Multi-energy collaborative intelligent charging station based on micro-grid

Abstract

The utility model discloses a multi-energy collaborative intelligent charging station based on a micro-grid, which relates to the technical field of micro-grids and comprises a micro-grid management system which is respectively in communication connection with a power generation system, an energy storage system and a power supply system. The power generation system comprises a new energy power station and a thermal power station; the new energy power station, the energy storage system and the power supply system are mutually connected in pairs; the power supply system is further connected with the mains supply and the thermal power station. The device can reduce thermal power carbon emission, reduce power utilization cost, balance power utilization peak and valley, relieve the pressure of a commercial power grid, and reduce the risk of power failure due to power shortage. The problems of high power utilization cost, increased carbon emission, aggravated difference of peak and valley power utilization demands, aggravated pressure of a commercial power grid and increased risk of power failure due to power shortage caused by shortage of charging facilities and large consumption of commercial power are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of microgrids, and in particular to a multi-energy collaborative intelligent charging station based on a microgrid. Background Art

[0002] As a way to optimize and integrate distributed power generation, microgrids have become the focus of research in countries around the world and will occupy an important position in the future. With the large-scale blowout of distributed renewable energy generation connected to the distribution network, the large-scale promotion and application of energy storage systems and electric vehicles, and the further increase in the demand for high-reliability and high-quality power supply for important urban loads, microgrids have great development potential.

[0003] As a type of car that has emerged in recent years, new energy vehicles are loved by the majority of families for their low-carbon and green concepts, low energy prices, and intelligent functions. With the rise and popularization of new energy vehicles, although the relevant supporting facilities are gradually improving, the demand for charging new energy vehicles is increasing, resulting in a shortage of charging facilities for new energy vehicles. And as electricity becomes one of the main energy sources for transportation, the demand for city electricity is also increasing. At present, the main source of city electricity is still thermal power generation. The large consumption of city electricity has high electricity costs, which not only increases carbon emissions, but also aggravates the gap between peak and valley electricity demand, increases the pressure on the city power grid, and increases the risk of power outages. Utility Model Content

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the utility model provides a multi-energy collaborative smart charging station based on a microgrid. Based on the microgrid, it utilizes a variety of clean energy to supply electricity according to demand, which can reduce carbon emissions from thermal power generation, reduce electricity costs, balance electricity peaks and valleys, alleviate the pressure on the municipal power grid, and reduce the risk of power outages.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multi-energy collaborative smart charging station based on a microgrid, including a microgrid management system, which is respectively communicated with a power generation system, an energy storage system, and a power supply system;

[0007] The power generation system includes renewable energy power stations and thermal power stations;

[0008] The new energy power station, energy storage system and power supply system are interconnected;

[0009] The power supply system is also connected to the city power supply and thermal power station respectively.

[0010] As a further implementation method, new energy power stations include photovoltaic power generation and wind power generation.

[0011] As a further implementation method, the power supply system gives priority to using electricity from new energy power stations. When the power supply of new energy power stations is insufficient, the power of energy storage stations or municipal electricity is used to ensure the normal operation of the charging station power supply system. In case of emergency, the backup thermal power generation equipment is activated to use petroleum fuel for thermal power generation to supply emergency electricity.

[0012] As a further implementation method, when the electricity supply of the renewable energy power station exceeds the demand, the surplus electricity is stored in the energy storage station.

[0013] As a further implementation method, the power supply system gives priority to the relatively stable photovoltaic power supply in the new energy power station, followed by wind power generation.

[0014] As a further implementation method, the energy storage system is a distributed iron-chromium liquid flow energy storage system, and the distributed iron-chromium liquid flow energy storage system adopts iron-chromium liquid flow batteries.

[0015] As a further implementation method, the distributed iron-chromium liquid flow energy storage system consists of a liquid storage tank, a fuel cell stack, a battery management system, pipelines and other auxiliary components and a container shell.

[0016] As a further implementation method, the distributed iron-chromium liquid flow energy storage system uses a split liquid flow battery energy storage system, with the power unit adopting a standardized design and the capacity unit adopting a customized design to meet the customized requirements for different energy storage needs.

[0017] As a further implementation method, the power supply system includes electric vehicle charging stations, electric two-wheel vehicle battery swap stations, electric bus battery swap stations and charging station working electricity.

[0018] As a further implementation method, the priority order of power supply of the power supply system is work power, electric vehicle charging station, electric bus battery replacement station, and electric two-wheeled vehicle battery replacement station.

[0019] The beneficial effects of the above utility model are as follows:

[0020] The utility model provides a multi-energy collaborative smart charging station based on a microgrid, which adopts a combination of distributed microgrid, distributed energy storage and multiple clean energy power generation to power the charging station, wherein the power generation system includes a new energy power station and a thermal power station, the new energy power station includes photovoltaic power generation and wind power generation, and integrates multiple clean energy to power the power supply system, which can greatly reduce electricity costs and reduce carbon emissions from thermal power. When the new energy power station is short of power supply, power is supplied by a standby thermal power station, which can balance electricity peaks and valleys, relieve the pressure on the city power grid, and reduce the risk of power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Among them, 1. Municipal power grid, 2. Electric vehicle charging station, 3. Two-wheel electric vehicle battery swap station, 4. Bus battery swap station, 5. Working electricity, 6. Microgrid management system, 7. Energy storage station, 8. New energy power station, 9. Thermal power station. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] Embodiment 1

[0026] This embodiment provides a multi-energy collaborative smart charging station based on a microgrid, such as Figure 1 As shown, a multi-energy collaborative smart charging station based on a microgrid includes a microgrid management system, which is communicated with a power generation system, an energy storage system, and a power supply system respectively, and the power generation system, the energy storage system, and the power supply system are interconnected in pairs;

[0027] The power generation system includes new energy power stations and thermal power stations. The new energy power stations include photovoltaic power generation and wind power generation. The new energy power stations, energy storage systems and power supply systems are interconnected; the power supply system is also connected to the city power and thermal power stations respectively.

[0028] The microgrid management system controls the power generation system and the energy storage system to supply and store electricity according to the demand based on the load of the power supply system.

[0029] When the power supply system of the charging station is supplying power, the microgrid management system calculates the real-time wind and solar energy according to the weather and sensors through the existing technology, and obtains the SOC (State of Charge, the battery state of charge, the available state of the remaining charge in the battery, generally expressed as a percentage) of the energy storage system through the BMS equipment in the existing technology. After the power supply system requests the load, the microgrid management system communicates with the other three systems to allocate the work content of the power generation system, the energy storage system, and the power supply system. After the three systems receive the signal from the management system, the new energy power station controls the output (power, frequency, voltage) and on-off of the electric energy through the photovoltaic inverter and the wind power converter; the energy storage system controls the output (power, frequency, voltage) and on-off of the electric energy through the PCS in the existing technology. After receiving the signal from the microgrid management system, the power supply system receives the electric energy and provides the electric energy to the demand side. The power supply system gives priority to the use of the power of the new energy power station, and gives priority to the relatively stable photovoltaic power supply in the new energy power station, followed by wind power generation. When the power supply of the new energy power station is insufficient, the power of the energy storage station or the city power is used to ensure the normal operation of the charging station power supply system. In case of emergency, the backup thermal power generation device is activated to generate thermal power using petroleum fuel to supply emergency electricity. When the power supply of the new energy power station exceeds the demand, the surplus power is stored in the energy storage station.

[0030] The power supply system includes electric vehicle charging stations, electric two-wheel vehicle battery swap stations, electric bus battery swap stations and charging station working electricity. The power supply priority is working electricity, electric vehicle charging stations, electric bus battery swap stations, and electric two-wheel vehicle battery swap stations.

[0031] After meeting the power supply demand, the microgrid management system will obtain the SOC of the energy storage module through the BMS device, and intelligently control the wind, solar and storage according to the SOC, and control the intelligent charging of the power generation system. When the power supply demand is insufficient, the energy storage system will supply power to the load, ensuring the balance of power supply and energy storage, solving the problem of power generation waste and reducing the peak power consumption burden.

[0032] The energy storage system is a distributed iron-chromium liquid flow energy storage system, and the distributed iron-chromium liquid flow energy storage system adopts an iron-chromium liquid flow battery. The liquid flow battery is a battery that realizes the mutual conversion of electrical energy and chemical energy through a reversible redox reaction (i.e., a reversible change in valence state) of the active substances in the positive and negative electrolyte solutions. Due to the particularity of gas stations being flammable and explosive, there are higher requirements for safety. The fire-fighting problems and marginal loss control caused by battery thermal runaway have always been the pain points of energy storage. The liquid flow battery is an aqueous solution, the battery stack and the liquid tank are separated, and it operates at normal temperature and pressure, without the possibility of fire and explosion. The iron-chromium liquid flow battery has the advantages of low electrolyte price, no self-discharge, environmental protection, and independent power and capacity. Based on the higher price advantage of the iron-chromium liquid flow battery, the utility model selects the liquid flow battery for distributed energy storage.

[0033] The distributed ferrochromium liquid flow energy storage system consists of a liquid storage tank, a battery stack, a battery management system, pipelines and other accessories and a container shell. The power of a single system is 125kW. Through series / parallel access, capacity customization is achieved. Multiple groups of energy storage units are connected to the busbar to build a 100-megawatt energy storage system. The distributed ferrochromium liquid flow energy storage system uses a split liquid flow battery energy storage system. The power unit adopts a standardized design and the capacity unit adopts a customized design to meet the customization requirements of different energy storage needs.

[0034] The utility model provides a multi-energy collaborative smart charging station based on a microgrid, which can reduce carbon emissions from thermal power generation, lower electricity costs, balance peak and valley electricity consumption, alleviate pressure on the city power grid, and reduce the risk of power outages due to lack of electricity.

[0035] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-energy collaborative smart charging station based on a microgrid, characterized in that: It includes a microgrid management system, which is communicatively connected with the power generation system, the energy storage system and the power supply system respectively; The power generation system includes a new energy power station and a thermal power station; The new energy power station, energy storage system and power supply system are connected to each other in pairs; The power supply system is also connected to the city power supply and the thermal power station respectively; The power supply system gives priority to using the electricity from the new energy power station. When the power supply of the new energy power station is insufficient, the power of the energy storage station or the city power is used to ensure the normal operation of the charging station power supply system. In case of emergency, the standby thermal power generation device is activated to use petroleum fuel for thermal power generation to supply emergency electricity; The energy storage system is a distributed iron-chromium liquid flow energy storage system, and the distributed iron-chromium liquid flow energy storage system adopts an iron-chromium liquid flow battery; The distributed iron-chromium liquid flow energy storage system consists of a liquid storage tank, a battery stack, a battery management system, pipeline accessories and a container shell; a single system has a power of 125kW, and capacity customization is achieved through series or parallel connection. Multiple groups of energy storage units are connected to the bus to build a 100-megawatt energy storage system; The distributed iron-chromium liquid flow energy storage system uses a split liquid flow battery energy storage system, the power unit adopts a standardized design, and the capacity unit adopts a customized design to meet the customized requirements for different energy storage needs; The power supply system includes electric vehicle charging stations, electric two-wheel vehicle battery swap stations, electric bus battery swap stations and charging station working electricity; the power supply priority of the power supply system is working electricity, electric vehicle charging stations, electric bus battery swap stations, and electric two-wheel vehicle battery swap stations.

2. A multi-energy collaborative smart charging station based on a microgrid as claimed in claim 1, characterized in that: The new energy power station includes photovoltaic power generation and wind power generation.

3. The multi-energy collaborative smart charging station based on microgrid as claimed in claim 1, characterized in that: When the electricity supply of the new energy power station exceeds the demand, the surplus electricity is stored in the energy storage station.

4. A multi-energy collaborative smart charging station based on a microgrid as claimed in claim 2, characterized in that: The power supply system preferentially uses relatively stable photovoltaic power supply in new energy power stations, followed by wind power generation.

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