CN113194432A - Network communication method between intelligent distributed feeder automation terminals - Google Patents
Network communication method between intelligent distributed feeder automation terminals Download PDFInfo
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- CN113194432A CN113194432A CN202110475513.8A CN202110475513A CN113194432A CN 113194432 A CN113194432 A CN 113194432A CN 202110475513 A CN202110475513 A CN 202110475513A CN 113194432 A CN113194432 A CN 113194432A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
- H04W40/248—Connectivity information update
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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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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Abstract
A network communication method between intelligent distributed feeder automation terminals is characterized in that network functions and parameters are arranged through a 5G slice network design interface, and a uRLLC slice meeting the power service requirements of the intelligent distributed feeder automation terminals is designed; the 5G slice network is used as a communication channel, a data link is optimized through the 5G slice network so as to minimize the link transmission hop number, and the addition and the departure of the dynamic group model are completed through IGMP protocol messages of the power terminal equipment group and the distributed feeder automation terminal; and when the static group model of the power terminal equipment group changes, the core network control plane generates a group member forwarding strategy based on the group member information and issues the group member forwarding strategy to the user plane function UPF, and the user plane function UPF forwards the multicast message in the group based on the group member forwarding strategy by using the 5G slice network as a communication channel. The invention realizes real-time transmission, analysis, on-site processing and application of mass data, and can realize rapid processing of distribution network faults.
Description
Technical Field
The invention relates to the field of power systems and automation thereof, in particular to a network communication method between intelligent distributed feeder automation terminals based on 5G.
Background
At present, the electric power communication facilities comprise an electric power communication network consisting of communication equipment, overhead lines, ground access optical fibers and other equipment facilities, and the electric power communication network is distributed inside and outside a station house and is overhead in the ground, so that a high-bandwidth and low-delay communication network based on an intelligent video image recognition monitoring technology is needed. The mobile, broadband and low-delay applications of equipment such as unmanned aerial vehicle line patrol, mobile intelligent wearable multimedia interactive patrol and the like which are possibly implemented in the future also provide communication network requirements of high bandwidth, low delay and large capacity for the communication network.
The 5G technology provides a network platform for transmitting video image multimedia information with high bandwidth and low time delay and accessing a high-capacity sensing terminal for communication operation and maintenance. At present, a great number of different communication protocols exist in power communication, and how to protect the investment of the past communication terminals in the 5G era is a very important topic for accessing the traditional power-related communication terminal equipment to the 5G communication service. The distributed FA (feeder automation) acts on fault location, isolation and recovery through coordination and coordination of adjacent terminals, and this way can realize rapid isolation and self-healing of faults, and the following problems exist in the current intelligent distributed FA application in the 5G era: (1) the intelligent distributed FA has poor interaction capacity with the power terminal equipment group: in the application process of the current intelligent distributed FA, the problems of information interaction and mutual matching between the intelligent distributed FA and the power terminal equipment group are not properly solved, and the intelligent distributed FA and the centralized FA of the power distribution automation master station operate independently and lack of unified coordination capability; (2) the communication transmission capacity of the power grid control service is not large, but the requirements on real-time performance and reliability are very high, such as power distribution protection, accurate load control, distributed power supply regulation and control, the requirements on the synchronism and reliability of data transmission are high, the end-to-end delay is less than 10ms, the reliability of data communication needs to reach 99.99%, the requirements of intelligent distributed FA under the existing 4G communication condition are difficult to meet, and if optical fibers are radiated, the problems of high cost, large reconstruction engineering quantity and the like exist.
Disclosure of Invention
The invention aims to provide a network communication method between intelligent distributed feeder automation terminals, which realizes real-time transmission, analysis, on-site processing and application of mass data and can realize rapid processing of distribution network faults.
In order to achieve the above object, the present invention provides a network communication method between intelligent distributed feeder automation terminals, comprising the following steps:
defining a static group model and a dynamic group model of the power terminal equipment group as a model foundation of distribution line topology self-adaption;
arranging network functions and parameters through a 5G slice network design interface, and designing a uRLLC slice meeting the power service requirement of an intelligent distributed feeder automation terminal;
the 5G slice network is used as a communication channel, a data link is optimized through the 5G slice network so as to minimize the link transmission hop number, and the addition and the departure of the dynamic group model are completed through IGMP protocol messages of the power terminal equipment group and the distributed feeder automation terminal;
and when the static group model of the power terminal equipment group changes, the core network control plane generates a group member forwarding strategy based on the group member information and issues the group member forwarding strategy to the user plane function UPF, and the user plane function UPF forwards the multicast message in the group based on the group member forwarding strategy by using the 5G slice network as a communication channel.
The static group model of the power terminal equipment group is stored in the power management system, and the group members of the power terminal equipment group are led into the core network control surface by the power management system; the static group model describes that a line has directly electrically connected neighboring nodes; the dynamic group model is added with the change information of the node power supply point, the power supply path and the corresponding contact switch on the basis of the static group model.
The power service requirements of the intelligent distributed feeder automation terminal at least comprise: capacity, delay, bandwidth, security level, reliability level.
The 5G slice network is used as a communication channel to realize ultra-low time delay at the RAN side of the 5G radio access network through shortenedTTI or fast HARQ;
the 5G slice network is used as a communication channel at the TN side of the 5G power supply, the queuing time delay is reduced by optimizing the queuing technology of packet switching, and a deterministic time delay pipeline is realized by a flexible Ethernet bottom layer crossing technology;
and 5G slice networks are used as communication channels on the 5GCN side, and the time delay is reduced by an on-demand scheduling technology.
The user plane function UPF adopts a distributed local deployment mode, and reduces network processing time delay.
The method for forwarding the multicast message comprises the following steps: the power terminal equipment group sends the GOOSE message upwards in a UDP multicast mode, and the 5G communication terminal supports multicast message identification and forwarding, so that the message can be packaged to a corresponding bearer.
When the distribution line has a fault, the intelligent distributed feeder automation terminal enters a fault identification and fault isolation program, and the distribution line topology is updated according to a self-adaptive algorithm of distribution line topology change caused by fault isolation.
Compared with the prior art, the invention has the following remarkable beneficial effects:
1. the intelligent integration system is matched with a 5G technology distribution area intelligent integration terminal, low-voltage Internet of things equipment is used as a perception, a power distribution and utilization unified model and an Internet of things standard protocol are applied, real-time transmission, analysis, on-site processing and application of mass data are achieved, distribution network faults are rapidly processed, accordingly, flexible access and ordered management and control of charging piles and distributed energy resources are achieved, functions of plug-and-play, topology transaction analysis and the like of the distribution network low-voltage equipment are achieved, lean management and high-quality power supply service of a distribution network are supported in an all-round mode, and distributed clean energy consumption and power supply reliability are guaranteed.
2. The invention can realize that the sensing equipment comprehensively collects the environmental quantity, the physical quantity, the state quantity and the electrical quantity of the power terminal equipment group based on the 5G technology, realizes comprehensive sensing of the state of the power transformation equipment, comprehensive monitoring of main and auxiliary equipment, combined inspection of video and robots and the like, synchronizes the comprehensive management platform of the transformer substation in real time, and realizes the functions of one-key sequential control of switching operation, automatic inspection of equipment in the substation, intelligent management and control of personnel behaviors, intelligent linkage of the main and auxiliary equipment, active early warning of equipment abnormity, intelligent decision of fault tripping and the like.
3. According to the invention, 5G is adopted as an access mode, and the operation topology can be rapidly updated under the condition that the connection relation of the distribution line is changed or the line topology is changed due to fault isolation and power restoration in a non-fault area through a topology model interaction mechanism between the master station system and the power terminal equipment group.
Drawings
Fig. 1 is a schematic diagram of a network communication method between intelligent distributed feeder automation terminals according to the present invention.
Fig. 2 is a schematic diagram of a distribution flow of multicast packets.
Figure 3 is a flow chart of an adaptive algorithm for fault isolation causing a change in distribution line topology.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 1 to 3.
The invention provides a network communication method between intelligent distributed feeder automation terminals, which comprises the following steps:
step 1, defining a static group model and a dynamic group model of an electric power terminal equipment group as a distribution line topology self-adaptive model foundation;
group members of the power terminal equipment group are led into a core network control Plane by a power management system, the core network control Plane generates a group member forwarding strategy based on the led-in information and sends the group member forwarding strategy to a User Plane Function (UPF), and the UPF distributes multicast messages in the group based on the group member forwarding strategy;
the static group model of the power terminal equipment group is stored in the power management system, the static group model can describe adjacent nodes of a circuit with direct electrical connection, and the dynamic group model of the power terminal equipment group is added with the change information of a node power supply point, a power supply path and a corresponding contact switch on the basis of the static group model;
step 2, arranging network functions and parameters through a 5G slice network design interface, and designing Ultra reliable and low latency services (ULRLLC slices) meeting the power service requirements;
the arrangement of the network functions and parameters is to design uRLLC slices meeting the power service requirements according to the service requirements of an intelligent distributed feeder automation terminal, wherein a core network can provide micro-service-level arrangement capacity, an access network can select and cut functions of an L1 physical layer, an L2 protocol layer and an L3RRC layer, and a transmission network can select transmission resources, paths and the like according to the requirements of time delay and isolation;
the power service requirements of the intelligent distributed feeder automation terminal include but are not limited to capacity, time delay, bandwidth, security level and reliability level;
step 3, using a 5G slice network as a communication channel, optimizing a data link through the slice network on the basis of the low-delay characteristic of 5G communication to minimize the link transmission hop count (the number of routers from a source end to a destination end), completing the addition and the departure of a dynamic group model through IGMP Join/Leave messages of a power terminal equipment group and a distributed feeder automation terminal, and supporting IGMPproxy on a core network side;
the Internet Group Management Protocol is called IGMP (Internet Group Management Protocol) and is a multicast Protocol in the Internet Protocol family. The protocol runs between the host and the multicast router. The IGMP protocol has three versions, IGMPv1, v2, and v 3.
IGMPv1 message
IGMP messages are encapsulated in IP messages, and IGMPv1 messages have two types:
general group Query message (General Query): the inquirer sends inquiry messages to all hosts and routers on the shared network, and is used for knowing which multicast groups have members.
Member Report message (Report): the report message sent by the host to the multicast router is used for applying for joining a certain multicast group or responding to the query message.
IGMPv1 working mechanism
The IGMPv1 protocol accomplishes multicast group management mainly based on a query and response mechanism. When there are multiple multicast routers in a network segment, it is enough to only need one of them to send the query message, and at this time, an IGMP querier needs to be elected. In IGMPv1, a unique multicast information forwarder (Assert Winner or DR) is elected by the multicast routing protocol PIM as an inquirer of IGMPv1, which is responsible for group membership inquiry of the network segment.
IGMPv2 message
Compared with the IGMPv1, in addition to the general group query message and the member report message, two new messages are added to IGMPv 2:
Group-Specific Query message (Group-Specific Query): the inquiring device sends an inquiring message to a specified multicast group in the shared network segment for inquiring whether the multicast group has members.
Member Leave message (Leave): when leaving the multicast group, the member actively sends a message to the router to announce that the member leaves a certain multicast group.
IGMPv2 also improves on the generic group query message format, adding a maximum Response Time (Max Response Time) field. The value of the field can be configured for controlling the response speed of the member.
IGMPv2 working mechanism
On the work mechanism, IGMPv2 adds a querier election and group leaving mechanism compared to IGMPv 1.
Changes in IGMPv3
The IGMPv3 is developed to match with the SSM (Source-Specific Multicast) model, and provides the capability of carrying Multicast Source information in the packet, i.e. adding to the Multicast group of the specified Source.
IGMPv3 message
The IGMPv3 message contains two broad categories: query messages and report messages. Compared with IGMPv2, the changes are as follows:
besides general Group Query and Specific Group Query, a Specific Source Group Query (Group-and-Source-Specific Query) is added in the Query message. The message is sent to a specific multicast group member in the shared network segment by the inquirer, and is used for inquiring whether the group member is willing to receive data sent by a specific source. A specific source group query achieves this by carrying one or more multicast source addresses in the message.
The report message not only informs the router host that it is to join a multicast group, but also may specify which multicast sources are to receive data intended for the group only. The IGMPv3 adds a filtering mode (INCLUDE/extract) for the multicast source, and simply represents the correspondence between the multicast group and the source list as (G, INCLUDE, (S1, S2.)) to indicate that only data from the specified multicast sources S1, S2 … … to the group G is received; or (G, extract, (S1, S2.)) indicating that data addressed to group G by a multicast source other than the multicast sources S1, S2 … … is received, i.e., S1, S2 … … are out of reception range.
In IGMPv3, one member report message can carry information of multiple multicast groups, while one member report of previous version can only carry one multicast group. This greatly reduces the number of messages in IGMPv 3.
IGMPv3 does not define a special member leave message, which is conveyed by a specific type of report message.
IGMPv3 working mechanism
On the working mechanism, IGMPv3 increases the host's ability to select a multicast source compared to IGMPv 2.
IGMP Proxy builds multicast list by intercepting IGMP message between user and router, the up-connection port of Proxy executes host role, and the down-connection port executes router role.
The 5G slice network is used as a communication channel to realize ultra-low delay on a 5GRAN (5G radio access network) side through technologies including but not limited to short TTI and fast HARQ.
Using a 5G slice network as a communication channel to reduce queuing delay through queuing techniques including, but not limited to, optimized packet switching, and implementing deterministic delay pipes through techniques including, but not limited to, flexible ethernet bottom layer (1.5 layer) interleaving, on the 5GTN (5G power) side;
latency is reduced on the 5GCN side by using a 5G slice network as a communication channel through techniques including, but not limited to, on-demand scheduling.
Step 4, using a 5G slice network as a communication channel, when a static group model of the power terminal equipment group changes, generating a group member forwarding strategy by a core network control surface based on group member information, and issuing the group member forwarding strategy to a UPF (unified power flow function), wherein the UPF forwards the multicast message in the group based on the group member forwarding strategy, and reduces network processing delay through a distributed local deployment mode of the UPF;
the specific mode for forwarding the multicast message is as follows: the power terminal equipment group sends the GOOSE message (the transformer substation event of a general object) upwards in a UDP multicast mode, and the 5G communication terminal supports multicast message identification and forwarding, so that the message can be packaged to a corresponding bearer;
and 6, when the distribution line has a fault, the intelligent distributed feeder automation terminal enters a fault identification and fault isolation program, and the distribution line topology is updated according to a self-adaptive algorithm of distribution line topology change caused by fault isolation.
In step 6, the adaptive algorithm for topology change of the distribution line caused by fault isolation specifically includes: when a distribution line has a fault, the intelligent distributed feeder automation Terminal firstly identifies the fault, eliminates a non-fault section, judges a specific fault section, then enters a fault isolation program, and sends a tripping command to a fault point corresponding to an STU (Secure Terminal Unit) to effectively isolate the fault; if the switch fails to operate or the intelligent distributed feeder automation terminal has a positioning error and the fault sensing current still exists, starting a fault isolation program by the power terminal equipment group, fully playing the accuracy of the information of the power terminal equipment group and isolating the fault in a minimum interval; and after the fault isolation is finished, the power terminal equipment group updates the area topology and issues the topology operation model.
In one embodiment, the network communication between the intelligent distributed feeder automation terminals based on 5G of the present invention is shown in fig. 1, and the core idea is to implement quick interaction of information by decentralization based on message (multicast) forwarding between terminal devices, so as to perform fault diagnosis and isolation, and the specific steps are as follows:
(1) in order to provide a means and a method for automatically updating a line topology model installed in an electric terminal equipment group, a model expression form of a distribution line topology based on a 5G slicing technology between an STU system and the electric terminal equipment group is defined, messages sent between an STU < - > STU terminal are multicast by using a GOOSE OVER UDP/IP protocol, the priority is highest, the messages are most sensitive to time delay (millisecond level), the messages can be divided into heartbeat messages and state multicast messages triggered by faults, the priority of the state multicast messages is highest, and once triggered, the heartbeat messages are stopped being sent. The messages sent between the STU control centers (the main station/the sub-station) adopt a standard TCP/IP protocol, the priority is second, the messages are insensitive to time delay (communication time delay second level), the messages can be divided into general (remote signaling and remote sensing) and remote control (artificial command issuing) messages, and the priority of the messages is higher. The power distribution terminal stores an SCL (service level model) file based on XML (extensive markup language) grammar to represent the connection relation of the monitored primary equipment pair, wherein a static group model is stored in the power management system and can describe adjacent nodes of a line with direct electrical connection, and a dynamic group model of the power terminal equipment group is added with the change information of a node power supply point, a power supply path and a corresponding contact switch on the basis of the static model;
(2) according to the service requirements of the intelligent distributed FA based on the 5G, including capacity, time delay, bandwidth, security level, reliability level and the like, network functions and parameters are flexibly arranged through a 5G network slice design interface, and a uRLLC slice meeting the power service requirements is designed. The core network can provide the micro-service level arranging ability, the access network can select and cut the functions of the L1 physical layer, the L2 protocol layer and the L3RRC layer, and the transmission network can select transmission resources and paths according to the requirements of time delay and isolation.
(3) The method comprises the steps that a 5G slice network is used as a communication channel, on the basis of the low-delay characteristic of 5G communication, a data link is optimized through the slice network to minimize the hop count of link transmission, the addition and the departure of a dynamic group model are completed through IGMP Join/Leave messages of a power terminal and a distributed FA, and an IGMP Proxy is supported by a core network side;
(4) utilize 5G section network as communication channel, when the static group model of electric power terminal equipment group changes, the control plane of core network generates the group member based on group member information and forwards the strategy, issues UPF, and UPF forwards the strategy with the group report in the group based on the member in the group, through UPF's distributed local deployment mode, reduces network processing time delay, and concrete mode is: the power terminal sends the GOOSE message upwards in a UDP multicast mode, as shown in fig. 2, since the 5G communication terminal supports multicast message identification and forwarding, the message can be encapsulated to a corresponding bearer;
(5) when the distribution line has a fault, the intelligent distributed FA enters a fault identification and fault isolation program, and completes the updating of the distribution line topology according to the adaptive algorithm of the distribution line topology change caused by the fault isolation, wherein the adaptive algorithm of the distribution line topology change caused by the fault isolation is shown in FIG. 3: when a distribution line has a fault, the intelligent distributed FA firstly identifies the fault, eliminates a non-fault section, judges a fault specific section, then enters a fault isolation program, and sends a tripping command to a fault point corresponding to the STU to effectively isolate the fault; if the switch fails to operate or the intelligent distributed FA has a positioning error and the fault sensing current still exists, the power terminal equipment group starts a fault isolation program, the accuracy of the information of the power terminal equipment group is fully exerted, and the fault is isolated in a minimum interval; and after the fault isolation is finished, the power terminal equipment group updates the area topology and issues the topology operation model.
1. The intelligent integration system is matched with a 5G technology distribution area intelligent integration terminal, low-voltage Internet of things equipment is used as a perception, a power distribution and utilization unified model and an Internet of things standard protocol are applied, real-time transmission, analysis, on-site processing and application of mass data are achieved, distribution network faults are rapidly processed, accordingly, flexible access and ordered management and control of charging piles and distributed energy resources are achieved, functions of plug-and-play, topology transaction analysis and the like of the distribution network low-voltage equipment are achieved, lean management and high-quality power supply service of a distribution network are supported in an all-round mode, and distributed clean energy consumption and power supply reliability are guaranteed.
2. The invention can realize that the sensing equipment comprehensively collects the environmental quantity, the physical quantity, the state quantity and the electrical quantity of the power terminal equipment group based on the 5G technology, realizes comprehensive sensing of the state of the power transformation equipment, comprehensive monitoring of main and auxiliary equipment, combined inspection of video and robots and the like, synchronizes the comprehensive management platform of the transformer substation in real time, and realizes the functions of one-key sequential control of switching operation, automatic inspection of equipment in the substation, intelligent management and control of personnel behaviors, intelligent linkage of the main and auxiliary equipment, active early warning of equipment abnormity, intelligent decision of fault tripping and the like.
3. According to the invention, 5G is adopted as an access mode, and the operation topology can be rapidly updated under the condition that the connection relation of the distribution line is changed or the line topology is changed due to fault isolation and power restoration in a non-fault area through a topology model interaction mechanism between the master station system and the power terminal equipment group.
It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship shown in the drawings, and are only for convenience of describing the embodiments, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (7)
1. A network communication method between intelligent distributed feeder automation terminals is characterized by comprising the following steps:
defining a static group model and a dynamic group model of the power terminal equipment group as a model foundation of distribution line topology self-adaption;
arranging network functions and parameters through a 5G slice network design interface, and designing a uRLLC slice meeting the power service requirement of an intelligent distributed feeder automation terminal;
the 5G slice network is used as a communication channel, a data link is optimized through the 5G slice network so as to minimize the link transmission hop number, and the addition and the departure of the dynamic group model are completed through IGMP protocol messages of the power terminal equipment group and the distributed feeder automation terminal;
and when the static group model of the power terminal equipment group changes, the core network control plane generates a group member forwarding strategy based on the group member information and issues the group member forwarding strategy to the user plane function UPF, and the user plane function UPF forwards the multicast message in the group based on the group member forwarding strategy by using the 5G slice network as a communication channel.
2. The method according to claim 1, wherein a static group model of the power terminal device group is stored in the power management system, and group members of the power terminal device group are imported from the power management system to the core network control plane; the static group model describes that a line has directly electrically connected neighboring nodes; the dynamic group model is added with the change information of the node power supply point, the power supply path and the corresponding contact switch on the basis of the static group model.
3. The method of claim 1, wherein the power service requirements of the intelligent distributed feeder automation terminal comprise at least: capacity, delay, bandwidth, security level, reliability level.
4. The network communication method between intelligent distributed feeder automation terminals as claimed in claim 1, characterized in that a 5G slice network is used as a communication channel to realize ultra-low delay by short TTI or fast HARQ at a 5G radio access network RAN side;
the 5G slice network is used as a communication channel at the TN side of the 5G power supply, the queuing time delay is reduced by optimizing the queuing technology of packet switching, and a deterministic time delay pipeline is realized by a flexible Ethernet bottom layer crossing technology;
and 5G slice networks are used as communication channels on the 5GCN side, and the time delay is reduced by an on-demand scheduling technology.
5. The method according to claim 1, wherein the User Plane Function (UPF) employs a distributed local deployment approach to reduce network processing latency.
6. The method according to claim 1, wherein the method for forwarding multicast packets comprises: the power terminal equipment group sends the GOOSE message upwards in a UDP multicast mode, and the 5G communication terminal supports multicast message identification and forwarding, so that the message can be packaged to a corresponding bearer.
7. The method according to any of claims 1-6, wherein after the distribution line has a fault, the intelligent distributed feeder automation terminal enters a fault identification and isolation procedure, and updates of the distribution line topology are performed according to an adaptive algorithm for topology changes of the distribution line caused by fault isolation.
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