CN116231733A - Device capable of realizing rapid energy interconnection among multiple micro-grids - Google Patents

Device capable of realizing rapid energy interconnection among multiple micro-grids Download PDF

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Publication number
CN116231733A
CN116231733A CN202310047950.9A CN202310047950A CN116231733A CN 116231733 A CN116231733 A CN 116231733A CN 202310047950 A CN202310047950 A CN 202310047950A CN 116231733 A CN116231733 A CN 116231733A
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CN
China
Prior art keywords
direct current
converter
power
battery
photovoltaic
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Pending
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CN202310047950.9A
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Chinese (zh)
Inventor
关学忠
温富光
刘嘉
陈凯龙
欧阳逸风
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Nanjing SAC Automation Co Ltd
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Nanjing SAC Automation Co Ltd
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Priority to CN202310047950.9A priority Critical patent/CN116231733A/en
Publication of CN116231733A publication Critical patent/CN116231733A/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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Photovoltaic Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a device capable of realizing rapid energy interconnection among a plurality of micro-grids, which can effectively integrate micro-grid systems constructed by wind power, hydropower, energy storage, photovoltaic and other distributed energy sources together, and can rapidly realize rapid interconnection of an information layer and an electric physical layer with other micro-grid devices through a coordination controller and a direct current expansion interface. So as to realize flexible conversion between different voltage classes, and active control functions of energy multidirectional flow and power flow.

Description

Device capable of realizing rapid energy interconnection among multiple micro-grids
Technical Field
The invention belongs to the technical field of micro-grids, and particularly relates to a device capable of realizing rapid energy interconnection among a plurality of micro-grids.
Background
Clean energy sources such as wind power, hydropower, energy storage, photovoltaics and the like gradually replace fossil energy sources to become new supply energy sources. However, a micro-grid system constructed by wind power, hydropower, energy storage, photovoltaic and other distributed energy sources often has the characteristics of geographic dispersibility, energy intermittence, voltage class diversity and the like.
In addition, although the micro-grid is usually not large in scale, the micro-grid is composed of primary devices such as various distributed power sources, loads, switches and power conversion and secondary control devices such as an energy management system, a control device and a battery management system.
The micro-grid operation principle is complex again, the multi-aspect contents such as a power supply networking mode, an operation state (steady state, dynamic state and transient state), mode switching, a control system architecture, a control strategy and the like are needed to be considered, and after the project is built, operation and maintenance are troublesome, and reconstruction and expansion are very difficult.
The device in the current market cannot meet the requirements of fast networking with other micro-grid devices while inputting various distributed power supplies and supplying various power loads in the micro-grid, and achieves the fast interconnection of a device information layer and an electrical physical layer, and the active control functions of energy multidirectional flow and power flow.
Disclosure of Invention
The invention provides a device capable of realizing rapid energy interconnection among a plurality of micro-grids, which can rapidly form a network with other micro-grid devices while meeting the requirements of various distributed power inputs and power supply for various power loads in the micro-grids, and can realize rapid interconnection of a device information layer and an electrical physical layer, and the active control function of energy multidirectional flow and power flow.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides a device capable of realizing rapid energy interconnection among a plurality of micro-grids, which comprises:
the input end of the photovoltaic direct current-direct current converter is connected with the photovoltaic module through the connector and used for tracking and controlling the maximum power of the photovoltaic module, and the output end of the photovoltaic direct current-direct current converter is connected with the direct current bus through the connector and used for providing power support for the direct current bus.
The input end of the battery direct current-direct current converter is connected with the energy storage battery through the direct current relay, the output end of the battery direct current-direct current converter is connected with the direct current bus through the connector, and the battery direct current-direct current converter is used for realizing the bidirectional flow of power between the battery and the direct current bus and can also provide voltage support for the direct current bus.
The input end of the direct current-alternating current converter is connected with the direct current bus through the contactor. The output end is connected with the power grid through a relay and is used for realizing bidirectional flow of power between the direct current bus and the alternating current power grid.
And the coordination controller is communicated with the energy management system through the Ethernet and receives control commands and data values of the energy management system. The CAN network is connected with the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter, and the rapid networking, the energy flow direction and the power active control function of the device are realized by setting the working mode and the running state of the converters.
Further, the coordination controller is used for controlling the closing and breaking of the direct current expansion interface contactor, communicating with the energy management system, receiving the operation strategy and the data value given by the energy management system, and setting the operation modes, the power flow directions and the output power of the photovoltaic direct current-direct current converter, the battery direct current-direct current converter and the direct current-alternating current converter in the device according to the operation strategy.
The photovoltaic direct current-direct current converter works in a maximum power tracking control mode, can detect the power generation power of the photovoltaic module in real time, and tracks the maximum power point of the photovoltaic module, so that the system outputs the maximum power.
The battery direct current-direct current converter works in constant voltage current limiting, constant current voltage limiting and constant power charging and discharging modes and is used for realizing direct current bus voltage support or direct current bus power support and battery charging and discharging and maintenance functions in real time according to the command switching mode of the coordination controller.
The direct current-alternating current converter works in an active power control mode, a reactive power control mode, a sagging control mode and a direct current measurement control mode and is used for switching modes according to the command of the coordination controller in real time, so that the functions of direct current bus voltage support, alternating current power grid power support or alternating current source supply for various electric loads and the like are realized.
Furthermore, the device realizes the rapid interconnection of the information layer and the electric physical layer through the device for rapidly interconnecting the coordination controller, the direct current expansion interface and other energy.
Further, the coordination controller sets the operation modes of the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter in the device according to the operation strategy, and the coordination controller comprises the following steps:
when the device receives a grid-connected local mode operation strategy given by the energy management system, the coordination controller sets the photovoltaic direct current-direct current converter to operate in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, and the direct current-alternating current converter operates in an active power control mode;
and under the grid-connected local mode, the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power, and the battery direct current-direct current converter stabilizes the bus voltage. The DC-AC converter uses the difference value between the power transmitted by the photovoltaic to the DC bus and the charging power allowed by the battery as the grid-connected power transmission power of the DC-AC converter.
Further, the coordination controller sets the operation modes of the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter in the device according to the operation strategy, and the coordination controller comprises the following steps:
when the device receives an off-grid local mode operation strategy given by the energy management system, the coordination controller sets the photovoltaic DC-DC converter to operate in a maximum power tracking mode, the battery DC-DC converter operates in a constant voltage current limiting mode, and the DC-AC converter operates in a droop control mode. And under off-grid local mode, the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power, and the battery direct current-direct current converter stabilizes the bus voltage. The DC-AC converter operates with a preset power curve and voltage curve.
Further, the coordination controller sets the operation modes of the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter in the device according to the operation strategy, and the coordination controller comprises the following steps:
when networking operation is required between two micro-grids, the energy management system issues a networking mode operation strategy to two devices, wherein the two devices comprise an A device and a B device; the coordination controller of the device A sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to work in a constant voltage current limiting mode, the DC-AC converter to work in an active power control mode, the coordination controller of the device B sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to work in a constant voltage current limiting mode, the DC-AC converter to work in an active power control mode, and when a micro-grid where the device A is located has power shortage, the micro-grid where the device B is located is provided through a DC expansion bus.
Further, the coordination controller sets the operation modes of the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter in the device according to the operation strategy, and the coordination controller comprises the following steps:
when networking operation is needed between two micro-grids, the energy management system transmits an off-grid networking mode to two devices, wherein the two devices comprise an A device and a B device; the coordination controller of the device A sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to run in a constant voltage current limiting mode, the DC-AC converter to run in a droop control mode, the coordination controller of the device B sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to run in a constant voltage current limiting mode, the DC-AC converter to run in a droop control mode, and when a micro-grid where the device A is located has power shortage, the micro-grid where the device B is located is provided by a DC expansion bus.
Further, the device further comprises:
and the black start power supply is used for taking power from the energy storage battery, the photovoltaic module and the alternating current power grid through the input end and is used for supporting normal starting function when the device is in a isolated network state.
Further, the device further comprises:
the human-computer interface is communicated with the coordination controller through RS485 and is used for checking the running state, power, voltage, current and event functions of the whole device and setting the system protection parameters of the device.
Further, the device further comprises:
and the Ethernet port is used for coordinating communication connection between the controller and the energy management system.
The RS485 communication interface is used for communication connection between the device and the battery management system;
the CAN communication interface is used for communication connection between the device and the energy management system;
and the switching-in node is used for controlling hardware signals between other micro-grid devices and the device.
And the node is used for connecting hardware signals between the device and other micro-grid equipment.
And the direct current expansion interface is used for connecting the device with direct current buses of other micro-grid devices.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a device capable of realizing quick energy interconnection among a plurality of micro-grids, when the micro-grids need to be networked, a direct current expansion contactor is closed to enable a direct current bus among the micro-grid devices to complete interconnection of an electric physical layer, a coordination controller of the micro-grid devices communicates with an energy management system to complete interconnection of an information layer, the coordination controller of each micro-grid device receives an operation strategy given by the energy management system, and an operation mode, a power flow direction and an output power of a photovoltaic direct current-direct current converter, a battery direct current-direct current converter and a direct current-alternating current converter in the device are set according to the operation strategy.
Drawings
FIG. 1 is a schematic diagram of a system architecture provided by an apparatus for enabling rapid interconnection of energy among a plurality of micro-grids according to the present invention;
FIG. 2 is a schematic diagram of an apparatus for enabling rapid interconnection of energy among a plurality of micro-grids according to the present invention;
FIG. 3 is a power flow diagram of a device in a grid-tie local mode;
FIG. 4 is a power flow diagram of a device in off-grid local mode;
FIG. 5 is a power flow diagram of the device in grid-tie networking mode;
fig. 6 is a power flow diagram of a device in off-network networking mode.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present embodiment, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are presented, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present embodiment and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present embodiment.
Embodiment one:
as shown in fig. 1 and 2, this embodiment provides an apparatus for realizing rapid energy interconnection between a plurality of micro-grids, which is characterized by comprising:
2 photovoltaic direct current-direct current converters, 2 battery direct current-direct current converters, 2 direct current-alternating current converters, 1 coordination controller, 1 black start power supply, 1 man-machine interface, 2 Ethernet ports, 2 RS485 communication interfaces, 2 CAN communication interfaces, 3 switching-in nodes, 3 switching-out nodes and 1 direct current expansion interface.
The device can be rapidly interconnected with other micro-grid devices through the coordination controller and the direct current expansion interface to realize rapid interconnection of the information layer and the electric physical layer.
The photovoltaic direct current-direct current converter adopts a direct current chopper boost circuit topological structure, is provided with an independent control system and is provided with 24 paths of photovoltaic component input interfaces.
The battery DC-DC converter adopts a 2-level bidirectional full-bridge DC-DC topological structure, and is provided with an independent control system, and the 2 battery DC-DC converters are connected with the energy storage battery through an interface. The constant-voltage current limiting, constant-current voltage limiting and constant-power charging and discharging functions are achieved.
The DC-AC converter adopts an E-type three-level half-bridge topological structure and has an independent control system. The device has the functions of active power control, reactive power control, alternating current constant frequency control, constant voltage control, direct current constant voltage current limiting and constant current voltage limiting.
The coordination controller communicates with all converters in the device through a CAN network, and communicates with the energy management system through an Ethernet, so that the quick interconnection of the information layers of the device is realized.
The coordination controller is used for controlling the closing and breaking of the direct current expansion interface contactor, communicating with the energy management system, receiving the operation strategy and the data value given by the energy management system, and setting the operation modes, the power flow direction and the output power of the photovoltaic direct current-direct current converter, the battery direct current-direct current converter and the direct current-alternating current converter in the device according to the operation strategy.
1. Grid-connected local mode
When the device receives grid-connected local mode given by the energy management system, the coordination controller sets the photovoltaic direct current-direct current converter to operate in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, and the direct current-alternating current converter operates in an active power control mode. And under the grid-connected local mode, the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power, and the battery direct current-direct current converter stabilizes the bus voltage. The DC-AC converter uses the difference value between the power transmitted by the photovoltaic to the DC bus and the charging power allowed by the battery as the grid-connected power transmission power of the DC-AC converter.
2. Off-grid local mode
When the device receives the off-grid local mode given by the energy management system, the coordination controller sets the photovoltaic direct current-direct current converter to operate in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, and the direct current-alternating current converter operates in a droop control mode. And under off-grid local mode, the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power, and the battery direct current-direct current converter stabilizes the bus voltage. The DC-AC converter operates with a preset power curve and voltage curve.
3. Networking mode.
When networking operation is needed between two micro-grids, the energy management system transmits a grid-connected networking mode to the two devices, the coordination controller of the device A sets that the photovoltaic direct current-direct current converter in the device A operates in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, the direct current-alternating current converter operates in an active power control mode, the coordination controller of the device B sets that the photovoltaic direct current-direct current converter in the device A operates in the maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, the direct current-alternating current converter operates in an active power control mode, and when the micro-grid where the device A is located has power shortage, the photovoltaic direct current-direct current converter in the device B is provided by the micro-grid where the device B is located through a direct current expansion bus.
4. Off-network networking mode
When networking operation is needed between two micro-grids, the energy management system issues an off-grid networking mode to the two devices, the coordination controller of the device A sets the photovoltaic direct current-direct current converter in the device A to operate in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, the direct current-direct current converter operates in a sagging control mode, the coordination controller of the device B sets the photovoltaic direct current-direct current converter in the device B to operate in the maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, the direct current-alternating current converter operates in a sagging control mode, and when the micro-grid where the device A is located has power shortage, the photovoltaic direct current-direct current converter is provided by the micro-grid where the device B is located through a direct current expansion bus.
The black start power supply has the power taking function from the photovoltaic module interface, the energy storage battery power supply interface and the alternating current power grid.
The human-computer interface is communicated with the coordination controller through RS 485. The system protection device is used for checking the running state, power, voltage, current, event and other functions of the whole device and setting the system protection parameters of the device.
The direct current expansion interface is connected with direct current buses of other micro-grid devices through the contactor, so that quick interconnection of an electric physical layer is realized.
The 12-path photovoltaic module power supply line is connected to the photovoltaic direct current-direct current converter through the isolating switch, the maximum of 2 photovoltaic direct current-direct current converters can be connected to 24 paths of photovoltaic modules, the photovoltaic direct current-direct current converter adopts a direct current chopping boost topology structure, each photovoltaic direct current-direct current converter is formed by 6 paths of direct current chopping boost circuits, and each 2 paths of photovoltaic module power supply line is connected to one path of direct current chopping boost circuits. Each photovoltaic DC-DC converter is connected with a DC bus through a contactor.
Each photovoltaic direct current-direct current converter is provided with an independent controller, is connected with a coordination controller in the device through a CAN communication network, receives a starting signal, a working mode signal and a power value signal which are given by the coordination controller, detects the maximum power value of the photovoltaic module in real time, and tracks the maximum power output point of the maximum photovoltaic module so that the system outputs the maximum power or given power.
The energy storage battery is connected with the battery direct current-direct current converter through the contactor and the fuse, the battery direct current-direct current converter adopts a bidirectional 2-level full-bridge topological structure, and each battery direct current-direct current converter is connected with the direct current bus through the contactor.
Each battery direct current-direct current converter is provided with an independent controller, is connected with a coordination controller in the device through a CAN communication network, receives starting signals and working mode signals given by the coordination controller, and realizes the functions of stabilizing direct current bus voltage, supporting bus power, controlling battery charge and discharge and controlling battery maintenance.
The input end of the DC-AC converter is connected with the DC bus through a fuse and a contactor, and the output end is connected with an AC power grid through a contactor. An E-type three-level half-bridge topological structure is adopted.
Each direct current-alternating current converter is provided with an independent controller, is connected with a coordination controller in the device through a CAN communication network, receives a starting signal, a working mode signal and a power value signal which are given by the coordination controller, and achieves the functions of supporting direct current bus voltage, supporting power of a power grid or providing an alternating current source for an alternating current load.
The coordination controller is communicated with the photovoltaic direct current-direct current converter, the battery direct current-direct current converter and the direct current-alternating current converter through a CAN network and is communicated with the energy management system through an Ethernet.
The black start power supply input end is powered through the energy storage battery, the photovoltaic module and the alternating current network, provides control power for the device, and can support the starting function when the device is in the isolated network state.
The human-computer interface is connected with the coordination controller through RS485 communication, and the running state, the power, the voltage, the current, the event and other functions of the whole device can be checked through the human-computer interface. The system protection parameters of the device may also be set.
The device enables the direct current buses among the micro grid devices to complete interconnection of an electric physical layer by closing the direct current expansion contactor, the coordination controllers of the micro grid devices communicate with the energy management system to complete interconnection of an information layer, the coordination controller of each micro grid device receives an operation strategy given by the energy management system, and the operation modes, the power flow directions and the output power of the photovoltaic direct current-direct current converter, the battery direct current-direct current converter and the direct current-alternating current converter in the device are set according to the operation strategy.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of the invention, "a plurality" means two or more, unless otherwise specifically and clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.

Claims (10)

1. An apparatus for enabling rapid interconnection of energy between a plurality of micro-grids, comprising:
the input end of the photovoltaic direct current-direct current converter is connected with the photovoltaic module through a connector and used for tracking and controlling the maximum power of the photovoltaic module, and the output end of the photovoltaic direct current-direct current converter is connected with the direct current bus through the connector and used for providing power support for the direct current bus;
the input end of the battery direct current-direct current converter is connected with the energy storage battery through the direct current relay, the output end of the battery direct current-direct current converter is connected with the direct current bus through the connector, and the battery direct current-direct current converter is used for realizing the bidirectional flow of power between the battery and the direct current bus and can also provide voltage support for the direct current bus;
the input end of the direct current-alternating current converter is connected with the direct current bus through the contactor; the output end is connected with the power grid through a relay and is used for realizing bidirectional flow of power between the direct current bus and the alternating current power grid;
the coordination controller is communicated with the energy management system through the Ethernet and receives control commands and data values of the energy management system; the CAN network is connected with the photovoltaic DC-DC converter, the battery DC-DC converter and the DC-AC converter, and the rapid networking, the energy flow direction and the power active control function of the device are realized by setting the working mode and the running state of the converters.
2. The device capable of realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the coordination controller is used for controlling the closing and breaking of a direct current expansion interface contactor, communicating with an energy management system, receiving an operation strategy and a data value given by the energy management system, and setting an operation mode, a power flow direction and an output power of a photovoltaic direct current-direct current converter, a battery direct current-direct current converter and a direct current-alternating current converter in the device according to the operation strategy;
the photovoltaic direct current-direct current converter works in a maximum power tracking control mode, can detect the power generation power of the photovoltaic module in real time, and tracks the maximum power point of the photovoltaic module so that the system outputs the maximum power;
the battery direct current-direct current converter works in constant voltage current limiting, constant current voltage limiting and constant power charging and discharging modes and is used for realizing direct current bus voltage support, direct current bus power support, battery charging and discharging and maintenance functions in real time according to the command switching mode of the coordination controller;
the direct current-alternating current converter works in an active power control mode, a reactive power control mode, a sagging control mode and a direct current measurement control mode and is used for switching modes according to the command of the coordination controller in real time, so that direct current bus voltage support, alternating current power grid power support or alternating current source function for various electric loads is realized.
3. The device for realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the device realizes rapid energy interconnection between an information layer and an electric physical layer through a device for rapidly interconnecting a coordination controller and a direct current expansion interface with other energy.
4. The device for realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the coordination controller sets the operation modes of the photovoltaic dc-dc converter, the battery dc-dc converter and the dc-ac converter in the device according to an operation strategy, and the device comprises:
when the device receives a grid-connected local mode operation strategy given by the energy management system, the coordination controller sets the photovoltaic direct current-direct current converter to operate in a maximum power tracking mode, the battery direct current-direct current converter operates in a constant voltage current limiting mode, and the direct current-alternating current converter operates in an active power control mode;
the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power under the grid-connected local mode, and the battery direct current-direct current converter stabilizes the bus voltage; the DC-AC converter uses the difference value between the power transmitted by the photovoltaic to the DC bus and the charging power allowed by the battery as the grid-connected power transmission power of the DC-AC converter.
5. The device for realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the coordination controller sets the operation modes of the photovoltaic dc-dc converter, the battery dc-dc converter and the dc-ac converter in the device according to an operation strategy, and the device comprises:
when the device receives an off-grid local mode operation strategy given by the energy management system, the coordination controller sets the photovoltaic DC-DC converter to operate in a maximum power tracking mode, the battery DC-DC converter operates in a constant voltage current limiting mode, and the DC-AC converter operates in a droop control mode; the photovoltaic direct current-direct current converter transmits power to the direct current bus with maximum power under off-grid local mode, and the battery direct current-direct current converter stabilizes bus voltage; the DC-AC converter operates with a preset power curve and voltage curve.
6. The device for realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the coordination controller sets the operation modes of the photovoltaic dc-dc converter, the battery dc-dc converter and the dc-ac converter in the device according to an operation strategy, and the device comprises:
when networking operation is required between two micro-grids, the energy management system issues a networking mode operation strategy to two devices, wherein the two devices comprise an A device and a B device; the coordination controller of the device A sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to work in a constant voltage current limiting mode, the DC-AC converter to work in an active power control mode, the coordination controller of the device B sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to work in a constant voltage current limiting mode, the DC-AC converter to work in an active power control mode, and when a micro-grid where the device A is located has power shortage, the micro-grid where the device B is located is provided through a DC expansion bus.
7. The device for realizing rapid energy interconnection among a plurality of micro-grids according to claim 1, wherein the coordination controller sets the operation modes of the photovoltaic dc-dc converter, the battery dc-dc converter and the dc-ac converter in the device according to an operation strategy, and the device comprises:
when networking operation is needed between two micro-grids, the energy management system transmits an off-grid networking mode to two devices, wherein the two devices comprise an A device and a B device; the coordination controller of the device A sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to run in a constant voltage current limiting mode, the DC-AC converter to run in a droop control mode, the coordination controller of the device B sets the photovoltaic DC-DC converter in the device to run in a maximum power tracking mode, the battery DC-DC converter to run in a constant voltage current limiting mode, the DC-AC converter to run in a droop control mode, and when a micro-grid where the device A is located has power shortage, the micro-grid where the device B is located is provided by a DC expansion bus.
8. The apparatus for enabling rapid interconnection of energy among a plurality of micro-grids according to claim 1, further comprising:
and the black start power supply is used for taking power from the energy storage battery, the photovoltaic module and the alternating current power grid through the input end and is used for supporting normal starting function when the device is in a isolated network state.
9. The apparatus for enabling rapid interconnection of energy among a plurality of micro-grids according to claim 1, further comprising:
the human-computer interface is communicated with the coordination controller through RS485 and is used for checking the running state, power, voltage, current and event functions of the whole device and setting the system protection parameters of the device.
10. The apparatus for enabling rapid interconnection of energy among a plurality of micro-grids according to claim 1, further comprising:
the Ethernet port is used for coordinating communication connection between the controller and the energy management system;
the RS485 communication interface is used for communication connection between the device and the battery management system;
the CAN communication interface is used for communication connection between the device and the energy management system;
the switching-in node is used for controlling hardware signals between other micro-grid devices and the device;
the switching-out node is used for connecting hardware signals between the device and other micro-grid equipment;
and the direct current expansion interface is used for connecting the device with direct current buses of other micro-grid devices.
CN202310047950.9A 2023-01-31 2023-01-31 Device capable of realizing rapid energy interconnection among multiple micro-grids Pending CN116231733A (en)

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