CN111030097A - Low-voltage distribution network platform area topology identification method and system - Google Patents
Low-voltage distribution network platform area topology identification method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for identifying the topology of a low-voltage distribution network area.A central node of the area sends central node identification signals to all nodes of the area through three-phase power supply lines A, B and C, and each branch node and leaf node in the area receive and analyze the identification signals; each branch node respectively sends branch node identification signals to each lower node layer by layer, and the lower nodes of the branch nodes receive and analyze the identification signals; the branch nodes and the leaf nodes return the ID identification and the phase sequence identification of the superior node obtained by analysis and the identification information of the node to the central node of the transformer area; and reading and solving the central node of the transformer area to obtain the topological structure of the low-voltage transformer area. The invention synchronously couples the identification signal to the three-phase power supply line A, B and the C phase, avoids crosstalk between phase lines caused by single-phase transmission of topology identification signals in the prior art, and simultaneously improves the efficiency of topology identification of the low-voltage distribution area by simultaneously transmitting the identification signals by the three phases.
Description
Technical Field
The invention relates to the field of low-voltage power distribution, in particular to a method and a system for identifying topology of a low-voltage power distribution network area.
Background
The automatic identification of the topological relation of the low-voltage lines in the distribution area is actually to reliably obtain the connection relation between the electric equipment directly connected with the low-voltage lines and the low-voltage outgoing line cabinet in the distribution area. The power grid company is actively developing the construction work of the power internet of things, and the topology of the power distribution grid electric network is important for improving the management level of power supply reliability and improving the fault location of a power supply line. Due to the large number of power distribution areas and the complex electrical wiring, the phenomenon of private overlapping and misconnection also exists; although the electric power company is generally checked by an electric energy meter, it is difficult to accurately grasp the topology of the electric network of the distribution station area in time.
At present, the common method for realizing the topology identification of the power distribution station area circuit comprises the following steps: (1) the method has the advantages of being high in accuracy, but contradiction between distance and power exists, namely the longer the transformer area distance is, the larger the required pulse current is, the larger the influence on a power grid is, and meanwhile, when the line is overloaded, the pulse current is not easy to identify. (2) The method is characterized by low cost, simplicity and feasibility, but the carrier networking border-crossing phenomenon exists, the recognition rate is low, and the method is unreliable and stable. (3) Pulse current is injected into the branch of the line, and manual method is adopted to collect and position point by point. (4) The big data identification method is used for acquiring the topological structure of the transformer area by utilizing the correlation of voltage, current, power and electric energy data, and further development and verification are needed.
At present, crosstalk between signal lines exists in the topology identification of the power distribution area lines, so that data transmission loss and transmission errors can be caused, and the topology positioning of an electric network of a power distribution low-voltage area is not facilitated.
Disclosure of Invention
The invention aims to provide a method for identifying the topology of a low-voltage distribution network area, which has higher reliability, aiming at the technical problem that crosstalk exists between signal lines of the existing method for identifying the topology of the low-voltage distribution network area based on the power line broadband carrier (HPLC) technology.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a method for identifying topology of a low voltage distribution network area, where the low voltage distribution network area includes a center node, branch nodes, and leaf nodes, and the method includes:
step one, a platform area central node sends platform area central node identification signals to all nodes of a local platform area, wherein the platform area central node identification signals comprise an ID (identity) and a phase sequence identity of the platform area central node; the station area central node identification signals are synchronously coupled to the three-phase power supply line A, B and the C phase, and each branch node and leaf node in the station area receive and analyze the station area central node identification signals;
step two, each branch node respectively sends branch node identification signals to each lower node layer by layer, the branch node identification signals are synchronously coupled to a three-phase power supply line A, B and a phase C, and the branch node identification signals comprise ID identifications and phase sequence identifications of the branch nodes; a subordinate node of the branch node receives and analyzes the branch node identification signal; the branch nodes and the leaf nodes transmit the ID identification and the phase sequence identification of the superior node obtained by analysis and the identification information of the node back to the central node of the transformer area through an HPLC power line;
and step three, reading and analyzing the slave node information of the branch node and the leaf node by the central node of the distribution area through a preset HPL communication unit to obtain a low-voltage distribution area topological structure.
Further, in order to make the method for identifying the topology of the transformer area more accurate, the method comprises the following specific steps that before the central node sends identification signals of the central node of the transformer area to all nodes of the transformer area, the time scale calibration of the zero point of the three-phase voltage signals of the transformer area is included:
respectively collecting zero crossing point time marks on three-phase power supply lines of a central node of the transformer area, and sending the zero crossing point time marks through a preset HPLC communication unit;
and each branch node and leaf node acquire zero-crossing time scales on a local three-phase power supply line, obtain errors by comparing the three-phase zero-crossing time scales of the central node of the station area received by a preset HPLC communication unit with the local three-phase zero-crossing time scales, and adjust the three-phase zero-crossing time scales of the local node according to the errors.
In order to make the low-voltage transformer area line topology identification method more accurate and reliable, a transformer area center node sends transformer area identification signals to all nodes in the transformer area by the adjusted phase, and the phase adjustment method comprises the following steps:
and monitoring the current in a zero line of the central node of the transformer area while transmitting the identification signal of the central node of the transformer area, and if the current of the zero line is greater than a preset threshold, adjusting the phase of the identification signal of the transformer area according to the current component with the signal frequency spectrum characteristic, so that the characteristic current of the signal in the zero line is smaller than the threshold.
Further, in order to solve the technical problem that signal crosstalk exists between different branch nodes in the topology identification method for the distribution network low-voltage distribution network, the method for issuing the branch node identification signal by each branch node and returning the identification signal by each branch node and each leaf node is as follows:
when the system is used for time synchronization, starting from a first branch node of a first stage, each node respectively sends a branch node identification signal and a time scale according to a given moment, and the branch node identification signal is sent, and meanwhile, a switch of a wave trap connected to a three-phase voltage incoming line end of the branch node is turned on;
the subordinate branch nodes and the corresponding leaf nodes which are subordinate to each branch node receive the identification signal to analyze, and determine the information of the subordinate node;
the branch node closes the wave trap switch;
the subordinate node sends the information of the subordinate node to a central node of the transformer area through a preset HPLC communication unit;
and repeating the steps until all the branch node and leaf node information is obtained.
Furthermore, after the system times, each node sends an identification signal at a preset time.
Further, the slave node information includes a node address and a device name.
In another aspect, a topology identification system for a low voltage distribution network region includes a central node, branch nodes and leaf nodes, and the system includes:
the central node identification signal processing module is arranged on the central node, and the non-central node identification signal processing modules are arranged on the branch nodes and the leaf nodes;
the central node identification signal processing module is used for sending a distribution area central node identification signal to all nodes of the distribution area through a three-phase power supply line A, B and a three-phase power supply line C, wherein the distribution area central node identification signal comprises an ID (identity) and a phase sequence identity of a distribution area central node;
the non-central node identification signal processing module is used for receiving and analyzing identification signals of other branch nodes in the station area central node identification signals through a three-phase power supply line A, B and a phase C; the non-central node identification signal processing module is further configured to send, layer by layer, to each lower node, a branch node identification signal coupled to the three-phase power supply line A, B and the C phase, where the branch node identification signal includes an ID identifier and a phase sequence identifier of the branch node;
the non-central node identification signal processing module is also used for receiving and analyzing the branch node identification signal;
the non-central node identification signal processing module shares a physical channel with an HPLC communication unit preset by the node equipment, and is used for the branch node and the leaf node to transmit the received ID and phase sequence identification of the superior node and the identification information of the node back to the central node of the transformer area through the preset HPLC communication unit;
the central node identification signal processing module shares a physical channel with an HPLC communication unit preset in central node equipment, and is used for the central node to read and analyze equipment information of the branch nodes and the leaf nodes through the preset HPLC communication unit to obtain a low-voltage distribution area topological structure.
Furthermore, the central node identification signal processing module comprises a clock synchronization unit and a signal amplifier, wherein the clock synchronization unit comprises a phase voltage zero-crossing detection module and a signal sequence synthesis unit connected with the phase voltage zero-crossing detection module, and the signal sequence synthesis unit is used for generating and outputting a pulse sequence according to a three-phase zero-crossing time scale acquired by the phase voltage zero-crossing detection module; the output end of the clock synchronization unit is connected to a signal amplifier, and the output end of the signal amplifier is coupled to an HPLC power line;
the non-central node identification signal processing module is also used for receiving a three-phase zero-crossing time scale of the central node of the platform area through a preset HPLC communication unit; and acquiring a zero-crossing time scale on a local three-phase power supply line, comparing the received three-phase zero-crossing time scale of the central node of the distribution room with the local three-phase zero-crossing time scale to obtain an error, and adjusting the three-phase zero-crossing time scale of the local node according to the error.
Furthermore, the central node identification signal processing module is also connected with a preset central node current detection module, and the current detection module is used for detecting zero line current of the central node of the transformer area while the central node of the transformer area sends an identification signal;
the central node identification signal processing module is used for adjusting the phase of three phases of the transmission station area identification signal according to the detected zero line current of the central node of the station area, so that the signal characteristic current in the zero line is smaller than a threshold value.
Further, the non-central node identification signal processing module further comprises a blocker, and the blocker is connected to the three-phase voltage incoming ends of the branch nodes and the leaf nodes.
The invention has the following beneficial technical effects:
according to the invention, the identification signals are synchronously coupled to the three-phase power supply line A, B and the C phase, so that crosstalk between phase lines caused by single-phase transmission of topology identification signals in the prior art is avoided, meanwhile, the three phases simultaneously transmit the identification signals, so that the efficiency of topology identification of a low-voltage transformer area is improved, and the branch nodes iteratively search lower-level nodes layer by layer, so that the speed of topology construction is improved;
the identification result is returned to the central node of the transformer area through the HPLC channel, the central node completes the construction and uploading of the topological graph of the transformer area, the identification signals of adjacent transformer areas are ensured not to be mutually coupled, the crosstalk of the transformer areas is avoided, the repeated investment is avoided by adopting the HPLC channel as a data channel, and the implementation cost is reduced;
according to the invention, the zero crossing point of the low-voltage power grid is calibrated, so that the influence of the transmission characteristic of a low-voltage line on the voltage zero crossing point is avoided; on the basis, the identification signal is transmitted, and the colleagues sending the identification signal of the central node detect the zero current of the central node, so that the identification signal in the zero line is ensured to be zero, the interference of the zero line on other phase lines is avoided, and the identification of the topology identification of the low-voltage transformer area is more accurate;
the switch of the wave trap is controlled while the branch nodes send the identification signals, so that the layer-by-layer isolation iterative search of the branch nodes is realized, the interference between the branch node signals is blocked, and the speed of topology construction is improved.
Drawings
FIG. 1 is a diagram of a low voltage grid architecture;
FIG. 2 is a block diagram of a low-voltage distribution room system in an embodiment of the present invention;
FIG. 3 is a flow chart of a method of an embodiment of the present invention;
fig. 4 is a flow chart of the identification of the platform area device according to the embodiment of the present invention;
FIG. 5 is a flow chart illustrating the identification of branch nodes and leaf nodes according to an embodiment of the present invention;
fig. 6 is a frame diagram of a central node signal identification module 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.
Fig. 1 is an application scenario of the present embodiment, and the present invention is applied to a low-voltage distribution network region, including a central node, a branch node, and a leaf node. Fig. 2 is a block diagram of an application of the prior art, in a specific application system, a central node of a distribution room is provided with a distribution room intelligent terminal, branch monitoring units are installed at branch nodes a1, B1 and C1, meter box detection units are installed at leaf nodes a11, a12, B11, B12 and C11, and devices located at a main node, devices located at branch nodes and meters located at leaf nodes are all pre-installed with their own HPLC communication modules.
In the first embodiment, a structure of a low-voltage distribution network area system is shown in fig. 1, and fig. 3 is a flow chart of a method in this embodiment; fig. 3 shows a method for identifying topology of a low-voltage distribution network distribution area, which includes the following steps:
the first step is as follows: transmitting, by a station center node (i.e., a root node in fig. 1), a station center node identification signal to all nodes (including nodes a1, B1, C1, a11, a12, B11, B12, and C11) in the station, where the station center node identification signal includes an ID and a phase sequence of the station center node; the station area central node identification signals are synchronously coupled to the three-phase power supply line A, B and the C phase, and each branch node and leaf node in the station area receive and analyze the station area central node identification signals;
the second step is that: the branch nodes transmit branch node identification signals to the lower nodes layer by layer, respectively, and the branch nodes in fig. 1 transmit the branch node identification signals to the lower nodes a11 and a12 (i.e., leaf nodes) on the same layer, that is, from the first branch node a 1; the branch node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and comprises an ID identification and a phase sequence identification of the branch node; a subordinate node of the branch node receives and analyzes the branch node identification signal; the branch nodes and the leaf nodes (branch node a1, leaf node a11, leaf node a 12) return the ID and phase sequence identifiers of the analyzed upper nodes to the central node of the transformer area (the upper nodes include the central node and the branch nodes) through the HPLC communication unit, that is, the first-stage branch nodes return the ID and phase sequence identifiers of the central node of the transformer area and the identification information of the node to the central node of the transformer area; the middle branch node transmits the ID identification and the phase sequence identification of the superior branch node and the identification information of the node back to the central node of the transformer area and transmits the identification information of the superior branch node, the ID identification and the phase sequence identification of the superior branch node and the identification information of the node back to the central node of the transformer area;
the second branch node B1 then sends a branch node identification signal to the next node B11, B12 (i.e., the leaf node); the branch node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and comprises an ID identification and a phase sequence identification of the branch node; a subordinate node of the branch node receives and analyzes the branch node identification signal; the branch nodes and the leaf nodes (B1, B11, B12) transmit the ID identification and the phase sequence identification of the upper node obtained by analysis back to the central node of the transformer area through an HPLC communication unit, and transmit the identification information of the node back to the central node of the transformer area;
the last third, i.e., the last branch node C1, sends a branch node identification signal to the next-level nodes C11, C12 (i.e., leaf nodes); the branch node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and comprises an ID identification and a phase sequence identification of the branch node; a subordinate node of the branch node receives and analyzes the branch node identification signal; the branch nodes and the leaf nodes (C1, C11 and C12) transmit the ID identification and the phase sequence identification of the upper node obtained by analysis back to the central node of the transformer area through an HPLC communication unit, and the identification information of the node is transmitted back to the central node of the transformer area; so far, all the branch nodes are traversed.
And step three, the central node of the distribution area reads and analyzes the information of the subordinate nodes of the branch nodes and the leaf nodes through a preset HPLC communication unit to obtain the topological structure of the low-voltage distribution area.
Embodiment two, fig. 4 is a flow chart of the identification of the platform area device according to the embodiment of the present invention; the method for identifying the topology of the low-voltage distribution network area provided by the embodiment comprises the following steps:
in the first step, the station area realizes time synchronization of the equipment in the station area through an HPLC communication unit, and node zero-crossing time scales are obtained through a node voltage zero-crossing detection circuit of each node sampling circuit detection line;
secondly, respectively collecting zero crossing time marks on a three-phase power supply line of a central node of the platform area, and sending the zero crossing time marks to an HPLC power line;
and each branch node and leaf node acquire zero-crossing time scales on a local three-phase power supply line, obtain errors by comparing the received three-phase zero-crossing time scales of the central node of the transformer area with local three-phase zero-crossing time scales, and adjust the three-phase zero-crossing time scales of the local node according to the errors. The voltage signals of the transformer area are correlated by calibrating the zero crossing point, the topology identification result is more accurate, and the influence of the transmission characteristic of a low-voltage line on the voltage zero crossing point is avoided;
thirdly, when the timing time is up, a central node identification signal is sent through the intelligent terminal submodule, wherein the station area central node identification signal comprises an ID (identity) and a phase sequence identification of the station area central node; the station center node identification signal is synchronously coupled to the power line through three phases A, B and C, and each branch node and leaf node are received and analyzed;
the central node of the fourth step area simultaneously monitors the current in the zero line while sending the identification signal, and adjusts the A, B, C three-phase of the identification signal according to the current component with the signal frequency spectrum characteristic, so that the signal characteristic current in the zero line is smaller than the threshold value; the zero line synthetic voltage is zero;
fifthly, adjusting the phase of the identification signal according to the threshold, and after the branch node receives the identification signal, acquiring a characteristic sequence of the identification signal through a signal conditioning circuit and an APC gain control circuit, thereby acquiring information of the central node, including a central node ID identification and a phase sequence identification;
each branch node sends branch node identification signals to each lower node layer by layer, the branch node identification signals are synchronously coupled to the three-phase power supply line A, B and the C phase, and the branch node identification signals comprise ID identifications and phase sequence identifications of the branch nodes; a subordinate node of the branch node receives and analyzes the branch node identification signal;
and sixthly, reading equipment identification information of the station area through an HPLC channel, returning the information and the slave node information of the node to the central node through an HPLC unit by the branch node, wherein the slave node information comprises the address of the branch node, the equipment name and the like.
Furthermore, in order to solve the technical problem that signal crosstalk exists between different branch nodes in the topology identification method of the low-voltage distribution network area of the power distribution network, a blocker is respectively added to the three-phase voltage at the inlet wire end of each branch unit,
the branch node is in the middle position of the network, the judgement of the subordination relation between the branch terminal and the leaf node of the subordinate at this position needs to be clear, fig. 5 is a branch node and leaf node identification flow chart, the invention adopts the method of three-phase synchronous signal isolation identification, namely, at the branch node upstream, the leaf node upstream installs the electronic wave trap of low-voltage circuit, the wave trap is controlled by the synchronous signal of this node, after the system obtains the node information of this network, further obtain each branch node and its leaf node information, the step is as follows:
when a first-step system is synchronized, the leaf nodes respectively send identification signals according to appointed time, three phases are simultaneously sent, and modulation information comprises: leaf node ID identification and phase sequence identification, and sending a time mark;
secondly, sending beacons and simultaneously opening a wave trap switch;
thirdly, the branch node and the leaf node receive the identification signal to analyze, and determine the ID of the subordinate branch node and the leaf node device;
fourthly, closing a wave trap switch;
fifthly, sending the information of the subordinate nodes to the intelligent monitoring terminal of the transformer area through an HPLC channel;
and the sixth step repeats the steps until all leaf node information is acquired.
The low-voltage topological network is constructed on the basis of obtaining the equipment in the transformer area, the equipment in the adjacent transformer area is prevented from being connected in series, the time for constructing the topological relation of the transformer area is shortened, and the efficiency and the accuracy of identifying the transformer, the line and the user are improved.
Example four: a topology identification system for a low-voltage distribution network region, wherein the low-voltage distribution network region comprises a central node, branch nodes and leaf nodes, the system comprising: the central node identification signal processing module is arranged on the central node, and the non-central node identification signal processing modules are arranged on the branch nodes and the leaf nodes;
the central node identification signal processing module, which can be embedded into a central node during specific implementation, can also be independently arranged at the central node, and is used for sending a station central node identification signal to all nodes of the station through a three-phase power supply line A, B and C, wherein the station central node identification signal comprises an ID (identity) and a phase sequence identity of the station central node;
the non-central node identification signal processing module is used for receiving and analyzing identification signals of other branch nodes in the station area central node identification signals through a three-phase power supply line A, B and a phase C; the non-central node identification signal processing module is further configured to send, by each branch node, a branch node identification signal to each subordinate node layer by layer, where the branch node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and the branch node identification signal includes an ID identifier and a phase sequence identifier of the branch node;
the non-central node identification signal processing module is also used for receiving and analyzing the branch node identification signal;
the non-central node identification signal processing module shares a physical channel with an HPLC communication unit preset by the node equipment, and is used for the branch node and the leaf node to transmit the received ID identifier and phase sequence identifier of the central node of the transformer area and the node identifier information back to the central node of the transformer area through the preset HPLC communication unit;
the central node identification signal processing module shares a physical channel with an HPLC communication unit preset in central node equipment, and is used for the central node to read and analyze equipment information of the branch nodes and the leaf nodes through the preset HPLC communication unit to obtain a low-voltage distribution area topological structure.
Based on the above embodiment, the central node identification signal processing module further includes a clock synchronization unit and a signal amplifier, the clock synchronization unit includes a phase voltage zero-crossing detection module and a signal sequence synthesis unit connected thereto, and the signal sequence synthesis unit is configured to generate and output a pulse sequence according to a three-phase zero-crossing time scale acquired by the phase voltage zero-crossing detection module; the output end of the clock synchronization unit is connected to a signal amplifier, and the output end of the signal amplifier is coupled to an HPLC power line through a preset HPLC communication unit;
fig. 6 is a frame diagram of a central node signal identification module according to an embodiment of the present invention.
As shown in fig. 6, the central node identification signal processing module is composed of a signal generating device, a signal control module, a signal amplifier, a clock synchronization unit, a signal receiving unit and a power supply module, wherein the signal control module and the control time synchronization unit acquire zero crossing time scales of a line and generate an SPWM sequence, the signal amplifier receives the SPWM sequence output by the time synchronization unit, amplifies the SPWM sequence, couples the SPWM sequence to a power line, monitors signal current in a zero line, adjusts the phase of the SPWM by the signal control module so that the signal current is smaller than a threshold value, and transmits signals on the receiving line of the signal receiving unit to the signal control module for analysis and processing after amplification and identification;
the signal receiving unit is coupled with the three-phase line through a high-voltage capacitor, outputs a modulated signal through a band-pass filter, an amplifier and an automatic gain adjusting circuit, a DSP (digital signal processor) arranged in the signal control module rapidly demodulates the signal and restores a signal sequence, and the sequence is a digital signal processed by white noise and comprises the following contents: phase sequence, station area identification code, node identification and the like.
The minimum differential mode voltage of the signal amplifier is less than 20uV, and the relative time of the corresponding power frequency zero crossing point is as follows: 45ns, the signal generating device sends a central node identification signal when the central node identification signal crosses zero, the identification signal is a modulated sine wave with the frequency of a sine fundamental wave of 12.0kHz, the identification signal is the same as the phase voltage phase, the synthesized zero-sequence current is zero, zero line coupling of carrier signals is avoided, and zero-common crosstalk of adjacent transformer areas is avoided.
The non-central node identification signal processing module is also used for receiving a three-phase zero-crossing time scale of the central node of the platform area through a preset HPLC communication unit; and acquiring a zero-crossing time scale on a local three-phase power supply line, comparing the received three-phase zero-crossing time scale of the central node of the distribution room with the local three-phase zero-crossing time scale to obtain an error, and adjusting the three-phase zero-crossing time scale of the local node according to the error.
Furthermore, the central node identification signal processing module is also connected with a preset central node current detection module, and the current detection module is used for detecting zero line current of the central node of the transformer area while the central node of the transformer area sends an identification signal;
the central node identification signal processing module is used for adjusting the phase of three phases of the transmission station area identification signal according to the detected zero line current of the central node of the station area, so that the signal characteristic current in the zero line is smaller than a threshold value.
Further, the non-central node identification signal processing module further comprises a blocker, and the blocker is connected to the three-phase voltage incoming ends of the branch nodes and the leaf nodes.
The system performs the following method:
a platform area central node sends platform area central node identification signals to all nodes of the platform area through a central node identification signal processing module center, wherein the platform area central node identification signals comprise ID identification and phase sequence identification of the platform area central node; the station area central node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and each branch node and leaf node in the station area receive and analyze the station area central node identification signal through the non-central node identification signal processing module;
step two, each branch node sends branch node identification signals to each lower node layer by layer through a non-central node identification signal processing module, the branch node identification signals are coupled to a three-phase power supply line A, B and a phase C, and the branch node identification signals comprise ID identifications and phase sequence identifications of the branch nodes; the lower node of the branch node receives and analyzes the branch node identification signal through the non-central node identification signal processing module; the branch node and the leaf node return the ID identification and the phase sequence identification of the superior node obtained by analysis to the central node of the transformer area through a preset HPLC communication unit, and return the identification information of the node to the central node of the transformer area;
and step three, the central node of the distribution room is provided with a non-central node identification signal processing module on a preset shared physical channel of the HPLC communication unit, and the information of the subordinate nodes of the branch nodes and the leaf nodes is read and analyzed through the preset HPLC communication unit to obtain the topological structure of the low-voltage distribution room.
Further, before the station center node sends the station center node identification signals to all nodes in the station, calibration of a time scale of a zero point of a three-phase voltage signal in the station is included, which specifically includes:
the central node identification signal processing module comprises a clock synchronization unit and a signal amplifier, wherein the clock synchronization unit comprises a phase voltage zero-crossing detection module and a signal sequence synthesis unit connected with the phase voltage zero-crossing detection module, and the signal sequence synthesis unit is used for generating and outputting a pulse sequence according to a three-phase zero-crossing time scale acquired by the phase voltage zero-crossing detection module; the output end of the clock synchronization unit is connected to a signal amplifier, and the output end of the signal amplifier is coupled to an HPLC power line through a preset HPLC communication unit;
the non-central node identification signal processing module is also used for receiving a three-phase zero-crossing time scale of the central node of the platform area through a preset HPLC communication unit; and acquiring a zero-crossing time scale on a local three-phase power supply line, comparing the received three-phase zero-crossing time scale of the central node of the distribution room with the local three-phase zero-crossing time scale to obtain an error, and adjusting the three-phase zero-crossing time scale of the local node according to the error.
On the basis of the above embodiment, the central node identification signal processing module is further connected with a preset central node current detection module, and the current detection module is used for detecting zero line current of the central node of the distribution room while the central node of the distribution room sends the identification signal;
the central node identification signal processing module is used for adjusting the phase of three phases of the transmission station area identification signal according to the detected zero line current of the central node of the station area, so that the signal characteristic current in the zero line is smaller than a threshold value.
On the basis of the above embodiment, the non-central node identification signal processing module further includes a blocker, which is connected to the incoming line ends of the three-phase voltages of the branch nodes and the leaf nodes.
When the system is used for time synchronization, starting from a first branch node of a first stage, each node respectively sends a branch node identification signal and a time scale through a non-central identification signal processing module according to a given moment, and the branch node identification signal is sent to simultaneously open a switch of a wave trap connected to a three-phase voltage incoming line end of the branch node;
the subordinate branch nodes and corresponding leaf nodes of each branch node receive the identification signal through the non-central identification signal processing module to analyze and determine the information of the subordinate node;
the branch node closes the wave trap switch;
the subordinate node sends the information of the subordinate node to a central node of the transformer area through a preset HPLC communication unit;
and repeating the steps until all the branch node and leaf node information is obtained.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A topology identification method for a low-voltage distribution network region comprises a central node, branch nodes and leaf nodes, and is characterized by comprising the following steps:
step one, a platform area central node sends platform area central node identification signals to all nodes of a local platform area, wherein the platform area central node identification signals comprise an ID (identity) and a phase sequence identity of the platform area central node; the station area central node identification signals are synchronously coupled to the three-phase power supply line A, B and the C phase, and each branch node and leaf node in the station area receive and analyze the station area central node identification signals;
step two, each branch node respectively sends branch node identification signals to each lower node layer by layer, the branch node identification signals are synchronously coupled to a three-phase power supply line A, B and a phase C, and the branch node identification signals comprise ID identifications and phase sequence identifications of the branch nodes; a subordinate node of the branch node receives and analyzes the branch node identification signal; the branch nodes and the leaf nodes transmit the ID identification and the phase sequence identification of the superior node obtained by analysis and the identification information of the node back to the central node of the transformer area through a preset HPLC communication unit;
and step three, the central node of the distribution area reads and analyzes the information of the subordinate nodes of the branch nodes and the leaf nodes through a preset HPLC communication unit to obtain the topological structure of the low-voltage distribution area.
2. The method for identifying the topology of the distribution network area of the low voltage according to claim 1, wherein before the central node of the distribution area sends identification signals of the central node of the distribution area to all nodes of the distribution area, the method comprises a calibration of a time scale of a zero point of a three-phase voltage signal of the distribution area, and comprises the following specific steps:
respectively collecting zero crossing point time marks on three-phase power supply lines of a central node of the transformer area, and sending the zero crossing point time marks through a preset HPLC communication unit;
and each branch node and leaf node acquire zero-crossing time scales on a local three-phase power supply line, obtain errors by comparing the three-phase zero-crossing time scales of the central node of the station area received by a preset HPLC communication unit with the local three-phase zero-crossing time scales, and adjust the three-phase zero-crossing time scales of the local node according to the errors.
3. The method for identifying the topology of the distribution network area of the low voltage according to claim 2, wherein the central node of the distribution area sends the identification signal of the distribution area to all the nodes of the distribution area with the adjusted phase, and the method for adjusting the phase comprises the following steps:
and monitoring the current in a zero line of the central node of the transformer area while transmitting the identification signal of the central node of the transformer area, and if the current of the zero line is greater than a preset threshold, adjusting the phase of the identification signal of the transformer area according to the current component with the signal frequency spectrum characteristic, so that the characteristic current of the signal in the zero line is smaller than the threshold.
4. The method for identifying the topology of the distribution network area of the low voltage according to claim 1, wherein the specific method in the second step is as follows:
when the system is used for time synchronization, starting from a first branch node of a first stage, each node respectively sends a branch node identification signal and a time scale according to a given moment, and the branch node identification signal is sent, and meanwhile, a switch of a wave trap connected to a three-phase voltage incoming line end of the branch node is turned on;
the subordinate branch nodes and the corresponding leaf nodes which are subordinate to each branch node receive the identification signal to analyze, and determine the information of the subordinate node;
the branch node closes the wave trap switch;
the subordinate node sends the information of the subordinate node to a central node of the transformer area through a preset HPLC communication unit;
and repeating the steps until all the branch node and leaf node information is obtained.
5. The method for identifying the topology of the distribution network area of the low voltage according to claim 1, wherein after the system performs time synchronization, each node sends an identification signal at a preset time.
6. The method of claim 1, wherein the slave node information includes a node address and a device name.
7. A topology identification system for a low-voltage distribution network region, wherein the low-voltage distribution network region comprises a central node, branch nodes and leaf nodes, the system comprising: the central node identification signal processing module is arranged on the central node, and the non-central node identification signal processing modules are arranged on the branch nodes and the leaf nodes;
the central node identification signal processing module is used for sending a distribution area central node identification signal to all nodes of the distribution area through a three-phase power supply line A, B and a three-phase power supply line C, wherein the distribution area central node identification signal comprises an ID (identity) and a phase sequence identity of a distribution area central node;
the non-central node identification signal processing module is used for receiving and analyzing identification signals of other branch nodes in the station area central node identification signals through a three-phase power supply line A, B and a phase C; the non-central node identification signal processing module is further configured to send, by each branch node, a branch node identification signal to each subordinate node layer by layer, where the branch node identification signal is synchronously coupled to the three-phase power supply line A, B and the C phase, and the branch node identification signal includes an ID identifier and a phase sequence identifier of the branch node;
the non-central node identification signal processing module is also used for receiving and analyzing the branch node identification signal;
the non-central node identification signal processing module shares a physical channel with an HPLC communication unit preset by the node equipment, and is used for the branch node and the leaf node to transmit the received ID and phase sequence identification of the central node of the transformer area or the ID and phase sequence identification of the superior node and the identification information of the node back to the central node of the transformer area through the preset HPLC communication unit;
the central node identification signal processing module shares a physical channel with an HPLC communication unit preset in central node equipment, and is used for the central node to read and analyze equipment information of the branch nodes and the leaf nodes through the preset HPLC communication unit to obtain a low-voltage distribution area topological structure.
8. A low voltage distribution network district topology identification system as claimed in claim 7,
the central node identification signal processing module comprises a clock synchronization unit and a signal amplifier, wherein the clock synchronization unit comprises a phase voltage zero-crossing detection module and a signal sequence synthesis unit connected with the phase voltage zero-crossing detection module, and the signal sequence synthesis unit is used for generating and outputting a pulse sequence according to a three-phase zero-crossing time scale acquired by the phase voltage zero-crossing detection module; the output end of the clock synchronization unit is connected to a signal amplifier, and the output end of the signal amplifier is synchronously coupled to an HPLC power line through a preset HPLC communication unit;
the non-central node identification signal processing module is also used for receiving a three-phase zero-crossing time scale of the central node of the platform area through a preset HPLC communication unit; and acquiring a zero-crossing time scale on a local three-phase power supply line, comparing the received three-phase zero-crossing time scale of the central node of the distribution room with the local three-phase zero-crossing time scale to obtain an error, and adjusting the three-phase zero-crossing time scale of the local node according to the error.
9. A topology identification system of distribution network areas of low voltage according to claim 7,
the central node identification signal processing module is also connected with a preset central node current detection module, and the current detection module is used for detecting zero line current of the central node of the transformer area while the central node of the transformer area sends an identification signal;
the central node identification signal processing module is used for adjusting the phase of three phases of the transmission station area identification signal according to the detected zero line current of the central node of the station area, so that the signal characteristic current in the zero line is smaller than a threshold value.
10. The topology identification system of a distribution network of low voltage according to claim 7, wherein said non-central node identification signal processing module further comprises a blocker, said blocker is connected to the branch node and the incoming line terminal of the leaf node three-phase voltage.
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