted as "0". And the identification terminal in the power distribution network forms a statistical table of the identification terminal according to the identification record of the signal in the power distribution network.
the source terminal judges whether the identification of all the identification terminals in the power distribution network is finished, if the identification of all the identification terminals is finished, step 1008 is executed, and if the identification of all the identification terminals is not finished, step 1007 is executed.
the source terminal replaces another identified terminal in the distribution network as the target terminal and returns to step 1003.
assume that eight identification terminals are provided in the distribution network: the identification terminals A-H, the source terminal collects information tables of whether each identification terminal in the distribution network detects current signals or not, and a topological relation statistical table shown in the table 1 is generated.
TABLE 1 statistical table of signal detection results of identification terminals
In table 1, each identification terminal listed from the second row to the next row represents an identification terminal that receives a current signal, and each identification terminal listed to the right from the third row represents an identification terminal that injects a current signal, i.e., rows 2 to 9 in table 1 respectively represent: when an identification terminal A injects a signal, the identification terminal A-an identification terminal H detect the signal; … …, respectively; and when the identification terminal H injects a signal, the identification terminals A-H detect the signal. Columns 3 to 10 represent: the identification terminal A detects the detection result when current signals are injected into the identification terminals A-H; … …, respectively; and the identification terminal H is used for detecting the detection result when the identification terminals A-H inject current signals.
the source terminal forms a network graph for identifying the terminal topology according to the record table, and the method comprises the following specific steps:
In step 2, the source terminal searches for data in a column, but data in a column not having "1" is not recorded, and the identification terminal corresponding to the record "1" is located in the same branch line, and data recorded as "0" is located in another branch line. Taking the 4 th column corresponding to the identification terminals as an example, the records of the identification terminals B to E are "1", which means that the identification terminals B to E are located in the same branch line, and the identification terminals a, F, G and H are not located in the same branch line as the identification terminals B to E. Similarly, as can be seen from the 5 th column where the identification terminal C is located, the identification terminal C and the identification terminal D are located in the same branch circuit at the same time in the branch circuits where the identification terminals B to E are located.
Since the identification terminal A is known to be located at the root node of the trunk line, searching is carried out from the 4 th row where the identification terminal B is located, wherein the row indicates that only the identification terminal A and the identification terminal B detect current signals when the identification terminal B injects the current signals into the line, and the upstream identification terminal on the current path of the identification terminal B only has the identification terminal A;
continuously searching a 5 th row where the identification terminal C is located according to the rows, and when the identification terminal C injects a current signal into a line, detecting the current signal by the identification terminal A, the identification terminal B and the identification terminal C, wherein the identification terminal A and the identification terminal B are both upstream identification terminals on a current path of the identification terminal C;
continuously searching the identification terminal D according to rows, when the identification terminal D injects a current signal into a circuit, detecting the current signal by the identification terminal A, the identification terminal B, the identification terminal C and the identification terminal D, and indicating that the identification terminal A, the identification terminal B and the identification terminal C are all upstream identification terminals on a current path of the identification terminal D;
continuously searching the identification terminal E according to the row, when the identification terminal E injects a current signal into the line, the identification terminal A, the identification terminal B and the identification terminal E detect the current signal, and the identification terminal A and the identification terminal B are explained as an upstream identification terminal on a current path of the identification terminal E; and the terminals B to E are located in the same branch line, and the terminal E is located on a branch line between the terminal B and the terminal C.
Continuously searching the identification terminal F according to the line, and when the identification terminal F injects a current signal into the line, only the identification terminal A detects the current signal, which indicates that the identification terminal A is an upstream identification terminal on the current path of the identification terminal F; and the identification terminals B, C, D and E do not detect the current signals, which indicates that the identification terminals B, C, D and E are not the identification terminals on the current path of the identification terminal F.
And continuously searching the identification terminal G according to the line, when the identification terminal G injects a current signal into the line, detecting the current signal by the identification terminal A, the identification terminal F and the identification terminal G, and detecting no current signal by the identification terminals B to E and H, wherein the identification terminals B to E are not identification terminals on the current path of the identification terminal G, and the identification terminal F is an upstream identification terminal on the current path of the identification terminal G.
And continuously searching the identification terminal H according to the line, when the identification terminal H injects a current signal into the line, the identification terminal A, the identification terminal F and the identification terminal H detect the current signal, and the identification terminals B to E and the identification terminal G do not detect the current signal, which indicates that the identification terminals B to E are not identification terminals on the current path of the identification terminal G, and the identification terminal F is an upstream identification terminal on the current path of the identification terminal G. According to the above judgment, the network diagram of the identified terminal topology shown in fig. 5 is finally obtained.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. A network topology identification method applied to a low-voltage distribution network is characterized by comprising the following steps: the method comprises the following steps:
step 1001, starting topology identification;
step 1002, searching all identification terminals in the current network;
step 1003, the source terminal sends a command for starting to identify the target terminal to the whole power distribution network, all the identification terminals in the power distribution network prepare for starting a task of topology identification, meanwhile, the source terminal also designates a certain identified terminal in the power distribution network as the target terminal, and controls the target terminal to send a feedback signal to the source terminal after receiving the command;
step 1004, after receiving the command sent by the source terminal, the target terminal sends an identification signal through any phase line of the identification signal generating circuit;
step 1005, after receiving the control signal of the source terminal, each identification terminal in the power distribution network detects the transmission identification signal flowing through the line and records the detection result;
step 1006, the source terminal judges whether the identification of all the identification terminals in the power distribution network is completed, if the identification of all the identification terminals is completed, step 1008 is executed, and if the identification of all the identification terminals is not completed, step 1007 is executed;
step 1007, the source terminal replaces another identification terminal in the distribution network as a target terminal, and returns to step 1003;
step 1008, the source terminal collects information tables of whether each identification terminal in the power distribution network detects a current signal, and generates a topological relation statistical table;
and step 1009, the source terminal forms a network map for identifying the terminal topology according to the record table.
2. The method for identifying the network topology applied to the low-voltage distribution network according to claim 1, characterized in that: the identification signal generating circuit in step 1004 comprises a rectifier bridge circuit, an identification signal isolating circuit, a terminal application identification circuit, an isolation control signal generating module, a switch circuit and a resistive load; the alternating current is rectified into a direct current signal through the rectifier bridge circuit and then is connected with the input end of the identification signal isolation circuit, the output end of the identification signal isolation circuit is connected with the input end of the terminal application load circuit, the output end of the identification signal isolation terminal application load circuit is connected with the input end of the isolation control signal generation module, the output end of the isolation control signal generation module is connected with the input end of the switch circuit, and the output end of the switch circuit is connected between the rectifier bridge circuit and the identification signal isolation circuit through a resistive load.
3. The method for identifying the network topology applied to the low-voltage distribution network according to claim 2, wherein: the isolation control signal generation module controls and outputs a PWM signal with the duty ratio of 50% and the frequency of 240 Hz.
4. The method for identifying the network topology applied to the low-voltage distribution network according to claim 1, characterized in that: in step 1005, the detection of the transmitted identification signal is based on: the identification terminal performs spectrum analysis on the sampled points by using Fourier transform, finds whether frequency signals with correlation difference of 100Hz and 190Hz are present or not, if the frequency signals are present, the identification signal is detected, the detection result is marked as '1', and if the frequency signals are not present, the identification signal is not detected, the detection result is marked as '0'.
5. The method for identifying the network topology applied to the low-voltage distribution network according to claim 1, characterized in that: in step 1003, the source terminal sends 5 times commands to the whole power distribution network at 50ms interval frequency in a broadcast manner when sending commands to the power distribution network.
6. The method for identifying the network topology applied to the low-voltage distribution network according to claim 1, characterized in that: the signal output end of the identification signal generating circuit in the identification terminal is connected into any phase line of the distribution network, the signal receiving end of the identification terminal is simultaneously connected into three-phase lines, and three-phase signals are superposed and summed through the operational amplifier.
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