CN112865166A - Device and method for flexibly interconnecting low-voltage transformer areas - Google Patents

Device and method for flexibly interconnecting low-voltage transformer areas Download PDF

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Publication number
CN112865166A
CN112865166A CN202110103576.0A CN202110103576A CN112865166A CN 112865166 A CN112865166 A CN 112865166A CN 202110103576 A CN202110103576 A CN 202110103576A CN 112865166 A CN112865166 A CN 112865166A
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China
Prior art keywords
low
interconnected
voltage transformer
switch cabinet
current switch
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Pending
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CN202110103576.0A
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Chinese (zh)
Inventor
刘海涛
邵瑶
徐旖旎
熊雄
季宇
吴鸣
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China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
State Grid Shanghai Electric Power Co Ltd
Original Assignee
China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
State Grid Shanghai Electric Power Co Ltd
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Application filed by China Online Shanghai Energy Internet Research Institute Co ltd, State Grid Corp of China SGCC, State Grid Shanghai Electric Power Co Ltd filed Critical China Online Shanghai Energy Internet Research Institute Co ltd
Priority to CN202110103576.0A priority Critical patent/CN112865166A/en
Publication of CN112865166A publication Critical patent/CN112865166A/en
Pending legal-status Critical Current

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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J13/00002—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 monitoring
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • 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
    • 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
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a device and a method for flexibly interconnecting low-voltage transformer areas, wherein the device comprises: a plurality of low-pressure zones, flexible interconnected containers; the flexible interconnected container comprises a direct-current switch cabinet, an energy storage system and a control system; each of the plurality of low-voltage transformer areas collects direct current into the direct current switch cabinet through an incoming line of the direct current switch cabinet through a corresponding AC/DC bidirectional converter, and the plurality of low-voltage transformer areas are interconnected through the direct current switch cabinet; the direct-current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system; the control system of the flexible interconnected container monitors the interconnected low-voltage transformer areas and performs optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.

Description

Device and method for flexibly interconnecting low-voltage transformer areas
Technical Field
The invention relates to the technical field of power distribution system planning, in particular to a device and a method for flexibly interconnecting low-voltage transformer areas.
Background
The grid-connected access of large-scale distributed photovoltaic, the wide popularization of power distribution and novel loads represented by electric energy replacing loads such as electric automobiles and electric heating directly influence the electric energy quality and operation control of the existing power distribution area, and the large-scale disordered access also causes the problem of insufficient capacity of the power distribution area and a power line, and needs to invest a large amount of funds to increase the capacity and expand the capacity. On the other hand, the problem of large load difference of the transformer areas caused by inconsistent economic structures in the same area is that the access public variable capacity is gradually increased along with the promotion of the electrification engineering of countryside construction by governments, so that a large number of transformer areas have heavy load risks and cannot be solved by increasing capacity and distribution point investment, and the transformer areas with light loads and capacity not fully utilized also exist in the same area. Therefore, the load balancing and energy optimizing capacity of the station intervals can be improved to a certain extent by mutually supplying the station intervals in the same area through interconnection, and the pressure of upgrading and transforming a power grid is relieved. At present, methods based on topology reconstruction, switch combination state switching and the like are mostly adopted for inter-platform area interconnection and mutual power supply, but in the interconnection and mutual power supply process in the traditional alternating current mode, due to the characteristics of closed-loop design and open-loop operation of an alternating current power grid, a bus connection switch between platform areas is always in a cold standby state when a system is in normal operation, and the mutual power controllability and the load balancing capability of the bus connection switch are not enough to support the requirements of rapid development of source and load two ends in the current platform area.
The development and mature application of the high-voltage flexible direct-current transmission technology stimulates the extension of the flexible direct-current technology to the low-voltage field to a certain extent, and a technology needs to be provided so as to realize flexible interconnection of low-voltage transformer areas.
Disclosure of Invention
The technical scheme of the invention provides a device and a method for flexibly interconnecting low-voltage transformer areas, which aim to solve the problem of how to flexibly interconnect the low-voltage transformer areas.
In order to solve the above problems, the present invention provides an apparatus for flexibly interconnecting low-voltage lands, the apparatus comprising: a plurality of low-pressure zones, flexible interconnected containers; the flexible interconnected container comprises a direct-current switch cabinet, an energy storage system and a control system;
each of the plurality of low-voltage transformer areas collects direct current into the direct current switch cabinet through an incoming line of the direct current switch cabinet through a corresponding AC/DC bidirectional converter, and the plurality of low-voltage transformer areas are interconnected through the direct current switch cabinet; the direct-current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
the control system of the flexible interconnected container monitors the interconnected low-voltage transformer areas and performs optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
Preferably, the energy storage system is charged or discharged based on a power rate strategy.
Preferably, an alternating current incoming line switch is arranged on the incoming line side of the AC/DC bidirectional converter.
Preferably, the direct current switch cabinet comprises an outlet wire connected with the charging pile.
Preferably, the flexible interconnected container controls the plurality of low-voltage transformer areas based on the goal of load balancing, so that the plurality of low-voltage transformer areas realize load balancing.
In accordance with another aspect of the present invention, there is provided a method for flexibly interconnecting low voltage bays, the method comprising:
collecting direct current into the direct current switch cabinet through the inlet wire of the direct current switch cabinet of the flexible interconnected container by each low-voltage transformer area through a corresponding AC/DC bidirectional converter, and interconnecting the low-voltage transformer areas through the direct current switch cabinet; the direct-current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
monitoring the interconnected low-voltage transformer areas through the control system of the flexible interconnected container, and performing optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
Preferably, the method further comprises the following steps: and charging or discharging through the energy storage system based on the electricity price strategy.
Preferably, an alternating current incoming line switch is arranged on the incoming line side of the AC/DC bidirectional converter.
Preferably, the direct current switch cabinet comprises an outlet wire connected with the charging pile.
Preferably, the flexible interconnected container controls the plurality of low-voltage transformer areas based on the goal of load balancing, so that the plurality of low-voltage transformer areas realize load balancing.
The technical scheme of the invention provides a device and a method for flexibly interconnecting low-voltage transformer areas, wherein the device comprises the following steps: a plurality of low-pressure zones, flexible interconnected containers; the flexible interconnected container comprises a direct-current switch cabinet, an energy storage system and a control system; each low-voltage transformer area in the plurality of low-voltage transformer areas collects direct current into a direct-current switch cabinet through the inlet wire of the direct-current switch cabinet through a corresponding AC/DC bidirectional converter, and the plurality of low-voltage transformer areas are interconnected through the direct-current switch cabinet; the direct current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system; the control system of the flexible interconnected container monitors the interconnected low-voltage transformer areas and performs optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data. The technical scheme of the invention can effectively improve the integral operation condition of the platform area system through point-to-point flexible interconnection, and specifically comprises the following steps: in the interconnected station area device, all stations are mutually 'hot standby', so that the standby capacity of a single station is greatly saved, and the investment of primary equipment is saved; the load rate of a single transformer is improved, and the overall loss of the transformer is reduced; the power flow controller actively adjusts the power flow, so that the flexible control of the power flow can be realized; the power flow controller can provide reactive power, so that the reactive power compensation equipment of a conventional transformer area system is saved; the photovoltaic, energy storage and electric automobile centralized access are facilitated. According to the technical scheme, the low-voltage transformer area system implements interconnection and mutual supply on a plurality of transformer areas through a flexible direct current technology, so that the current operation situation of the transformer areas is changed, the power supply level of the transformer areas is improved in a multi-dimension mode, and a novel scheme of advanced application functions of the transformer areas is realized.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a schematic diagram of an apparatus for flexibly interconnecting low-voltage bays in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of a flexible interconnected container according to a preferred embodiment of the present invention;
FIG. 3 is a schematic geographical diagram of a Ningbo North Lun Shuangliocun distribution transformer district system according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a Ningbo North Lun Shuangliocun transformation area flexible interconnected container, according to a preferred embodiment of the present invention; and
fig. 5 is a schematic flow chart of a method for flexibly interconnecting low-voltage zones according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural view of an apparatus for flexibly interconnecting low-voltage lands according to a preferred embodiment of the present invention. The invention aims to provide a low-voltage transformer area flexible interconnection device, the implementation mode of the invention can be popularized to the construction of a future distribution transformer area, can be widely applied to the scenes that a large number of distributed power supplies and controllable loads are connected into the transformer area, and has wide application prospect and popularization approach in the future by combining the rapid development trend of the distributed power supplies in China and the controllable loads represented by electric automobiles in the future.
As shown in fig. 1, the present invention provides an apparatus for flexibly interconnecting low-voltage bays, the apparatus comprising: a plurality of low-pressure zones, flexible interconnected containers; the flexible interconnected container comprises a direct-current switch cabinet, an energy storage system and a control system;
each low-voltage transformer area in the plurality of low-voltage transformer areas collects direct current into a direct-current switch cabinet through the inlet wire of the direct-current switch cabinet through a corresponding AC/DC bidirectional converter, and the plurality of low-voltage transformer areas are interconnected through the direct-current switch cabinet; the direct current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
the control system of the flexible interconnected container monitors the interconnected low-voltage transformer areas and performs optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
Preferably, the energy storage system is charged or discharged based on a power rate strategy.
Preferably, an alternating current incoming line switch is arranged on the incoming line side of the AC/DC bidirectional converter.
Preferably, the direct current switch cabinet comprises an outlet wire connected with the charging pile.
Preferably, the flexible interconnected container controls the plurality of low-voltage transformer areas based on the goal of load balancing, so that the plurality of low-voltage transformer areas realize load balancing.
According to the invention, a plurality of power distribution areas are interconnected through flexible interconnection containers to share the residual capacity of each other, so that the aim of balancing load is achieved; meanwhile, an energy storage system is configured in the flexible interconnection container, and reasonable charging and discharging can be carried out under the grid-connected normal operation state of the interconnection system according to the electricity price information, so that the aim of peak clipping and valley filling is achieved, and the operation economy of the platform area system is improved to a certain extent.
The internal layout schematic diagram of the flexible interconnected container provided by the invention is shown in fig. 2, wherein respective low-voltage standby feeders of n transformer areas are introduced into the container and respectively converge into a direct-current switch cabinet after passing through n AC/DC bidirectional converters, and an AC incoming switch is arranged at the AC/DC incoming side; n outgoing lines of the direct-current switch cabinet are respectively connected into the energy storage and charging pile to form n-in n-out layout; and secondary equipment such as a central controller, a local monitoring master station, a direct current screen and the like are simultaneously configured in the container and used for efficiently managing and controlling the transformer area interconnection system at different time scales.
The invention firstly provides the concept of the prefabricated flexible interconnection container in the transformer area, realizes the plug and play of functions by intensive configuration and meets the flexible networking requirement of the transformer area interconnection system.
Compared with a micro-grid cluster system scheme, the power control method can complete inter-station power mutual aid only by configuring a plurality of power flow controllers DC/AC and 1 set of control system, is rapid and flexible to control, and realizes decoupling control of power four-quadrant ms level, so that the method has advancement in real-time power control, and is lower in construction cost on the premise of realizing application of the same function.
Compared with a common distribution area flexible interconnection engineering scheme, the power flow controller, the direct current power distribution cabinet and the secondary control system are integrated into the container, and the plurality of direct current outlets are configured to be connected into the energy storage system, so that the distribution area system can have advanced scheduling functions of peak clipping, valley filling, emergency control, participation in power grid regulation and the like on the premise of realizing ms-level power mutual aid control, and meanwhile, partial data of the distribution area can be uploaded to four main stations for display, so that the method has advancement in advanced application.
Compared with a platform area micro-grid system scheme, the invention can form a pre-installed platform area flexible interconnection system by carrying out intensive configuration through the container, and compared with distributed configuration, the intensive configuration has advancement from engineering construction and rapid networking.
The invention provides a scheme of a low-voltage transformer area flexible interconnection system, which is specifically realized in the following way:
fig. 3 shows a geographical schematic diagram of a distribution transformer area system of Ningbo Beilun-Shuangliocun, in which 20 users (average load rate 20%) are accessed to the No. 1 area, 200 users (average load rate 54%) are accessed to the No. 2 area, and 80 users (average load rate 20%) are accessed to the No. 5 area. In the geographic position, the distance between the No. 2 platform area and the No. 5 platform area is about 150 meters, and the distance between the No. 1 platform area and the two previous platform areas is about 800 meters. No. 1, No. 2 and No. 5 platform become on the post becomes, and platform becomes, switch, concentrator, platform become terminal, SVG all integrate to in the JP cabinet. The platform transformers are 1 path of 10kV incoming lines and 3 paths of 400V feeder lines, wherein the platform transformer No. 1, the platform transformer No. 2 and the platform transformer No. 5 only use 2 paths of feeder lines, 1 path of feeder line is reserved for standby, and only 2 feeder line holes are formed in the JP cabinet body; the 3 rd station change and the 4 th station change are used for the 3 rd feeder. A zero-gram switch is arranged on the 10kV incoming line, a disconnecting link is arranged on the 400V low-voltage main incoming line, and an idle switch is arranged on the outlet side of the 3-path feeder line. At present, the information acquisition resolution of 5 station-to-station terminals is 15 minutes.
According to the invention, a set of flexible platform area interconnection device is built among platform areas No. 1, 2 and 5 of Ningbo Beilun Shuangliocun, the device is shown in figure 4, a flexible interconnection container of the flexible interconnection device comprises 3 250kW bidirectional DC/AC converters, and an alternating current incoming line switch is embedded in each converter. The 3 transformer areas are collected into a direct current switch cabinet through respective DC/AC converters to form a wiring mode of a common direct current bus, the direct current switch cabinet is 3 in and 3 out, 1 line of 3 outgoing lines is connected into an energy storage system, the other 2 lines are connected into a rapid charging pile for standby, and the incoming and outgoing line switches in the direct current switch cabinet are integrated with a rapid protection function. The energy storage capacity of the lithium iron phosphate battery is 300kWh, and the lithium iron phosphate battery is connected into a direct current switch cabinet through 200kW bidirectional DC/DC. In the secondary aspect, 1 central controller and 1 set of local monitoring master station are configured to monitor and control the running state of the interconnected system of the transformer area in real time, and an optimized scheduling instruction is assigned to the interconnected system based on the prediction data. Meanwhile, a plurality of auxiliary devices such as rapid protection, metering, direct current screens and cables are configured, so that the flexible interconnected container system can work normally. The 3 transformer areas are interconnected through flexible interconnected containers to share the residual capacity of each other, and the aim of load balancing is achieved. Meanwhile, an energy storage system is configured in the flexible interconnection container, reasonable charging and discharging can be carried out under the grid-connected normal operation state of the interconnection system according to the electricity price information, the goal of peak clipping and valley filling is achieved, and the operation economy of the platform area system is improved to a certain extent.
The device for flexibly interconnecting the low-voltage transformer areas can achieve the following effects:
1) when the 3 transformer areas normally operate, the problem of instantaneous overload of the transformer areas is solved through power supply, load balance among distribution transformers and phases in a system is realized, the load rate is reduced to below 60%, and line loss is reduced; meanwhile, dynamic capacity increase is realized according to the load increase condition, the load bearing capacity of the distribution transformer is greatly improved, and unnecessary capacity increase distribution point investment is reduced.
2) The container system is accessed to the alternating current transformer area bus through 3 DC/AC, and active and reactive quick support can be carried out on each transformer area so as to solve the problems of power quality such as transformer area system voltage and three-phase unbalance.
3) And the energy storage system in the platform area interconnection system reasonably formulates a charging and discharging strategy according to the electricity price information to realize peak clipping and valley filling, and the running economy of the platform area interconnection system is improved to a certain extent.
4) When 1 or 2 transformer areas lose power due to external power grid faults, the interconnected system realizes power transfer in a fault state through the DC/AC converter, and the power supply reliability of the transformer area system is improved.
Fig. 5 is a schematic flow chart of a method for flexibly interconnecting low-voltage zones according to a preferred embodiment of the present invention. As shown in fig. 5, the present invention provides a method for flexibly interconnecting low-voltage lands, the method comprising:
step 501: collecting direct current into a direct current switch cabinet through the inlet wires of the direct current switch cabinet of the flexible interconnected container by each low-voltage transformer area through a corresponding AC/DC bidirectional converter, and interconnecting the low-voltage transformer areas through the direct current switch cabinet; the direct current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
step 502: monitoring the interconnected low-voltage transformer areas through a control system of the flexible interconnected container, and performing optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
Preferably, the method further comprises the following steps: and charging or discharging through the energy storage system based on the electricity price strategy.
Preferably, an alternating current incoming line switch is arranged on the incoming line side of the AC/DC bidirectional converter.
Preferably, the direct current switch cabinet comprises an outlet wire connected with the charging pile.
Preferably, the flexible interconnected container controls the plurality of low-voltage transformer areas based on the goal of load balancing, so that the plurality of low-voltage transformer areas realize load balancing.
According to the invention, a plurality of power distribution areas are interconnected through flexible interconnection containers to share the residual capacity of each other, so that the aim of balancing load is achieved; meanwhile, an energy storage system is configured in the flexible interconnection container, and reasonable charging and discharging can be carried out under the grid-connected normal operation state of the interconnection system according to the electricity price information, so that the aim of peak clipping and valley filling is achieved, and the operation economy of the platform area system is improved to a certain extent.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (10)

1. An apparatus for flexibly interconnecting low-voltage bays, the apparatus comprising: a plurality of low-pressure zones, flexible interconnected containers; the flexible interconnected container comprises a direct-current switch cabinet, an energy storage system and a control system;
each of the plurality of low-voltage transformer areas collects direct current into the direct current switch cabinet through an incoming line of the direct current switch cabinet through a corresponding AC/DC bidirectional converter, and the plurality of low-voltage transformer areas are interconnected through the direct current switch cabinet; the direct-current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
the control system of the flexible interconnected container monitors the interconnected low-voltage transformer areas and performs optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
2. The apparatus of claim 1, the energy storage system to charge or discharge based on a power rate policy.
3. The apparatus of claim 1, wherein an AC incoming switch is disposed on an incoming side of the AC/DC bi-directional converter.
4. The apparatus of claim 1, the dc switchgear comprising an outlet connected to a charging post.
5. The apparatus of claim 1, the flexible interconnect container controls a plurality of low-voltage stations based on a load balancing goal such that the plurality of low-voltage stations achieve a balanced load.
6. A method for flexibly interconnecting low-voltage lands, the method comprising:
collecting direct current into the direct current switch cabinet through the inlet wire of the direct current switch cabinet of the flexible interconnected container by each low-voltage transformer area through a corresponding AC/DC bidirectional converter, and interconnecting the low-voltage transformer areas through the direct current switch cabinet; the direct-current switch cabinet comprises a plurality of outgoing lines, wherein at least one outgoing line is connected with the energy storage system;
monitoring the interconnected low-voltage transformer areas through the control system of the flexible interconnected container, and performing optimized dispatching on the interconnected low-voltage transformer areas based on the prediction data.
7. The method of claim 6, further comprising: and charging or discharging through the energy storage system based on the electricity price strategy.
8. The method of claim 6, wherein an incoming line side of the AC/DC bidirectional converter is configured with an AC incoming line switch.
9. The method of claim 6, the DC switchgear comprising an outlet connected to a charging post.
10. The method of claim 6, the flexible interconnect container controls a plurality of low-voltage stations based on a load balancing goal such that the plurality of low-voltage stations achieve a balanced load.
CN202110103576.0A 2021-01-26 2021-01-26 Device and method for flexibly interconnecting low-voltage transformer areas Pending CN112865166A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113452027A (en) * 2021-07-27 2021-09-28 山东鲁软数字科技有限公司智慧能源分公司 Energy scheduling system and method for low-voltage flexible direct power distribution transformer area

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113452027A (en) * 2021-07-27 2021-09-28 山东鲁软数字科技有限公司智慧能源分公司 Energy scheduling system and method for low-voltage flexible direct power distribution transformer area

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