CN115276244A - Self-healing feeder automation control method based on 5G edge nodes - Google Patents
Self-healing feeder automation control method based on 5G edge nodes 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention belongs to the technical field of distribution automation control, and relates to a self-healing feeder automation control method based on 5G edge nodes, which comprises a discrete measurement and control terminal and edge nodes in a deployment station; constructing a network node topology model, and performing model verification by adopting a topology recognition algorithm based on an edge calculation model; the 5G communication device is used for acting network communication between all the interval units in the station which belongs to the edge node and the external edge node, so that inter-station peer-to-peer communication is realized; and acquiring protection measurement and control information of the switch in the station and the external edge node, and performing fault processing by adopting a self-healing feeder automation intelligent study and judgment algorithm. The invention can realize the rapid peer-to-peer communication among the power distribution equipment such as a 10kV line ring main unit, a pole-mounted switch, a switching station and the like, solves the problems of poor data interaction real-time performance, difficult coordination of protection fixed value grade difference, low application scene adaptability and the like in the existing feeder line automatic configuration mode, and realizes the rapid and accurate fault isolation and self-healing of the line in the power distribution area.
Description
Technical Field
The invention belongs to the technical field of distribution automation control, and relates to a self-healing feeder automation control method based on 5G edge nodes.
Background
In order to ensure the power supply reliability of the power distribution network and ensure that the automatic control of the power distribution network is efficient and reliable, the method has important significance for realizing millisecond positioning, second-level quick isolation and power supply recovery in a non-fault area within seconds. With the annual increase of the cabling rate of the 10kV cable lines in cities and towns, the 10kV cable lines are continuously put into operation and distributed with automatic equipment, most of the 10kV cable lines are not laid with optical fiber communication, a feeder automation control mode based on 4G wireless communication is limited by network communication delay and the safety of remote control of a master station, and fault local isolation and load transfer cannot be realized.
Therefore, the invention provides a self-healing feeder automation control method based on 5G edge nodes, which shares remote signaling and remote measuring information of all monitoring terminals to the edge nodes through edge calculation, can realize rapid peer-to-peer communication among power distribution equipment such as a 10kV line ring main unit, a column switch, a switching station and the like, and realizes rapid and accurate fault isolation and self-healing of a power distribution area line by combining low delay and high transmission reliability of 5G communication.
Disclosure of Invention
The invention aims to solve the problems of poor data interaction real-time performance, difficult matching of protection constant value difference, low application scene adaptability and the like in the conventional feeder automation configuration mode, and provides a self-healing feeder automation control method based on 5G edge nodes.
The invention provides a self-healing feeder automation control method based on 5G edge nodes, which comprises the following steps:
s1, deploying discrete measurement and control terminals in a station on a 10kV distribution network line, collecting telemetering analog quantity information and telemetering digital quantity information, configuring protection, measurement and switch operation functions, and sharing digital electrical information to an edge node of the station through IEC61850+ GOOSE among the discrete measurement and control terminals;
s2, constructing a network node topology model for representing the connection relation between the discrete measurement and control terminal and the subordinate edge nodes and the subscription relation between the edge nodes in the 10kV distribution network line, and performing model verification by adopting a topology recognition algorithm based on an edge calculation model;
s3, sharing information between the edge nodes and the 5G communication device, acting network communication between all the interval units in the station which belongs to the edge nodes and the external edge nodes, and transmitting the digital electrical information in the station obtained in the step S1 to the external edge nodes meeting the subscription relationship through the 5G network communication to realize inter-station peer-to-peer communication;
s4, collecting the in-station switch and external node protection measurement and control information by the edge node, and performing fault positioning, isolation and self-healing recovery power supply by adopting a self-healing type feeder automation intelligent study and judgment algorithm by combining the network node topology model obtained in the step S2;
further, the automatic control method further comprises the following steps: and S5, after the feeder automation fault processing is finished, repeating the steps S1-S4 to finish the self-healing processing of the line fault of the next power distribution area.
Further, the in-station discrete measurement and control terminal in the step S1 is installed at a 10kV distribution network cable line ring main unit and a switching station, and a column switch of a 10kV distribution network overhead line, and each terminal is configured with a group of three-phase protection CT and two groups of measurement PTs for automatically removing and isolating an inter-phase short-circuit fault and a single-phase ground fault in a user boundary, and ensuring power safety of a line and a non-fault user;
and S1, combining the edge node of the station with an embedded ARM/DSP processor, high-speed backboard connection, an industrial Ethernet switch, high-speed high-precision synchronous sampling and IEEE1588 network clock synchronization hardware technology to form an embedded communication and data processing platform based on a hierarchical distributed Ethernet structural design.
Furthermore, the embedded communication and data processing platform is used as a communication gateway for power distribution network control, measurement and relay protection, and functions of communication protocol conversion, data processing and graphic display between discrete measurement and control terminals are realized.
Further, the topology identification algorithm based on the edge calculation model in the step S2 is used for describing a distribution line network topology structure, and implementing topology verification of upstream and downstream switches of the line, and the topology identification algorithm includes edge node internal terminal connection relation verification and edge node subscription relation verification.
Further, the connection relation of the internal terminals of the edge nodes is verified, the collected telemetering analog quantity information uploaded by the edge nodes by the discrete measurement and control terminals in the station is used as a reference, the peak difference of the telemetering analog quantity of each terminal in an adjacent time period is used as a basis, and the upstream and downstream position relation of a 10kV line switch where each terminal is located is calculated and researched, and the specific calculation steps are as follows:
A. calculating outt 1 The time terminal number iskAnd
node voltage value ofU k AndU m ：
in the formulaU k Is composed oft 1 The time number iskThe voltage value is telemetered to the intra-node terminal of (1),U m is composed oft 1 The time number ismThe voltage value is telemetered to the terminal in the node,U 10 is composed oft 1 The 10kV system bus voltage value of the distribution line at the moment,I k is composed oft 1 The time number iskThe current value is telemetered to the intra-node terminal of (1),I m is composed oft 1 The time number ismThe intra-node terminals of (a) telemetry current values,R k is numbered askThe equivalent impedance value of the line at the switch position to which the terminal belongs in the node of (1),R m is numbered asmThe equivalent impedance value of the line at the switch position of the terminal in the node;
B. calculating the remote measurement trigger by taking the time of the remote measurement change value sent by the discrete measurement and control terminal in the station as a referencet 2 The time terminal number iskAnd
node voltage value of
And
：
in the formula
Is composed oft 2 The time number iskThe voltage value is telemetered to the intra-node terminal of (1),
is composed oft 2 The time number ismThe voltage value is telemetered to the intra-node terminal of (1),U 20 is composed oft 2 The 10kV system bus voltage value of the distribution line at any moment,
is composed oft 2 The time number iskThe current value is telemetered to the intra-node terminal of (1),
is composed oft 2 The time number ismThe intra-node terminal of (1) telemeters a current value;
C. will be provided witht 1 、t 2 The time number iskAndmcomparing the remote measurement voltage values of the discrete measurement and control terminals in the station, and calculating the voltage difference value of each terminal position
And
：
D. comparative analysis
And
calculating the difference between the two
When it is satisfied
And is provided with
Or is or
And is provided with
Time, terminalkThe associated line switch being located at the terminalmThe upper reaches of the circuit switch, otherwise, the lower reaches;
E. and D, repeating the steps A to D until the connection relations of all terminals in the edge nodes are verified, and stopping the algorithm.
Further, the subscription relationship among the edge nodes is checked by defining an edge node incidence matrixKIts dimension is equal to the number of edge nodes, so for the node containingxThe 10kV system network of each edge node defines elements in the matrix by adopting the following conditional equationk ij ：
Computing an evaluation matrix
When it is satisfied
And when the conditions are met, the connection subscription relationship among all edge nodes in the system is met, and the verification of the network node topology model is finished.
Further, step S4, the self-healing feeder automation intelligent study and judgment algorithm collects fault information through edge nodes, and realizes second-level fault self-healing by combining inter-station peer-to-peer communication, and specifically adopts the following steps:
s41, collecting over-current, under-voltage and zero sequence alarm fault information of a measurement and control terminal in the collection station by the edge node, carrying out peer-to-peer communication with the external edge node meeting the subscription relationship in the 10kV distribution network line, and if the 10kV distribution network line is shared by the edge nodenConstructing 1 x from each edge nodenOrder failure node matrix, secondiThe fault information collected by each edge node isf i The values are:
when the condition is satisfied:
s42, aiming at the edge node, adopting the network node topology model of the step S2kAnd (6) carrying out accurate positioning on the fault position by the measurement and control terminal: if the edge nodekIs shared byyThe terminal, the direction from the power supply point of the line to the interconnection switch is defined as the positive direction, the serial numbers of the superior and inferior relations of each terminal are determined through the check of the connection relation of the internal terminals of the edge nodes, when the first terminal is in the first orderjWhile the terminal receives the fault informationj+1The terminal has no fault information to be sent, namely the fault can be positioned at the second placejSwitch and the second switch to which the terminal belongsj+ 1The switch to which each terminal belongs;
s43, judging edge nodeskTo be treated withjRemote signaling digital quantity information of each terminal, searching switch attribute, and if the switch operation mode is a branch switch, edge nodekJudging terminaljSending a brake-separating remote control instruction; if the switch operation mode is a section switch, andj＜yedge nodekJudging terminaljTerminal, and recording mediumj+1The remote switch is opened; when in usej=yWhen the fault is located at the edge nodekAnd edge nodek+1Between, edge nodekJudging terminalyThe remote control switch is opened, and meanwhile, the edge node k +1 is used for judging the remote control opening of the internal radical switch of the node;
s44, the controlled terminal returns the switch position division remote signaling state quantity to the subordinate edge node, and if the edge node successfully receives the switch remote signaling position division return value, information is fed back to the edge node to which the line contact switch belongs through 5G network communicationi(ii) a If the edge node does not receive the switch remote signaling separating return value, the fault research and judgment is started to remotely separate the upstream and downstream switches connected with the controlled terminal in the station, and the action information is fed back to the edge nodei；
S45, edge nodeiAnd acquiring switch fault information and a topology model in the station, and if no fault information is uploaded from terminals at upstream and downstream switches connected with the interconnection switch, closing the interconnection switch by remote control, and finishing the algorithm.
The self-healing feeder automation control method based on the 5G edge nodes has the advantages that a feeder automation processing mode with flexible control strategies is designed, automatic check of line switch topology can be achieved, centralized automation and intelligent distributed automation control strategies are compatible, deep fusion of protection and automation logic is achieved, and fault power outage minimization is achieved on the premise that rapid fault removal is guaranteed. The GOOSE forwarding mechanism is realized through the 5G wide area network based on the edge node design, the problems of poor data interaction real-time performance, difficult matching of protection constant value grade difference, low application scene adaptability and the like of the distribution line can be effectively solved, and the application requirements of feeder automation functions under various grid structure of the distribution network are met.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention.
Fig. 2 is a schematic diagram of a power distribution network architecture and a fault point location according to an embodiment of the present invention.
Detailed Description
The invention is elucidated in further detail below with reference to the drawing.
As shown in fig. 1, the self-healing feeder automation control method based on 5G edge nodes provided by the present invention includes the following steps:
s1, deploying discrete measurement and control terminals in a station on a 10kV distribution network line to acquire telemetering analog quantity information and telemetering digital quantity information, configuring protection, measurement and switch operation functions, and sharing digital electrical information to an edge node of the station through IEC61850+ GOOSE among the discrete measurement and control terminals;
in this embodiment, the discrete measurement and control terminal in station is installed in 10kV distribution network cable line ring main unit and switching station, 10kV distribution network overhead line column switch, and each terminal is configured with a group of three-phase protection CT and two groups of measurement PT, so as to realize fast and automatic clearing and isolating of inter-phase short-circuit fault and single-phase earth fault in user interface, and ensure the power safety of line and non-fault users.
In this embodiment, the edge node integrates an embedded ARM/DSP processor, a high-speed backplane connection, an industrial ethernet switch, a high-speed high-precision synchronous sampling, and an IEEE1588 network clock synchronization hardware technology to form an embedded communication and data processing platform based on a hierarchical distributed ethernet structure design; the platform is used as a communication gateway for power distribution network control, measurement and relay protection, and functions of communication protocol conversion, data processing and graphic display between discrete measurement and control terminals are achieved.
S2, constructing a network node topology model for representing the connection relation between the discrete measurement and control terminal and the subordinate edge nodes and the subscription relation between the edge nodes in the 10kV distribution network line, and performing model verification by adopting a topology recognition algorithm based on an edge calculation model, wherein the model verification comprises edge node internal terminal connection relation verification and edge node subscription relation verification;
in this embodiment, the following steps are specifically adopted for verifying the connection relationship of the internal terminal of the edge node;
A. computingt 1 The time terminal number iskAnd
node voltage value ofU k AndU m ：
in the formulaU k Is composed oft 1 The time number iskThe voltage value is telemetered to the terminal in the node,U m is composed oft 1 The time number ismThe voltage value is telemetered to the terminal in the node,U 10 is composed oft 1 The 10kV system bus voltage value of the distribution line at the moment,I k is composed oft 1 The time number iskThe current value is telemetered to the intra-node terminal of (1),I m is composed oft 1 The time number ismThe current value is telemetered to the intra-node terminal of (1),R k is numbered askThe equivalent impedance value of the line at the switch position to which the terminal belongs in the node of (1),R m is numbered asmThe equivalent impedance value of the line at the switch position of the terminal in the node;
B. calculating the remote measurement trigger by taking the time of the remote measurement change value sent by the discrete measurement and control terminal in the station as a referencet 2 The time terminal number iskAnd
node voltage value of
And
：
in the formula
Is composed oft 2 The time number iskThe voltage value is telemetered to the intra-node terminal of (1),
is composed oft 2 The time number ismThe voltage value is telemetered to the terminal in the node,U 20 is composed oft 2 The 10kV system bus voltage value of the distribution line at the moment,
is composed oft 2 The time number iskThe intra-node terminals of (a) telemetry current values,
is composed oft 2 The time number ismThe intra-node terminal of (1) telemeters a current value;
C. will be provided witht 1 、t 2 The time number iskAndmcomparing the remote measurement voltage values of the discrete measurement and control terminals in the station, and calculating the voltage difference value at each terminal position
And
：
D. comparative analysis
And
calculating the difference between the two
When it is satisfied
And is provided with
Or is or
And is
Time, terminalkThe associated line switch being located at the terminalmThe upper reaches of the circuit switch, otherwise, the lower reaches;
E. and D, repeating the steps A to D until the connection relation of all terminals in the edge node is checked, and stopping the algorithm.
In this embodiment, the checking of the subscription relationship between the edge nodes is performed by defining an edge node incidence matrixKDimension equal to the number of edge nodes, and therefore for allxA 10kV system network with edge nodes, and the following conditional equation is adopted to define the elements in the matrixk ij ：
Computing an evaluation matrix
When it is satisfied
And when the conditions are met, the connection subscription relationship among all edge nodes in the system is met, and the verification of the network node topology model is finished.
S3, sharing information by the edge node and the 5G communication device, acting network communication between all the interval units in the station which belongs to the edge node and the external edge node, and transmitting the digital electrical information in the station obtained in the step S1 to the external edge node which meets the subscription relationship through the 5G network communication to realize peer-to-peer communication between the stations;
s4, protecting measurement and control information of switches and external nodes in the edge node collection station, combining the network node topology model obtained in the step S2, performing fault accurate positioning, quick isolation and self-healing recovery power supply by adopting a self-healing type feeder automation intelligent studying and judging algorithm, and specifically studying and judging by adopting the following steps:
s41, collecting over-current, under-voltage and zero sequence alarm fault information of a measurement and control terminal in the collection station by the edge node, carrying out peer-to-peer communication with the external edge node meeting the subscription relation in the 10kV distribution network line, and if the 10kV distribution network line is sharednConstructing 1 x from each edge nodenOrder failure node matrix, secondiThe fault information collected by each edge node isf i The values are:
when the following conditions are satisfied:
s42, aiming at the edge node, adopting the network node topology model of the step S2kThe measurement and control terminal is used for accurately positioning the fault position: suppose an edge nodekIs shared byyThe terminal, the direction from the power supply point of the line to the interconnection switch is defined as the positive direction, the serial numbers of the superior and inferior relations of each terminal are determined through the check of the connection relation of the internal terminals of the edge nodes, when the first terminal is in the first orderjWhile the terminal receives the fault informationj+1The fault information of the terminal is sent up, namely the fault can be positioned on the second placejSwitch and the second switch to which the terminal belongsj+1The switch to which each terminal belongs;
s43, judging edge nodeskTo get it atjRemote signaling number of individual terminalMeasuring information, searching switch attribute, if the switch operation mode is branch switch, edge nodekJudging terminaljSending a brake-separating remote control instruction; if the switch operation mode is a section switch, andj＜yedge nodekJudging terminaljTerminal, terminal and method for controlling the samej+1The remote switch is opened; when in usej=yWhen the fault is located at the edge nodekAnd edge nodek+1Between, edge nodekJudging terminalyThe remote control switch is opened, and meanwhile, the edge node k +1 is used for judging the remote control opening of the internal radical switch of the node;
s44, the controlled terminal returns the switch position division remote signaling state quantity to the subordinate edge node, and if the edge node successfully receives the switch remote signaling position division return value, information is fed back to the edge node to which the line contact switch belongs through 5G network communicationi(ii) a If the edge node does not receive the switch remote signaling separating return value, the fault research and judgment is started to remotely separate the upstream and downstream switches connected with the controlled terminal in the station, and the action information is fed back to the edge nodei；
S45, edge nodeiAnd acquiring switch fault information and a topology model in the station, if no fault information is uploaded at the terminals of the upstream and downstream switches connected with the interconnection switch, closing the interconnection switch by remote control, and ending the algorithm.
And S5, after the feeder automation fault processing is finished, repeating the steps S1-S4 to finish the self-healing processing of the line fault of the next power distribution area.
The invention will be further explained by taking an example of self-healing feeder automation fault handling based on 5G edge nodes as an example with reference to the accompanying drawings.
As shown in fig. 2, the grid of the power distribution system in this embodiment includes 20 switch partition units, including 3 power supply points, 3 substation outgoing switches, 2 line pole-mounted switches, and 5 ring main units. Constructing 5 edge nodes by adopting the steps S1-S2, wherein the edge node 1 in-station switch comprises 901, F01, F02 and M01; the edge node 2 in-station switch comprises F03, F04, F05, F06 and M02; the edge node 3 in-station switch comprises 902, F07 and M03; the edge node 4 in-station switches include 903, F08, F09, F10, F11, F12, M04, M05.
In this embodiment, the fault of K1, the fault information collected by the edge nodes 2 and 3, and the step S41 are combined to study and judge that the fault area is located at the edge node 2, and then the step S42 to S43 are used to study and judge the fault information uploading condition of each switch position terminal at the edge node 2, so as to conclude that the fault is located at the rear side of the F03 switch, and control the F03 switch to open the switch, and since the fault information is not more than the condition for switching the switch in the step S45, the fault processing is finished.
In the embodiment, a fault of the K2, fault information collected by the edge node 4, is investigated and judged that the fault area is located at the edge node 4 in combination with the step S41, and then the fault information uploading condition of each switch position terminal at the edge node 4 is investigated and judged through the steps S42 to S43, so that the result is that the fault is located between the switches F09 and F10, and the switches F09 and F10 are controlled to be switched off; because the terminal communication at the F10 switch is abnormal, the edge node 4 does not receive the switch remote signaling state quantity return value, and the F11 and M05 switches are judged to be opened through S44; the M03 interconnection switch is successfully supplied, and the fault isolation and self-healing process is finished.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. A self-healing feeder automation control method based on 5G edge nodes is characterized by comprising the following steps: the method comprises the following steps:
s1, deploying discrete measurement and control terminals in a station on a 10kV distribution network line to acquire telemetering analog quantity information and telemetering digital quantity information, configuring protection, measurement and switch operation functions, and sharing digital electrical information to edge nodes of the station through IEC61850+ GOOSE among the discrete measurement and control terminals;
s2, constructing a network node topology model for representing the connection relation between the discrete measurement and control terminal and the subordinate edge nodes and the subscription relation between the edge nodes in the 10kV distribution network line, and performing model verification by adopting a topology recognition algorithm based on an edge calculation model;
s3, sharing information between the edge nodes and the 5G communication device, acting network communication between all the interval units in the station which belongs to the edge nodes and the external edge nodes, and transmitting the digital electrical information in the station obtained in the step S1 to the external edge nodes meeting the subscription relationship through the 5G network communication to realize inter-station peer-to-peer communication;
and S4, protecting measurement and control information of the switch and the external node in the station by the edge node, and performing fault positioning, isolation and self-healing recovery power supply by adopting a self-healing type feeder automation intelligent studying and judging algorithm by combining the network node topology model obtained in the step S2.
2. The self-healing feeder automation control method based on 5G edge nodes according to claim 1, characterized in that: also comprises the following steps:
and S5, after the feeder automation fault processing is finished, repeating the steps S1-S4 to finish the self-healing processing of the line fault of the next power distribution area.
3. The self-healing feeder automation control method based on 5G edge nodes according to claim 1 or 2, characterized in that,
the in-station discrete measurement and control terminal is arranged at a 10kV distribution network cable line ring main unit, a switching station and a column upper switch of a 10kV distribution network overhead line, and each terminal is provided with a group of three-phase protection CT and two groups of measurement PT, so that the inter-phase short-circuit fault and the single-phase grounding fault in an isolation user interface can be automatically removed, and the power utilization safety of a line and a non-fault user can be ensured;
and S1, the edge node of the station fuses an embedded ARM/DSP processor, high-speed backboard connection, an industrial Ethernet switch, high-speed high-precision synchronous sampling and IEEE1588 network clock synchronous hardware technology to form an embedded communication and data processing platform based on a hierarchical distributed Ethernet structure design.
4. The self-healing feeder automation control method based on 5G edge nodes according to claim 3, characterized in that: the embedded communication and data processing platform is used as a communication gateway for power distribution network control, measurement and relay protection, and functions of communication protocol conversion, data processing and graphic display among discrete measurement and control terminals are achieved.
5. The self-healing feeder automation control method based on 5G edge nodes according to claim 1 or 2, characterized in that: and S2, the topology identification algorithm based on the edge calculation model is used for describing a distribution line network topology structure and realizing topology verification of upstream and downstream switches of the line, and the topology identification algorithm comprises edge node internal terminal connection relation verification and edge node subscription relation verification.
6. The self-healing feeder automation control method based on 5G edge nodes according to claim 5, characterized in that: the connection relation of the internal terminals of the edge nodes is verified, the collected telemetering analog quantity information uploaded by the edge nodes by discrete measurement and control terminals in a station is used as a reference, the peak difference of the telemetering analog quantity of each terminal in an adjacent time period is used as a basis, the upstream and downstream position relation of a 10kV line switch where each terminal is located is calculated and judged, and the calculation is specifically carried out by adopting the following steps:
A. computingt 1 The time terminal number iskAndmnode voltage value ofU k AndU m ：
in the formula: U k is composed oft 1 The time number iskThe voltage value is telemetered to the intra-node terminal of (1),U m is composed oft 1 The time number ismThe voltage value is telemetered to the intra-node terminal of (1),U 10 is composed oft 1 The 10kV system bus voltage value of the distribution line at any moment,I k is composed oft 1 The time number iskThe intra-node terminals of (a) telemetry current values,I m is composed oft 1 The time number ismThe current value is telemetered to the intra-node terminal of (1),R k is numbered askAt the switch position of the terminal in the nodeThe equivalent impedance value of the line is obtained,R m is numbered asmThe equivalent impedance value of the line at the switch position to which the terminal belongs in the node of (1),
；
B. calculating the telemetering trigger by taking the time of the telemetering change value uploaded by the discrete measurement and control terminal as the referencet 2 Time terminal number iskAndmnode voltage value of
And
：
in the formula
Is composed oft 2 The time number iskThe voltage value is telemetered to the intra-node terminal of (1),
is composed oft 2 The time number ismThe voltage value is telemetered to the terminal in the node,U 20 is composed oft 2 The 10kV system bus voltage value of the distribution line at any moment,
is composed oft 2 The time number iskThe intra-node terminals of (a) telemetry current values,
is composed oft 2 The time number ismNode ofThe current value is telemetered to the end,
；
C. will be provided witht 1 、t 2 The time number iskAndmcomparing the remote-measuring voltage values of the terminals, and calculating the voltage difference value of the discrete measurement and control terminal position in each station
And
：
D. comparative analysis
And
calculating the difference between the two
When it is satisfied
And is
Or is a
And is
Time, terminalkTo which it belongsThe line switch being located at the terminalmThe upstream of the circuit switch is the other way, and the downstream is the other way;
E. and D, repeating the steps A to D until the connection relation of all terminals in the edge node is checked, and stopping the algorithm.
7. The self-healing feeder automation control method based on 5G edge nodes according to claim 5, characterized in that: the subscription relation among the edge nodes is checked by defining an edge node incidence matrixKIts dimension is equal to the number of edge nodes, so for the node containingxA 10kV system network with edge nodes, and the following conditional equation is adopted to define the elements in the matrixk ij ：
Computing an evaluation matrix
When it is satisfied
And when the conditions are met, the connection subscription relationship among all edge nodes in the system is met, and the verification of the network node topology model is finished.
8. The self-healing feeder automation control method based on 5G edge nodes according to claim 1 or 2, characterized in that: s4, the self-healing feeder automation intelligent studying and judging algorithm collects fault information through edge nodes and combines inter-station peer-to-peer communication to realize second-level fault self-healing, and concretely adopts the following steps to study and judge:
s41, collecting over-current, under-voltage and zero sequence alarm fault information of a measurement and control terminal in the collection station by the edge node, carrying out peer-to-peer communication with the external edge node meeting the subscription relation in the 10kV distribution network line, and if the 10kV distribution network line is sharednEdge nodes, construct 1nOrder of faulty node matrix, firstiAn edge nodeThe collected fault information isf i The values are:
when the condition is satisfied:
s42, aiming at the edge node, adopting the network node topology model of the step S2kThe measurement and control terminal is used for accurately positioning the fault position: if the edge nodekIs shared byyEach terminal, the direction from the line power supply point to the interconnection switch is defined as the positive direction, and the superior and inferior relation serial numbers of each terminal are determined to be sequentially
When it comes tojWhile the terminal receives the fault informationj+1The terminal has no fault information to be sent, namely the fault can be positioned at the second placejSwitch and the second switch to which the terminal belongsj+1The switch to which each terminal belongs;
s43, judging edge nodeskTo get it atjRemote signaling digital quantity information of each terminal, searching switch attribute, and if the switch operation mode is branch switch, edge nodekJudging terminaljSending a brake-separating remote control instruction; if the switch operation mode is a section switch, andj＜yedge nodekJudging terminaljTerminal, terminal and method for controlling the samej+1The remote switch is opened; when in usej=yWhen the fault is located at the edge nodekAnd edge nodek+1Between, edge nodekJudging terminalyRemotely controlling the switch to be switched off, and simultaneously judging the remote control switching-off of the internal radical switch of the node by the edge node k + 1;
s44, the controlled terminal returns the switch position division remote signaling state quantity to the subordinate edge node, and if the edge node successfully receives the switch remote signaling position division return valueThe information is fed back to the edge node to which the line contact switch belongs through the 5G network communicationi(ii) a If the edge node does not receive the switch remote signaling separating return value, the fault research and judgment is started to remotely separate the upstream and downstream switches connected with the controlled terminal in the station, and the action information is fed back to the edge nodei；
S45, edge nodeiAnd acquiring switch fault information and a topology model in the station, if no fault information is uploaded at the terminals of the upstream and downstream switches connected with the interconnection switch, closing the interconnection switch by remote control, and ending the algorithm.
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