CN113972653B - Grid rack - Google Patents
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- CN113972653B CN113972653B CN202111285324.0A CN202111285324A CN113972653B CN 113972653 B CN113972653 B CN 113972653B CN 202111285324 A CN202111285324 A CN 202111285324A CN 113972653 B CN113972653 B CN 113972653B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application discloses a grid rack. Wherein, this electric wire netting rack includes: the power grid main network comprises a plurality of power supply subareas, each power supply subarea comprises a plurality of voltage class substations, and the plurality of power supply subareas are connected through subarea interconnecting lines; the power grid distribution network comprises a plurality of switching stations, and the high-voltage side of each switching station is connected in a target connection mode: the two switching stations are independently powered by a first number of substations and connected by a second number of buses, and the buses are connected in a cross way and are mutually reserved; the low-voltage side of the switching station is provided with a quick change-over switch for completing the switching between the main power supply and the standby power supply; the low-voltage side is also provided with a distributed energy storage system for supplying power to the low-voltage side load when the power grid fails. The application realizes the high-reliability and high-intelligent green grid rack of the multi-dimensional full-link voltage level of the integrated main distribution network, and solves the technical problems of power failure of users and low power supply reliability caused by the failure of part of lines in the existing grid rack.
Description
Technical Field
The application relates to the technical field of power grids, in particular to a power grid rack.
Background
In the running process of the power grid, the power supply reliability of the power grid is closely related to the structure of the grid frame of the power grid, and if the grid frame structure is unreasonable, the power quality of a user can be influenced. For example, when any main line fails, a user experiences a short-time power outage during load transfer by the tie switch. If the power supply area covers a special important user group, for example, a high-frequency area held by important activities such as politics, economy, culture, science and technology, the power supply reliability and the power quality level can directly influence the normal operation of the key load, further influence the external presentation effect of the activities, and even cause a certain social influence. Therefore, the grid frame structure of the large movable high-frequency region forms the basic guarantee of the power supply reliability and the electric energy quality, and extremely high requirements are provided for the construction, operation and monitoring level of the power distribution network.
In the related art, research on a high-reliability grid structure of a power grid is insufficient. In some application scenes, the high-reliability distribution network mode and the power supply link are not fully covered, and the dual-power supply mode of part of station rooms cannot meet the power supply reliability requirements of important users; part of equipment has longer operation life and insufficient spare parts, sensitive loads are not provided with customized power equipment, and the low-voltage side green emergency power supply capacity is insufficient; meanwhile, the intelligent operation and maintenance monitoring information system is not supported strongly and is not equipped with advanced application functions.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the application provides a grid rack, which at least solves the technical problems that a user fails when part of lines of the existing grid rack fail, and the power supply reliability is low.
According to an aspect of an embodiment of the present application, there is provided a grid rack, including: the power grid main network comprises a plurality of power supply partitions, each power supply partition comprises a plurality of voltage class substations, wherein the power supply partitions are connected through partition interconnecting lines, and the partition interconnecting lines are used for completing information interaction and load transfer among the power supply partitions; the electric wire netting join in marriage the net, with electric wire netting main network connection, wherein, including a plurality of switching stations in the electric wire netting joins in marriage the net, the high-voltage side of switching station adopts the target mode of connection to wire, the target mode of connection includes: the two switching stations are independently powered by a first number of substations, are connected by a second number of buses, and are in cross connection and are mutually standby; the low-voltage side of the switching station is provided with a quick change-over switch which is used for completing the switching between a main power supply and a standby power supply of the low-voltage side; the low-voltage side is provided with a distributed energy storage system, and the distributed energy storage system is used for supplying power to the load of the low-voltage side when the power grid fails.
Optionally, the power supply partition at least comprises a third number of 500kV substations and a fourth number of 220kV hub substations, where the third number of 500kV substations and the fourth number of 220kV hub substations are located at the periphery of the power supply partition and operate in a closed loop.
Optionally, the power supply partition further comprises a 110kV transformer substation, and the 110kV transformer substation is wired in a unit mode.
Optionally, the fast change-over switch at least includes: the solid-state transfer switch is used for extending a topological link of the low-voltage side of the switching station and is used for completing millisecond-level switching between a main power supply and a standby power supply of the low-voltage side, and continuous power supply of a load connected to the low-voltage side is guaranteed.
Optionally, the types of the distributed energy storage system at least include: the flywheel energy storage system is distributed on low-voltage distribution equipment with impact characteristic sensitive load on the low-voltage side of the switching station and is used for supplying power to the low-voltage distribution equipment when the power grid fails, so that the transient stability of the distribution system is ensured.
Optionally, the opening and closing station at least includes: switch cabinet and distribution transformer, the switch cabinet includes at least: high tension switchgear, quick switch cabinet and low tension switchgear.
Optionally, the switching station is further configured with a telecontrol communication device, wherein the telecontrol communication device has telemetry, telecommand and remote control functions and is used for carrying out information interaction with an upper-level substation of the switching station; the switching station is also provided with a protection measurement and control device, wherein the protection measurement and control device is arranged in the switch cabinet and has overcurrent protection, quick-break protection, zero-sequence current protection and reclosing functions.
Optionally, an intelligent sensor system is installed in the switch cabinet, and the intelligent sensor system is used for monitoring the running state information of the switch cabinet and giving an alarm when the switch cabinet fails; the intelligent monitoring system is used for monitoring whether the behaviors of target objects around the switch cabinet are standard or not and giving an alarm when the behaviors of the target objects are not standard.
Optionally, an emergency power supply access switch is configured on each section of bus on the low-voltage side of the switching station, wherein the emergency power supply access switch is used for supplying power through connection with a standby power generation vehicle when all power supplies of the switching station are in power failure.
Optionally, the plurality of open-close stations are all 10kV open-close stations, the high voltage side of the 10kV open-close station is 10kV, and the low voltage side of the 10kV open-close station is 0.4kV.
When the power grid frame is constructed, the power grid main network and the power grid distribution network are respectively designed, the power grid main network is connected by partition connecting lines to realize power supply support, the power grid distribution network is mainly optimized for an opening and closing station, the risk resistance capacity is improved by adopting a cross mutual backup wiring mode at the 10kV high-voltage side of the opening and closing station, disaster recovery equipment is designed at the 0.4kV low-voltage side, the power supply reliability is improved by introducing a quick change-over switch and a distributed energy storage system, meanwhile, the power grid main network and the power grid distribution network are mutually matched, and each voltage level is firmly supported, so that the multi-dimensional full-link voltage-class high-reliability and high-intelligent green power grid frame integrated by the main distribution network is realized, and the technical problems that users have power failure and low power supply reliability are caused when part of lines in the existing power grid frame are failed are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic structural view of an alternative grid rack in accordance with an embodiment of the present application;
FIG. 2 is a schematic diagram of an alternative grid main grid structure in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of an alternative "E244" wiring scheme in accordance with an embodiment of the present application;
FIG. 4 is a schematic diagram of SSTS wiring on the low side of an alternative switching station in accordance with an embodiment of the present application;
Fig. 5 is a schematic diagram of an alternative flywheel energy storage system accessing the low pressure side of an open-close station according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In the related art, when any main line fails, a user can experience a short-time power failure in the load transfer process by the tie switch, and the power failure process can have a larger influence on the power quality of the user. Meanwhile, the existing grid rack structure has the following defects: the high-reliability distribution network mode does not realize full coverage, and the dual-power supply mode of part of station rooms cannot meet the power supply reliability requirements of important users; part of equipment has longer operation life and insufficient spare parts, and sensitive loads are not provided with customized power equipment; the intelligent operation and maintenance monitoring information system is not supported strongly and is not equipped with advanced application functions.
In order to solve the above problems, the embodiment of the application provides an expanded design concept of a network structure with multiple power supplies and multiple contacts (Extened Multi-substation Multi-source Multi-liaison, which is abbreviated as EMMM), which mainly realizes Multi-power supply partition interconnection in the aspect of a main network, forms a strong and reliable power supply support, improves a network structure of a power distribution network, is additionally provided with a high-capacity energy storage device in a concentrated way, is provided with a low-voltage configuration quick change-over switch, is provided with an uninterrupted power supply device in a dispersed way, develops towards an intelligent direction, and adopts advanced information network technology and control technology to improve the interconnection and mutual capacity and intelligent mutual capacity of the power distribution network. Through carrying out multiple measures such as expansion formula, intelligent transformation to current room, reduce the complexity of protection configuration, reduce the degree of difficulty of engineering construction to improve power supply guarantee ability, emergent handling ability, resource allocation ability.
Specifically, fig. 1 shows an alternative EMMM-structure-based grid rack, which includes a grid main and a grid distribution network, wherein:
The power grid main network comprises a plurality of power supply subareas, each power supply subarea comprises a plurality of voltage class substations, wherein the plurality of power supply subareas are connected through subarea interconnecting lines, and the subarea interconnecting lines are used for completing information interaction and load transfer among the plurality of power supply subareas.
In some optional embodiments of the present application, each power supply partition at least includes a third number of 500kV substations and a fourth number of 220kV hub substations, where the third number of 500kV substations and the fourth number of 220kV hub substations are located in a peripheral closed loop operation of the power supply partition. Optionally, the power supply partition further comprises a 110kV transformer substation, and the 110kV transformer substation is wired in a unit mode.
Fig. 2 shows an alternative grid main network rack, wherein a 220kV power supply partition is formed by 3 500kV substations and a plurality of 220kV hub substations, 500kV is peripherally looped, a load station goes deep into a city center area, and the 220kV hub stations in the area are looped. Wherein, special connecting lines are erected between different partitions for completing information interaction between different power supply partitions, when any power supply partition fails, other partitions can immediately receive failure information and provide mutual support, the mode flexibly realizes multi-direction power supply interconnection and intercommunication, forms a strong and reliable power supply support, and can transfer all loads through the power grid of the stage when any main element in a power supply partition fails or abnormally exits, thereby ensuring the stable operation of the power system.
Optionally, at 110kV voltage class, form the relatively independent power supply scope, adopt unit wiring (that is a generator corresponds a main transformer, a high voltage factory uses the transformer) in the station, this operational mode is simple, and equipment maintenance is convenient, has the load transfer ability of certain proportion each other between the transformer substation, mainly shifts the load through the 10kV electric wire netting of next level.
The electric wire netting joins in marriage the net, is connected with the electric wire netting main network, wherein, includes a plurality of switching stations in the electric wire netting joins in marriage the net, and the high-voltage side of switching station adopts the target mode of connection to wire, and the target mode of connection includes: the two switching stations are independently powered by the first number of substations, are connected by the second number of buses, and are in cross connection and are mutually standby; the low-voltage side of the switching station is provided with a quick change-over switch which is used for completing the switching between a main power supply and a standby power supply of the low-voltage side; the low-voltage side is provided with a distributed energy storage system, and the distributed energy storage system is used for supplying power to a load of the low-voltage side when a power grid fails.
For the power grid distribution network, the optimization design is mainly performed for the switching stations. The switching station is mainly a 10kV switching station, the high-voltage side of the switching station is 10kV, and the low-voltage side of the switching station is 0.4kV. The main equipment types of the 10kV switching station include: 10kV high tension switchgear, fast switch over switchgear, 0.4kV low tension switchgear, in addition, install a plurality of 2000kVA distribution transformer generally.
For the 10kV high-voltage side, the wiring mode is firstly adjusted, in some alternative embodiments of the application, the target wiring mode of E244 (2 stations 4 power supplies 4 are connected and mutually standby) is adopted for wiring, as shown in figure 3, two switching stations # 1 and # 2 are independently supplied with power by A, B, C, D upper-level power transformation stations, and 4 connecting lines are arranged between internal buses in a crossing manner. The power supply meets the N-2 power supply standard in normal operation, namely reliable power supply can be carried out under the condition of power failure of 2 paths of superior power supplies; the power supply standard of 'N-3' can be met under extreme conditions, and reliable power supply under the condition of complete stop of a 3-way power supply can be realized. Through the reliable wiring mode, the switching station can ensure normal power supply as long as any 10 kilovolt power supply is powered, has extremely strong risk resisting capability, and the power supply reliability reaches more than 99.9999 percent.
In some optional embodiments of the present application, the switching station is further configured with a telecontrol communication device, where the telecontrol communication device has telemetry, telecommand and remote control functions, and is used for performing information interaction with an upper-level substation of the switching station; the switching station is also provided with a protection measurement and control device, wherein the protection measurement and control device is arranged in the switch cabinet and has the functions of overcurrent protection, quick-break protection, zero-sequence current protection and reclosing.
The 10kV switching station is internally provided with a protection measurement and control device, a microcomputer type protection measurement and control integrated device is generally adopted, the protection measurement and control device has the functions of overcurrent protection, quick-break protection, zero sequence current protection and reclosing, and the protection measurement and control device can be installed in a switch cabinet on site. Specifically, I-section interphase overcurrent protection and I-section zero sequence overcurrent protection are configured on a 10kV incoming line, and adjacent bus-tie automatic switching is blocked by protection actions; configuring II sections of interphase overcurrent protection and II sections of zero sequence overcurrent protection on a 10kV feeder line, wherein the protection acts on tripping; the 10kV sectional cabinet is provided with automatic switching and acceleration protection after the composite voltage is blocked; and an independent combined ring protection device is arranged in the 10kV bus-tie isolation cabinet.
Based on the high-reliability power supply requirement, the switching station is required to realize the three-remote functions of remote measurement, remote signaling and remote control, so that a remote communication device is also arranged in the 10kV switching station, the data information acquisition of the microcomputer five-prevention locking device, the 10kV protection measurement and control device, the direct current system and the central signal system can be conveniently realized, and the information is sent to the master station system through the interface of the protection manager and the communication equipment, so that the information interaction between the main network and the distribution network of the power network is realized.
In some alternative embodiments of the application, an intelligent sensor system is usually installed in the 10kV high-voltage switch cabinet, and the intelligent sensor system is used for monitoring the running state information of the switch cabinet and giving an alarm when the switch cabinet fails; an intelligent monitoring system is usually installed on the switch cabinet, and is used for monitoring whether the behaviors of target objects around the switch cabinet are standard or not and giving an alarm when the behaviors of the target objects are monitored to be out of standard.
Specifically, a plurality of intelligent sensors are integrated in the 10kV high-voltage switch cabinet, the operation state information such as the temperature, the humidity, the partial discharge, the mechanical characteristic operation parameters and the like of the equipment is monitored and analyzed in an omnibearing and real-time manner, and when an abnormal condition is found, the remote alarm can be given out in time. In addition, the 10kV high-voltage switch cabinet is also provided with a face recognition intelligent monitoring camera, so that irregular operation behaviors of operators can be automatically prompted and alarmed, for example, the operators can not wear safety helmets correctly, insulating gloves are not worn, and the system can automatically recognize and alarm, so that various unsafe operation accidents are avoided.
For the 0.4kV low-voltage side of the 10kV switching station, the design scheme of the embodiment of the application mainly comprises the following steps: a customized power module (dual-power switching equipment) is adopted to expand and extend a low-voltage side network topology link, for example, a fast switch is arranged to realize fast switching between a main power supply and a standby power supply, so that the power supply reliability is improved; and a green emergency power supply is introduced at the tail end of an important user, for example, a distributed energy storage system is installed, so that the power supply reliability is further improved.
Wherein, above-mentioned quick change over switch includes at least: a Solid-state switch (Solid STATIC TRANSFER SWITCH, abbreviated as SSTS), where SSTS is an extension of a topology link on the low-voltage side of the switching station, and is used to complete millisecond switching between a main power supply and a standby power supply on the low-voltage side, so as to ensure continuous power supply to a load connected to the low-voltage side; the distributed energy storage system comprises at least: the flywheel energy storage system can be installed on low-voltage distribution equipment with impact characteristic sensitive load on the low-voltage side of the switching station in a distributed mode and is used for supplying power to the low-voltage distribution equipment when a power grid fails, and transient stability of the distribution system is guaranteed.
Specifically, in order to further improve the power supply reliability of the low-voltage load, the 0.4kV low-voltage side of the 10kV switching station is innovatively subjected to SSTS functional expansion, and by installing SSTS in the station, millisecond-level switching of the main power supply and the standby power supply is realized, so that the carried load can be ensured to be continuously and reliably supplied with power. If one power supply fails, the millisecond-level power supply automatic switching operation can be realized, the electric equipment such as lamplight, sound and even the most sensitive computer cannot be affected, and the user zero perception of high-reliability power supply is realized. Thus, the SSTS functionality extension within the station will provide the strongest and most reliable power supply guarantee for various important loads. An alternative 0.4kV low-voltage side SSTS wiring of a 10kV switching station is shown in figure 4, and the power supply reliability of a sensitive load is improved by connecting 600A SSTS between a 0.4kV bus and the sensitive load.
For low voltage distribution equipment with impact characteristic sensitive loads, flywheel energy storage systems can be installed in a distributed manner if the internal conditions of the station room allow, so that the transient stability and the power supply reliability of the distribution system are improved. Under the condition of short-time power failure, the distributed flywheel energy storage system can transmit active power to the power distribution network in a short time, so that enough transition time is provided for the process from the power failure of the mains supply to the switching of the mains supply or the starting and running of the generator, the pressure on the power distribution system caused by the sudden change of the load can be effectively relieved, meanwhile, the voltage fluctuation and the voltage drop phenomenon can be restrained, and the distributed flywheel energy storage system has an important effect on improving the quality of electric energy and the reliability of power supply. Because the flywheel energy storage system belongs to a distributed green power supply, the finally obtained grid rack is also a green grid.
Fig. 5 shows an alternative scheme of accessing a flywheel energy storage system to a 0.4kV low-voltage side bus of a 10kV switching station, wherein SSTS or ATS is an automatic transfer switch, and the power supply reliability of an important load is improved by accessing the flywheel energy storage system between the 0.4kV bus and the important load bus.
In some optional embodiments of the application, an intelligent sensor system is also installed in the 0.4kV low-voltage switch cabinet, and the intelligent sensor system is used for monitoring the running state information of the switch cabinet and giving an alarm when the switch cabinet fails; the intelligent monitoring system is used for monitoring whether the behaviors of the target objects around the switch cabinet are standard or not and giving an alarm when the behaviors of the target objects are not standard.
Because the 0.4kV low-voltage switch cabinet directly carries the power load, the switch has the remote control operation function, automatic detection devices such as a temperature sensor and the like are also arranged in the switch, the intelligent monitoring of the total station operation environment is realized, and the monitoring devices such as a gas sensor, a temperature and humidity sensor, a face recognition high-definition camera and the like, a dust remover, a temperature controller and the like are arranged in the total station, so that the integrated comprehensive monitoring and control of the operation environment, security protection and fire control are realized, and the station room environment is ensured to always accord with the operation regulations.
In the embodiment of the application, the following technical characteristics are realized by improving the 0.4kV low-voltage switch cabinet: 1) The modularized SSTS product is applied to the low-voltage switch cabinet, and has the advantages of small maintenance amount, flexible application, space saving and the like; 2) The low-voltage switch comprehensively selects an MIC intelligent control unit, and two remote information are sent to a background system through a switch body communication module by virtue of a gateway, so that on the premise of richer uploading data, the traditional communication mode of collecting signals through a CT (current transformer), transferring the signals into a network meter and transferring the signals into the background system is replaced, the CT installation space is saved, and the arrangement and secondary wiring in the cabinet are obviously simplified; 3) The intelligent operation and maintenance system is matched with an in-station environment monitoring system, so that information acquisition of temperature and humidity in the low-voltage switch cabinet and the temperature of copper bar lap joints is realized, and basic conditions are provided for intelligent operation and maintenance; 4) The intelligent terminal technology is selected, the bus single-wire system can be dynamically displayed on a touch screen arranged on a low-voltage switch cabinet door, operation and maintenance personnel can read real-time data synchronous with a background system at any time, and active operation and maintenance are possible through information such as pre-stored equipment accounts, equipment and component data, equipment history operation records, maintenance records and the like.
In combination, the switch cabinet is designed reliably, the switching device with high power supply continuity and intelligent components are selected, communication is simple and convenient, comprehensive information except electric quantity information is acquired, and a background system and a local terminal system are perfectly combined, so that the low-voltage system in an E244 wiring mode becomes an intelligent low-voltage distribution system which is reliable in operation, simple and convenient to operate, simple and convenient to communicate, perfect in active operation and maintenance information and capable of guaranteeing power supply continuity for important loads.
Optionally, an emergency power supply access switch is configured on each section of bus on the low-voltage side of the switching station, wherein the emergency power supply access switch is used for supplying power through connection with a standby power generation vehicle when all power supplies of the switching station are in power failure.
Specifically, in order to further improve disaster recovery and combat readiness guarantee capability under extreme conditions, an emergency power supply access switch is independently arranged on each section of bus with an important load of 0.4kV, an aviation plug technology is adopted, plug-in access is very simple, convenient and rapid, and emergency access requirements of a power generation vehicle and a UPS power supply vehicle are met. If all power supplies of the switching station are powered off due to special reasons or unreliability, the device can be quickly connected with a standby power generation vehicle to quickly restore the power supply.
By combining the main power grid network and the distribution power grid network, the coverage of all-link voltage levels from 500kV of the main power grid network to 0.4kV of the end user can be realized, wherein the voltage levels are mutually conducted and mutually carried, and the reliability of the grid frame is greatly improved.
When the power grid frame is constructed, the power grid main network and the power grid distribution network are respectively designed, the power grid main network is connected with each other by adopting a plurality of power supply subareas through subarea connecting lines to realize power supply support, the power grid distribution network is mainly optimized for an opening and closing station, the risk resistance capacity is improved by adopting a cross mutual backup wiring mode at the 10kV high-voltage side of the opening and closing station, disaster recovery equipment is designed at the 0.4kV low-voltage side, the power supply reliability is improved by introducing a quick change-over switch and a distributed energy storage system, meanwhile, the power grid main network and the power grid distribution network are mutually matched, and all voltage levels are firmly supported, so that the power grid frame of the multi-dimensional full-link voltage level integrated by the main distribution network is realized. Because the network frame wiring mode of the power grid adopts the on-site and distributed protection configuration, no differential protection is needed, no inter-station signal transmission is needed, the main protection and the backup protection both adopt the conventional protection of the distribution network without directional inter-phase overcurrent, zero sequence overcurrent and the like, the upper and lower time coordination is obvious, the configuration is simple, the reliability is high, and the influence of inter-station communication is avoided, thereby solving the technical problems that the power failure of a user is caused when part of lines in the existing network frame are failed, and the power supply reliability is not high.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the various embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (7)
1. A grid rack, comprising:
the power grid main network comprises a plurality of power supply partitions, each power supply partition comprises a plurality of voltage class substations, wherein the power supply partitions are connected through partition interconnecting lines, and the partition interconnecting lines are used for completing information interaction and load transfer among the power supply partitions;
The power supply subarea at least comprises a third number of 500kV substations and a fourth number of 220kV pivot substations, wherein the third number of 500kV substations and the fourth number of 220kV pivot substations are located on the periphery of the power supply subarea to perform closed-loop operation;
The electric wire netting join in marriage the net, with electric wire netting main network connection, wherein, including a plurality of switching stations in the electric wire netting joins in marriage the net, the high-voltage side of switching station adopts the target mode of connection to wire, the target mode of connection includes: the two switching stations are independently powered by a first number of substations, are connected by a second number of buses, and are in cross connection and are mutually standby; the low-voltage side of the switching station is provided with a quick change-over switch which is used for completing the switching between a main power supply and a standby power supply of the low-voltage side; the low-voltage side is provided with a distributed energy storage system, and the distributed energy storage system is used for supplying power to the load of the low-voltage side when the power grid fails;
Wherein the types of the distributed energy storage system at least comprise: the flywheel energy storage system is distributed on low-voltage distribution equipment with impact characteristic sensitive load at the low-voltage side of the switching station and is used for supplying power to the low-voltage distribution equipment when the power grid fails, so that the transient stability of the distribution system is ensured;
And each section of bus at the low-voltage side of the switching station is independently provided with an emergency power supply access switch, wherein the emergency power supply access switch is used for supplying power through being connected with a standby power generation vehicle when all power supplies of the switching station are in power failure.
2. The grid rack of claim 1, further comprising a 110kV substation in the power supply section, the 110kV substation being wired in units.
3. The grid rack of claim 1, wherein the fast switch comprises at least: the solid-state transfer switch is used for extending a topological link of the low-voltage side of the switching station and is used for completing millisecond-level switching between a main power supply and a standby power supply of the low-voltage side, and continuous power supply of a load connected to the low-voltage side is guaranteed.
4. The grid rack of claim 1, wherein the switching station comprises at least: switch cabinet and distribution transformer, the switch cabinet includes at least: high tension switchgear, quick switch cabinet and low tension switchgear.
5. The grid rack of claim 4 wherein,
The switching station is also provided with a telecontrol communication device, wherein the telecontrol communication device has telemetry, telecommand and remote control functions and is used for carrying out information interaction with an upper-level substation of the switching station;
The switching station is also provided with a protection measurement and control device, wherein the protection measurement and control device is arranged in the switch cabinet and has overcurrent protection, quick-break protection, zero-sequence current protection and reclosing functions.
6. The grid rack of claim 4 wherein,
An intelligent sensor system is arranged in the switch cabinet, and is used for monitoring the running state information of the switch cabinet and giving an alarm when the switch cabinet fails;
the intelligent monitoring system is used for monitoring whether the behaviors of target objects around the switch cabinet are standard or not and giving an alarm when the behaviors of the target objects are not standard.
7. The grid rack of any one of claims 1 to 6, wherein each of the plurality of open-close stations is a 10kV open-close station, a high voltage side of the 10kV open-close station is 10kV, and a low voltage side of the 10kV open-close station is 0.4kV.
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| CN113984896A (en) * | 2021-11-01 | 2022-01-28 | 国网北京市电力公司 | Method and device for determining defect size of grounding electrode of transmission tower |
| CN114285173B (en) * | 2022-03-03 | 2022-05-27 | 广东电网有限责任公司佛山供电局 | Power supply area bus voltage linkage monitoring method and system |
| CN116073523B (en) * | 2023-03-14 | 2023-06-16 | 广东电网有限责任公司梅州供电局 | Power supply system, low-voltage distribution line monitoring method and monitoring device thereof |
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