CN113659539A - Distribution network longitudinal differential protection implementation method based on 5G technology - Google Patents
Distribution network longitudinal differential protection implementation method based on 5G technology Download PDFInfo
- Publication number
- CN113659539A CN113659539A CN202110700674.2A CN202110700674A CN113659539A CN 113659539 A CN113659539 A CN 113659539A CN 202110700674 A CN202110700674 A CN 202110700674A CN 113659539 A CN113659539 A CN 113659539A
- Authority
- CN
- China
- Prior art keywords
- protection
- distribution network
- switch
- setting
- constant value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005516 engineering process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 25
- 238000004364 calculation method Methods 0.000 description 23
- 230000006870 function Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 17
- 238000007726 management method Methods 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000013499 data model Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 101100065700 Caenorhabditis elegans etc-1 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000010845 search algorithm Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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]
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
-
- 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
-
- 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
Abstract
The invention discloses a distribution network longitudinal differential protection implementation method based on a 5G technology, which comprises the steps of transferring a self-adaptive set constant value flow to a distribution automation master station, and issuing the flow to a protection device by the master station in a 5G communication mode, so that the protection device can adjust the constant value in real time. The invention establishes a distribution network longitudinal differential protection implementation mechanism based on the 5G technology, establishes a distribution network protection constant value real-time dynamic adjustment mechanism in a wide area range, and makes up for the defect that constant value mismatch is easy to occur when three-section current protection meets a line with a complex structure and frequent operation mode switching, so that the distribution network protection has stronger adaptability to the operation mode and the structure of a power grid.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a distribution network longitudinal differential protection implementation method based on a 5G technology.
Background
The power distribution network is used as the last link of the power transmission and distribution system, and is closely related to a terminal power user, the safe and stable operation of the power distribution network is the guarantee of high quality and high reliable power consumption of the user, so the relay protection of the power distribution network which is used as the first defense line of the safe operation of the power distribution network is very important, and the following problems mainly exist in the aspect of setting calculation of the power distribution network at present:
(1) the power distribution network has huge equipment volume, complex wiring mode, more T wiring paths, large traditional graphic modeling setting workload and incapability of ensuring the accuracy of equipment parameters;
(2) the grid structure of the distribution network system equipment is complex, the operation mode changes frequently, the calculation principle of the current distribution network setting calculation principle is relatively extensive, a necessary checking means is lacked, the adaptability to the grid structure change is poor, and the safety of the fixed value is insufficient;
(3) the existing fixed value setting calculation system device is complex in modeling and cannot be well suitable for distribution network setting calculation, so that distribution network setting calculation work is mostly calculated manually, a fixed value is modified singly, manual intervention is more, the working efficiency is low, and errors are easy to occur;
(4) due to large-scale access of the distributed power supply, the traditional power supply of a single-side power supply is converted into the power supply of a double-end power supply or a multi-end power supply, so that the difficulty of relay protection constant value setting calculation is increased, the adaptability of the protection constant value is not strong, and the reliability level of power supply is reduced;
(5) the fixed value sheets are all papery files, so that the searching is very inconvenient and the unified management is difficult to realize.
In order to solve the problem of the current setting calculation situation of the power distribution network and improve the setting calculation efficiency of the power distribution network, a relay protection distribution network setting calculation system needs to be researched.
The 5GSA network communication guarantee scheme comprises three parts of a core network and a wireless network transmission network. The 5G core network based on the service architecture mainly includes an AMF (mobility management function), an SMF (session management function), and an UPF (user plane function). The gNB (5G wireless base station) designs a new system with a full dynamic structure for adapting to different service requirements, and can realize dynamic frame structure and resource allocation, flexible uplink and downlink time slot switching, various parameter configurations including subcarriers, protection time slots and the like, and various frequency bands and antenna configuration selection. The core network is connected with the wireless base station through the SPN transmission network. The SPN is a new generation of end-to-end layered switching network based on MPLS/SRM, Slicing Ethernet and wave division, and has the transmission network with flexible service scheduling, high reliability, low time delay, high precision clock, easy operation and maintenance, strict service quality guarantee and other attributes.
In order to meet the service index, a private network needs to be configured for the service index through a 5G network slicing technology, and a core network, a transmission network and a wireless network all need to be customized for networking, deploying technical capability and configuring network capability.
(1) In order to meet the requirement of transmission delay, the core network of the operator needs to configure a special UPF for the private network slice, and other network elements can adopt a shared mode. And the UPF sinks as required and approaches to the position of the differential terminal as much as possible to complete the access and forwarding of the traffic nearby. The position of the private network UPF is determined according to the position of the differential terminal. In a city area and under the condition that the distance between two communication ends is relatively short (within 50 km), the system is preferably arranged in a core machine room of an operator, so that core network equipment can be conveniently networked; under the condition that the distance from the downtown is far, but the distance from the two communication ends is close, the mobile convergence and the access machine room deployment with the shortest sum of transmission paths from the two communication ends can be selected according to the networking condition of a transmission ring where the access base station is located.
(2) In order to meet the service bearing requirement with deterministic service quality, the SPN attracts Flex technology, provides an end-to-end transmission pipeline based on a time division link on a forwarding layer, and has the characteristics of low time delay, transparent transmission, hard isolation and the like. The functions of data access, quasi-recovery, addition/deletion of OAM information, cross connection of data streams, monitoring, protection and the like can be realized. The SPN can provide forwarding capability with routing consistency by introducing a connection-oriented SR-TA tunneling technology. Based on the special bearing requirement of the service, a label stack in the head node of the SR tunnel can be manually configured, the node and the link which the tunnel passes through are fixed, and the routing does not change along with the change of the network state, so that the consistency of the data receiving and sending routing is ensured.
Disclosure of Invention
The invention provides a distribution network longitudinal differential protection implementation method based on a 5G technology, which can solve the technical problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
a distribution network longitudinal differential protection implementation method based on a 5G technology comprises the following steps:
and transferring the self-adaptive set constant value flow to a distribution automation master station, and issuing the self-adaptive set constant value flow to a protection device by the master station in a 5G communication mode, so that the protection device can adjust the constant value in real time.
The distribution network longitudinal differential protection implementation method based on the 5G technology establishes a distribution network longitudinal differential protection implementation mechanism based on the 5G technology, establishes a distribution network protection constant value real-time dynamic adjustment mechanism in a wide area range, overcomes the defect that constant value mismatch is easy to occur when three-section type current protection meets a line with a complex structure and frequent operation mode switching, and enables distribution network protection to have stronger adaptability to a power network operation mode and structure.
In summary, the distribution network protection device technology based on 5G is used for researching and establishing a distribution network protection fixed value real-time dynamic adjustment mechanism in a wide area range, providing effective support for distribution network scheduling operation, and improving adaptability of distribution network protection to changes of a power grid operation mode.
Drawings
FIG. 1 is an overall framework diagram of an intelligent distribution network tuning and management system of the present invention;
FIG. 2 is a deployment architecture diagram of the distribution network tuning computation platform of the present invention;
FIG. 3 is a functional architecture diagram of a distribution network tuning computation platform of the present invention;
FIG. 4 is a schematic diagram of a distribution network automation system grid model map file of the present invention;
fig. 5 is a schematic diagram of a distribution network automation power network model data file of the present invention;
FIG. 6 is a schematic diagram of a first-stage switch and a second-stage switch of a 10kV outgoing line;
FIG. 7 is a graph of the operating characteristics of a proportional differential element;
FIG. 8 is a schematic diagram of a ratio differential equation action curve;
FIG. 9 is a logic diagram of interval 1, interval 2 overcurrent I section protection;
FIG. 10 is a logic diagram of protection for the interval 3-8 overcurrent I stage;
FIG. 11 is a zero-sequence overcurrent I-segment protection logic diagram of interval 1 and interval 2;
FIG. 12 is a logic diagram of protection of a zero-sequence overcurrent I section at intervals of 3-8;
FIG. 13 is an adaptive tuning flow diagram of the present invention;
FIG. 14 is a schematic diagram of an adaptive tuning mode of operation file of the present invention;
FIG. 15 is an illustration shown in an open and closed state;
FIG. 16 is a schematic diagram of branches in the outlet unit;
FIG. 17 is a business flow diagram of an embodiment of the present invention;
FIG. 18 is a customized file as applied by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
The method for implementing distribution network longitudinal differential protection based on the 5G technology in this embodiment is based on an intelligent distribution network setting and management system, and an overall frame diagram of the method is shown in fig. 1;
the data source of the network distribution model is divided into two stages:
the first stage is as follows: a distribution network automation system (or graph model management system) data model (part) is used. The model of the current distribution network automation system (or graph model management system) is not perfect and cannot meet the working requirement of setting the intelligent distribution network, so in order to simplify the requirement of manual modeling, the power grid data of the distribution network automation system (or graph model management system) is adopted, and meanwhile, the human intervention (human correction) is carried out to ensure the correctness of the data of the distribution network model. Firstly, obtaining the equivalence and fixed value limitation issued by a main network to a distribution network, and then realizing the functions of a distribution network setting calculation system such as graphic modeling, setting calculation and fault analysis; and the generated electronic fixed value list and the calculation book are reported and adjusted for auditing, and finally the fixed value list is transmitted to an OMS system for circulation.
And a second stage: the distribution network model of a distribution network automation system (or a graph model management system) system is completely adopted. And automatically acquiring a power grid model of the distribution network for analysis, and automatically generating the power grid setting model required by the intelligent distribution network setting system. Therefore, the self-adaptive setting of the distribution network and the management of related data are realized.
The following is a detailed description:
deploying the architecture:
the deployment architecture of the distribution network setting calculation platform is distributed, and the distributed deployment architecture shown in fig. 2 means that each county level dispatcher maintains respective basic data on a local dispatcher server, each county level dispatcher maintains respective setting calculation basic data according to a dispatching administration range, and the county level dispatches can realize interaction of the setting calculation data with the local dispatches in a boundary equivalence mode.
And (4) functional architecture:
as shown in fig. 3, the platform functional architecture is divided into a data layer, a base layer, an application layer and a user layer, and the functions of each layer are as follows:
and (3) a data layer: corresponding to the database, is used for storing all data of the platform, including original data, intermediate data, output data and the like.
Base layer: comprises a basic supporting component and a basic application component. The basic support component comprises a power grid model management component, a power grid graph management component, a topology analysis component and the like and is mainly used for managing basic metadata of models, graphs, topologies and the like; the basic application components comprise a simple fault component, a current maximum value component, a branch coefficient component, a principle setting component, a device setting component and the like, the platform computing function is packaged in the form of components, a service interface is provided for an application layer, and the core of the platform is provided.
An application layer: is the concrete embodiment of the platform function requirement, comprising: modeling and setting, data management, system setting and the like.
And (3) a user layer: the user layer is mainly the interaction of the client and the platform.
Modeling based on a distribution network model system:
and a power grid model data interface provided by a distribution network automation system (or a graph model management system) imports a graph file (SVG format) containing a complete connection relation and a model file (XML format) containing equipment parameters and extension connection into the system, and automatically generates a distribution network graph and a calculation model. The distribution network graph is displayed in a uniform and standard SVG format, as shown in FIG. 4, the display effect is consistent with the display of a power grid model in a distribution network automation system, and the distribution network setting calculation personnel can be favorably familiar with the power grid structure. By analyzing the power grid model data file (XML format), as shown in FIG. 5, parameters such as line length, model, transformer model and capacity are obtained, reference parameters are obtained by automatically matching the equipment models according to a distribution network equipment parameter reference library, and impedance parameters of each equipment are automatically calculated.
Data file description:
the extension name of the distribution network model data file is xml, and the extension name comprises an equipment name, a topological connection relation, basic equipment parameters, an equipment dependency relation and the like.
(1) Major data types
The system at least comprises necessary data analyzed by the distribution network setting system shown in the table.
| Serial number | cime name | Name (R) | Number of |
|
| 1 | PSRType | Type of |
0 | |
| 2 | BaseVoltage or VoltageLevel | Voltage of | 0 | |
| 3 | | Bus bar | 1 | |
| 4 | | Plant station | 0 | |
| 5 | | AC line | 2 | |
| 6 | Breaker | Switch with a |
2 | |
| 7 | | Knife switch | 2 | |
| 8 | LoadBreakSwitch or Fuse | Load switch and |
2 | |
| 9 | | Transformer device | 0 | |
| 10 | TransformerWinding | Transformer winding | 1 on each |
|
| 11 | Junction et al | Connection points, cable heads, etc | 1 | |
| 12 | Terminal | Node number | Corresponding node |
(2) Data representation
The first row of data indicates a unique ID, < cim: XX rdf: ID ═ XXXXXXX' >, and the middle is equipment information, ending with </cim: XX >.
(3) Basic parameters of the equipment
V-AC line
V-shaped transformer
V. others
Graphic file description
The extension name of the distribution network model graphic file is svg, and the data format meets the requirement of the graphic file description specification in the row mark. Including primitives, device angles, sizes, coordinates, etc. And the ID of the device in the graphics svg file should be consistent with that in the data xml file.
Graph batch modeling technology
The batch modeling technology of the distribution network automatically generates a trunk line according to the set number of segments, randomly adds branch lines on the existing line, batch adds cable distribution boxes, power distribution cabinets, ring main units and the like, and adds extension branches in the existing power grid model of the distribution network. The equipment connected with each branch in the cable distribution box, the power distribution cabinet and the ring network cabinet is set once to automatically generate graphs. The distribution network tool box comprises all the devices of the distribution network and supports the random modification of the graphs.
Topology generation and graph generation techniques
And automatically generating a power distribution network graph in a standard SVG format for display by analyzing the data topological connection. The technical problems of complex distribution network modeling and large workload are solved. Graphic element objects contained in the distribution network typical model correspond to database records one by one, one record is automatically added in the database while defining an equipment primitive (line, transformer and bus) object, and attribute parameters and an input interface of the equipment primitive can be modified according to requirements of a user, so that the one-to-one correspondence between the graphics and the database is realized, and the compatibility of the system is ensured.
(1) The following basic primitives can be automatically generated: external equivalent system, two-coil transformer, circuit breaker, circuit, generating line.
(2) And supporting graphical display, wherein the graphic elements in the graph correspond to actual equipment in the power grid, the physical topological relation is analyzed according to the connection relation of parameter input during modeling, and a connection diagram of the outgoing line units is established. The skeleton line set for modeling is shown with a red line.
(3) When the graph is displayed, the length, the impedance, the name of the type number of the segmented line, the CT transformation ratio, the type of the protection device, the protection fixed value of each segment of the stage current and the time fixed value of the stage current can be selectively displayed.
(4) The whole graph picture can be arbitrarily enlarged, reduced and restored, and marks in the graph are synchronously reduced and enlarged during the reduction and the enlargement;
(5) establishing a distribution network tree resource tree according to the hierarchical structure and the regional structure of the power grid, and realizing the navigation and positioning functions of the resource tree; the platform can automatically position the graph by double-clicking the tree nodes in the plant station area, and can also position the tree nodes of the plant station or the outgoing line unit during graph switching.
The following further describes the intelligent setting calculation of the distribution network based on the self-adaptive setting principle:
firstly, setting principle schemes corresponding to a primary switch and a secondary switch are established according to different wiring modes (public network wiring, private network wiring, hand-pull wiring and the like), the upper-lower level relation of the switches configured and protected is automatically analyzed by analyzing received operation mode files (stored in local), the corresponding setting principle schemes are matched, the self-adaption of the setting principles under different grid structures and operation modes is realized, then, the fixed value calculation is carried out, and the one-key setting of the fixed value of the device is completed.
Establishing a setting principle expert database:
principle tuning
And according to the distribution network protection operation setting principle of the city company, completing the development of a distribution network setting platform principle proprietary library, which is shown in figure 6.
The protection operation setting principle is as follows:
(1) first stage and second stage switch protection
The protection of the 10kV line switch outside the transformer substation is reasonably switched on and off according to a configuration principle, the whole timing can be protected in a graded and layered mode according to the installation position and the superior-inferior relation of the switch, and the switch is divided into a first-stage switch and a second-stage switch. The first-stage switch refers to an off-station switch in protection fit with the substation outgoing switch, and the first-stage switch and the second-stage switch comprise the pole-mounted switch and the looped network cabinet inner-ring outgoing switch.
1) First stage switch protection
Overcurrent I-stage protection
Principle 1: and setting according to 0.9 time of the fixed value of the overcurrent II section of the 10kV outgoing line switch of the transformer substation.
Principle 2: setting according to 0.8 times of the fixed value of the overcurrent I section of the 10kV outgoing line switch of the transformer substation.
Description of the principles: generally, setting is carried out according to the principle 1. For a 10kV line of a 35kV transformer substation, the constant value of the overcurrent II section of the outgoing switch is small (limited to less than 600A) due to the large system equivalent impedance, when the setting is performed according to the principle 1, the protection constant value of the overcurrent I section of the first-stage switch is small, the lower-stage protection coordination is not facilitated, and at the moment, the setting is performed according to the principle 2.
The action time is as follows: 0.1 s; when the adjustment is performed according to the principle 2, 0s is taken.
Overcurrent II stage protection
Principle 1: the setting is carried out according to the setting value which is not more than 0.9 times of the setting value of the overcurrent III section of the 10kV outgoing line switch of the transformer substation.
Principle 2: setting according to the maximum load current of the circuit at the rear section of the evasive switch, wherein the maximum load current is generally 1.3 times of the maximum load current.
Description of the principles: and comprehensively considering the principle 1 and the principle 2 to set.
The action time is as follows: 0.4 s.
Reclosing lock
And when the reclosing input condition is met, the reclosing time is 2.5 s.
2) Second stage switch protection
Overcurrent I-stage protection
Principle 1: the first-stage switch overcurrent I section constant value is set according to 0.8 time.
The action time is as follows: 0 s.
Overcurrent II stage protection
Principle 1: setting according to the fixed value of 0.8 times or less than the overcurrent II section of the first-stage switch.
Principle 2: setting according to the maximum load current of the circuit at the rear section of the evasive switch, wherein the maximum load current is generally 1.3 times of the maximum load current.
Description of the principles: and (4) comprehensively considering principle 1 and principle 2 to set values.
The action time is as follows: 0.2 s.
Reclosing lock
And when the reclosing input condition is met, the reclosing time is 2.5 s.
(2) Terminal feeder switch protection
The switching station switch, the ring main unit load outgoing switch and the user demarcation switch are regarded as terminal feeder switches, the two-stage attribution is not brought into, and the protection setting principle is as follows.
1) Switching station switch protection
Overcurrent I-stage protection
Principle 1: and setting 3-6 times of the sum of the distribution transformer rated currents carried by the outgoing line switch.
The action time is as follows: 0 s.
Overcurrent II stage protection
Principle 1: setting according to 1.3-1.5 times of the sum of the distribution transformer rated currents carried by the outgoing line switch.
The action time is as follows: 0.2 s.
2) Ring main unit load outlet switch protection
The ring main unit load outgoing switch is similar to an open-close station outgoing switch, and the protection setting principle is as follows:
overcurrent I-stage protection
Principle 1: setting 3-6 times of the maximum load current carried by the outgoing switch.
The action time is as follows: 0 s.
Overcurrent II stage protection
Principle 1: setting according to 1.3-1.5 times of maximum load current carried by the outgoing line switch.
The action time is as follows: 0.2 s.
(3) User demarcation switch (watchdog) protection
1) Private line subscriber
Overcurrent I-stage protection
Principle 1: and setting according to 0.9 time of the constant value of the overcurrent II section of the 10kV outgoing line switch of the transformer substation.
Principle 2: setting according to 3-6 times of the sum of all distribution transformer rated currents of a user.
Principle 3: setting according to 0.8 times of the fixed value of the overcurrent I section of the 10kV outgoing line switch of the transformer substation.
Description of the principles: generally, the method is adjusted according to the principle 1 and the principle 2. For special line users of a part of 35kV transformer substations, due to the fact that the constant value of the overcurrent II section of the outgoing line switch is small (limited to being smaller than 600A), when values are contradicted according to principles 1 and 2, the setting can be carried out according to principle 3.
The action time is as follows: 0.1 s; when the setting is made according to rule 3, 0s is taken.
Overcurrent II stage protection
Principle 1: setting according to 1.1-1.2 times of the sum of all distribution transformer rated currents of a user.
The action time is as follows: 0.4 s.
2) T-connected user
Overcurrent I-stage protection
Principle 1: setting according to 3-6 times of the sum of all distribution transformer rated currents of a user.
The action time is as follows: 0 s.
Overcurrent II stage protection
Principle 1: setting according to 1.1-1.2 times of the sum of all distribution transformer rated currents of a user.
The action time is as follows: 0.2 s.
Setting device
The device setting mainly takes PCS-9721S-NB as a main part, the device is mainly suitable for distribution automation DTU devices in places such as switching stations/switching stations, distribution rooms, ring main units and the like, and each terminal is suitable for the access of electric quantity within 8 intervals. The main functions of the device are shown in Table 4-1
TABLE 4-1 PCS-9721S-NB device function Table
The setting principle of the device is as follows:
(1) bus differential protection
The operation criterion of the ratio differential element is expressed by the formulas 4-1 and 4-2
4-1, 4-2 ratio differential element action criterion; the action characteristic curve is shown in fig. 7.
(2) Line differential protection
The action equation of the ratio differential relay is shown in the formula 4-3, and the action characteristic curve is shown in FIG. 8.
Equation 4-3 for the rate differential relay action;
the action equation of the zero-sequence differential relay is as shown in formula 4-4:
equation of action of formula 4-4 zero sequence differential relay
(3) Overcurrent protection
The device is provided with two sections of timing limit overcurrent protection, and each section has an independent current fixed value, a time fixed value and a control word. The overcurrent I-section protection logic at the interval 1 and the interval 2 is different from the logic at the interval 3-8. The overcurrent I sections of the interval 1 and the interval 2 are in a locked state by default, and are opened only when bus differential protection exits or network topology protection corresponding to the interval exits, while the overcurrent I section protection of the interval 3-8 is not limited by the condition.
The judgment logic of the overcurrent protection is shown in fig. 9 and 10.
(4) Zero sequence overcurrent protection
When the device is used for a small-resistance grounding system and the grounding zero-sequence current is relatively large, the fault can be isolated by using a direct tripping method. Correspondingly, the device provides two-section zero-sequence overcurrent protection, and only alarms but not outputs when the II-section control word is 0. The judgment logic is as shown in FIGS. 11 and 12.
The zero-sequence overcurrent II section protection logic is similar to the zero-sequence overcurrent I section protection logic, but all the spaced zero-sequence overcurrent II sections are directly opened. In combination with the actual situation of the project, the zero-sequence overcurrent protection only needs to alarm but does not exit.
Overcurrent/zero sequence acceleration protection
When a line is commissioned or power is restored, there may be a fault on the line. In such a case, it is generally desirable that the protection device be able to clear the fault in as short a time as possible, rather than over-flow protection for a timed period. The function can be selected to be switched on/off according to requirements.
Reclosing lock
And (5) switching on the circuit at intervals. The weight-off signal has: the system comprises a bus differential protection action, a failure protection action, a non-voltage trip action, a far trip action, a CT disconnection trip, a large-current blocking trip, a hand trip signal and a TWJ abnormal signal. The function can be selected to be switched on/off according to requirements.
(6) Failure protection
The failure protection function of each interval is realized: if the protection element (except the failure protection, the long trip protection and the CT disconnection trip) does not receive the switch trip position after the action trip of the protection element is delayed and the failure protection is set, the switch refuses the trip, other switches on the tripping bus are closed again, and the other switches do not judge the overcurrent.
The function can be selected to be switched on/off according to requirements.
(7) Non-voltage tripping
The circuit interconnection switch is in a self-switching charging state, is in a closing position and a pressure state before being switched into a switch with a non-pressure tripping function, is converted into a non-current and bus-pressure-free state, and is tripped and closed again after time delay, so that the circuit interconnection switch is ensured to act once. The side-to-side switch of the transformer substation and the side-to-side switch of the interconnection switching room on the trunk path can be selectively put into the function. Other switches on the backbone path do not require this function.
(8) High current lockout trip function
When the protection element judges that tripping is needed, if the phase current is larger than the heavy current lockout tripping fixed value, lockout tripping is conducted and memorized, after the transformer substation side outgoing line switch is tripped in a protection mode, no current is detected, tripping is conducted, heavy closing is conducted, and meanwhile the opposite side switch is tripped far away. The function can be selected to be switched on/off according to requirements.
Self-adaptive setting technology
And selecting the established setting scheme or the setting scheme corresponding to the wiring mode according to the actual setting condition, realizing the self-adaptation of the setting principle under different grid structures and operation modes, and completing the one-key setting of the principle level and the device level fixed value. The overall flow of the scheme is shown in figure 13.
Operation mode file parsing technology
(1) Scanning a real-time operation mode file at regular time to obtain a latest file: locally establishing a folder of a power distribution network real-time operation mode, wherein the name of the folder is defined as RunWayInfo, scanning an operation mode file once in five minutes by a program, and automatically acquiring a latest operation mode file according to the name of the operation mode file;
(2) the operation mode file format is as shown in FIG. 14;
(3) according to the content of fig. 14, the switch ID in the file is automatically matched with the switch in the interface according to the outlet unit ID in the file, so as to acquire the open/close state of the switch.
(4) And comparing the switch state in the operation mode file with the switch state in the current library, if the switch state is changed, correcting the state of the switch in the existing outlet unit according to the real-time operation mode file, starting self-adaptive setting, and performing the next analysis operation of the upper and lower switches.
The upper and lower switch analysis techniques:
(1) the selection rule of the zero-level, first-level and second-level switches in the form of the switching station wiring is described by taking fig. 15 as an example;
1) calculating the sum of the capacities of all transformers under the switching station in the outgoing line unit, wherein the calculation formula is as follows:
note that: stiRepresenting rated capacity of the transformer, RiRepresenting the transformer operating rate (output), LiRepresenting the load importance.
2) Dividing the total volume into three equal parts;
3) searching switching stations with one-third and two-thirds capacities, and if a dividing point is positioned between the two switching stations, selecting the switching station which is close to the power supply;
4) the incoming switch of the outgoing line unit is a zero-level switch; a first-stage switching station at a first boundary point and an incoming switch (closed and protected) of the ring main unit are first-stage switches, and a switch connected with a transformer or a line transformer set (the other side of a line is directly connected with the transformer) is a second-stage switch; the first-stage switching station at the second demarcation point and the incoming line switch (closed and protected) of the ring main unit are second-stage switches;
5) when a multi-stage switching station and a ring main unit exist at the downstream of a first-stage switching station and a ring main unit outgoing line switch between the zero-stage switch and the first-stage switch, a first-stage matching point switch can be selected, and incoming line switches of a lower-stage switching station and the ring main unit are selected as second-stage switches; when a multi-stage switching station and a ring main unit exist at the downstream of a primary switching station and a ring main unit outlet switch between the primary switch and the secondary switch, protection can be put into operation according to a mismatch point setting principle, and the first-stage switch is selected; the other switches (closed, configuration protected) are second stage switches;
(2) the selection rules of the zero-level, first-level, and second-level switches in the branch wiring form are described with reference to fig. 16;
1) calculating the sum of the capacities of the transformers under all branches in the outgoing line unit, wherein the calculation formula is as follows:
note that: stiRepresenting rated capacity of the transformer, RiRepresenting the transformer operating rate (output), LiRepresenting the load importance.
2) Dividing the total volume into three equal parts;
3) the main line switches with the capacity of one third and two thirds are searched to be respectively used as a first-stage switch and a second-stage switch, and if a one-third dividing point is positioned between the two switches, the switch close to the power supply is selected to be used as the first-stage switch and the second-stage switch;
4) the switch at the outlet of the branch line between the zero-level switch and the first-level switch is preferably selected as a first-level switch (for example, 2584 pole opening in fig. 16), and the section switch below the branch, the secondary branch outlet switch, and the branch switch directly T-connected to the main line (for example, 2585 pole opening in fig. 16) are preferably selected as second-level switches;
5) the branch switch between the primary switch and the secondary switch is preferably selected as the secondary matching point, such as 2587 posts in fig. 4.
(3) And filling the divided zero-level switch, the first-level switch and the second-level switch into red in the graph, and flashing for visual display of the switches at all levels.
Research on setting principle matching technology
Matching according to the set setting principle scheme of the zero-level switch, the first-level switch and the second-level switch, then performing constant value setting, and displaying the set constant value in an interface;
and finally generating a proposal according to the associated protection device. Showing a zero-level switch, a first-level switch and a second-level switch in the suggested scheme, and showing fixed values of all the switches;
clicking to download, when the CIME file is used for the first time, newly building a CIME file folder locally, and then generating a fixed value single file in a CIME format in the local CIME file folder according to a protection device associated with each switch, wherein the fixed value single file name is as follows: CIME, only a fixed-value single file is generated when clicking again, and a folder does not need to be repeatedly established.
The distribution network rapid modeling technology based on the objectification technology is an objectification rapid modeling technology based on a ring main unit, a switching station and a multi-stage series supply model, and a distribution network data model is automatically generated by inputting the number of incoming lines and outgoing lines, the series supply stages and the like. And analyzing the data topology connection through a depth-first search algorithm, and automatically generating a power distribution network graph in a standard SVG format for display. The technical problems of complex modeling and large workload of network distribution are solved.
Meanwhile, a distribution network intelligent setting calculation technology based on a self-adaptive setting principle establishes setting principle expert libraries of different wiring types, self-adaptive matching of the setting principle under different network structures is realized through topology analysis, and automatic setting of a fixed value is realized on the basis of objective modeling.
Because the three-section type current protection constant value is greatly influenced by a power grid structure and an operation mode, when a line with frequent operation mode switching is encountered in a power grid with a complex structure, the constant value is easy to mismatch. In the self-adaptive setting technology, the line constant value can be automatically set effectively according to the current power grid condition, but a new constant value cannot be sent to a corresponding protection device, and a worker still needs to go to the site to adjust the constant value, so that the distribution network longitudinal differential protection implementation method based on the 5G technology of the embodiment of the invention adopts the 5G communication technology to transfer the self-adaptively set constant value to the distribution automation main station, and the main station issues the self-adaptively set constant value to the protection device in a 5G communication mode, so that the protection device can adjust the constant value in real time. As shown in fig. 17 and 18.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. A distribution network longitudinal differential protection implementation method based on a 5G technology is characterized by comprising the following steps: the method comprises the following steps:
and transferring the self-adaptive set constant value flow to a distribution automation master station, and issuing the self-adaptive set constant value flow to a protection device by the master station in a 5G communication mode, so that the protection device can adjust the constant value in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110700674.2A CN113659539B (en) | 2021-06-23 | 2021-06-23 | Distribution network longitudinal differential protection implementation method based on 5G technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110700674.2A CN113659539B (en) | 2021-06-23 | 2021-06-23 | Distribution network longitudinal differential protection implementation method based on 5G technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113659539A true CN113659539A (en) | 2021-11-16 |
| CN113659539B CN113659539B (en) | 2024-04-26 |
Family
ID=78477097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110700674.2A Active CN113659539B (en) | 2021-06-23 | 2021-06-23 | Distribution network longitudinal differential protection implementation method based on 5G technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113659539B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838713A (en) * | 2019-11-26 | 2020-02-25 | 山东大学 | 5G network-based distributed differential protection method and system for power distribution network |
| CN112865032A (en) * | 2021-01-13 | 2021-05-28 | 国网安徽省电力有限公司 | Distributed differential protection method and system for power distribution network adapting to 5G communication network |
-
2021
- 2021-06-23 CN CN202110700674.2A patent/CN113659539B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838713A (en) * | 2019-11-26 | 2020-02-25 | 山东大学 | 5G network-based distributed differential protection method and system for power distribution network |
| CN112865032A (en) * | 2021-01-13 | 2021-05-28 | 国网安徽省电力有限公司 | Distributed differential protection method and system for power distribution network adapting to 5G communication network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113659539B (en) | 2024-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yang et al. | Transition to a two-level linear state estimator—Part I: Architecture | |
| CN105373655B (en) | A kind of method of one electrical secondary system connection figure of organic association Intelligent transformer station | |
| CN108334691B (en) | Visual automatic drawing method for power distribution network | |
| CN113659538A (en) | Distribution network intelligent setting method and system based on self-adaptive setting principle | |
| CN101272051B (en) | Information system integration method of electric network production control region and management information region | |
| CN107730093B (en) | System and method for power grid accident re-routing path | |
| CN110266037B (en) | Distributed new energy full-observation modeling method and system based on topology automatic aggregation | |
| CN102521398A (en) | Modeling method for substation-dispatching center two-level distributed type power grid | |
| CN108414849A (en) | Intelligent substation automatization test system and method | |
| CN104318006B (en) | A kind of optimization method of virtual terminals of intelligent substation design | |
| CN108629480A (en) | A kind of electrical power distribution network fault location method based on GIS | |
| CN109327323B (en) | New energy grid-connected power communication network planning and optimizing method and system | |
| CN105678651A (en) | Power grid big data quality standardization-based power grid information management system and method | |
| CN102497019B (en) | Transformer substation-dispatching center two-stage state estimation multi-source data timing and splicing method | |
| CN104573868B (en) | A kind of power distribution network repairing Meshing Method and equipment | |
| CN108388704A (en) | Intelligent distribution area extension modeling based on CIM and integrated platform construction method | |
| CN105870917A (en) | Electric power grid supply system | |
| CN106776750B (en) | Graph-mode integrated digital preplan system for power distribution network | |
| CN113659539B (en) | Distribution network longitudinal differential protection implementation method based on 5G technology | |
| Gu et al. | Self-healing control technology for distribution networks | |
| CN110489729A (en) | The automatic switching method and system of disaster-ridden kind of the power grid of D5000-matpower coupling cascading failure model | |
| CN106786527B (en) | Distribution network loop closing risk analysis method based on provincial and allocation integration | |
| CN113659537A (en) | Cooperative setting and checking method for main network and distribution network | |
| CN105790264A (en) | Electric power grid supplying method | |
| Kamps et al. | Reliability of decentralized network automation systems and impacts on distribution network reliability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |