CN113328464A - Multi-energy micro-grid power supply system based on alternating current bus - Google Patents
Multi-energy micro-grid power supply system based on alternating current bus Download PDFInfo
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- CN113328464A CN113328464A CN202110811377.5A CN202110811377A CN113328464A CN 113328464 A CN113328464 A CN 113328464A CN 202110811377 A CN202110811377 A CN 202110811377A CN 113328464 A CN113328464 A CN 113328464A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- 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
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
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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
- 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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The embodiment of the invention provides a multi-energy micro-grid power supply system based on an alternating current bus, and relates to the technical field of micro-grids. The multi-energy micro-grid power supply system based on the alternating-current bus comprises an energy storage and management module, a photovoltaic module, a fuel cell module and a stealth power station module, wherein the photovoltaic module, the fuel cell module and the stealth power station module are all in communication connection with the energy storage and management module, and the energy storage and management module, the photovoltaic module, the fuel cell module and the stealth power station module are all used for being electrically connected to the alternating-current bus. The system can integrate multiple new energy sources and has the advantages of standardization, modularization, multi-energy source complementation, parallel operation capacity expansion, reliable and stable power supply in multiple working modes and the like.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a multi-energy micro-grid power supply system based on an alternating current bus.
Background
Under the guidance of energy-saving and environment-friendly policies, with the development of new energy technologies, the new energy requirements for providing a power supply are more and more increased, and the application is more and more wide, but the energy type of the new energy serving as the power supply is single at present, the working mode is also single, the energy management and control and networking type micro-grid system is less, and a series of intelligent controls of realizing load power adaptive matching, rich electric energy adaptive storage, adaptive judgment of load priority, intelligent operation of graded power supply, optimal scheduling of distributed electric energy resources, adaptive parallel connection of an electric power system and the like are difficult to meet the multi-energy micro-grid power supply system under the requirement of multistage load power consumption, so that the requirements of accurate management and scheduling of energy in a region are met.
Disclosure of Invention
The invention aims to provide a multi-energy micro-grid power supply system based on an alternating current bus, which can integrate multiple new energy and has the advantages of standardization, modularization, multi-energy complementation, parallel operation capacity expansion, reliable and stable power supply in multiple working modes and the like.
Embodiments of the invention may be implemented as follows:
in a first aspect, the invention provides a multi-energy microgrid power supply system based on an alternating current bus, which comprises an energy storage and management module, a photovoltaic module, a fuel cell module and a stealth power station module, wherein the photovoltaic module, the fuel cell module and the stealth power station module are all in communication connection with the energy storage and management module, and the energy storage and management module, the photovoltaic module, the fuel cell module and the stealth power station module are all used for being electrically connected to the alternating current bus.
In an optional embodiment, the AC bus-based multi-energy microgrid power supply system further comprises a first DC/DC converter, a first DC/AC converter and a first change-over switch, the fuel cell module, the first DC/DC converter, the first DC/AC converter and the AC bus are electrically connected in sequence, and the first DC/AC converter, the first change-over switch and the AC load are electrically connected in sequence.
In an optional embodiment, the AC bus-based multi-energy microgrid power supply system further comprises a second DC/DC converter, a second DC/AC converter and a second change-over switch, the photovoltaic module, the second DC/DC converter, the second DC/AC converter and the AC bus are electrically connected in sequence, and the second DC/AC converter, the second change-over switch and the AC load are electrically connected in sequence.
In an optional embodiment, the AC bus-based multi-energy microgrid power supply system further comprises a third DC/AC converter and a third change-over switch, the stealth power station module, the third DC/AC converter and the third change-over switch are electrically connected with the AC bus in sequence, and the third DC/AC converter, the third change-over switch and the AC load are electrically connected in sequence.
In an alternative embodiment, the AC bus-based multi-energy microgrid power supply system further comprises an AC/DC converter, the stealth power station module, the AC/DC converter and the third DC/AC converter are electrically connected in sequence, and the energy storage and management module comprises an energy storage battery electrically connected to the third DC/AC converter.
In an alternative embodiment, the energy storage and management module comprises an energy storage unit for electrically connecting to the ac bus and to the ac load via a diverter switch, and an energy management unit for monitoring the individual power generation modules.
In an optional embodiment, the energy storage unit comprises a lithium battery pack, a battery management system and an energy storage bidirectional converter, the lithium battery pack, the energy storage bidirectional converter and an alternating current bus are sequentially in electric connection, the energy management unit comprises a power distribution system and an operation monitoring system, the power distribution system is used for controlling electric energy output of each power generation module, the operation monitoring system comprises a control module and a monitoring module, the control module is used for performing communication control and energy management on each power generation module, and the monitoring module is used for man-machine interaction.
In an optional embodiment, the energy storage and management module is configured to control the ac bus-based multi-energy microgrid power supply system to enter a grid-connected operation mode on the condition that it is detected that mains electricity is connected to the ac bus-based multi-energy microgrid power supply system;
the energy storage and management module is also used for controlling the multi-energy micro-grid power supply system based on the alternating current bus to enter an off-grid operation mode under the condition that the commercial power is detected not to access the multi-energy micro-grid power supply system based on the alternating current bus.
In an optional embodiment, under the condition that the multi-energy micro-grid power supply system based on the alternating-current bus enters a grid-connected operation mode, the energy storage and management module is used for controlling the photovoltaic module, the fuel cell module and the stealth power station module to output power according to respective maximum power points in sequence under the condition that load access is detected;
detecting the SOC of an energy storage unit under the condition that the load power is smaller than the maximum power point output power of a photovoltaic module and a fuel cell module, carrying out charging control on the energy storage unit under the condition that the SOC is smaller than 90%, wherein the charging power is larger than the overflow power of power generation units of the photovoltaic module and the fuel cell module, and adjusting the output power of the power generation units of the photovoltaic module and the fuel cell module to be equal to the load consumption power under the condition that the SOC is larger than or equal to 90%, so that the power generation units of the photovoltaic module and the fuel cell module cannot feed energy into a power grid;
under the condition that the load power exceeds the maximum power point output power of the photovoltaic module and the fuel cell module, the stealth power station module is opened for supplementing power output, the energy storage unit is charged and controlled under the condition that the SOC is less than 90%, and the energy storage unit is controlled to be in standby under the condition that the SOC is more than or equal to 90%.
In an optional embodiment, under the condition that the multi-energy microgrid power supply system based on the alternating current bus enters an off-grid operation mode, the energy storage and management module is used for detecting the SOC of the energy storage unit under the condition that the load power is lower than the maximum power point output power of the photovoltaic module and the fuel cell module, and controlling the output power of the photovoltaic module and the fuel cell module to be equal to the load consumption under the condition that the SOC is larger than or equal to 90%; under the condition that the SOC is less than 90%, the power generation units of the photovoltaic module and the fuel cell module are controlled to operate according to the maximum power point so as to charge and store the energy storage unit while meeting the requirement of load power supply;
under the condition that the load power is higher than the maximum output power of the photovoltaic module and the fuel cell module, the power generation units of the photovoltaic module and the fuel cell module are controlled to output power according to the maximum power point, insufficient power is provided by the energy storage unit, the stealth power station module is standby, the SOC of the energy storage unit is detected in real time, the stealth power station module is started under the condition that the SOC is less than 50%, the stealth power station module replaces the energy storage unit to supply power, extra redundant power charges the energy storage unit, the stealth power station module is closed under the condition that the SOC is more than or equal to 90%, and the power supply requirements of loads are continuously met by the photovoltaic module, the fuel cell module and the energy storage unit;
under the condition that the photovoltaic module, the fuel cell module and the stealth power station module are simultaneously output according to the maximum power and cannot meet the power consumption of the load, when the capacity of an oil tank of the stealth power station module has a full-load power supply capacity for 1 hour, the three-level load is cut off, the two-level load and the one-level load are reserved, insufficient power is provided by the energy storage unit, the SOC of the energy storage unit is detected, and the two-level load is cut off and only the one-level load is reserved under the condition that the SOC is less than 40%.
The alternating-current bus-based multi-energy micro-grid power supply system provided by the embodiment of the invention has the beneficial effects that:
1. the multi-load centralized power supply system has the advantages that power supply in multiple working modes is achieved through the parallel connection of the alternating current buses and the energy storage and management module, various new energy sources are integrated, high efficiency and energy conservation are achieved under the condition of different load capacities, each module is electrically connected to the alternating current buses, single-phase alternating current is output through the alternating current buses, load priority is controlled, and centralized power supply guarantee and distributed power supply guarantee are provided for multi-level loads;
2. the technical route that each module converges to be the alternating current bus is adopted, and the advantages of standardization, modularization, multi-energy complementation, parallel operation capacity expansion, reliable and stable power supply in various working modes and the like are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram illustrating a multi-energy microgrid power supply system based on an ac bus according to an embodiment of the present invention;
fig. 2 is a working schematic diagram of a multi-energy-source microgrid power supply system based on an ac bus according to an embodiment of the present invention.
Icon: 1-a multi-energy micro-grid power supply system based on an alternating current bus; 2-energy storage and management module; 201-mains interface; 202-parallel machine interface; 3-a photovoltaic module; 4-a fuel cell module; 5-a stealth power station module; 6-a first DC/DC converter; 7-a first DC/AC converter; 8-a first diverter switch; 9-a second DC/DC converter; 10-a second DC/AC converter; 11-a second diverter switch; 12-a third DC/AC converter; 13-a third diverter switch; 15-an energy storage battery; a 16-AC/DC converter; 17-a fourth diverter switch; 18-ac load; 19-first order load; 20-secondary load; 21-third level load; 22-ac bus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the present embodiment provides an ac bus-based multi-energy microgrid power supply system 1, where the ac bus-based multi-energy microgrid power supply system 1 includes an energy storage and management module 2, a photovoltaic module 3, a fuel cell module 4, and a stealth power station module 5, where each module is in a standard container structure.
The photovoltaic module 3, the fuel cell module 4 and the stealth power station module 5 are all in communication connection with the energy storage and management module 2. The energy storage and management module 2 is for electrical connection to a primary load 19, a secondary load 20 and a tertiary load 21.
The fuel cell module 4 comprises a hydrogen fuel storage tank, a hydrogen fuel cell and an inverter, can directly output the hydrogen fuel power generation electric energy of the fuel cell module 4 to an alternating current bus 22 to form a power supply system for supplying power, and can also be connected to an alternating current load 18 through a change-over switch, so that the fuel cell module 4 can independently supply power to the alternating current load 18.
The photovoltaic module 3 comprises a semi-flexible solar cell module, a photovoltaic grid-connected and grid-disconnected integrated inverter and an energy storage battery 15 pack, photovoltaic power generation electric energy of the photovoltaic module 3 can be directly inverted and output to an alternating current bus 22 to form a power supply system for supplying power, and the power can also be connected to an alternating current load 18 through a change-over switch, so that the photovoltaic module 3 can independently supply power to the alternating current load 18.
The stealth power station module 5 adopts the technical form of integrating all components into a standard container and integrating the infrared stealth function on the container, and consists of a container, an ultra-silent power station unit, a controller, a radiator, a fuel tank, a storage battery and the like, wherein the ultra-silent power station unit contains a high-speed diesel engine, a generator and a sound-proof cover. The stealth power station module 5 can be directly connected with the alternating current bus 22 in parallel to form a power supply system for supplying power, and can also be electrically connected to the alternating current load 18 through a change-over switch, so that the stealth power station module 5 can independently supply power to the alternating current load 18.
The energy storage and management module 2 comprises an energy storage unit for electrical connection to the ac bus 22 and to the ac load 18 by means of a diverter switch, so that the energy storage unit can supply power to the ac load 18 alone, and an energy management unit. The energy storage unit comprises a lithium battery pack, a battery management system and an energy storage bidirectional converter, the lithium battery pack, the energy storage bidirectional converter and the alternating current bus 22 are sequentially connected in an electric mode, bidirectional flow of energy can be achieved, the lithium battery pack can be charged through other modules, and electric energy can be directly output to the alternating current bus 22.
The energy management unit is used for monitoring each power generation module. The energy management unit comprises a power distribution system and an operation monitoring system, wherein the power distribution system is used for controlling the electric energy output of each power generation module as a power transmission junction, and specifically, the power distribution system is used for realizing the local centralized access function of each power generation module in a region and is responsible for the electric energy output of each power generation module and the electric energy transmission of electric loads in the region.
The operation monitoring system is used as a power dispatching hub and is responsible for dispatching power supply and utilization of each power generation module and load. The operation monitoring system comprises a control module and a monitoring module, wherein the control module is used for carrying out communication control and energy management on each power generation module, specifically, the control module adopts an embedded ARM system, is stable in operation and comprises various interfaces such as Ethernet, RS485, DI/DO and CAN, and the requirements of communication control and energy management on each device are met. The monitoring module is used for man-machine interaction and friendly display of system operation information.
Each module of the alternating-current bus-based multi-energy micro-grid power supply system 1 based on the alternating-current bus 22 can form a micro-grid system to realize integral power supply, and each module can also independently supply power to the outside. The energy storage and management module 2 further has a commercial power interface 201 and a parallel operation interface 202, and has a parallel operation capacity expansion function of supplying power to all loads and accessing other power supply systems through commercial power under the condition of the commercial power.
Referring to fig. 2, the energy storage and management module 2, the photovoltaic module 3, the fuel cell module 4 and the cloaking power station module 5 are all for electrical connection to an ac bus 22.
The multi-energy micro-grid power supply system 1 based on the alternating current bus further comprises a first DC/DC converter 6, a first DC/AC converter 7 and a first change-over switch 8, wherein the fuel cell module 4, the first DC/DC converter 6, the first DC/AC converter 7 and the alternating current bus 22 are sequentially electrically connected, and the first DC/AC converter 7, the first change-over switch 8 and the alternating current load 18 are sequentially electrically connected.
The multi-energy microgrid power supply system 1 based on the alternating current bus further comprises a second DC/DC converter 9, a second DC/AC converter 10 and a second change-over switch 11, the photovoltaic module 3, the second DC/DC converter 9, the second DC/AC converter 10 and the alternating current bus 22 are sequentially in electric connection, and the second DC/AC converter 10, the second change-over switch 11 and the alternating current load 18 are sequentially in electric connection.
The multi-energy micro-grid power supply system 1 based on the alternating current bus further comprises a third DC/AC converter 12 and a third change-over switch 13, the stealth power station module 5, the third DC/AC converter 12, the third change-over switch 13 and the alternating current bus 22 are sequentially in electric connection, and the third DC/AC converter 12, the third change-over switch 13 and the alternating current load 18 are sequentially in electric connection.
The multi-energy micro-grid power supply system 1 based on the alternating current bus further comprises an AC/DC converter 16, the stealth power station module 5, the AC/DC converter 16 and a third DC/AC converter 12 are sequentially electrically connected, the energy storage and management module 2 comprises energy storage electricity (15), and an energy storage battery 15 is electrically connected to the third DC/AC converter 12. in addition, the stealth power station module 5 can also be electrically connected to an alternating current load 18 through a fourth selector switch 17, so that the stealth power station module 5 can independently supply power to the alternating current load 18.
The ac bus-based multi-energy microgrid power supply system 1 provided by the present embodiment at least includes the following operating modes: a grid-connected operation mode, an off-grid operation mode, a single-module independent power supply mode and a cascade expansion mode, and the modes are described in detail below.
1) Grid connected mode of operation
The energy storage and management module 2 controls the multi-energy micro-grid power supply system 1 based on the alternating current bus to enter a grid-connected operation mode under the condition that the mains supply is detected to be connected into the multi-energy micro-grid power supply system 1 based on the alternating current bus.
Under the condition that a multi-energy micro-grid power supply system 1 based on an alternating current bus enters a grid-connected operation mode, a photovoltaic module 3 and a fuel cell module 4 are used as a power output link, an energy storage unit and a stealth power station module 5 are used as a back-up power supply, and in order to guarantee the power supply capacity of a load, all parts need to be controlled according to the following requirements:
a) the energy storage and management module 2 controls the photovoltaic module 3, the fuel cell module 4 and the stealth power station module 5 to output power according to respective maximum power points in sequence under the condition of detecting load access;
b) the energy storage and energy management module 2 detects the SOC of the energy storage unit under the condition that the detected load power is smaller than the maximum power point output power of the photovoltaic module 3 and the fuel cell module 4, performs charging control on the energy storage unit under the condition that the SOC is smaller than 90%, the charging power is larger than the overflow power of the power generation units of the photovoltaic module 3 and the fuel cell module 4, and adjusts the output power of the power generation units of the photovoltaic module 3 and the fuel cell module 4 to be equal to the load consumption power under the condition that the SOC is larger than or equal to 90%, so that the power generation units of the photovoltaic module 3 and the fuel cell module 4 cannot feed energy into a power grid;
c) the energy storage and energy management module 2 opens the stealth power station module 5 for supplementing power output under the condition that the detected load power exceeds the maximum power point output power of the photovoltaic module 3 and the fuel cell module 4, detects the SOC of the energy storage unit at the same time, performs charging control on the energy storage unit under the condition that the SOC is less than 90%, properly adjusts the charging power according to the SOC, and controls the energy storage unit to be in standby under the condition that the SOC is more than or equal to 90%.
2) Off-grid operating mode
The energy storage and management module 2 controls the AC bus-based multi-energy microgrid power supply system 1 to enter an off-grid operation mode under the condition that the mains supply is detected not to access the AC bus-based multi-energy microgrid power supply system 1.
Under the condition that a multi-energy micro-grid power supply system 1 based on an alternating current bus enters an off-grid operation mode, an energy storage unit is a main execution link of power regulation and a control link of system voltage, a photovoltaic module 3, a fuel cell module 4 and a stealth power station module 5 are output links of power, and in order to guarantee power supply capacity of loads, all parts need to be controlled according to the following requirements:
a) the energy storage and energy management module 2 detects the SOC of the energy storage unit under the condition that the detected load power is lower than the maximum power point output power of the photovoltaic module 3 and the fuel cell module 4, and controls the output power of the photovoltaic module 3 and the fuel cell module 4 to be equal to the load consumption under the condition that the SOC is more than or equal to 90 percent; under the condition that the SOC is less than 90%, the power generation units of the photovoltaic module 3 and the fuel cell module 4 are controlled to operate according to the maximum power point, so that the functions of the photovoltaic module 3 and the fuel cell module 4 are exerted to the maximum extent, and the energy storage unit is charged and stored while the load power supply is met;
b) the energy storage and energy management module 2 controls the power generation units of the photovoltaic module 3 and the fuel cell module 4 to output power according to the maximum power point under the condition that the detected load power is higher than the maximum output power of the photovoltaic module 3 and the fuel cell module 4, insufficient power is provided by the energy storage unit, the stealth power station module 5 is standby, the SOC of the energy storage unit is detected in real time, the stealth power station module 5 is started under the condition that the SOC is less than 50%, the energy storage unit is replaced by the stealth power station module 5 to supply power, extra redundant power charges the energy storage unit, the stealth power station module 5 is closed under the condition that the SOC is more than or equal to 90%, and the photovoltaic module 3, the fuel cell module 4 and the energy storage unit continuously meet the power supply requirement of the load;
c) the energy storage and energy management module 2 cuts off the tertiary load 21 and reserves the secondary load 20 and the primary load 19 when detecting that the photovoltaic module 3, the fuel cell module 4 and the stealth power station module 5 are simultaneously output according to the maximum power and cannot meet the condition of load power consumption and 1 hour of full-load power supply capacity remains in the oil tank capacity of the stealth power station module 5, insufficient power is provided by the energy storage unit, the SOC of the energy storage unit is detected, and the secondary load 20 is cut off and only the primary load 19 is reserved under the condition that the SOC is less than 40%.
3) Single module independent power supply mode
Each power generation module is electrically connected to an alternating current load 18 through a selector switch, and the energy storage and energy management module 2 switches the working modes of grid connection, grid disconnection and independent power supply of the power generation modules, so that single-module independent power supply is realized.
4) Cascaded capacity expansion mode
The multi-energy micro-grid power supply system 1 based on the alternating current bus has a unique dynamic capacity expansion function based on a mains supply interface 201 and a parallel operation interface 202 in a power distribution system, can be used as an independent power supply system, can realize parallel operation with other power supply systems, can flexibly enhance power supply capacity according to needs, and can meet the requirement of high-power consumption to the maximum extent through the mode of dividing into whole parts and dividing into whole parts.
The ac bus-based multi-energy microgrid power supply system 1 provided by the embodiment has the beneficial effects that:
1. the power supply in multiple working modes is realized through the parallel connection of the alternating current buses 22 and the energy storage and management module 2, various new energy sources are integrated, under the condition of different load capacities, the efficiency and the energy conservation are realized, 230V and 50Hz single-phase alternating current is output, the load priority is controlled, and the centralized power supply guarantee and the distributed power supply guarantee are provided for the multi-stage load;
2. the technical route that each module converges into single-phase 230V AC bus 22 is adopted, and the method has the advantages of standardization, modularization, multi-energy complementation, parallel operation capacity expansion, reliable and stable power supply in various working modes and the like, and is suitable for special use environments such as field complexity and the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a multipotency source microgrid power supply system based on exchange bus, its characterized in that, multipotency source microgrid power supply system based on exchange bus includes energy storage and energy management module (2), photovoltaic module (3), fuel cell module (4) and stealthy power station module (5), photovoltaic module (3) fuel cell module (4) with stealthy power station module (5) all with energy storage and energy management module (2) communication are connected, energy storage and energy management module (2) photovoltaic module (3) fuel cell module (4) with stealthy power station module (5) all are used for electric power to be connected to exchange bus (22).
2. The AC bus based multi-energy microgrid power supply system according to claim 1, characterized in that it further comprises a first DC/DC converter (6), a first DC/AC converter (7) and a first change-over switch (8), the fuel cell module (4), the first DC/DC converter (6), the first DC/AC converter (7) and the AC bus (22) being electrically connected in sequence, the first DC/AC converter (7), the first change-over switch (8) and the AC load (18) being electrically connected in sequence.
3. An AC bus based multi-energy microgrid power supply system according to claim 1, characterized in that it further comprises a second DC/DC converter (9), a second DC/AC converter (10) and a second change-over switch (11), the photovoltaic module (3), the second DC/DC converter (9), the second DC/AC converter (10) and the AC bus (22) being electrically connected in sequence, the second DC/AC converter (10), the second change-over switch (11) and the AC load (18) being electrically connected in sequence.
4. The AC busbar-based multi-energy microgrid power supply system according to claim 1, further comprising a third DC/AC converter (12) and a third diverter switch (13), the cloaking power station module (5), the third DC/AC converter (12) and the third diverter switch (13) being electrically connected in sequence to the AC busbar (22), the third DC/AC converter (12), the third diverter switch (13) and an AC load (18) being electrically connected in sequence.
5. An AC bus based multi-energy microgrid power supply system according to claim 4, characterized in that it further comprises an AC/DC converter (16), the cloaking power station module (5), the AC/DC converter (16) and the third DC/AC converter (12) being electrically connected in sequence, the energy storage and energy management module (2) comprising an energy storage battery (15), the energy storage battery (15) being electrically connected to the third DC/AC converter (12).
6. An ac bus based multi-energy microgrid powering system according to claim 1, characterized in that the energy storage and energy management modules (2) comprise energy storage units for electrical connection to the ac bus (22) and to ac loads (18) through switchgears and energy management units for monitoring the individual power generation modules.
7. The AC bus-based multi-energy microgrid power supply system according to claim 6, characterized in that the energy storage unit comprises a lithium battery pack, a battery management system and an energy storage bidirectional converter, the lithium battery pack, the energy storage bidirectional converter and the AC bus (22) are electrically connected in sequence, the energy management unit comprises a power distribution system and an operation monitoring system, the power distribution system is used for controlling the electric energy output of each power generation module, the operation monitoring system comprises a control module and a monitoring module, the control module is used for performing communication control and energy management on each power generation module, and the monitoring module is used for man-machine interaction.
8. The ac bus-based multi-energy microgrid power supply system according to claim 6, characterized in that the energy storage and management module (2) is configured to control the ac bus-based multi-energy microgrid power supply system to enter a grid-connected mode of operation on condition that it detects that mains electricity is connected to the ac bus-based multi-energy microgrid power supply system;
the energy storage and management module (2) is also used for controlling the multi-energy microgrid power supply system based on the alternating current bus to enter an off-grid operation mode under the condition that the mains supply is not accessed to the multi-energy microgrid power supply system based on the alternating current bus.
9. The ac bus based multi-energy microgrid power supply system according to claim 8, characterized in that, on condition that the ac bus based multi-energy microgrid power supply system enters a grid-connected operation mode, the energy storage and management module (2) is configured to control the photovoltaic module (3), the fuel cell module (4) and the cloaking power station module (5) to output power according to respective maximum power points in turn on condition that a load access is detected;
detecting the SOC of the energy storage unit under the condition that the load power is smaller than the maximum power point output power of the photovoltaic module (3) and the fuel cell module (4), performing charging control on the energy storage unit under the condition that the SOC is smaller than 90%, wherein the charging power is larger than the overflow power of the photovoltaic module (3) and the power generation unit of the fuel cell module (4), and adjusting the output power of the power generation unit of the photovoltaic module (3) and the power generation unit of the fuel cell module (4) to be equal to the load consumption power under the condition that the SOC is larger than or equal to 90% so that the power generation units of the photovoltaic module (3) and the fuel cell module (4) cannot feed energy into a power grid;
and under the condition that the load power exceeds the maximum power point output power of the photovoltaic module (3) and the fuel cell module (4), the stealth power station module (5) is turned on for supplementing power output, the energy storage unit is charged and controlled under the condition that the SOC is less than 90%, and the energy storage unit is controlled to be in standby under the condition that the SOC is more than or equal to 90%.
10. The AC bus-based multi-energy microgrid power supply system according to claim 8, characterized in that the energy storage and management module (2) is used for detecting the SOC of the energy storage unit under the condition that the load power is lower than the maximum power point output power of the photovoltaic module (3) and the fuel cell module (4) and controlling the output power of the photovoltaic module (3) and the fuel cell module (4) to be equal to the load consumption under the condition that the SOC is more than or equal to 90%; under the condition that the SOC is less than 90%, controlling the power generation units of the photovoltaic module (3) and the fuel cell module (4) to operate according to the maximum power point so as to charge and store the energy storage unit while meeting the requirement of load power supply;
under the condition that the load power is higher than the maximum output power of the photovoltaic module (3) and the fuel cell module (4), controlling the power generation units of the photovoltaic module (3) and the fuel cell module (4) to output power according to the maximum power point, providing insufficient power by the energy storage unit, enabling the stealth power station module (5) to be standby, detecting the SOC of the energy storage unit in real time, starting the stealth power station module (5) under the condition that the SOC is less than 50%, replacing the energy storage unit by the stealth power station module (5) to supply power, charging the energy storage unit by extra redundant power, closing the stealth power station module (5) under the condition that the SOC is more than or equal to 90%, and continuously meeting the power supply requirement of the load by the photovoltaic module (3), the fuel cell module (4) and the energy storage unit;
under the condition that the photovoltaic module (3), the fuel cell module (4) and the stealth power station module (5) are simultaneously output according to the maximum power and cannot meet the power consumption of the load, when the capacity of an oil tank of the stealth power station module (5) remains the full-load power supply capacity for 1 hour, a tertiary load (21) is cut off, a secondary load (20) and a primary load (19) are reserved, insufficient power is provided by the energy storage unit, the SOC of the energy storage unit is detected, the secondary load (20) is cut off and only the primary load (19) is reserved under the condition that the SOC is less than 40%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050659A (en) * | 2021-11-16 | 2022-02-15 | 中国电子科技集团公司第二十九研究所 | Microminiature composite energy device |
| CN114301096A (en) * | 2021-12-31 | 2022-04-08 | 中国人民解放军火箭军工程大学 | Micro-grid system based on aluminum-air battery and scheduling method |
| WO2024055307A1 (en) * | 2022-09-16 | 2024-03-21 | 中国电力科学研究院有限公司 | Microgrid system, control method therefor, device, storage medium and program product |
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2021
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050659A (en) * | 2021-11-16 | 2022-02-15 | 中国电子科技集团公司第二十九研究所 | Microminiature composite energy device |
| CN114050659B (en) * | 2021-11-16 | 2023-05-26 | 中国电子科技集团公司第二十九研究所 | Microminiature composite energy device |
| CN114301096A (en) * | 2021-12-31 | 2022-04-08 | 中国人民解放军火箭军工程大学 | Micro-grid system based on aluminum-air battery and scheduling method |
| CN114301096B (en) * | 2021-12-31 | 2024-01-12 | 中国人民解放军火箭军工程大学 | Micro-grid system based on aluminum-air battery and scheduling method |
| WO2024055307A1 (en) * | 2022-09-16 | 2024-03-21 | 中国电力科学研究院有限公司 | Microgrid system, control method therefor, device, storage medium and program product |
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