CN113659539B - 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
- CN113659539B CN113659539B CN202110700674.2A CN202110700674A CN113659539B CN 113659539 B CN113659539 B CN 113659539B CN 202110700674 A CN202110700674 A CN 202110700674A CN 113659539 B CN113659539 B CN 113659539B
- Authority
- CN
- China
- Prior art keywords
- distribution network
- setting
- protection
- switch
- principle
- 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.)
- Active
Links
- 238000005516 engineering process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 28
- 238000007726 management method Methods 0.000 claims description 16
- 238000011160 research Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 21
- 230000009471 action Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 7
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006855 networking Effects 0.000 description 3
- 238000013499 data model Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000969 carrier Substances 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
- 238000013461 design Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000010845 search algorithm Methods 0.000 description 1
- 230000011218 segmentation Effects 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
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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 5G technology-based distribution network longitudinal differential protection implementation method, which comprises the steps of transferring self-adaptively set constant value flow to a distribution automation master station, and transmitting the self-adaptively 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 invention establishes a distribution network longitudinal differential protection implementation mechanism based on a 5G technology, establishes a distribution network protection fixed value real-time dynamic adjustment mechanism in a wide area range, overcomes the defect that fixed value mismatch is easy to occur when three-section current protection encounters a line with a complex structure and frequent operation mode switching, and ensures that the distribution network protection has stronger adaptability to the operation mode and structure of a power grid.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a 5G technology-based distribution network longitudinal differential protection implementation method.
Background
The power distribution network is used as the last link of a power transmission and distribution system, closely contacts with terminal power utilization users, and the safe and stable operation of the power distribution network is the guarantee of high quality and high reliability of power utilization of the users, so the relay protection of the power distribution network serving as the first defense line of the safe operation of the power distribution network is particularly important, and the following problems mainly exist in the aspect of the current power distribution network setting calculation:
(1) The power distribution network equipment is huge in volume, complex in wiring mode, more in T wiring paths, large in traditional graphic modeling setting workload and incapable of guaranteeing the accuracy of equipment parameters;
(2) The grid structure of the power distribution network system equipment is complex, the operation mode is frequently changed, the calculation principle of the current distribution network setting calculation is rough, a necessary checking means is lacked, the adaptability to the grid structure change is poor, and the fixed value safety is insufficient;
(3) The existing fixed value setting calculation system device is complex in modeling, cannot be well suitable for setting calculation of the distribution network, and causes that the setting calculation of the distribution network is carried out manually, a fixed value list is modified, manual intervention is more, the working efficiency is low, and errors are easy to occur;
(4) The large-scale access of the distributed power supply is realized, the traditional single-side power supply is converted into double-end power supply or multi-end power supply, so that the setting calculation difficulty of the relay protection setting value is increased, the adaptability of the protection setting value is not strong, and the power supply reliability level is reduced;
(5) The fixed value list is paper archiving, so that the searching is very inconvenient, and the unified management is difficult to realize.
In order to solve the current situation of the current power distribution network setting calculation, the power distribution network setting calculation efficiency is improved, and the relay protection power distribution network setting calculation system is necessary to be researched.
The 5GSA network communication guarantee scheme comprises three parts of a core network wireless network transmission network. The 5G core network based on the service architecture mainly includes AMF (mobility management function), SMF (session management function) and UPF (user plane function). The gNB (5G wireless base station) designs a new system with a full dynamic structure for adapting to different service demands, and can realize dynamic frame structure and resource allocation, flexible uplink and downlink time slot switching, multiple parameter configuration including sub-carriers, protection time slots and the like, multiple frequency bands and antenna form selection. The core network is connected with the wireless base station through an SPN transmission network. The SPN is a new generation end-to-end layered switching network based on MPLS/SRM, SLICING ETHERNET and wavelength division, and has the properties of flexible service scheduling, high reliability, low time delay, high precision clock, yi Yunwei strict service quality guarantee and the like.
In order to meet the service index, a private network is required 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 and networking, technical capability is deployed, and network capability is configured.
(1) The core network deployment scheme is to meet the transmission delay requirement, the operator core network needs to configure a special UPF for the private network slice, and other network elements can adopt a shared mode. UPF sinks as required, and is as close to the position of the differential terminal as possible, thus completing the access and forwarding of the flow nearby. The position of the private network UPF should be determined according to the position of the differential terminal. Under the condition that the distance between two ends of the communication is short (within 50 km) in a city area, the communication device is preferably arranged in a core machine room of an operator, so that the core network device networking is facilitated; under the condition that the distance from the city center is far, but the distance between the two communication ends is near, the mobile convergence and the access machine room deployment with the shortest sum of the transmission paths between the two communication ends can be selected according to the networking condition of the transmission ring where the base station of the receiver is located.
(2) The deployment scheme of the transmission network is to meet the service bearing requirement with deterministic service quality, and the SPN network introduces Flex technology to provide an end-to-end transmission pipeline based on time division links at the forwarding layer, and has the characteristics of low time delay, transparent transmission, hard isolation and the like. The functions of receiving and repeating data, adding/deleting OAM information, cross connection of data streams, monitoring and protecting and the like can be realized. SPN can provide forwarding capability with route-induced capability 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 nodes and links through which the tunnel passes are fixed, and the route cannot be changed along with the change of the network state, so that the consistency of the data receiving and transmitting route is ensured.
Disclosure of Invention
The invention provides a 5G technology-based distribution network longitudinal differential protection implementation method, which can solve the technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for realizing longitudinal differential protection of a distribution network based on a 5G technology comprises the following steps:
The self-adaptive set constant value flow is transferred to the power distribution automation master station, and the master station adopts a 5G communication mode to send the constant value flow to the protection device, so that the protection device can adjust the constant value in real time.
According to the distribution network longitudinal differential protection implementation method based on the 5G technology, which is disclosed by the invention, a distribution network intelligent setting calculation technology based on a self-adaptive setting principle, a main network and a cooperation setting and checking technical research of the distribution network and a distribution network setting calculation model considering a distributed power supply are adopted, a distribution network longitudinal differential protection implementation mechanism based on the 5G technology is established, a distribution network protection fixed value real-time dynamic adjustment mechanism in a wide area is established, the defect that fixed value mismatch is easy to occur when three-section current protection encounters a line with a complex structure and frequent switching of operation modes is overcome, and the distribution network protection has stronger adaptability to the operation modes and the structure of a power grid.
In general, the invention is based on the 5G distribution network protection device technology, researches and establishes a distribution network protection fixed value real-time dynamic adjustment mechanism in a wide area range, provides effective support for distribution network dispatching operation, and improves the adaptability of distribution network protection to the change of the power grid operation mode.
Drawings
FIG. 1 is an overall frame 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 computing platform of the present invention;
FIG. 3 is a functional architecture diagram of a distribution network tuning computing platform of the present invention;
FIG. 4 is a schematic diagram of a grid model map file of the distribution automation system of the present invention;
FIG. 5 is a schematic diagram of a data file of an automated grid model for a distribution network according to the present invention;
FIG. 6 is a schematic diagram of a 10kV outlet primary and secondary switch;
FIG. 7 is a graph of proportional differential operating characteristics;
FIG. 8 is a schematic diagram of a ratio differential equation of motion curve;
FIG. 9 is a logic diagram of interval 1, interval 2 overcurrent segment I protection;
FIG. 10 is a logic diagram of the over-current I-segment protection at intervals 3-8;
FIG. 11 is a logic diagram of interval 1, interval 2 zero sequence overcurrent I segment protection;
FIG. 12 is a logic diagram of the zero sequence overcurrent I section protection at intervals 3-8;
FIG. 13 is a flow chart of the adaptive tuning 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 of an open-close;
FIG. 16 is a schematic diagram of a branch in the outlet unit;
FIG. 17 is a business flow diagram of an embodiment of the present invention;
FIG. 18 is a custom file for use with an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
The implementation method of the distribution network longitudinal differential protection based on the 5G technology is based on an intelligent distribution network setting and management system, and the whole frame diagram is shown in figure 1;
The distribution network model data sources are divided into two stages:
The first stage: a distribution network automation system (or pattern management system) data model (part) is adopted. The current distribution network automation system (or graph model management system) model is imperfect and can not meet the working requirement of intelligent distribution network setting, so that in order to simplify the requirement of manual modeling, the distribution network automation system (or graph model management system) power grid data are adopted, and at the same time, manual intervention (manual correction) is carried out to ensure the correctness of the distribution network model data. Firstly, obtaining the equivalent value and the fixed value allowance which are issued to the distribution network by the main network, and then realizing the functions of graphic modeling, setting calculation, fault analysis and the like of a distribution network setting calculation system; and reporting the generated electronic fixed value list and the computer book for verification, and finally transmitting the fixed value list to an OMS system for circulation.
And a second stage: the distribution network model of the distribution network automation system (or the pattern management system) is completely adopted. And automatically acquiring a power grid model of the distribution network for analysis, and automatically generating a power grid setting model required by an intelligent distribution network setting system. Thus realizing the self-adaptive setting of the distribution network and the management of related data.
The following is a specific description:
Deployment architecture:
The deployment architecture of the distribution network setting computing platform is distributed, and the "distributed" deployment architecture shown in fig. 2 means that each county scale maintains respective basic data on a local scale server, each county scale maintains respective setting computing basic data according to a dispatching jurisdiction, and the county scale can interact with the local scale in a boundary equivalence mode to achieve setting computing data.
Functional architecture:
As shown in fig. 3, the platform function architecture is divided into a data layer, a base layer, an application layer and a user layer, and the functions of the layers are as follows:
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: including a base support assembly and a base application assembly. The basic supporting 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 providing management of basic metadata such as models, graphs, topologies and the like; the basic application component comprises a simple fault component, a current maximum component, a branch coefficient component, a principle setting component, a device setting component and the like, encapsulates the platform computing function in a component mode, provides a service interface for an application layer and is a core of the platform.
Application layer: is a specific embodiment of the platform function requirement, comprising: modeling and tuning, data management and system setup, etc.
User layer: the user layer is mainly the interaction of the client with the platform.
Modeling based on a distribution network model system:
And (3) importing a graphic file (SVG format) containing complete connection relations and a model file (XML format) containing equipment parameters and topological connection into a power grid model data interface provided by a power grid automation system (or a graphic model management system) to automatically generate a power grid graph and a calculation model. The distribution network graph is displayed in a unified SVG format, and as shown in the following figure 4, the display effect is consistent with the display of a power grid model in the distribution network automation system, so that the distribution network setting calculation personnel are facilitated to be 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, capacity and the like are obtained, the device model is automatically matched according to the distribution network device parameter reference library to obtain reference parameters, and then the resistance parameters of each device are automatically calculated.
Description of data file:
The extension name of the distribution network model data file is xml, and the xml comprises a device name, a topological connection relationship, basic device parameters, a device subordinate relationship and the like.
(1) Primary data type
At least contains the necessary data analyzed by the distribution network setting system shown in the table below.
| Sequence number | Name of cime | Name of the name | Node count |
| 1 | PSRType | Device type | 0 |
| 2 | BaseVoltage or VoltageLevel | Voltage (V) | 0 |
| 3 | BusbarSection | Bus bar | 1 |
| 4 | Substation | Station of factory | 0 |
| 5 | ACLineSegment | AC line | 2 |
| 6 | Breaker | Switch | 2 |
| 7 | Disconnector | Knife switch | 2 |
| 8 | LoadBreakSwitch or Fuse | Load switch and fuse | 2 |
| 9 | PowerTransformer | Transformer | 0 |
| 10 | TransformerWinding | Transformer winding | 1 Per side |
| 11 | Junction etc | Connection point, cable head, etc | 1 |
| 12 | Terminal | Node number | Corresponding node |
(2) Data presentation form
The first line of data marks a unique ID, < cim: XXrdf: ID= "XXXXXX" >, with device information in the middle, ending with </cim: XX >.
(3) Basic parameters of the device
V-shaped ac line
V-shaped transformer
Other V-shaped
Graphic file description
The extension name of the distribution network model graphic file is svg, and the data format meets the requirements of the graphic file description specification in the line standard. Including primitives, device angles, sizes, coordinates, etc. And the ID of the device in the graphic svg file should be consistent with that in the data xml file.
Graphic batch modeling technology
The batch modeling technology of the distribution network automatically generates main lines according to the set segmentation number, randomly adds branch lines on the existing lines, adds cable tapping boxes, power distribution cabinets, ring main units and the like in batches, and adds extension branches in the existing power grid model of the distribution network. The equipment connected with each branch in the cable tapping box, the power distribution cabinet and the ring net cabinet is set at one time to automatically generate a graph. The distribution network tool box contains all devices of the distribution network and supports arbitrary modification of graphics.
Topology generation and graph generation technique
And automatically generating a power distribution network graph in a standard SVG format for display by analyzing data topological connection. The technical problems of complex modeling and large workload of the distribution network are solved. Graphic element objects contained in a distribution network typical model are in one-to-one correspondence with database records, a record is automatically added into the database while an equipment graphic element (line, transformer and bus) object is defined, and attribute parameters of the equipment graphic element and an input interface thereof can be modified according to the requirements of a user, so that one-to-one correspondence of the graphic and the database is realized, and the compatibility of a system is ensured.
(1) The following basic primitives can be automatically generated: external equivalent system, two-coil transformer, circuit breaker, circuit, busbar.
(2) And supporting graphical display, wherein the graphic elements in the graph correspond to actual equipment in the power grid, analyzing physical topological relation according to the connection relation of parameter input during modeling, and establishing a connection diagram of the outlet unit. The trunk lines set up for modeling are shown in red lines.
(3) When the graph is displayed, the length, the impedance, the sectional line number name, the CT transformation ratio, the protection device model, the protection fixed value and the time fixed value of each section of the phase current can be selectively displayed.
(4) The whole graphic picture can be arbitrarily enlarged, reduced and restored, and the marks in the drawing are synchronously scaled during scaling;
(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 patterns by double clicking the plant area tree nodes, and can also position the plant or outgoing line unit tree nodes during pattern switching.
The following further describes the intelligent tuning calculation of the distribution network based on the adaptive tuning principle:
Firstly, setting principle schemes corresponding to a first-level switch and a second-level switch are established according to different wiring modes (public network wiring, private network wiring, hand-in-hand wiring and the like), the upper and lower level relations of the switches configured with protection are automatically analyzed and matched according to received operation mode files (stored locally), self-adaptation of setting principles under different grid structures and operation modes is realized according to the corresponding setting principle schemes, then setting value calculation is carried out, and one-key setting of device setting values is completed.
Setting principle expert base establishment:
Principle setting
The development of the private library of the distribution network tuning platform principle is completed according to the distribution network protection operation tuning principle of the city company, and the development is shown in fig. 6.
The protection operation setting principle is as follows:
(1) First stage, second stage switch protection
The protection of the 10kV line switch outside the transformer substation is reasonably switched according to the configuration principle, and the protection is regularly graded and layered according to the installation position and the upper and lower level relation of the switch, so that the switch is divided into a first level switch and a second level switch. The first-stage switch refers to an off-site switch which is in protective fit with the transformer substation outlet switch, and the first-stage switch and the second-stage switch comprise the pole-mounted switch and the ring main unit inner ring network outlet switch.
1) First stage switch protection
Overcurrent I-section protection
Principle 1: and setting according to 0.9 times of the constant value of the overcurrent II section of the 10kV outlet switch of the transformer substation.
Principle 2: and setting the constant value of the overcurrent I section of the 10kV outlet switch of the transformer substation by 0.8 times.
Description of principle: the method is generally carried out according to the principle 1. For 10kV lines of part 35kV transformer substations, because of larger system equivalent impedance, the overcurrent II section of the outlet switch has smaller fixed value (limited by less than 600A), when the overcurrent I section of the first-stage switch is set according to the principle 1, the overcurrent I section of the first-stage switch has smaller protection fixed value, and is not beneficial to lower-stage protection cooperation, and at the moment, the overcurrent I section of the first-stage switch is set according to the principle 2.
Action time: 0.1s; and (3) setting according to the principle 2, and taking 0s.
Overcurrent II section protection
Principle 1: and setting the value of the overcurrent III section of the 10kV outgoing switch of the transformer substation by 0.9 times or less.
Principle 2: the maximum load current of the back-end circuit of the switch is set according to the hiding speed, and is generally 1.3 times of the maximum load current.
Description of principle: and comprehensively considering principle 1 and principle 2 setting.
Action time: 0.4s.
Reclosing valve
And when the reclosing input condition is met, the reclosing time is 2.5s.
2) Second stage switch protection
Overcurrent I-section protection
Principle 1: setting the constant value of the overcurrent I section according to the first-stage switch by 0.8 times.
Action time: 0s.
Overcurrent II section protection
Principle 1: setting according to the value which is not more than 0.8 times of the constant value of the overcurrent II section of the first-stage switch.
Principle 2: the maximum load current of the back-end circuit of the switch is set according to the hiding speed, and is generally 1.3 times of the maximum load current.
Description of principle: and comprehensively considering principle 1 and principle 2 to set and take values.
Action time: 0.2s.
Reclosing valve
And when the reclosing input condition is met, the reclosing time is 2.5s.
(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 included, and the protection setting principle is as follows.
1) Switch protection for switching station
Overcurrent I-section protection
Principle 1: setting according to 3-6 times of the sum of the rated current of the distribution transformer carried by the outlet switch.
Action time: 0s.
Overcurrent II section protection
Principle 1: setting according to 1.3-1.5 times of the sum of the rated current of the distribution transformer carried by the outlet switch.
Action time: 0.2s.
2) Ring main unit load outgoing line switch protection
The ring main unit load outgoing switch is similar to an switching station outgoing switch, and the protection setting principle is as follows:
Overcurrent I-section protection
Principle 1: setting according to 3-6 times of the maximum load current carried by the outlet switch.
Action time: 0s.
Overcurrent II section protection
Principle 1: setting according to 1.3-1.5 times of the maximum load current carried by the outlet switch.
Action time: 0.2s.
(3) User demarcation switch (watchdog) protection
1) Private line user
Overcurrent I-section protection
Principle 1: and setting the overcurrent II section fixed value of the 10kV outgoing switch of the transformer substation by 0.9 times.
Principle 2: setting according to 3-6 times of the sum of rated currents of all the distribution transformers of users.
Principle 3: and setting the constant value of the overcurrent I section of the 10kV outlet switch of the transformer substation by 0.8 times.
Description of principle: setting is generally carried out according to principle 1 and principle 2. For special line users of part 35kV transformer substations, because the value of the overcurrent II section of the outgoing line switch is smaller (limited by less than 600A), when the values according to the principle 1 and the principle 2 contradict, the special line users can be set according to the principle 3.
Action time: 0.1s; when the setting is made according to principle 3, 0s is taken.
Overcurrent II section protection
Principle 1: setting according to 1.1-1.2 times of the sum of rated currents of all the distribution transformers of the users.
Action time: 0.4s.
2) T-connect user
Overcurrent I-section protection
Principle 1: setting according to 3-6 times of the sum of rated currents of all the distribution transformers of users.
Action time: 0s.
Overcurrent II section protection
Principle 1: setting according to 1.1-1.2 times of the sum of rated currents of all the distribution transformers of the users.
Action time: 0.2s.
Device setting
The device setting mainly takes PCS-9721S-NB as a main part, and the device is mainly suitable for power distribution automation DTU devices in places such as switching stations, distribution rooms, ring main units and the like, and each terminal is suitable for electric quantity access 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) Differential protection
The action criteria of the ratio differential element are 4-1 and 4-2
The action criteria of the ratio differential elements in the formulas 4-1 and 4-2; the operation characteristic curves are shown in fig. 7.
(2) Differential protection of circuit
The equation of motion of the ratio differential relay is shown in equations 4-3, and the motion characteristic curve is shown in fig. 8.
Equation of action for the 4-3 ratio differential relay;
the motion equation of the zero sequence differential relay is as follows in 4-4:
equation of motion for 4-4 zero sequence differential relay
(3) Overcurrent protection
The device is provided with two sections of time-limiting overcurrent protection, and each section is provided with an independent current fixed value, an independent time fixed value and a control word. The overcurrent I-section protection logic of interval 1 and interval 2 is different from the logic of intervals 3-8. The overcurrent I sections of the intervals 1 and 2 are in a locking state by default and are opened only when the bus differential protection exits or the network topology protection corresponding to the intervals exits, and the overcurrent I section protection of the intervals 3 to 8 is not limited by the condition.
The judgment logic of the overcurrent protection is as shown in fig. 9 and 10.
(4) Zero sequence overcurrent protection
When the device is used for a small-resistance grounding system, the grounding zero-sequence current is relatively large, and a direct tripping method can be used for isolating faults. Correspondingly, the device provides two sections of zero sequence overcurrent protection, and only alarms and does not exit when the II section control word is 0. The judgment logic is as shown in fig. 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 interval zero sequence overcurrent II sections are directly opened. By combining the actual conditions of the project, the zero sequence overcurrent protection only alarms and cannot be output.
Overcurrent/zero sequence acceleration protection
When the line is put into operation or power is restored, there may be a fault on the line. In such cases, it is often desirable for the protection device to be able to cut the fault in as short a time as possible, rather than cut the fault with time-limited over-current protection. This function can be switched on/off as required.
Reclosing valve
And (5) reclosing at line intervals. The closed weight signal is: a bus differential protection action, a failure protection action, a non-voltage tripping action, a remote tripping action, a CT disconnection tripping, a high-current locking tripping, a hand tripping signal and a TWJ abnormal signal. This function can be switched on/off as required.
(6) Failure protection
The failure protection function of each interval is realized: if the protection element (other protection except failure protection, far jump protection and CT broken line tripping) does not receive the switch tripping position after the setting delay of the failure protection, the switch is judged to refuse to jump, other switches on the jump bus are closed again, and the other switches are not judged to flow.
This function can be switched on/off as required.
(7) Non-pressure tripping
The circuit interconnecting switch is in a self-switching charging state, is in a combined and pressed state before being put into a non-voltage tripping function, is converted into a non-current and non-voltage bus, and is tripped and closed again after time delay, so that only one action is ensured. The opposite side switch of the transformer substation and the opposite side switch of the tie switch exchange houses on the main 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 the transformer substation is to be tripped, if the phase current is larger than a high-current locking tripping fixed value, locking tripping and memorizing are carried out, after the transformer substation side outlet switch is subjected to protection tripping, the transformer substation side outlet switch is detected to be tripped and closed again after no voltage and no current are detected, and meanwhile the transformer substation side outlet switch is far jumped. This function can be switched on/off as required.
Self-adaptive setting technology
And selecting an established setting scheme or a setting scheme corresponding to a wiring mode according to the actual setting condition, realizing the self-adaption of the setting principle under different grid structures and operation modes, and completing the one-key setting of principle-level and device-level setting values. The overall flow of the scheme is shown in fig. 13.
Operation mode file analysis technology
(1) The method comprises the steps of scanning real-time operation mode files at fixed time and obtaining the latest files: the method comprises the steps of locally establishing a folder of a real-time operation mode of the distribution network, defining the name of the folder as RunWayInfo, scanning an operation mode file once in five minutes by a program, and automatically acquiring the latest operation mode file according to the operation mode file name;
(2) The running mode file format is 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 outgoing line unit ID in the file, so as to obtain the on-off 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.
Upper and lower stage switch analysis technology:
(1) The selection rule of the zero-level, first-level and second-level switches in the wiring form of the switching station is described by taking fig. 15 as an example;
1) The sum of the capacities of the transformers under all the switching stations in the outgoing line unit is calculated, and the calculation formula is as follows:
Note that: s ti represents the transformer rated capacity, R i represents the transformer operating rate (output), and L i represents the load importance.
2) Trisecting the total capacity;
3) Searching for an opening and closing station under one third and two thirds of capacity, and selecting an opening and closing station which is closer to a power supply if a boundary point is positioned between the two opening and closing stations;
4) The wire inlet switch of the wire outlet unit is a zeroth-order switch; the first-stage switching station at the first demarcation point and the switch of the ring main unit, which is closed and protected by configuration, are first-stage switches, and the switch connected with the transformer or the line transformer group, which is directly connected with the transformer at the other side of the line, is second-stage switch; the first-stage switching station at the second demarcation point and the incoming line switch (closed and configured for protection) 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 one-stage switching station between the zero-stage switch and the one-stage switch and a ring main unit outlet switch, the multi-stage switching station and the ring main unit can be selected as one-stage matching point switches, and a lower-stage switching station and a wire inlet switch of the ring main unit are selected as two-stage switches; when the multi-stage switching station and the ring main unit exist at the downstream of the primary switching station and the ring main unit outlet switch between the primary switch and the secondary switch, protection can be put into according to a mismatch point setting principle, and the primary 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 form of branch wiring are described by taking fig. 16 as an example;
1) The sum of the capacities of transformers under all branches in the outgoing line unit is calculated, and the calculation formula is as follows:
Note that: s ti represents the transformer rated capacity, R i represents the transformer operating rate (output), and L i represents the load importance.
2) Trisecting the total capacity;
3) The main line switch under the third and the second thirds capacity is searched and used as a first-stage switch and a second-stage switch respectively, and if the third demarcation point is positioned between the two switches, the switch which is closer to the power supply is selected 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 (such as 2584 column switch in fig. 16), and the sectional switch below the branch, the secondary branch outlet switch and the branch switch directly connected to the main line in a T manner (such as 2585 column switch 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 junction, as shown by the 2587 column in fig. 4.
(3) The divided zero-level switch, the first-level switch and the second-level switch are filled with red in the figure and flash for visual display of the switches at all levels.
Study on tuning principle matching technique
Matching according to the set tuning principle schemes of the zero-level switch, the first-level switch and the second-level switch, then tuning the fixed value, and displaying the tuned fixed value in an interface;
and finally generating a proposal scheme according to the associated protection device. The proposal comprises displaying a zero-level switch, a first-level switch and a second-level switch, and displaying the fixed value of each switch;
Clicking 'downloading', creating a CIME folder locally when the CIME is used for the first time, and then generating a fixed value single file in CIME format in the local CIME folder according to the protection device associated with each switch, wherein the fixed value single file name is as follows: and when the user clicks again, only a fixed value single file is generated, and the folder is not required to be repeatedly built.
The rapid modeling technology of the distribution network based on the objectification technology, namely the rapid modeling technology of the objectification based on the ring main unit, the switching station and the multistage serial supply model, automatically generates a distribution network data model by only inputting the number of incoming lines, outgoing lines, serial supply stages and the like. And analyzing data topological 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 the distribution network are solved.
Meanwhile, a distribution network intelligent setting calculation technology based on a self-adaptive setting principle is used for establishing setting principle expert libraries of different wiring types, self-adaptive matching of the setting principles under different network structures is realized through topology analysis, and automatic setting of a setting value is realized on the basis of objective modeling.
Because the three-section type current protection fixed value is greatly affected by the power grid structure and the operation mode, the fixed value mismatch phenomenon easily occurs when the operation mode is frequently switched in the power grid with the complex structure. In the self-adaptive setting technology, the line fixed value can be effectively and automatically set according to the current power grid condition, but the new fixed value still cannot be sent to the corresponding protection device, and a worker still needs to go to the site to adjust the fixed value, so that the 5G technology-based distribution network longitudinal differential protection implementation method of the embodiment of the invention adopts the 5G communication technology to transfer the self-adaptively set fixed value to the distribution automation master station, and the master station sends the self-adaptively set fixed value to the protection device in a 5G communication mode, so that the protection device can adjust the fixed value in real time. As shown in fig. 17 and 18.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A method for realizing longitudinal differential protection of a distribution network based on a 5G technology is characterized by comprising the following steps: the method comprises the following steps:
The self-adaptive set constant value flow is transferred to a power distribution automation master station, and the master station sends the constant value flow to a protection device in a 5G communication mode, so that the protection device can adjust the constant value in real time;
The method specifically comprises a distribution network intelligent setting calculation technology based on a self-adaptive setting principle, a main network and a cooperation setting and checking technology research of the distribution network, and a distribution network setting calculation model considering a distributed power supply, a distribution network longitudinal differential protection implementation mechanism based on a 5G technology is established, and a distribution network protection fixed value real-time dynamic adjustment mechanism in a wide area range is established;
The intelligent distribution network setting and management system is based, a deployment architecture of the intelligent distribution network setting and management system is distributed, the distributed deployment architecture means that each county adjustment maintains respective basic data on a local adjustment server, each county adjustment maintains respective setting calculation basic data according to a dispatching jurisdiction, and the county adjustment can interact with the local adjustment through a boundary equivalence mode;
The intelligent distribution network setting and managing system is used for providing a power grid model data interface for the intelligent distribution network setting and managing system, importing a graph file containing complete connection relation and a model file containing equipment parameters and topological connection into the intelligent distribution network setting and managing system, and automatically generating a distribution network graph and a calculation model;
The distribution network graph is displayed in a unified SVG format, the display effect is consistent with the display of a power grid model in the distribution network automation system, and the distribution network setting calculation personnel are facilitated to be familiar with the power grid structure; the method comprises the steps of obtaining line length, model and transformer model and capacity parameters by analyzing a power grid model data file, automatically matching equipment models according to a distribution network equipment parameter reference library to obtain reference parameters, and automatically calculating impedance parameters of all equipment;
the intelligent setting calculation of the distribution network based on the self-adaptive setting principle is also included:
firstly, setting principle schemes corresponding to a primary switch and a secondary switch are established according to different wiring modes, namely public network wiring, private network wiring and hand-in-hand wiring, the upper and lower level relations of the switches configured with protection are automatically analyzed and matched with the corresponding setting principle schemes by analyzing received operation mode files, self-adaption of setting principles under different grid structures and operation modes is realized, then fixed value calculation is carried out, and one-key setting of a fixed value of the device is completed.
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 CN113659539A (en) | 2021-11-16 |
| CN113659539B true 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 |
|---|---|
| CN113659539A (en) | 2021-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10325062B2 (en) | Method and device for generating engineering topology of digital substation | |
| Zidan et al. | Fault detection, isolation, and service restoration in distribution systems: State-of-the-art and future trends | |
| CN108334691B (en) | Visual automatic drawing method for power distribution network | |
| CN106877509B (en) | Distribution network line fault studying and judging and alarm analyzing method | |
| Yang et al. | Transition to a two-level linear state estimator—Part I: Architecture | |
| CN108318782B (en) | Power distribution network fault area identification method based on network topology and distribution transformer power failure information | |
| CN107730093B (en) | System and method for power grid accident re-routing path | |
| CN102521398A (en) | Modeling method for substation-dispatching center two-level distributed type power grid | |
| CN113659538A (en) | Distribution network intelligent setting method and system based on self-adaptive setting principle | |
| CN108414849A (en) | Intelligent substation automatization test system and method | |
| CN110266037B (en) | Distributed new energy full-observation modeling method and system based on topology automatic aggregation | |
| CN102193504A (en) | Safety and stability control system modeling method in power system dynamic simulation | |
| CN103107593A (en) | Circulation analysis system and circulation analysis method of complicated power distribution network loop closing operation | |
| CN105678651A (en) | Power grid big data quality standardization-based power grid information management system and method | |
| CN114050578B (en) | Power distribution network online load flow calculation method, device, equipment and medium | |
| CN105870917A (en) | Electric power grid supply system | |
| CN113659539B (en) | Distribution network longitudinal differential protection implementation method based on 5G technology | |
| CN110489729A (en) | The automatic switching method and system of disaster-ridden kind of the power grid of D5000-matpower coupling cascading failure model | |
| Lendák et al. | Electric power system one-line diagram generation with branch and bound algorithm | |
| CN106786527B (en) | Distribution network loop closing risk analysis method based on provincial and allocation integration | |
| Kamps et al. | Reliability of decentralized network automation systems and impacts on distribution network reliability | |
| CN114400631A (en) | Low-voltage transformer area differential protection method and system based on broadband power line carrier communication | |
| CN113659540B (en) | Power distribution network setting calculation method considering distributed power supply and storage medium | |
| CN105790264A (en) | Electric power grid supplying method | |
| CN113013871A (en) | Load transfer method for power distribution network equipment during fault and maintenance |
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 |