CN112421751A - Emergency power distribution system and method based on mobile energy storage - Google Patents
Emergency power distribution system and method based on mobile energy storage Download PDFInfo
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- CN112421751A CN112421751A CN202010920893.7A CN202010920893A CN112421751A CN 112421751 A CN112421751 A CN 112421751A CN 202010920893 A CN202010920893 A CN 202010920893A CN 112421751 A CN112421751 A CN 112421751A
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/248—UPS systems or standby or emergency generators
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Abstract
The invention discloses an emergency power distribution system based on mobile energy storage, which at least comprises a management center, a mobile energy storage device, at least one alternating current medium-voltage power distribution network and at least one alternating current low-voltage local power grid, wherein the alternating current medium-voltage power distribution network and the alternating current low-voltage local power grid are connected between the management center and the mobile energy storage device; wherein: the management center is used for monitoring basic information and working states of the alternating-current medium-voltage power distribution network, the alternating-current low-voltage local power grid and the mobile energy storage device, and recommending the source power distribution network and the mobile energy storage device which are closest to each other around the local power grid with the power supply gap in emergency power distribution service. The invention also discloses a corresponding method. By implementing the invention, emergency power distribution treatment can be carried out in a mobile energy storage mode, the coping efficiency of fault power failure can be improved, and balance between surplus power consumption and power supply gap supplement is realized.
Description
Technical Field
The invention belongs to the technical field of power distribution of power supply networks, and particularly relates to an emergency power distribution system and method based on mobile energy storage.
Background
Along with the improvement of the living standard of people, the dependence degree on electric energy is gradually improved, and the requirement on the reliability of power supply is particularly obviously improved day by day. The fault power failure is one of the main emergency situations which troubles power consumers and power distribution network operation and maintenance personnel. At present, the main solution to this is to configure an emergency generator car or an emergency power supply. The devices use the fuel oil generator as a core power source, which not only pollutes the environment, but also has relatively low efficiency. On the other hand, the output of the emergency generator or the generator car is alternating current, and with the development of distributed energy and the development of micro-grid technology, a direct current power distribution network or an alternating current-direct current hybrid power distribution network starts to be widely tested and applied, and the surplus power consumption and the power supply gap supplement of the direct current power distribution network or the alternating current-direct current hybrid power distribution network exceed the functional scope of traditional emergency power supply equipment.
Disclosure of Invention
The invention aims to solve the technical problem that the invention provides an emergency power distribution system and method based on mobile energy storage, which can carry out emergency power distribution treatment in a mobile energy storage mode and can improve the coping efficiency of fault power failure.
In order to solve the technical problems, one aspect of the present invention provides an emergency power distribution system based on mobile energy storage, which at least includes a management center, a mobile energy storage device, and at least one ac medium voltage power distribution network and an ac low voltage local area power network connected therebetween; wherein:
the management center is used for monitoring basic information and working states of the alternating-current medium-voltage power distribution network, the alternating-current low-voltage local power grid and the mobile energy storage device, and recommending a source power distribution network and the mobile energy storage device which are closest to each other around the local power grid with a power supply gap in emergency power distribution service;
the system comprises an alternating current medium-voltage distribution network, a first power distribution network management module, a superior power supply, an alternating current medium-voltage distribution line/network, a medium-voltage alternating current charging port, a second communication module, a medium-voltage/low-voltage transformer and a low-voltage alternating current charging port, wherein the alternating current medium-voltage distribution network is used for realizing alternating current medium-voltage distribution;
the mobile energy storage device is used for realizing mobile energy storage for a local area power grid with a power supply gap according to the control of a management center in emergency power distribution service, and comprises an energy storage module, a power conversion module, an alternating current charging/discharging port, a navigation module, a mobile module, a third communication module and a direct current charging/discharging port;
the alternating-current low-voltage local area power grid is used for realizing alternating-current low-voltage power distribution; the system comprises a first local area power grid management module, a fourth communication module, a local power supply, a load, an alternating current low-voltage line/network and a low-voltage alternating current discharge port, wherein the alternating current low-voltage line/network comprises a medium-voltage/low-voltage transformer and a medium-voltage alternating current discharge port.
Wherein, further include at least one direct current distribution network and direct current local area network, wherein:
the direct-current power distribution network is used for realizing direct-current power distribution and comprises a second power distribution network management module, a superior power supply, a direct-current distribution line/network, a direct-current charging port and a fifth communication module;
the direct-current local area power grid mainly comprises a second local area power grid management module, a local power supply, a load, a direct-current line/network, a direct-current discharge port and a sixth communication module.
The management center comprises a man-machine interaction module, a source power distribution network information module, a mobile energy storage device management module, a local power grid information module, a geographic information module, an information storage module and a first communication module; wherein:
the man-machine interaction module is used for providing an operation interface for management personnel of an emergency power distribution system management center;
the source power distribution network information module is used for collecting and managing the online state, the load rate, the output charging power, the basic information of a charging port and the occupation condition information of each source power distribution network, and the source power distribution networks comprise the alternating current medium voltage power distribution network and the direct current power distribution network;
the mobile energy storage device management module is used for collecting and managing basic information, an online state, an energy storage state and implementation geographic position information of each mobile energy storage device, wherein the basic information of the mobile energy storage device comprises: energy storage capacity, alternating current and direct current charging and discharging power, the number of charging and discharging ports, mobility and the overall dimension of the device;
the local power grid information module is used for collecting and managing the on-line state, power supply gap, discharge port basic information and occupation condition information of each local power grid; wherein, the local area power grid includes: an alternating current low-voltage local area power grid and a direct current local area power grid;
the geographic information module is used for managing, collecting and managing geographic information of each source power distribution network, each local power grid and the mobile energy storage device; the system is used for being responsible for recommending a source power distribution network and a mobile energy storage device which are closest to a local power grid with a power supply gap in emergency power distribution service;
the information storage module is used for storing the information required to be stored in the operation process of the management center;
the first communication module is used for communication between the management center and the alternating current medium voltage distribution network, the direct current distribution network, the alternating current low voltage local area power grid, the direct current local area power grid and the mobile energy storage device.
In the alternating-current medium-voltage power distribution network, the power distribution network management module is used for collecting and analyzing load rate information of each main device of the alternating-current medium-voltage power distribution network, collecting the occupied condition of a charging port, and giving the charging port condition and the charging capacity which can be provided by the power distribution network through comprehensive analysis;
the upper-level power supply is used for providing electric energy for a source power distribution network, and is one of a medium-voltage bus of a transformer substation, a medium-voltage distribution network facility, a power plant or a medium-voltage grid-connected point of a distributed power supply;
the system comprises an alternating-current medium-voltage distribution line/network, a power supply and a power distribution system, wherein the alternating-current medium-voltage distribution line/network is used for power transmission and distribution, is in the form of an overhead line or a cable and the like, and is connected with the line or the network through an intermediate connector, a breaker and a disconnecting link;
the medium-voltage alternating current charging port is used for charging the mobile energy storage device;
the second communication module is used for communication between the alternating-current medium-voltage distribution network and the management center.
The medium/low voltage transformer is used for converting medium voltage power into low voltage power;
the low-voltage alternating current charging port is used for charging the mobile energy storage device.
In the mobile energy storage device, the energy storage module is used for storing energy, one of various electricity storage devices such as lithium batteries and the like, superconducting magnetic energy storage, flywheel energy storage, molten mass and compressed air energy storage is adopted, and a port of the energy storage module supports input and output of electric power;
the power conversion module is used for converting the electric energy acquired from the charging port into an electric power form required by the energy storage module and transmitting the electric power form to the energy storage module; converting the electric energy output by the energy storage module into an electric power form which needs to be output by a discharge port;
the alternating current charging/discharging port is used for the mobile energy storage device to take electricity from an alternating current source power distribution network and discharge electricity to an alternating current local area network;
the navigation module is used for guiding the mobile energy storage device to reach a charging port of a source power distribution network or a discharging port of a local power grid appointed by the management center from a departure place;
the mobile module is used for moving the energy storage device and adopts the bearing modes of various vehicles in the road, sea and air;
the third communication module is used for communication between the mobile energy storage device and the management center;
dc charge/discharge port: the mobile energy storage device is used for taking electricity from a direct-current source power distribution network and discharging electricity to a direct-current local power grid.
In the alternating-current low-voltage local area power grid, the local area power grid management module is used for collecting and analyzing the output condition and the load level of each local power supply of the alternating-current low-voltage local area power grid, the load rates of an alternating-current low-voltage line/network and a medium-voltage/low-voltage transformer, collecting the occupied condition of a discharge port, and giving the requirements of the local area power grid on the discharge service of the mobile energy storage device and the conditions of the discharge port which can be provided through comprehensive analysis;
the local power supply is used for supplying power to a local power grid and is in the form of a distributed power supply, a local energy storage device or V2G;
the alternating-current low-voltage line/network is used for power transmission and distribution, is in the form of an overhead line or a cable, and is connected with the line or the network through an intermediate joint, a breaker and a disconnecting link;
the low-voltage alternating current discharge port is used for supplying power to the local power grid by the mobile energy storage device;
the fourth communication module is used for communication between the alternating-current low-voltage local area power grid and the management center;
medium/low voltage transformer: for converting medium voltage power to low voltage power.
The medium-voltage alternating current discharge port is used for moving the energy storage device to supply power to the local power grid.
In the direct-current power distribution network, the power distribution network management module is used for acquiring and analyzing load rate information of each main device of the direct-current power distribution network, acquiring occupied conditions of direct-current charging ports, and giving charging port conditions and charging capacity which can be provided by the local power distribution network through comprehensive analysis;
the upper-level power supply is used for providing electric energy for a source power distribution network and is at least one of a rectifier type power transformation facility bus bar, a direct-current power plant or a grid-connected point of a direct-current distributed power supply;
the direct current distribution line/network is used for taking charge of power transmission and distribution, is in the form of an overhead line or a cable, and is connected with each other through an intermediate joint, a breaker and a disconnecting link;
the direct current charging port is used for charging the mobile energy storage device;
and the fifth communication module is used for communication between the direct current distribution network and the management center.
In the direct-current local area power grid, the local area power grid management module is used for collecting and analyzing the output condition, the load level and the direct-current line/network load rate of each local power supply of the direct-current local area power grid, collecting the occupied condition of a direct-current discharge port, and giving the requirement of the local area power grid on the discharge service of the mobile energy storage device and the condition of the discharge port which can be provided through comprehensive analysis;
the local power supply is used for supplying power to a local power grid and can be in the form of various distributed power supplies, local energy storage equipment and V2G;
the direct current line/network is used for taking charge of power transmission and distribution, is in the form of an overhead line or a cable, and is connected with the line or the network through an intermediate joint, a breaker and a disconnecting link;
the direct current discharging port is used for supplying power to the local power grid by the mobile energy storage device;
and the sixth communication module is used for communication between the direct current local area power grid and the management center.
Correspondingly, in another aspect of the present invention, there is also provided an emergency power distribution method based on mobile energy storage, which is applied in any one of the foregoing systems, and includes the following steps:
step S10: the first local area power grid management module or the second local area power grid management module of the local area power grid discovers that a power supply gap is expected to occur when the local area power grid load value is larger than the maximum output of a local power supply in a certain period of time in the future through comprehensive analysis;
step S11: the local area power grid management module of the local area power grid gives a time period and capacity of service which needs to be provided by the mobile energy storage device through measurement and calculation, and provides a discharge port which can be accessed by the mobile energy storage device, wherein the discharge port comprises an alternating current low-voltage discharge port, a medium-voltage discharge port or a direct current discharge port;
step S12: the local area power grid submits service requirements and position and model information of an available discharge port to a management center through a communication module of the local area power grid;
step S13: the management center optimizes the on-line mobile energy storage device and the source power distribution network from space, time and schedulable capacity dimensions according to service requirements and discharge port information provided by the local power grid to form a service combination;
step S14: the management center sends a service scheme to the corresponding mobile energy storage device and the source power distribution network, wherein the service scheme comprises the service time period and the access port position of the mobile energy storage device; the service time interval, the required capacity and the required port information of the source power distribution network;
step S15: in the service period, the mobile energy storage device selected by the management center provides power supply service for the local area power grid, and the selected source power distribution network provides charging support for the mobile energy storage device.
In step S13, the following priority rule is adopted:
space factor: the real-time position of the online mobile energy storage and the source power distribution network, which are close to the local area power grid in geographic position and convenient for traffic, are taken into consideration preferentially;
time factor: mobile energy storage devices and source power distribution networks of other service plans are not considered in the service demand period;
capacity of schedulable: the capacity of a single device can meet the service requirement of the mobile energy storage device and is considered preferentially; if the discharge power of a single device can not meet the requirement, a high-power device is preferentially selected; on the basis, if the real-time energy storage of the mobile energy storage device cannot meet the service requirement, a combined power supply scheme of the mobile energy storage device and a source power distribution network is adopted in the service time interval, the mobile energy storage device participates in power supply service in batches, and the source power distribution network provides charging support for the mobile energy storage device;
after the mobile energy storage device provides service, the mobile energy storage device enters an offline state in principle, and after the mobile energy storage device is fully charged, the mobile energy storage device is online again and is subjected to dispatching of a management center;
wherein, the priority of the space factor is higher than that of the schedulable capacity, and the time factor is that the condition must be satisfied.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an emergency power distribution system and method based on mobile energy storage. And monitoring the basic information and the working state of each device through the management center, and recommending a source power distribution network and a mobile energy storage device which are closest to each other around a local power grid with a power gap in the emergency power distribution service. Can carry out emergent power distribution through removing the mode of energy storage and handle, can improve the efficiency of answering of trouble power failure. Meanwhile, balance between surplus power consumption and power supply gap supplement is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for a person skilled in the art to obtain other drawings based on the drawings without paying creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an emergency power distribution system based on mobile energy storage provided by the present invention;
FIG. 2 is a schematic diagram of the management center of FIG. 1;
fig. 3 is a schematic structural diagram of the ac medium voltage distribution network of fig. 1;
FIG. 4 is a schematic structural diagram of the mobile energy storage device in FIG. 1;
FIG. 5 is a schematic diagram of the AC low-voltage local power grid of FIG. 1;
fig. 6 is a schematic structural diagram of the dc distribution network in fig. 1;
FIG. 7 is a schematic structural diagram of the DC local power grid of FIG. 1;
fig. 8 is a schematic main flow chart of an emergency power distribution method based on mobile energy storage according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Specifically, as shown in fig. 1, a schematic structural diagram of an embodiment of an emergency power distribution system based on mobile energy storage according to the present invention is shown; referring to fig. 2 to 8 together, in this embodiment, the system at least includes: the system comprises a management center 1, a mobile energy storage device 4, at least one alternating current medium voltage distribution network 2 and an alternating current low voltage local area network 5 which are connected between the management center and the mobile energy storage device; in some embodiments, further comprising at least one dc distribution grid 3 and a dc local grid 6 connected between the management center 1 and the mobile energy storage device 4.
In the following, the source distribution network referred to therein is an ac medium voltage distribution network 2 and a dc distribution network 3 providing charging power for the mobile energy storage device 4. The local power grid refers to a power distribution network which is always or temporarily isolated from the operation of a large power grid. The distribution line/network in the source distribution network related by the invention already contains loads, so that the distribution line/network load rate value collected and analyzed by the distribution network management module is the ratio of the load value to the rated capacity (or thermal stability capacity) of the distribution line/network.
Specifically, in the present invention, a plurality of management centers 1 may be provided, where a management center is an information center and a resource scheduling center of the present invention, and is configured to monitor basic information and operating states of the ac medium voltage distribution network 2, the ac low voltage local area network 5, the dc distribution network 3, the dc local area network 6, and the mobile energy storage device 4, and recommend a source distribution network and the mobile energy storage device 4 that are closest to each other around a local area network in which a power gap occurs in an emergency distribution service. The specific structural schematic diagram is shown in fig. 2, and the system comprises a human-computer interaction module 10, a source distribution network information module 11, a mobile energy storage device management module 12, a local area power grid information module 13, a geographic information module 14, an information storage module 15, and a first communication module 16.
In a specific example, the human-computer interaction module 10 may include a display, a mouse, a keyboard, a headset, etc., and functions to provide an operation interface for emergency power distribution system management center management personnel;
the source distribution network information module 11 is used for collecting and managing information such as an online state (including whether a communication network is unobstructed and whether the source distribution network can respond to scheduling of a management center), a load rate, an output charging power, basic information (rated voltage, maximum charging power and the like) of charging ports (namely, an alternating current charging port and a direct current charging port), an occupation situation and the like of each source distribution network (namely, an alternating current medium voltage distribution network and a direct current distribution network);
the mobile energy storage device management module 12 is used for collecting and managing basic information (including but not limited to energy storage capacity (actual value checked regularly, and energy storage capacity decreases with the increase of service life), ac/dc charging/discharging power, the number of charging/discharging ports, mobility (including requirements for road surface, driving speed, maximum driving mileage, etc.), overall dimensions of the device), online state (including whether a communication network is unobstructed and whether the mobile energy storage device can respond to the scheduling of a management center), energy storage state (how much electric quantity has been stored and how much electric quantity can be stored again), implementation geographical location information, etc. of each mobile energy storage device.
The local area power grid information module 13 is used for collecting and managing information such as an online state (including whether a communication network is smooth and whether the communication network can respond to scheduling of a management center) of each local area power grid (i.e., an alternating-current low-voltage local area power grid and a direct-current local area power grid), a power supply gap (the power supply gap means that a power supply of the local area power grid does not support real-time power consumption requirements and has a difference, namely, the power supply gap is real-time power load-capacity of the local area power grid, and when the power supply gap value is greater than zero, the emergency power distribution service is started, basic information (rated voltage, maximum discharge power and the like) of a discharge port (i.e., an alternating-current charging port and a direct-current charging port;
the geographic information module 14 is used for managing and acquiring and managing geographic information of each source power distribution network (especially a charging port thereof), each local power grid (especially a discharging port thereof) and the mobile energy storage device; the emergency power distribution system is responsible for recommending a source power distribution network and a mobile energy storage device which are closest to a local power grid with a power gap in emergency power distribution service.
The information storage module 15 is used for storing information to be stored in the operation process of the management center, and specifically, the information storage module can be implemented by using a hard disk, an optical disk, a usb disk or a network disk;
the first communication module can support wireless communication (3G/4G communication, and can selectively support 5G) and wired communication (optical fibers, network cables, carrier waves and the like), and is used for communication between a management center and an alternating current medium voltage distribution network, a direct current distribution network, an alternating current low voltage local area network, a direct current local area network (a wired mode is a main mode, a wireless mode is an auxiliary mode) and a mobile energy storage device (a wireless mode);
it is to be understood that a plurality of the above modules may be provided in the management center 1.
And the alternating-current medium-voltage distribution network 2 is used for realizing alternating-current medium-voltage distribution. The specific structure of the power distribution network management system is shown in fig. 3, and the power distribution network management system mainly comprises a first power distribution network management module, a superior power supply, an alternating-current medium-voltage distribution line/network, a medium-voltage alternating-current charging port and a second communication module, wherein the second communication module can comprise a medium-voltage/low-voltage transformer and a low-voltage alternating-current charging port.
More specifically, in a specific embodiment, the first distribution network management module is configured to be responsible for collecting and analyzing load rate information of each main device (including a higher-level power supply, an ac medium-voltage distribution line/network, a medium-voltage/low-voltage transformer (if any), and the like) of the ac medium-voltage distribution network, collecting occupied situations of charging ports (including a medium-voltage ac charging port and a low-voltage ac charging port (if any)), and giving a charging port situation that can be provided by the local distribution network and a charging capacity that can be provided through comprehensive analysis;
the superior power supply is responsible for providing electric energy for a source distribution network, and can be a medium-voltage bus of a transformer substation, medium-voltage distribution network facilities (such as a switching station, a ring main unit and the like), a power plant or a medium-voltage grid connection point of a distributed power supply and the like.
The ac medium voltage distribution lines/networks are responsible for power transmission and distribution and may be in the form of overhead lines or cables, with the lines or networks being connected by intermediate connectors, circuit breakers, disconnectors, etc.
The medium-voltage alternating-current charging port is used for charging the mobile energy storage device, the charging port/discharging port related to the invention is designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adaptive.
The second communication module can support wired communication (optical fiber, network cable, carrier wave and the like) and wireless communication (3G/4G communication, optionally 5G communication) and is used for communication between the medium voltage distribution network and the management center (the wired mode is main, and the wireless mode is auxiliary).
Medium/low voltage transformers are used to convert medium voltage power to low voltage power.
The low-voltage alternating current charging port is used for charging the mobile energy storage device, the charging port/discharging port related to the embodiment of the invention is designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adaptive.
It will be appreciated that in the ac medium voltage distribution network 2, there may be a plurality of modules or devices.
As shown in fig. 4, the mobile energy storage device 4 is mainly used for implementing mobile energy storage for a local area power grid with a power gap according to the control of a management center in emergency power distribution service; the system mainly comprises an energy storage module 40, a power conversion module 41, an alternating current charging/discharging port 42, a navigation module 44, a mobile module 45, a third communication module 46, and a direct current charging/discharging port 43.
Specifically, in practical examples, the energy storage module 40 is used for storing energy, and may be various types of energy storage devices such as lithium batteries, and may also be superconducting magnetic energy storage, flywheel energy storage, molten mass, compressed air energy storage, and the like, and the ports of the module support input and output of electric power (i.e., if conversion of electric energy with other types of energy is involved, the required accessories are all included in the module).
The power conversion module 41 is used for converting the electric energy obtained from the charging port into an electric power form required by the energy storage module and transmitting the electric power form to the energy storage module; and converting the electric energy output by the energy storage module into an electric power form which needs to be output by the discharge port. The power conversion device may be built based on elements such as MOS transistors and IGBTs, and may be an aggregate of bidirectional conversion circuits or unidirectional conversion circuits.
The ac charging/discharging port 42 is used for the mobile energy storage device to take electricity from the ac source distribution network and discharge electricity to the ac local area network. The charging port/the discharging port related to the invention are designed according to a unified standard, and the charging port and the discharging port (comprising a charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage level and the same attribute (alternating current or direct current) can be adapted.
The navigation module 44 is used to guide the mobile energy storage device from the departure point to a charging port of the source distribution network or a discharging port of the local area network designated by the management center. Specifically, the mobile phone type or the PDA can be adopted, and the functions of GPS (or beidou) positioning, destination selection, path calculation, and path guidance should be provided.
The moving module 45 is used for moving the energy storage device, and can adopt the carrying modes of various vehicles such as roads, seas and aircrafts.
The third communication module 46 may support wireless communication (3G/4G communication, optionally 5G communication) for communication between the mobile energy storage device and the management center;
the dc charging/discharging port 43 is used for the mobile energy storage device to take electricity from the dc source distribution network and discharge electricity to the dc local grid. The charging port/the discharging port related to the invention are designed according to a unified standard, and the charging port and the discharging port (comprising a charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage level and the same attribute (alternating current or direct current) can be adapted.
It is understood that in the mobile energy storage device 4, there may be a plurality of the above modules or devices.
As shown in fig. 5, the ac low-voltage local area network 5 is used to implement ac low-voltage power distribution; the system mainly comprises a first local area power grid management module, a fourth communication module, a local power supply, a load, an alternating-current low-voltage line/network and a low-voltage alternating-current discharge port, and can comprise a medium-voltage/low-voltage transformer, a medium-voltage alternating-current discharge port and the like.
Specifically, in some examples, the first local power grid management module is configured to collect and analyze a power output condition, a load level, a load rate of the ac low-voltage line/network and the medium-voltage/low-voltage transformer (if any), an occupied condition of a discharge port (including a low-voltage ac discharge port and a medium-voltage ac discharge port (if any)), and give a demand (including information such as start-stop time and power) of the local power grid for a discharge service of the mobile energy storage device and a discharge port condition that can be provided through comprehensive analysis;
the local power supply is responsible for providing power for the local power grid, and may be in the form of various types of distributed power supplies, energy storage (localized devices, different from the mobile energy storage device of the present invention), V2G, and the like.
The load is an object that provides power supply service to the local power grid.
The ac low-voltage lines/networks are used for power transmission and distribution, and may be in the form of overhead lines or cables, and the lines or networks are connected by intermediate connectors, circuit breakers, disconnecting links, and the like.
The low-voltage alternating current discharging port is used for supplying power to a local power grid by the mobile energy storage device, the charging port/discharging port related to the invention is designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adaptive.
The fourth communication module can support wired communication (optical fiber, network cable, carrier wave and the like) and wireless communication (3G/4G communication, optionally 5G communication) and is used for communication between the alternating-current low-voltage local area power grid and a management center (a wired mode is a main mode, and a wireless mode is an auxiliary mode).
Medium/low voltage transformers are used to convert medium voltage power to low voltage power.
The medium-voltage alternating current discharging port is used for supplying power to a local power grid by the mobile energy storage device, the charging port/discharging port related to the invention is designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adaptive.
It is understood that in the ac low voltage local area network 5, there may be a plurality of the above modules or devices.
As shown in fig. 6, the dc distribution network 3 is used to realize dc distribution. The system comprises a second power distribution network management module, a superior power supply, a direct-current distribution line/network, a direct-current charging port and a fifth communication module.
In a specific example, the second power distribution network management module is used for collecting and analyzing load rate information of each main device (including a higher-level power supply, a direct-current distribution line/network and the like) of the direct-current power distribution network, collecting an occupied condition of a direct-current charging port, and giving a charging port condition and charging capacity which can be provided by the local power distribution network through comprehensive analysis;
the upper-level power supply is used for providing electric energy for a source power distribution network, and can be a bus bar of a rectifier type (alternating current to direct current) power transformation facility, a direct current type power plant or a grid connection point of a direct current type distributed power supply and the like.
The dc distribution lines/networks are responsible for power transmission and distribution, and may be in the form of overhead lines or cables, and the lines or networks are connected by intermediate connectors, circuit breakers, disconnecting switches, and the like.
The charging port/discharging port related to the invention is designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adapted.
The fifth communication module can support wired communication (optical fiber, network cable, carrier wave and the like) and wireless communication (3G/4G communication, optionally 5G communication) and is used for communication between the direct current power distribution network and the management center (the wired mode is main, and the wireless mode is auxiliary).
It is to be understood that in the dc distribution network 3, there may be a plurality of the above modules or devices.
As shown in fig. 7, the dc local area network 6 mainly includes a second local area network management module, a local power supply, a load, a dc line/network, a dc discharge port, and a sixth communication module.
The second local area power grid management module is used for collecting and analyzing the output condition, the load level and the direct current line/network load rate of each local power supply of the direct current local area power grid, collecting the occupied condition of a direct current discharge port, and giving the requirements (including information such as start-stop time, power and the like) of the local area power grid on the discharge service of the mobile energy storage device and the conditions of the discharge port capable of being provided through comprehensive analysis;
the local power supply is responsible for providing power for the local power grid, and may be in the form of various types of distributed power supplies, energy storage (localized devices, different from the mobile energy storage device of the present invention), V2G, and the like.
The load is an object that provides power supply service to the local power grid.
The dc lines/networks are used for power transmission and distribution, and may be in the form of overhead lines or cables, and the lines or networks are connected by intermediate connectors, circuit breakers, disconnecting links, and the like.
The charging port/the discharging port related to the invention are designed according to a unified standard, and the charging port and the discharging port (including the charging/discharging dual-purpose port of the mobile energy storage device) with the same voltage grade and the same attribute (alternating current or direct current) can be adapted.
The sixth communication module can support wired communication (optical fiber, network cable, carrier wave, etc.) and wireless communication (3G/4G communication, optionally supporting 5G) and is used for communication between the direct current local area network and the management center (wired mode is main, wireless mode is auxiliary).
It is understood that in the dc local power grid 6, there may be a plurality of the above modules or devices.
Fig. 8 shows a main flow diagram of an embodiment of an emergency power distribution method based on mobile energy storage according to the present invention. In this embodiment, the method is implemented in the system described in the foregoing fig. 1 to fig. 7, and specifically, the method includes the following steps:
step S10: the local power grid management module of the local power grid A (including an alternating current low-voltage local power grid and a direct current local power grid (if any)) discovers that a power supply gap (the load value is larger than the maximum output of a local power supply) occurs in the local power grid in a certain period of time in the future through comprehensive analysis;
step S11: the local power grid management module of the local power grid A calculates and calculates a time period and capacity (namely service requirement) of service provided by the mobile energy storage device, and a discharge port (including an alternating current low-voltage discharge port, a medium-voltage discharge port (if any) or a direct current discharge port (if any)) which can be accessed by the mobile energy storage device;
step S12: the local area power grid A submits service requirements and available discharge port information (including positions, models and the like) to a management center through a self communication module;
step S13: and the management center optimizes the on-line mobile energy storage device and the source power distribution network from the dimensions of space, time and schedulable capacity according to the service requirement and the discharge port information provided by the local power grid A to form a service combination. Preferred principles include:
space factor: the geographical location is close to the service target (local network a in this case) and the online mobile energy storage (real-time location) and source distribution network are preferably taken into account.
Time factor: no other service plan mobile energy storage devices and source distribution grid are taken into account during service demand periods.
Capacity of schedulable: the capacity (including discharge power and real-time energy storage) of a single device can meet the service requirement of the mobile energy storage device; if the discharge power of a single device can not meet the requirement, a high-power device is preferentially selected; on the basis, if the real-time energy storage of the mobile energy storage device cannot meet the service requirement, a combined power supply scheme of the mobile energy storage device and the source power distribution network is adopted in the service time interval, the mobile energy storage device participates in power supply service in batches, and the source power distribution network provides charging support for the mobile energy storage device.
The mobile energy storage device enters an offline state in principle after providing service, and is online again after being fully charged and is dispatched by a management center.
Among the factors considered, the spatial factor has a priority greater than the schedulable capacity, and the temporal factor is the condition that must be satisfied.
Step S14: the management center sends the service plan to the corresponding mobile energy storage device (service period, access port position (including discharge port and charge port)) and the source power distribution network (service period, required capacity, required port, etc.).
Step S15: in the service period, the mobile energy storage device selected by the management center provides power supply service for a local area network (in this case, the local area network a), and the selected source distribution network (if any) provides charging support for the mobile energy storage device.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an emergency power distribution system and method based on mobile energy storage. And monitoring the basic information and the working state of each device through the management center, and recommending a source power distribution network and a mobile energy storage device which are closest to each other around a local power grid with a power gap in the emergency power distribution service. Can carry out emergent power distribution through removing the mode of energy storage and handle, can improve the efficiency of answering of trouble power failure. Meanwhile, balance between surplus power consumption and power supply gap supplement is achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An emergency power distribution system based on mobile energy storage is characterized by at least comprising a management center, a mobile energy storage device, at least one alternating current medium-voltage power distribution network and at least one alternating current low-voltage local power grid, wherein the alternating current medium-voltage power distribution network and the alternating current low-voltage local power grid are connected between the management center and the mobile energy storage device; wherein:
the management center is used for monitoring basic information and working states of the alternating-current medium-voltage power distribution network, the alternating-current low-voltage local power grid and the mobile energy storage device, and recommending a source power distribution network and the mobile energy storage device which are closest to each other around the local power grid with a power supply gap in emergency power distribution service;
the system comprises an alternating current medium-voltage distribution network, a first power distribution network management module, a superior power supply, an alternating current medium-voltage distribution line/network, a medium-voltage alternating current charging port, a second communication module, a medium-voltage/low-voltage transformer and a low-voltage alternating current charging port, wherein the alternating current medium-voltage distribution network is used for realizing alternating current medium-voltage distribution;
the mobile energy storage device is used for realizing mobile energy storage for a local area power grid with a power supply gap according to the control of a management center in emergency power distribution service, and comprises an energy storage module, a power conversion module, an alternating current charging/discharging port, a navigation module, a mobile module, a third communication module and a direct current charging/discharging port;
the alternating-current low-voltage local area power grid is used for realizing alternating-current low-voltage power distribution; the system comprises a first local area power grid management module, a fourth communication module, a local power supply, a load, an alternating current low-voltage line/network and a low-voltage alternating current discharge port, wherein the low-voltage alternating current discharge port comprises a medium-voltage/low-voltage transformer and a medium-voltage alternating current discharge port.
2. The system of claim 1, further comprising at least one dc distribution grid and a dc local grid connected between the management center and the mobile energy storage devices, wherein:
the direct-current power distribution network is used for realizing direct-current power distribution and comprises a second power distribution network management module, a superior power supply, a direct-current distribution line/network, a direct-current charging port and a fifth communication module;
the direct-current local area power grid mainly comprises a second local area power grid management module, a local power supply, a load, a direct-current line/network, a direct-current discharge port and a sixth communication module.
3. The system of claim 2, wherein the management center comprises a human-computer interaction module, a source distribution network information module, a mobile energy storage device management module, a local area network information module, a geographic information module, an information storage module and a first communication module; wherein:
the man-machine interaction module is used for providing an operation interface for management personnel of an emergency power distribution system management center;
the source power distribution network information module is used for collecting and managing the online state, the load rate, the output charging power, the basic information of a charging port and the occupation condition information of each source power distribution network, and the source power distribution networks comprise the alternating current medium voltage power distribution network and the direct current power distribution network;
the mobile energy storage device management module is used for collecting and managing basic information, an online state, an energy storage state and implementation geographic position information of each mobile energy storage device, wherein the basic information of the mobile energy storage device comprises: energy storage capacity, alternating current and direct current charging and discharging power, the number of charging and discharging ports, mobility and the overall dimension of the device;
the local power grid information module is used for collecting and managing the on-line state, the power gap, the discharge port basic information and the occupation condition information of each local power grid; wherein, the local area power grid includes: an alternating current low-voltage local area power grid and a direct current local area power grid;
the geographic information module is used for managing, collecting and managing geographic information of each source power distribution network, each local power grid and the mobile energy storage device; the system is used for being responsible for recommending a source power distribution network and a mobile energy storage device which are closest to a local power grid with a power supply gap in emergency power distribution service;
the information storage module is used for storing the information required to be stored in the operation process of the management center;
the first communication module is used for communication between the management center and the alternating current medium voltage distribution network, the direct current distribution network, the alternating current low voltage local area power grid, the direct current local area power grid and the mobile energy storage device.
4. The system of claim 3, wherein in the ac medium voltage distribution network, the distribution network management module is responsible for collecting and analyzing load rate information of each main device of the ac medium voltage distribution network, collecting occupied conditions of charging ports, and giving available charging port conditions and available charging capacity of the local distribution network through comprehensive analysis;
the upper-level power supply is used for providing electric energy for a source power distribution network and is one of a medium-voltage bus of a transformer substation, a medium-voltage power distribution network facility, a power plant or a medium-voltage grid-connected point of a distributed power supply;
the system comprises an alternating-current medium-voltage distribution line/network, a power supply and a power distribution system, wherein the alternating-current medium-voltage distribution line/network is used for power transmission and distribution, is in the form of an overhead line or a cable and the like, and is connected with the line or the network through an intermediate connector, a breaker and a disconnecting link;
the medium-voltage alternating current charging port is used for charging the mobile energy storage device;
the second communication module is used for communication between the alternating-current medium-voltage distribution network and the management center.
The medium/low voltage transformer is used for converting medium voltage power into low voltage power;
the low-voltage alternating current charging port is used for charging the mobile energy storage device.
5. The system of claim 4, wherein in the mobile energy storage device, the energy storage module is used for storing energy, and adopts one of various types of energy storage devices such as lithium batteries, superconducting magnetic energy storage, flywheel energy storage, molten mass and compressed air energy storage, and the port of the energy storage module supports input and output of electric power;
the power conversion module is used for converting the electric energy acquired from the charging port into an electric power form required by the energy storage module and transmitting the electric power form to the energy storage module; converting the electric energy output by the energy storage module into an electric power form which needs to be output by a discharge port;
the alternating current charging/discharging port is used for the mobile energy storage device to get electricity from an alternating current source power distribution network and discharge electricity to an alternating current local area power grid;
the navigation module is used for guiding the mobile energy storage device to reach a charging port of a source power distribution network or a discharging port of a local power grid appointed by the management center from a departure place;
the mobile module is used for moving the energy storage device and adopts the bearing modes of various vehicles in the road, sea and air;
the third communication module is used for communication between the mobile energy storage device and the management center;
dc charge/discharge port: the mobile energy storage device is used for taking electricity from a direct current source power distribution network and discharging electricity to a direct current local power grid.
6. The system of claim 5, wherein in the ac low voltage local power grid, the local power grid management module is configured to collect and analyze a power output condition, a load level, a load rate of the ac low voltage line/network and the medium/low voltage transformer of the ac low voltage local power grid, collect an occupied condition of the discharge port, and give a demand of the local power grid for a discharge service of the mobile energy storage device and a condition of the discharge port available through comprehensive analysis;
the local power supply is used for supplying power to a local power grid and is in the form of a distributed power supply, a local energy storage device or V2G;
the alternating-current low-voltage line/network is used for power transmission and distribution, is in the form of an overhead line or a cable, and is connected with the line or the network through an intermediate joint, a breaker and a disconnecting link;
the low-voltage alternating current discharge port is used for supplying power to the local power grid by the mobile energy storage device;
the fourth communication module is used for communication between the alternating-current low-voltage local area power grid and the management center;
medium/low voltage transformer: for converting medium voltage power to low voltage power.
The medium-voltage alternating current discharge port is used for moving the energy storage device to supply power to the local power grid.
7. The system of claim 6, wherein in the dc distribution network, the distribution network management module is configured to collect and analyze load rate information of each main device in the dc distribution network, collect occupied conditions of the dc charging ports, and give conditions of the charging ports available and charging capacity available in the local distribution network through comprehensive analysis;
the upper-level power supply is used for providing electric energy for a source power distribution network and is at least one of a bus bar of a rectification type power transformation facility, a direct-current power plant or a grid-connected point of a direct-current distributed power supply;
the direct current distribution line/network is used for taking charge of power transmission and distribution, is in the form of an overhead line or a cable, and is connected with the lines or the network through an intermediate joint, a breaker and a disconnecting link;
the direct current charging port is used for charging the mobile energy storage device;
and the fifth communication module is used for communication between the direct current distribution network and the management center.
8. The system of claim 7, wherein in the dc local power grid, the local power grid management module is configured to collect and analyze a power output condition, a load level, a dc line/network load rate of each local power source of the dc local power grid, collect an occupied condition of the dc discharge port, give a demand of the local power grid for discharging service of the mobile energy storage device through comprehensive analysis, and provide a condition of the discharge port;
the local power supply is used for supplying power to a local power grid and can be in the form of various distributed power supplies, local energy storage equipment and V2G;
the direct current line/network is used for taking charge of power transmission and distribution, is in the form of an overhead line or a cable, and is connected with the line or the network through an intermediate joint, a breaker and a disconnecting link;
the direct current discharging port is used for supplying power to the local power grid by the mobile energy storage device;
and the sixth communication module is used for communication between the direct current local area power grid and the management center.
9. An emergency power distribution method based on mobile energy storage, which is applied to the system according to any one of claims 1-8, and is characterized by comprising the following steps:
step S10: the first local area power grid management module or the second local area power grid management module of the local area power grid discovers that a power supply gap is expected to occur when the local area power grid load value is larger than the maximum output of a local power supply in a certain period of time in the future through comprehensive analysis;
step S11: the local area power grid management module of the local area power grid gives a time period and capacity of service which needs to be provided by the mobile energy storage device through measurement and calculation, and provides a discharge port which can be accessed by the mobile energy storage device, wherein the discharge port comprises an alternating current low-voltage discharge port, a medium-voltage discharge port or a direct current discharge port;
step S12: the local area power grid submits service requirements and available discharge port position and model information to a management center through a communication module of the local area power grid;
step S13: the management center optimizes the on-line mobile energy storage device and the source power distribution network from space, time and schedulable capacity dimensions according to service requirements and discharge port information provided by the local power grid to form a service combination;
step S14: the management center sends a service scheme to the corresponding mobile energy storage device and the source power distribution network, wherein the service scheme comprises the service time period and the access port position of the mobile energy storage device; the service time interval, the required capacity and the required port information of the source power distribution network;
step S15: in the service period, the mobile energy storage device selected by the management center provides power supply service for the local area power grid, and the selected source power distribution network provides charging support for the mobile energy storage device.
10. The method according to claim 9, wherein in the step S13, the following priority principle is adopted:
space factor: the real-time position of online mobile energy storage and a source power distribution network, the geographic position of which is close to a local power grid and the traffic of which is convenient, are taken into consideration preferentially;
time factor: mobile energy storage devices and source power distribution networks of other service plans are not considered in the service demand period;
capacity of schedulable: the capacity of a single device can meet the service requirement of the mobile energy storage device and is preferably considered; if the discharge power of a single device can not meet the requirement, a high-power device is preferentially selected; on the basis, if the real-time energy storage of the mobile energy storage device cannot meet the service requirement, a combined power supply scheme of the mobile energy storage device and a source power distribution network is adopted in the service time interval, the mobile energy storage device participates in power supply service in batches, and the source power distribution network provides charging support for the mobile energy storage device;
after the mobile energy storage device provides service, the mobile energy storage device enters an offline state in principle, and after the mobile energy storage device is fully charged, the mobile energy storage device is online again and is dispatched by a management center;
wherein, the priority of the space factor is higher than that of the schedulable capacity, and the time factor is that the condition must be satisfied.
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