Multi-station fusion-based transformer substation

Abstract

According to the multi-station fusion type transformer substation, infrastructures such as a traditional transformer substation, a photovoltaic power station and a charging station are integrated to form a comprehensive energy system integrating multiple functions such as power distribution, transmission, power generation and charging, efficient utilization of resources is achieved, and repeated construction and resource waste are avoided; the invention comprises a multi-station fusion-based transformer substation, and the transformer substation comprises a transformer substation which is used for converting voltage grades, and collecting and distributing electric energy; the power station adopts a photovoltaic micro-grid system and can be used by a power electrical load of an air conditioner in a secondary equipment room; the charging station comprises an integrated direct current charging pile and is used for vehicle charging and charging operation requirements of fire fighting and equipment transportation; and the data center processes and analyzes data transmitted by the transformer substation, the power station and the charging station, and comprises a cabinet, network equipment, a server, a processor and a memory.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer substations, and in particular to a transformer substation based on multi-station integration. Background Art

[0002] With the increasing awareness of environmental protection and the continuous advancement of technology, new energy vehicles such as electric cars and electric buses are being rapidly promoted around the world. These vehicles mainly rely on electricity resources as energy supply, so the demand for charging facilities is increasing. However, traditional substations are mainly designed for power distribution and transmission, and do not have direct charging functions, which leads to many inconveniences in charging new energy vehicles.

[0003] Traditional substations usually have a single function, namely power distribution and transmission. However, as the scale and complexity of the power grid increase, traditional substations face some challenges and limitations. For example, they may need to occupy a large area of ​​land to accommodate substation equipment and other related facilities, which is especially a problem in cities. In addition, traditional substations are often located on the main line of the power grid, far away from the power load point and distributed energy generation devices, which increases power transmission losses and the length of the transmission line.

[0004] Xinjiang has become an ideal place for photovoltaic power generation due to its unique geographical location and climatic conditions. There is plenty of sunlight and many sunny days here, which provides unique conditions for photovoltaic power generation. By installing solar panels, solar energy can be converted into electrical energy to meet the electricity needs of substations.

[0005] In order to solve the contradiction between the charging demand of new energy vehicles and the single function of traditional substations, and to make full use of the advantages of light resources in Xinjiang, it is particularly important to develop a multi-station integrated substation. This substation can not only realize the basic functions of power transformation and transmission, but also introduce photovoltaic power generation and charging facilities to form a joint operation system of large-scale power grids and small-scale power grids. By integrating various infrastructures such as substations, photovoltaic stations, and charging stations, the multi-station integrated substation can realize comprehensive energy management, solve the problem of power supply and demand balance, provide comprehensive energy services, and realize comprehensive and efficient utilization of energy.

[0006] In view of the promotion of new energy vehicles, the limitations of traditional substations and the full utilization of photovoltaic power generation, the development of a multi-station integrated substation has become an urgent need. This new type of substation integrates traditional substations, photovoltaic power stations, charging stations and other infrastructure to form an integrated energy system that integrates multiple functions such as power distribution, transmission, power generation and charging. Summary of the invention

[0007] The present invention aims to address the technical defects of the prior art and provide a multi-station integrated substation, which integrates traditional substations, photovoltaic power stations, charging stations and other infrastructure to form a comprehensive energy system that integrates multiple functions such as power distribution, transmission, power generation and charging, thereby achieving efficient use of resources and avoiding duplicate construction and waste of resources.

[0008] The present invention provides the following technical solution: a multi-station integrated substation, comprising:

[0009] Substation, used for transforming voltage level, collecting and distributing electric energy, including 110kV indoor GIS equipment, 35kV indoor gas-filled cabinet, 10kV switch cabinet, main transformer, 10kV capacitor, 35kV arc suppression coil equipment;

[0010] The power station uses a photovoltaic microgrid system to supply the power load of the air conditioning in the secondary equipment room;

[0011] Charging stations, including integrated DC charging piles, for vehicle charging and charging operation requirements for fire protection and equipment transportation;

[0012] Data centers process and analyze data transmitted from substations, power stations, and charging stations, including cabinets, network equipment, servers, processors, and storage.

[0013] Preferably, the 110kV indoor GIS equipment is arranged in a 110kV distribution room, the 35kV indoor gas cabinet and the 10kV switch cabinet are arranged in a 35kV / 10kV high-voltage room, the main transformer is arranged outdoors, the 10kV capacitor is arranged in a capacitor room, and the 35kV arc suppression coil equipment is arranged in a 35kV arc suppression coil room.

[0014] Preferably, it also includes a secondary equipment room, a safety tool room, a data room, a fire water tank, a pump room and auxiliary rooms.

[0015] Preferably, the integrated DC charging piles are provided in a plurality of units, the number of charging parking spaces provided at the corresponding positions thereof is twice the number of the integrated DC charging piles, and a charging carport is provided above the charging parking spaces.

[0016] Preferably, the photovoltaic microgrid system includes a solar cell module, a photovoltaic grid-connected inverter, an AC grid-connected distribution cabinet, and a mounting bracket. The solar cell module is connected to the photovoltaic grid-connected inverter using a connecting cable. The AC grid-connected distribution cabinet is arranged in the secondary equipment room. The outgoing line of the photovoltaic grid-connected inverter is laid to the access point AC grid-connected control cabinet, and is connected to the double-cut switch receiving end of the air-conditioning power distribution box in the secondary equipment room through the AC grid-connected control cabinet. The solar cell module is fixed to the top of the charging carport through a mounting bracket.

[0017] Preferably, the charging station also includes a billing control terminal for human-computer interaction, metering, card swiping, BMS communication, and control guidance. The billing control terminal includes a 9.7-inch touch screen, communicates with the station control system via RJ45, receives station control instructions, and sends the charging status to the station control system. The station control system is connected to the data center through a network.

[0018] Preferably, the charging station also includes a video security monitoring system for monitoring the charging parking spaces.

[0019] Preferably, the charging carport comprises a carport and a metal frame, and the metal frame is connected downward to a grounding grid.

[0020] Preferably, the solar cell assembly is a monocrystalline silicon cell assembly, and the specification is 540Wp. The number of the monocrystalline silicon cell assemblies is 28, which are connected in series and in parallel to form a grid-connected power generation unit, and connected to a 380V AC power grid through a photovoltaic grid-connected inverter;

[0021] The solar cell assembly is installed at an inclination angle of 29 degrees.

[0022] Preferably, the power generation calculation formula of the power station is: E p =H A ×P AZ ×K, where H A is the total solar radiation on the horizontal surface, P AZ is the installed capacity of solar cell modules, K is the comprehensive efficiency coefficient;

[0023] Among them, K = K1×K2×K3×K4×K5×K6×K7×K8, where K1 is the component type correction coefficient, K2 is the inclination and azimuth correction coefficient of the photovoltaic array, K3 is the availability of the photovoltaic power generation system, K4 is the light utilization rate, K5 is the inverter efficiency, K6 is the collection line and step-up transformer loss correction coefficient, K7 is the solar module surface contamination correction coefficient, and K8 is the solar module conversion efficiency correction coefficient.

[0024] The present invention discloses a multi-station integrated substation, which integrates multiple functional units such as a substation, a power station, a charging station and a data center:

[0025] Substation is the core part of the power system, mainly used for transforming voltage level, collecting and distributing electric energy. In this multi-station integrated substation: Substation includes the following key equipment: 110kV indoor GIS equipment: GIS is a gas-insulated switch station, which uses SF6 gas as the insulating medium. It has the advantages of small footprint, simple operation and maintenance, and strong environmental adaptability. 110kV indoor GIS equipment can ensure the safe transmission and distribution of high-voltage electric energy;

[0026] 35kV indoor gas-filled cabinet: The gas-filled cabinet is a switchgear that uses air or inert gas as the insulating medium. It has the characteristics of compact structure, flexible operation, safety and reliability. The 35kV indoor gas-filled cabinet is used for the distribution and transmission of medium-voltage electric energy.

[0027] 10kV switchgear: Switchgear is an electrical device used to connect, disconnect, convert and protect circuits in power systems. 10kV switchgear is widely used in low-voltage power distribution systems and has the advantages of easy operation and reliable performance.

[0028] Main transformer: The transformer is one of the most important equipment in the substation. It is responsible for converting high-voltage electricity into low-voltage electricity to meet the electricity needs of different users. In a multi-station integrated substation, the main transformer is the key equipment connecting the high-voltage and medium-voltage power grids.

[0029] 10kV capacitor: Capacitors are used to compensate for reactive power in the system and improve the quality of power. In multi-station integrated substations, 10kV capacitors can ensure the stable operation of the power grid;

[0030] 35kV arc suppression coil equipment: Arc suppression coil is an electrical device used for neutral point grounding of power system. It is mainly used to eliminate the arc generated by single-phase grounding fault. 35kV arc suppression coil equipment can reduce the fault rate of power grid and improve the reliability of power grid;

[0031] The power station uses a photovoltaic microgrid system to provide power for the power loads such as the air conditioning power in the secondary equipment room. The photovoltaic microgrid system has the following characteristics: the photovoltaic microgrid system is composed of distributed power sources (such as photovoltaic cells), which are distributed in every corner of the power grid and can provide reliable power support;

[0032] The charging station includes an integrated DC charging pile, which is used for vehicle charging and charging operation requirements for fire fighting and equipment transportation. The integrated DC charging pile adopts efficient charging technology and can quickly charge charging equipment such as electric vehicles;

[0033] The data center is responsible for processing and analyzing data transmitted by substations, power stations, and charging stations. The data center includes cabinets for installing network equipment, servers and other hardware equipment to provide physical support for the data center; network equipment (such as switches, routers, etc.) is used to achieve communication and data transmission between devices within the data center; the server is the core equipment of the data center and is used to store and process data. In a multi-station integrated substation, the server can receive and process data from substations, power stations, and charging stations in real time; the processor and memory are key components of the server and are used to perform data processing and storage tasks. In a multi-station integrated substation, the processor and memory need to have high performance and reliability to ensure the real-time and accuracy of the data;

[0034] In summary, the design based on multi-station integrated substation combines multiple functional units such as substation, power station, charging station and data center, realizing efficient transmission, distribution and utilization of electric energy. This design not only improves the stability and reliability of the power grid, but also promotes the full utilization of clean energy and the popularization of new energy vehicles, realizes efficient utilization of resources, and avoids duplicate construction and waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A construction drawing of a specific implementation mode of the present invention;

[0036] Figure 2 A perspective view of the present invention;

[0037] Figure 3 for Figure 2 Top view of the . DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0039] like Figures 1 to 3 As shown, it shows a specific embodiment of the present invention: Figures 1 to 3 As shown, the present invention discloses a multi-station integrated substation, comprising:

[0040] Substation, used for transforming voltage level, collecting and distributing electric energy, including 110kV indoor GIS equipment, 35kV indoor gas-filled cabinet, 10kV switch cabinet, main transformer, 10kV capacitor, 35kV arc suppression coil equipment;

[0041] The power station uses a photovoltaic microgrid system to supply the power load of the air conditioning in the secondary equipment room;

[0042] Charging stations, including integrated DC charging piles, for vehicle charging and charging operation requirements for fire protection and equipment transportation;

[0043] Data centers process and analyze data transmitted from substations, power stations, and charging stations, including cabinets, network equipment, servers, processors, and storage.

[0044] Preferably, Figures 1 to 3As shown, the 110kV indoor GIS equipment is arranged in the 110kV distribution room, the 35kV indoor gas cabinet and the 10kV switch cabinet are arranged in the 35kV / 10kV high-voltage room, the main transformer is arranged outdoors, the 10kV capacitor is arranged in the capacitor room, and the 35kV arc suppression coil equipment is arranged in the 35kV arc suppression coil room.

[0045] The following is a detailed description of the specific layout of each device in a multi-station integrated substation:

[0046] 1.110kV indoor GIS equipment

[0047] Layout location: 110kV indoor GIS equipment is arranged in the 110kV distribution room. This layout ensures the safe operation of high-voltage equipment and is also conducive to the maintenance and management of the equipment.

[0048] 2.35kV indoor inflatable cabinet and 10kV switch cabinet

[0049] Layout location: 35kV indoor gas-filled cabinet and 10kV switch cabinet are arranged together in 35kV / 10kV high-voltage room. This layout is not only conducive to the centralized management of equipment, but also can improve the operation efficiency and reliability of the power grid.

[0050] 3. Main transformer

[0051] Layout location: The main transformer is arranged outdoors. This layout is conducive to the heat dissipation and ventilation of the transformer, and is also conducive to the maintenance and overhaul of the equipment.

[0052] 4.10kV capacitor

[0053] Layout location: 10kV capacitors are arranged in a dedicated capacitor room. This arrangement is conducive to the safe operation and centralized management of capacitors.

[0054] 5.35kV arc suppression coil equipment

[0055] Layout location: The 35kV arc suppression coil equipment is arranged in a special 35kV arc suppression coil room. This layout is conducive to the centralized management and maintenance of the equipment. The 35kV arc suppression coil equipment is mainly used to eliminate the arc generated by a single-phase grounding fault, reduce the power grid failure rate, and improve the reliability of the power grid. The equipment has the characteristics of simple structure, reliable operation, and convenient maintenance. At the same time, the arc suppression coil room is also equipped with corresponding monitoring and protection equipment to ensure the normal operation of the equipment.

[0056] In summary, the layout of each device in the multi-station integrated substation has been designed and considered on site to ensure the safe, stable and efficient operation of the power grid. At the same time, each device also has corresponding characteristics and protection measures to meet the power needs of different users and the operation requirements of the power grid.

[0057] Preferably, Figures 1 to 3 As shown, it also includes secondary equipment room, safety tool room, data room, fire water tank, pump room and auxiliary rooms.

[0058] The secondary equipment room is mainly used to place the secondary system equipment of the substation, such as protection devices, control devices, measuring devices, etc. The safety tool room is used to store various safety tools required for the substation, such as insulating rods, testers, grounding wires, etc. The data room is used to store various technical data and files of the substation. The fire water tank is one of the important fire protection facilities of the substation. The water pump room is mainly set up for the water supply of the fire protection system. The auxiliary room is a highly integrated building product that meets the production and living needs of the substation such as duty and power supply.

[0059] In summary, these rooms and facilities need to meet a series of strict requirements during design and use to ensure the safe, reliable and efficient operation of the substation.

[0060] Preferably, Figures 1 to 3 As shown, the integrated DC charging piles are provided in a plurality of units, and the number of charging parking spaces provided at the corresponding positions is twice the number of the integrated DC charging piles, and a charging carport is provided above the charging parking spaces.

[0061] The number of integrated DC charging piles should be designed according to the specific project site, which should be able to meet the charging needs of electric vehicles at present and in the future, while taking into account the maintenance, updating and scalability of the charging piles.

[0062] Quantity setting: To ensure that electric vehicles can charge smoothly, the number of charging parking spaces is set to twice the number of integrated DC charging piles. The main consideration is to make full use of resources (1 pile, 2 guns) for reasonable layout. At the same time, a certain safety distance should be maintained between charging parking spaces to prevent accidents such as collisions or fires during charging.

[0063] In order to provide shade and rain protection, the charging carport should be built with strong and durable materials, and be able to withstand certain natural forces such as wind pressure and snow pressure. At the same time, the design of the carport should take into account factors such as drainage and ventilation to prevent problems such as water accumulation and dust accumulation from affecting the normal use of charging piles and electric vehicles.

[0064] In order to improve the safety and convenience of the charging area, appropriate lighting equipment and surveillance cameras should be installed in the charging shed. The lighting equipment can provide sufficient light to facilitate the driver to perform charging operations at night or in low light conditions; the surveillance camera can monitor the situation in the charging area in real time to prevent theft, vandalism and other illegal acts.

[0065] In this 110kV substation project in the characteristic town of Nalati, Yili, a new charging station was built outside the substation wall according to the actual situation on site, including a new 630kVA box transformer and a new 400kVA box transformer, a new 10kV ring network cabinet, and 14 new charging parking spaces. The charging station is equipped with 7 120kW (1 pile and 2 guns) dual-charger chargers, which can meet the charging needs of small family cars and the fast charging needs of buses. It can provide charging services for 14 vehicles at the same time, including 4 charging parking spaces with a size of 4.5m×2.7m, 1 new communication cabinet, and 1 new lighting system.

[0066] Preferably, Figures 2-3 As shown, the photovoltaic microgrid system includes a solar cell module, a photovoltaic grid-connected inverter, an AC grid-connected distribution cabinet, and a mounting bracket. The solar cell module is connected to the photovoltaic grid-connected inverter by a connecting cable. The AC grid-connected distribution cabinet is arranged in the secondary equipment room. The outgoing line of the photovoltaic grid-connected inverter is laid to the access point AC grid-connected control cabinet, and is connected to the double-cut switch receiving end of the air-conditioning power distribution box in the secondary equipment room through the AC grid-connected control cabinet. The solar cell module is fixed on the top of the charging carport by a mounting bracket.

[0067] The photovoltaic microgrid system in this scheme is a small power system that uses solar cell modules to convert solar energy into electrical energy and transmits electrical energy:

[0068] 1. Solar cell module: This is the core part of the photovoltaic microgrid system, consisting of multiple solar cells that can absorb sunlight and convert it into DC electricity.

[0069] 2. Connecting cable: used to transmit the DC power generated by the solar cell module to the photovoltaic grid-connected inverter.

[0070] 3. Photovoltaic grid-connected inverter: This device converts the direct current generated by the solar cell module into alternating current so that it can be connected to the power grid or used by AC loads.

[0071] 4. AC grid-connected distribution cabinet: This is an electrical device used to control and protect the AC power output by the inverter, including circuit breakers, protection relays and other necessary control equipment.

[0072] 5. Mounting bracket: used to fix the solar cell modules to ensure that they can receive sunlight at the best angle. The solar cell modules are fixed to the top of the charging carport through the mounting bracket.

[0073] 6. AC grid-connected control cabinet: This is a control device used to manage the AC power output by the inverter and ensure that it is safely connected to the grid or local distribution system.

[0074] 7. Secondary equipment room: The room where the AC grid-connected distribution cabinet and other control equipment are set up needs to have proper ventilation and temperature control to protect the normal operation of the equipment.

[0075] 8. Air conditioning power distribution box double cut switch receiving end: This is the power distribution box connected to the air conditioning system. It can switch the power source through the double cut switch to ensure that the air conditioning system can continue to operate when the power grid is interrupted.

[0076] The working principle of the whole system is: the solar cell module absorbs sunlight and generates direct current, which is then transmitted to the photovoltaic grid-connected inverter through the connecting cable. The inverter converts the direct current into alternating current and is connected to the air-conditioning power distribution box through the AC grid-connected distribution cabinet and control cabinet, thereby providing power for the air-conditioning system. Such a system can not only reduce dependence on the traditional power grid, but also reduce energy costs and is environmentally friendly.

[0077] The photovoltaic microgrid system in this solution can have its own energy storage system. The solar cell converts solar energy into direct current, and the inverter converts direct current into alternating current to supply the load or grid. The energy storage battery stores and releases energy when the photovoltaic power generation is excessive or insufficient. It can improve energy utilization efficiency, solve the intermittent and instability problems of photovoltaic power generation, and achieve efficient utilization and stable output of energy. The energy storage system can provide backup power, frequency modulation and other grid services. It can achieve continuous power supply at night, increase output within the available power generation time, and improve grid flexibility.

[0078] The photovoltaic microgrid system in this solution can also be selected without an energy storage system, so that it can only generate electricity during the sunshine period, so it has no impact on the station transformer capacity. The station transformer capacity still needs to be considered according to the maximum power load of the entire station.

[0079] Preferably, the charging station also includes a billing control terminal for human-computer interaction, metering, card swiping, BMS communication, and control guidance. The billing control terminal includes a 9.7-inch touch screen, communicates with the station control system via RJ45, receives station control instructions, and sends the charging status to the station control system. The station control system is connected to the data center through a network.

[0080] As an important infrastructure for electric vehicle energy replenishment, the design of charging stations must not only consider charging efficiency and safety, but also the ease of operation. The charging control terminal module is used for autonomous charging and payment management. The charging control terminal provides users with an intuitive and easy-to-use operating interface through its 9.7-inch touch screen. Users can easily complete charging selection, payment operations, and check charging status through the prompts and menus on the screen, which improves the user's charging experience and reduces the difficulty of operation.

[0081] Metering function: The terminal has a built-in accurate metering module that can monitor and record key parameters such as power, voltage, current, etc. during the charging process in real time. These data not only provide users with detailed charging information, but also serve as an important basis for billing.

[0082] In order to facilitate users to pay charging fees, the billing control terminal usually supports multiple payment methods, including but not limited to card swiping (such as bank cards, bus cards, etc.), mobile payment (such as QR code scanning payment), etc. This makes the charging process more convenient and reduces the cumbersomeness of cash transactions.

[0083] BMS (Battery Management System) is an important part of electric vehicles, responsible for monitoring and managing the status of the battery pack. The billing control terminal can obtain real-time information such as the health status and remaining power of the battery through communication with the BMS, thereby ensuring the safety and efficiency of the charging process.

[0084] The terminal also has a control guidance function, that is, according to the information provided by the BMS and the user's charging needs, it intelligently adjusts the charging parameters (such as charging current, voltage, etc.) to achieve the best charging effect. This can not only protect the battery from damage, but also improve the charging efficiency.

[0085] The charging control terminal communicates with the station control system through the RJ45 interface. This connection method is not only stable and reliable, but also has a high data transmission rate. The terminal can receive instructions from the station control system, such as starting charging, stopping charging, etc., and send information such as charging status and fault alarm to the station control system in real time. In this way, the station control system can centrally manage and monitor all charging piles in the charging station.

[0086] As the management center of the charging station, the station control system is not only responsible for processing data and information from the billing control terminal, but also needs to be connected to the data center. The data center is the core of the operation and management of the charging station, responsible for data storage, analysis, processing, and remote monitoring. Through the network connection, the station control system can upload the real-time data of the charging station to the data center for management personnel to conduct remote analysis and decision-making. At the same time, the data center can also send instructions to the station control system to adjust the charging strategy, optimize resource allocation, etc.

[0087] In summary, the charging station realizes efficient, safe and intelligent charging services through the close collaboration of the billing control terminal, the station control system and the data center.

[0088] Preferably, the charging station also includes a video security monitoring system for monitoring the charging parking spaces.

[0089] The video security monitoring system should carry out effective video detection and monitoring, image display, recording and playback of chargers, charging parking spaces, major public activity venues, passages, important parts and areas that need to be monitored.

[0090] Preferably, Figures 2-3 As shown, the charging carport includes a carport and a metal frame, and the metal frame is connected downward to the grounding grid.

[0091] In the photovoltaic microgrid system, the lightning arrester and down conductor are important components of the lightning protection system. Their function is to safely guide the lightning current to the ground when lightning occurs to protect the photovoltaic system from damage. Lightning arrester: The canopy uses the metal scaffolding as a lightning arrester. Down conductor: The steel column of the canopy is used as a down conductor and connected to the grounding grid downward. The lightning protection device is treated with anti-corrosion at the welding point.

[0092] In the photovoltaic microgrid system, metal scaffolding can be used as lightning conductors to cover all photovoltaic modules and key equipment to ensure that they can effectively receive lightning strikes when lightning occurs. This can improve the lightning protection capability of the system without adding additional costs.

[0093] The down conductor is a conductor that connects the lightning receptor and the grounding grid. Its function is to guide the lightning current received by the lightning receptor to the grounding grid. In the photovoltaic microgrid system, the steel column of the canopy is used as the down conductor, so that the existing structure can be used to quickly and safely direct the lightning current to the ground, reducing material and construction costs.

[0094] Since the lightning protection device is exposed to the outdoors for a long time, it is susceptible to corrosion. Therefore, it is very important to carry out anti-corrosion treatment at the welding point to ensure the long-term stability and reliability of the lightning protection system. Anti-corrosion treatment can be done by painting, galvanizing or other anti-corrosion materials, so anti-corrosion treatment should be done on the welding points of the metal scaffolding.

[0095] Preferably, Figures 2-3 As shown, the solar cell module is a monocrystalline silicon cell module, and the specification is 540Wp. The number of monocrystalline silicon cell modules is 28, which are connected in series and in parallel to form a grid-connected power generation unit, and connected to a 380V AC power grid through a photovoltaic grid-connected inverter;

[0096] The solar cell assembly is installed at an inclination angle of 29 degrees.

[0097] This solution recommends the use of special mounting brackets to fix the photovoltaic modules on the top of the carport: laying a BAPV photovoltaic system, a total of 2×14 columns, using 540Wp photovoltaic panels, arranged on the top of the outdoor charging pile carport, the carport roof has a large usable area, the photovoltaic modules are arranged in a fixed manner with an angle, there are no buildings around the carport, and there will be no light blocking. The installation method is to install at a 29-degree angle, which is the best angle for the photovoltaic power generation system to generate a large amount of electricity throughout the year, and meets the requirements of dust, rain and snow sliding off and the angle range of the tilt bracket for better stability. According to the inverter configuration, the battery string is composed of 14 battery modules in series. The solar cell array consists of solar cell strings, converging equipment, and inverter equipment.

[0098] After being exposed to sunlight, the solar cell modules generate low-voltage direct current. The direct current after the battery modules are connected in series is led to the inverter through cables, and then connected to the station power panel after inversion.

[0099] Among them, the selection of solar cells is based on the mature manufacturing technology of existing single-crystal silicon and polycrystalline silicon solar cells, stable product performance, long service life, and relatively high photoelectric conversion efficiency. They are widely used in grid-connected photovoltaic power station projects. Due to their poor stability, relatively low photoelectric conversion efficiency, and relatively short service life, the application of amorphous silicon thin-film solar cells in megawatt-level solar photovoltaic power stations is subject to certain restrictions. Moreover, the domestic output of amorphous silicon thin-film solar cells is very small, and there is currently no large-scale production. The large-scale production of cadmium telluride and copper indium selenide batteries is limited due to the highly toxic or scarce raw materials. The main performance of each type of component is shown in Table 1:

[0100] Table 1:

[0101]

[0102] It can be seen from the above table that crystalline silicon solar cells are selected.

[0103] Crystalline silicon solar cell modules have many power specifications, ranging from 5Wp to 550Wp, and are produced by domestic manufacturers, and the products are also widely used. The price of monocrystalline silicon is about 0.2 yuan per watt more expensive than polycrystalline silicon, and the conversion efficiency is slightly higher than that of polycrystalline silicon. Considering the mainstream products in the current photovoltaic market, high conversion efficiency, and slow attenuation effect, it is suitable to promote the module models suitable for large photovoltaic power stations. After a large number of market surveys on various types of modules, amorphous silicon thin-film batteries have a faster attenuation effect, low conversion efficiency, and a large footprint, and currently have no obvious price advantage. Taking the above factors into consideration, this project intends to use monocrystalline silicon solar cell modules.

[0104] At present, as the power of the single cells that make up the crystalline silicon photovoltaic modules increases, the power density and efficiency of the modules are gradually increasing. At present, the mainstream level of the conventional 60-cell monocrystalline silicon modules in China is 285-350Wp, and the mainstream level of the 72-cell monocrystalline silicon modules is 340-550Wp. Since the capacity of this project is large, the amount of solar cell modules is large, and the installation area is limited, the design gives priority to the use of solar cell modules with high power per unit area to reduce the installation area and reduce the amount of module installation.

[0105] The power generation capacity of this scheme is 15.12kWp. Compared with the common ground-mounted photovoltaic, the amount of photovoltaic modules installed is small, so large-capacity photovoltaic modules should be used first to reduce the floor space and increase the installed capacity. In addition, through market research, the power generation efficiency of monocrystalline silicon modules is slightly higher than that of polycrystalline silicon, and the production efficiency of monocrystalline silicon has been gradually improving in recent years. The specifications of monocrystalline silicon modules produced by several manufacturers with relatively high market share are mostly 540Wp. Taking into account the efficiency of modules, technical maturity, market share and the options available when purchasing and ordering, combined with the advantages and disadvantages of various solar cell modules, the solar modules in this scheme are planned to use 540Wp monocrystalline silicon modules.

[0106] Preferably, the power generation calculation formula of the power station is: E p =H A ×P AZ ×K, where H A is the total solar radiation on the horizontal surface, P AZ is the installed capacity of solar cell modules, K is the comprehensive efficiency coefficient;

[0107] Among them, K = K1×K2×K3×K4×K5×K6×K7×K8, where K1 is the component type correction coefficient, K2 is the inclination and azimuth correction coefficient of the photovoltaic array, K3 is the availability of the photovoltaic power generation system, K4 is the light utilization rate, K5 is the inverter efficiency, K6 is the collection line and step-up transformer loss correction coefficient, K7 is the solar module surface contamination correction coefficient, and K8 is the solar module conversion efficiency correction coefficient.

[0108] According to the composition of the photovoltaic power generation system and the photoelectric conversion characteristics of photovoltaic modules, the power generation of the power station depends on the total solar radiation and the conversion efficiency of the inverter, and is also affected by many factors. The comprehensive efficiency coefficient K is a comprehensive photoelectric conversion efficiency after considering various factors including: photovoltaic module type, photovoltaic array inclination, azimuth, photovoltaic power generation system availability, light utilization, inverter efficiency, collection line loss, step-up transformer loss, photovoltaic module surface contamination, photovoltaic module conversion efficiency deviation, etc.

[0109] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention. These changes involve related technologies well known to those skilled in the art, which all fall within the scope of protection of the patent of the present invention.

[0110] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A multi-station fusion substation, characterized in that: include: Substation, used for transforming voltage level, collecting and distributing electric energy, including 110kV indoor GIS equipment, 35kV indoor gas-filled cabinet, 10kV switch cabinet, main transformer, 10kV capacitor, 35kV arc suppression coil equipment; The power station uses a photovoltaic microgrid system to supply the power load of the air conditioning in the secondary equipment room; Charging stations, including integrated DC charging piles, for vehicle charging and charging operation requirements for fire protection and equipment transportation; Data centers process and analyze data transmitted from substations, power stations, and charging stations, including cabinets, network equipment, servers, processors, and storage.

2. A multi-station fusion substation according to claim 1, characterized in that: The 110kV indoor GIS equipment is arranged in the 110kV distribution room, the 35kV indoor gas cabinet and the 10kV switch cabinet are arranged in the 35kV / 10kV high-voltage room, the main transformer is arranged outdoors, the 10kV capacitor is arranged in the capacitor room, and the 35kV arc suppression coil equipment is arranged in the 35kV arc suppression coil room.

3. A multi-station fusion substation according to claim 2, characterized in that: It also includes secondary equipment room, safety tool room, data room, fire water tank, pump room and auxiliary rooms.

4. A multi-station fusion substation according to any one of claims 1 to 3, characterized in that: The integrated DC charging piles are provided in a plurality of units, and the number of charging parking spaces provided at the corresponding positions thereof is twice the number of the integrated DC charging piles, and a charging carport is provided above the charging parking spaces.

5. A multi-station fusion substation according to claim 4, characterized in that: The photovoltaic microgrid system includes a solar cell module, a photovoltaic grid-connected inverter, an AC grid-connected distribution cabinet, and a mounting bracket. The solar cell module is connected to the photovoltaic grid-connected inverter using a connecting cable. The AC grid-connected distribution cabinet is arranged in the secondary equipment room. The outgoing line of the photovoltaic grid-connected inverter is laid to the access point AC grid-connected control cabinet, and is connected to the double-cut switch receiving end of the air-conditioning power distribution box in the secondary equipment room through the AC grid-connected control cabinet. The solar cell module is fixed to the top of the charging carport through a mounting bracket.

6. A multi-station fusion substation according to claim 5, characterized in that: The charging station also includes a billing control terminal for human-computer interaction, metering, card swiping, BMS communication, and control guidance. The billing control terminal includes a 9.7-inch touch screen, which communicates with the station control system via RJ45, receives station control instructions, and sends the charging status to the station control system. The station control system is connected to the data center through a network.

7. A multi-station integrated substation according to any one of claim 6, characterized in that: The charging station also includes a video security monitoring system for monitoring the charging parking spaces.

8. The multi-station integrated substation according to claim 7 is characterized in that: The charging carport comprises a carport and a metal frame, and the metal frame is downwardly connected to a grounding grid.

9. A multi-station integrated substation according to claim 5 or 8, characterized in that: The solar cell module is a monocrystalline silicon cell module, and the specification is 540Wp. The number of the monocrystalline silicon cell modules is 28, which are connected in series and in parallel to form a grid-connected power generation unit, and connected to a 380V AC power grid through a photovoltaic grid-connected inverter; The solar cell assembly is installed at an inclination angle of 29 degrees.

10. A multi-station integrated substation according to claim 9, characterized in that: The power generation calculation formula of the power station is: E p =H A ×P AZ ×K, where H A is the total solar radiation on the horizontal surface, P AZ is the installed capacity of solar cell modules, K is the comprehensive efficiency coefficient; Among them, K = K1×K2×K3×K4×K5×K6×K7×K8, where K1 is the component type correction coefficient, K2 is the inclination and azimuth correction coefficient of the photovoltaic array, K3 is the availability of the photovoltaic power generation system, K4 is the light utilization rate, K5 is the inverter efficiency, K6 is the collection line and step-up transformer loss correction coefficient, K7 is the solar module surface contamination correction coefficient, and K8 is the solar module conversion efficiency correction coefficient.

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