Solar photovoltaic power generation device

Abstract

The utility model relates to the technical field of photovoltaic power generation, and discloses a solar photovoltaic power generation device. The technical problem that in the prior art, a traditional solar cell panel is low in photoelectric conversion efficiency, and consequently the generating capacity is insufficient is solved. The device comprises a solar cell array which is arranged on a roof of a building in a tiled manner so as to receive sunlight irradiation to generate low-voltage direct current, the electric energy output end of the solar cell array is connected with an inverter through a cable so as to convert the direct current into three-phase alternating current, and the alternating current output end of the inverter is connected with a boosting transformer through a cable so as to convert the three-phase alternating current into three-phase alternating current. The high-voltage side of the boosting transformer is connected into the prefabricated cabin and the switching station through a cable line, and the switching station is connected with a power distribution network through a line. According to the utility model, the photoelectric conversion efficiency is improved, the flexibility and expandability are enhanced, the safety is improved, the real-time monitoring and maintenance are convenient, the construction period is shortened, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field especially relates to a solar photovoltaic power generation device. BACKGROUND

[0002] Renewable energy refers to wind energy, solar energy, water energy, biomass energy, geothermal energy, ocean energy and other non-fossil energy, which is basically directly or indirectly from solar energy, and has the characteristics of clean, high efficiency, environmental protection, energy saving, economy and the like. Solar energy resources have the advantages of inexhaustible, inexhaustible, no pollution to the environment, no destruction to the ecology, wide distribution, and local availability, and have broad application prospects. Photovoltaic power generation is a clean renewable energy without air, water pollution problems and waste residue stacking problems. The main energy consumption of photovoltaic power generation field during operation is the loss of power collection line and electrical equipment and the consumption of production power consumption, and the main energy consumption of construction period is the consumption of construction equipment power, oil and water, and at the same time, it does not release pollutants, waste materials, and does not produce greenhouse gases to destroy the atmosphere, and does not have problems such as waste residue stacking and wastewater discharge, which is conducive to protecting the surrounding environment, and is a green renewable energy. In addition, it can save water and reduce the pollution of corresponding wastewater and warm water to the water environment. As can be seen, the roof photovoltaic power generation project has obvious environmental benefits, and is a clean energy development and utilization project, which utilizes idle roof and does not occupy land. It meets the requirements of China's energy industry policy, local overall development plan and environmental protection, has obvious economic, social and environmental benefits, and the construction of photovoltaic power station has little impact on the environment, which is a basic construction project with hundred benefits and no harm.

[0003] The prior art Chinese patent document 201610649558.1 discloses a solar photovoltaic power generation device, which comprises a solar power generation assembly, the solar power generation assembly is arranged on the east-west longitudinal support through a rotating shaft, and the solar power generation assembly is rotated to the two sides of the east-west longitudinal support through the rotating shaft. At least one side of the east-west longitudinal support is provided with a driving member; the solar power generation assembly comprises a plurality of front and rear connected power generation units; each power generation unit comprises a photovoltaic module for converting light energy into electrical energy; a support device for supporting the photovoltaic module, the power generation units are connected through the support device; the photovoltaic module is arranged on the support device and can rotate in the east-west direction, and the photovoltaic module of each power generation unit is connected with a driving mechanism for synchronous rotation.

[0004] However, the above-mentioned scheme has at least the following technical problems in the implementation process: the traditional solar cell panel has low photoelectric conversion efficiency, resulting in insufficient power generation. Therefore, it is urgent to propose a solar photovoltaic power generation device. SUMMARY

[0005] In view of the above technical problems, the present disclosure provides a solar photovoltaic power generation device, which solves the technical problem of low photoelectric conversion efficiency of traditional solar cell panels in the prior art, resulting in insufficient power generation.

[0006] According to one aspect of the present disclosure, a solar photovoltaic power generation device is provided, which includes a solar cell array installed flatly on a building roof to generate low-voltage direct current by receiving sunlight, an electrical energy output end of the solar cell array being connected to an inverter through a cable to convert the direct current into three-phase alternating current, an alternating current output end of the inverter being connected to a step-up transformer through a cable, a high-voltage side of the step-up transformer being connected to a prefabricated cabin and a switching station through a cable line, and the switching station being connected to a power distribution network through a line.

[0007] In some embodiments of the present disclosure, the solar cell array includes a PERC single-sided crystalline silicon cell, the PERC single-sided crystalline silicon cell including a silicon wafer, a back surface of the silicon wafer being plated with a layer of Al2O3 film, the Al2O3 film being covered with a layer of SiNx film, and the back surface of the silicon wafer being provided with a groove hole penetrating through the Al2O3 film and the SiNx film.

[0008] In some embodiments of the present disclosure, the PERC single-sided crystalline silicon cells are connected in series, and 16-26 PERC single-sided crystalline silicon cells are connected in series as one branch. The inverter includes a string inverter, and 10-18 branches are connected to one 196 kW string inverter, and 5-7 string inverters are connected to one step-up transformer.

[0009] In some embodiments of the present disclosure, the building roof is provided with a lightning protection belt, a frame of the solar cell array is metal and connected to a grounding grid through a support, the grounding grid includes galvanized grounding flat steel or galvanized grounding angle steel, a metal shell of the step-up transformer is grounded, and lightning arresters are arranged in the inverter and the step-up transformer.

[0010] In some embodiments of the present disclosure, a photovoltaic monitoring assembly is arranged in the switching station, the photovoltaic monitoring assembly includes an industrial computer, an output end of the industrial computer being connected to a screen monitor and a voice alarm sound; an input end of the industrial computer being connected to inverter monitoring equipment and step-up transformer monitoring equipment, and the monitoring equipment includes a camera installed on a vertical rod.

[0011] In some embodiments of the present disclosure, a fire alarm assembly is further included, the fire alarm assembly includes a fire alarm controller, an input end of the fire alarm controller being connected to a temperature and smoke detector and a manual alarm button, and an output end of the fire alarm controller being connected to a sound and light alarm; the fire alarm controller is arranged in the switching station; the sound and light alarm and the manual alarm button are arranged in the prefabricated cabin; and the temperature and smoke detectors are uniformly arranged at cable dense parts.

[0012] In some embodiments of the present disclosure, a power supply assembly is further included, the power supply assembly comprising an alternating current power supply and a direct current power supply, the alternating current power supply comprising a 380V alternating current power supply cabinet arranged in the prefabricated cabin.

[0013] In some embodiments of the present disclosure, the direct current power supply comprises a UPS power supply, an electrical energy output of the UPS power supply being connected with a photovoltaic monitoring assembly and a fire alarm assembly, and a power supply end of the UPS power supply being connected with a 220V battery pack.

[0014] The present utility model has the advantages of:

[0015] 1. The PERC single-sided crystalline silicon cell is plated with Al2O3 film and SiNx film on the back, which can effectively reduce electron recombination, improve carrier lifetime, and thus improve photoelectric conversion efficiency; the design of the slot hole further enhances the local back electric field effect and improves the overall performance of the cell.

[0016] 2. Each 16-26 PERC single-sided crystalline silicon cells are connected in series to form a branch, and a high-efficiency power generation unit is formed, which can maximize the use of sunlight and generate stable DC output.

[0017] 3. Each 10-18 branches is connected to one group string inverter, and each 5-7 group string inverters is connected to one step-up transformer, making the system more flexible and easy to expand and maintain.

[0018] 4. The solar cell array is installed on the roof of the building, which is suitable for various roof structures and reduces the installation difficulty and cost.

[0019] 5. The lightning belt is arranged on the roof of the building, the solar cell array frame is grounded, the metal shell of the step-up transformer is grounded, and lightning arresters are arranged in the inverter and the step-up transformer, which ensures the safe operation in rainy weather.

[0020] 6. The grounding grid is laid with hot-dipped galvanized flat steel or angle steel, which improves the overall grounding performance of the system and reduces the risk of electrical failure.

[0021] 7. The industrial computer is arranged in the switch station to monitor the working state of the inverter and the step-up transformer in real time, and the working state is displayed and alarmed through the screen monitor and voice alarm sound; the video camera installed on the stand provides video monitoring, enhancing the visual management capability of the system.

[0022] 8. The fire alarm controller is connected with the temperature and smoke detector, the manual alarm button and the sound and light alarm, which can timely discover and handle fire hazards and ensure the fire safety of the system.

[0023] 9.380V AC power supply cabinet is arranged in prefabricated cabin, provides stable AC power supply for system, UPS power supply connects photovoltaic monitoring assembly and fire alarm assembly, and is powered by 220V battery pack, ensures that critical equipment can still operate normally when power grid is powered off. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a structural schematic diagram of solar photovoltaic power generation device;

[0025] Fig. 2 It is a structural block diagram of solar photovoltaic power generation device;

[0026] Fig. 3 It is a structural block diagram of photovoltaic monitoring assembly;

[0027] Fig. 4 It is a structural block diagram of fire alarm assembly;

[0028] Names of components in the figure: 1, solar cell array;2, support. DETAILED DESCRIPTION

[0029] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model. Example 1

[0030] This example discloses a solar photovoltaic power generation device, referring to Figs. 1 to 4 ,

[0031] The solar cell array 1 is installed on the roof of the building in a flat manner to generate low-voltage direct current by receiving sunlight, and the power output end of the solar cell array is connected to an inverter through a cable to convert the direct current into three-phase alternating current. The alternating current output end of the inverter is connected to a step-up transformer through a cable, and the high-voltage side of the step-up transformer is connected to a prefabricated cabin and a switch station through a cable line. The switch station line is connected to a power distribution network.

[0032] The solar cell array includes a PERC single-sided crystalline silicon cell, the PERC single-sided crystalline silicon cell includes a silicon wafer, the back surface of the silicon wafer is plated with an Al2O3 film, the Al2O3 film is covered with an SiNx film, and the back surface of the silicon wafer is provided with a groove hole, and the groove hole penetrates through the Al2O3 film and the SiNx film.

[0033] The PERC single-sided crystalline silicon cells are connected in series, and every 16-26 PERC single-sided crystalline silicon cells are connected in series as a branch. The inverter includes a group string inverter, every 10-18 branches are connected to a 196kW group string inverter, and every 5-7 group string inverters are connected to a step-up transformer.

[0034] The building roof is provided with a lightning belt, the solar cell array frame is metal, connected to a grounding net through a support 2, the grounding net includes galvanized grounding flat steel or galvanized grounding angle steel, the booster transformer metal shell is grounded, and the inverter and the booster transformer are both provided with lightning arresters.

[0035] A photovoltaic monitoring assembly is arranged in the switch station, the photovoltaic monitoring assembly includes an industrial computer, an output end of the industrial computer is connected to a screen monitor and a voice alarm sound, a signal input end of the industrial computer is connected to an inverter monitoring device and a booster transformer monitoring device, and the monitoring device includes a camera installed on a vertical rod.

[0036] The switch station is also provided with a fire alarm assembly, the fire alarm assembly includes a fire alarm controller, a signal input end of the fire alarm controller is connected to a temperature and smoke sensor and a manual alarm button, a signal output end of the fire alarm controller is connected to an audible and visual alarm, the fire alarm controller is arranged in the switch station, the audible and visual alarm and the manual alarm button are arranged in the prefabricated cabin, and the temperature and smoke sensor is uniformly arranged at a cable dense position.

[0037] The switch station is also provided with a power supply assembly, the power supply assembly includes an alternating current power supply and a direct current power supply, the alternating current power supply includes a 380V alternating current power supply cabinet arranged in the prefabricated cabin.

[0038] The direct current power supply includes a UPS power supply, an electric energy output of the UPS power supply is connected to the photovoltaic monitoring assembly and the fire alarm assembly, and a power supply end of the UPS power supply is connected to a 220V battery pack.

[0039] During operation, the PERC single-side crystalline silicon cells installed flat on the roof of the building receive sunlight and generate low-voltage direct current. Each 16-26 PERC single-side crystalline silicon cells are connected in series to form a branch, which is an efficient power generation unit. The direct current of each branch is connected to a string inverter through a cable, which converts the direct current into three-phase alternating current. Each 10-18 branches are connected to a 196kW string inverter. The alternating current output by the inverter is connected to a step-up transformer through a cable, which increases the voltage from low voltage (e.g. 0.8kV) to high voltage (e.g. 10kV). The high voltage after the step-up is connected to a switch station in the prefabricated cabin through a cable line, and then connected to the power distribution network through the switch station line to realize grid connection. A layer of Al2O3 film is plated on the back of the silicon wafer, and a layer of SiNx film is covered on the Al2O3 film to reduce electron recombination and improve carrier lifetime. The back of the silicon wafer is provided with a groove hole to enhance the local back electric field effect. A lightning belt is arranged on the roof of the building to prevent lightning damage to the system. The frame of the solar cell array is metal, which is connected to the grounding network through the support, and the grounding network includes hot-dipped galvanized grounding flat steel or hot-dipped galvanized angle steel to ensure good grounding performance. Lightning arresters are arranged in the inverter and the step-up transformer to further improve the lightning protection capability of the system. An industrial control computer monitors the working state of the inverter and the step-up transformer in real time, and displays and alarms through a screen monitor and a voice alarm sound. A camera installed on a vertical rod provides video monitoring to enhance the visual management capability of the system. A fire alarm controller ensures that fire hazards are detected in time. A 380V AC power supply cabinet is arranged in the prefabricated cabin to provide stable AC power supply for the system. An UPS power supply connects the photovoltaic monitoring assembly and the fire alarm assembly to ensure that the key equipment can still operate normally when the power grid is powered off. The power supply end of the UPS power supply is connected to a 220V battery pack to provide backup power.

[0040] Although some preferred embodiments of the present application have been described, those skilled in the art who have the basic inventive concept can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0041] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A solar photovoltaic power generation device, characterized by: The application relates to a solar cell array arranged on the roof of a building in a flat manner to receive sunlight and generate low-voltage direct current, the power output end of the solar cell array is connected to an inverter through a cable to convert the direct current into three-phase alternating current, the alternating current output end of the inverter is connected to a step-up transformer through a cable, the high-voltage side of the step-up transformer is connected to a prefabricated cabin and a switching station through a cable line, and the switching station is connected to a power distribution network through a line.

2. The solar photovoltaic power device of claim 1, wherein: The solar cell array comprises PERC single-sided crystalline silicon cells, the PERC single-sided crystalline silicon cell comprises a silicon wafer, the back surface of the silicon wafer is plated with an Al2O3 film, the Al2O3 film is covered with a SiNx film, and a groove hole is formed on the back surface of the silicon wafer and penetrates through the Al2O3 film and the SiNx film.

3. The solar photovoltaic power device of claim 2, wherein: The PERC single-sided crystalline silicon cells are connected in series, 16-26 PERC single-sided crystalline silicon cells are connected in series to form a branch, the inverter comprises a string inverter, 10-18 branches are connected to a 196kW string inverter, and 5-7 string inverters are connected to a step-up transformer.

4. The solar photovoltaic power device of claim 1, wherein: The roof of the building is provided with a lightning strip, the frame of the solar cell array is metal and connected to a grounding grid through a support, the grounding grid comprises galvanized grounding flat steel or galvanized angle steel, the metal shell of the step-up transformer is grounded, and lightning arresters are arranged in the inverter and the step-up transformer.

5. The solar photovoltaic power device of claim 1, wherein: The application further comprises a power supply assembly, the power supply assembly comprises an alternating current power supply and a direct current power supply, the alternating current power supply comprises a 380V alternating current power supply cabinet and is arranged in the prefabricated cabin.

6. The solar photovoltaic power device of claim 5, wherein: The direct current power supply comprises a UPS power supply, and the power supply end of the UPS power supply is connected to a 220V storage battery.

7. The solar photovoltaic power device of claim 6, wherein: A photovoltaic monitoring assembly is arranged in the switching station, the power output end of the UPS power supply is connected to the photovoltaic monitoring assembly, the photovoltaic monitoring assembly comprises an industrial computer, the output end of the industrial computer is connected to a screen monitor and a voice alarm sounder, the signal input end of the industrial computer is connected to inverter monitoring equipment and step-up transformer monitoring equipment, and the monitoring equipment comprises a camera installed on a vertical rod.

8. The solar photovoltaic power device of claim 6, wherein: The power output end of the UPS power supply is connected to a fire alarm assembly, the fire alarm assembly comprises a fire alarm controller, the signal input end of the fire alarm controller is connected to a temperature and smoke detector and a manual alarm button, the signal output end is connected to an audible and visual alarm, and the fire alarm controller is arranged in the switching station; the audible and visual alarm and the manual alarm button are arranged in the prefabricated cabin; and the temperature and smoke detectors are uniformly arranged at cable dense positions.

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