Electroluminescent snow melting device for photovoltaic power generation field

Abstract

The utility model provides an electroluminescent snow melting device for a photovoltaic power generation field. The electroluminescent snow melting device comprises a direct-current constant-current source, an original combiner box, a bridging circuit assembly, a photovoltaic circuit assembly and a plurality of original photovoltaic assemblies, the original photovoltaic module is connected with the original combiner box to form an original photovoltaic power generation circuit; the bridging circuit assembly comprises a bridging circuit, a first diode and a second diode, the first end of the bridging circuit is connected to the output side of the original combiner box, the second end of the bridging circuit is connected to the input side of the original combiner box, and the first diode is arranged at the output end of the original combiner box to prevent current from reversely flowing to the original combiner box; the second diode is arranged on the bridging circuit and restricts the current to be conducted from the first end to the second end in a one-way mode; the first end of the bridging circuit is connected to the direct-current constant-current source, and snow melting is carried out through the electroluminescence reaction of the original photovoltaic module. The device has the advantages that manual or mechanical equipment investment is not needed, intervention of cleaning agents and water is reduced, and then the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy engineering field, specifically speaking, relate to a photovoltaic power station electroluminescent snow melting device. BACKGROUND

[0002] Now some photovoltaic module snow melting adopts natural thawing, cleaning agent cleaning, high pressure water gun flushing, manual removal and the like.

[0003] Among them, the natural thawing mode is too dependent on the weather, if the weather is unstable for a long time, the power generation power is influenced, and the equipment may be frozen.

[0004] Cleaning agent cleaning often needs to lay pipelines and supports and the like, and the laying cost is too high.

[0005] High pressure water gun flushing is usually combined with special cleaning vehicles or simply manually operated to clean, when the area of photovoltaic station is large, the number of distributed photovoltaic modules is large, and the time consumption of manual or flushing water gun flushing and the like is usually long, which is not conducive to daily maintenance.

[0006] At present, there is a way of heat generation in the electroluminescent process of photovoltaic module to melt snow, but its circuit is set according to the separately laid circuit, which is still too large from the workload, and is not conducive to popularization and application.

[0007] The above-mentioned ways all have different degrees of inconvenience, therefore, it is necessary to optimize the existing photovoltaic snow melting work. UTILITY MODEL CONTENT

[0008] The utility model aims at the shortage of prior art, and provides a photovoltaic power station electroluminescent snow melting device which does not need manual or mechanical equipment investment, reduces the intervention of cleaning agent and water and reduces the cost.

[0009] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme that a photovoltaic power station electroluminescent snow melting device, comprising a direct current constant current source, a former bus box or inverter, a bridging circuit component, a photovoltaic circuit component and a plurality of original photovoltaic modules.

[0010] The original photovoltaic module is connected with the former bus box or inverter to form an original photovoltaic power generation circuit.

[0011] The bridging circuit component comprises a bridging circuit, a first diode and a second diode, the first end of the bridging circuit is connected to the output side of the former bus box or inverter, the second end is connected to the input side of the former bus box or inverter, the first diode is arranged at the output end of the former bus box or inverter to prevent the reverse flow of current to the former bus box or inverter, and the second diode is arranged on the bridging circuit and restricts the unidirectional conduction of current from the first end to the second end.

[0012] The first end of the bridging circuit is connected to a direct current constant current source, for supplying power to the original photovoltaic modules in reverse through the bridging circuit, to stimulate the electroluminescence reaction of the original photovoltaic modules to melt snow.

[0013] Preferably, the direct current constant current source is a direct current power supply.

[0014] Preferably, the direct current constant current source comprises a photovoltaic energy storage station and a box inverter integrated machine, for converting alternating current into direct current output.

[0015] Preferably, the box inverter integrated machine is internally provided with a forward bias power supply.

[0016] Preferably, the photovoltaic energy storage station supplies power to the box inverter integrated machine through a booster station and a power collection circuit.

[0017] Preferably, the bridging circuit assembly further comprises a photosensitive circuit breaker arranged on the bridging circuit.

[0018] Preferably, the bridging circuit assembly further comprises a rectifier arranged on the bridging circuit.

[0019] Preferably, the part of the circuit of the original photovoltaic module to the original combiner box or inverter and the circuit of the second end of the bridging circuit to the original photovoltaic module are arranged in a common line.

[0020] Preferably, the connection circuit of the photovoltaic energy storage station and the box inverter integrated machine to the original combiner box or inverter is arranged in a common line with the connection circuit of the first end of the bridging circuit to the photovoltaic energy storage station and the box inverter integrated machine.

[0021] Preferably, the maximum adjustable voltage of the direct current constant current source should not be lower than the open circuit voltage, and the maximum adjustable current should not be lower than the short circuit current.

[0022] The utility model discloses relative prior art has substantial characteristics and progress, specifically speaking, the utility model utilizes the principle that photovoltaic module has electroluminescence reaction, is component surface heating to ice and snow melt, and transforms with borrowing traditional photovoltaic power generation system, transforms with the original combiner box or inverter as bridging node, can avoid causing damage to the original combiner box or inverter in reverse power supply process.

[0023] The method is less transformed for the original photovoltaic power generation system, reduces manual input, can operate automatically under specific conditions, reduces the input of water, cleaning agent and mechanical equipment, improves the automation degree and efficiency of snow melting, and ensures that the photovoltaic module recovers the power generation capacity in time. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a circuit modification principle diagram of a photovoltaic power generation field electroluminescence snow melting device in the utility model

[0025] In the diagram: 1. DC constant current source; 2. Original combiner box or inverter; 3. Bridging circuit assembly; 4. Original photovoltaic module; 11. Box-inverter integrated unit; 12. Photovoltaic energy storage station; 31. Bridging circuit; 32. First diode; 33. Second diode; 34. Photosensitive circuit breaker; 35. Rectifier. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0027] like Figure 1 As shown, a photovoltaic power plant electroluminescent snow melting device includes a DC constant current source 1, an original combiner box or inverter 2, a bridging circuit assembly 3, and several original photovoltaic modules 4.

[0028] The original photovoltaic module 4 is connected to the original combiner box or inverter 2 to form the original photovoltaic power generation circuit. The photovoltaic module 4 absorbs solar energy and converts it into electrical energy, which is then transmitted to the original combiner box or inverter 2 for rectification, inversion and other processing, and then transmitted to downstream power equipment and energy storage equipment.

[0029] In this embodiment, the downstream equipment includes a box-type inverter unit 11 and a photovoltaic energy storage station 12.

[0030] The bridging circuit assembly 3 includes a bridging circuit 31, a first diode 32, and a second diode 33. The first end of the bridging circuit 31 is connected to the output side of the original combiner box or inverter 2, and the second end is connected to the input side of the original combiner box or inverter 2. The first diode 32 is disposed at the output end of the original combiner box or inverter 2 to prevent current from flowing back to the original combiner box or inverter 2. The second diode 33 is disposed on the bridging circuit 31 and constrains the current to conduct unidirectionally from the first end to the second end.

[0031] Specifically, during the retrofit, a first diode is installed at the lower end of the DC-DC fuse inside the original combiner box or string inverter. This first diode is a blocking diode. A bridging connection is made between the lower end of the first diode and the upper section of the component circuit fuse. A second diode, also a blocking diode, should be installed in the opposite direction on the bridging line to ensure that during the day, when the photovoltaic modules generate electricity, the current flows to the downstream inverter. At night, when the snow melting system is started, the current flows in the opposite direction to the photovoltaic modules through the circuit fuses of each component in the original combiner box or inverter 2, thereby causing an electroluminescent reaction.

[0032] In a preferred embodiment, to ensure the lifespan of the fuse, a photosensitive circuit breaker 34 can be added upstream of the bridging line 31 to ensure the safe operation of the system.

[0033] The first end of the bridging line 31 is connected to the direct current constant current source 1, for supplying reverse power to the original photovoltaic module 4 through the bridging line 31, to stimulate the electroluminescence reaction of the original photovoltaic module 4 to melt snow.

[0034] In the preferred embodiment, the road snow melting circuit can be powered separately, and a direct current power supply is configured.

[0035] In this embodiment, in order to maximize the use of existing photovoltaic systems, the direct current constant current source 1 includes a photovoltaic energy storage station 12 and a box inverter integrated machine 11, which is used to convert alternating current into direct current output.

[0036] The reason is that the electroluminescence reaction requires a direct current constant current source, and the output current and voltage range of the constant current power supply used in the detection should meet the test requirements of the photovoltaic module being tested.

[0037] Generally, the maximum adjustable voltage should not be lower than the open circuit voltage, and the maximum adjustable current should not be lower than the short circuit current. The power supply must be able to set 0.1 times to 1.0 times of the short circuit current (Isc). According to the characteristics of the existing centralized photovoltaic arrangement, the mode of the energy storage station sending power in reverse can be used to provide the constant current source. Since the distance of the farthest component in the photovoltaic field area energy storage station can reach more than 10 kilometers, in order to reduce the voltage drop and power loss, the energy storage system can be used to send power to the booster station at night, and then the booster station is used to send power to the power collection line in reverse to provide the constant current source. A rectifier 35 is arranged in front of the box inverter integrated machine 12 downstream of the photovoltaic array, which converts alternating current into direct current, and sends it to the junction box bridging circuit through the direct current cable, and then to the photovoltaic module.

[0038] In the preferred embodiment, the box inverter integrated machine is built-in with a forward bias power supply, which reduces the working pressure of the downstream rectifier 35 to a certain extent.

[0039] In the line design, in addition to the need to rewire the bridging line itself, the part of the line from the original photovoltaic module to the original junction box or inverter and the line from the second end of the bridging line to the original photovoltaic module are arranged in the same line; the connection line from the photovoltaic energy storage station and the box inverter integrated machine to the original junction box or inverter is arranged in the same line as the connection line from the first end of the bridging line to the photovoltaic energy storage station and the box inverter integrated machine.

[0040] In the wiring treatment downstream of the photovoltaic module, reverse power is supplied to the original positive and negative electrodes to meet the needs of the electroluminescence reaction.

[0041] The device stops running in the daytime, adopts an energy storage system to send power to the booster station at night, and then sends power to the power collection line from the booster station to provide a constant current source, and sets a rectifier in front of the inverter downstream of the photovoltaic array, converts alternating current to direct current through the rectifier, sends it to the busbar box through the DC side cable, and then to the photovoltaic module. By exciting electroluminescence reaction to generate heat, snow melting is carried out.

[0042] The modification scheme is based on the related experiments of the Fukang 60kW photovoltaic + 600,000kW•h energy storage project and the Liushuquan 25,000kW / 100,000kW•h network type energy storage supporting 1,000,000kW photovoltaic project. The photovoltaic project has a large area and a large number of pile foundations and component supports, which is very suitable for the use of a photovoltaic power plant electroluminescence snow melting system. The system is stable and has low investment. Through the implementation of the system, the snow removal capacity of large-area photovoltaic fields can be greatly improved.

[0043] Finally, it should be noted that: the above has made a detailed description of the preferred embodiment of the patent, but the patent is not limited to the above-mentioned embodiments, within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the patent.

Claims

1. A photovoltaic power plant electroluminescent de-icing device, characterized by: The direct current constant current source, the original bus box or inverter, the bridging line component, the photovoltaic line component and the original photovoltaic component are included. The original photovoltaic component is connected with the original bus box or inverter to form an original photovoltaic power generation circuit. The bridging line component includes a bridging line, a first diode and a second diode, the first end of the bridging line is connected to the output side of the original bus box or inverter, the second end is connected to the input side of the original bus box or inverter, the first diode is arranged at the output end of the original bus box or inverter to prevent the reverse flow of current to the original bus box or inverter, and the second diode is arranged on the bridging line and restricts the one-way conduction of current from the first end to the second end. The first end of the bridging line is connected to the direct current constant current source, which is used to supply power to the original photovoltaic component in the reverse direction through the bridging line to stimulate the electroluminescence reaction of the original photovoltaic component to melt snow.

2. The photovoltaic power plant electroluminescent de-icing device of claim 1, wherein: The direct current constant current source is a direct current power supply.

3. The photovoltaic power plant electroluminescent de-icing apparatus of claim 1, wherein: The direct current constant current source includes a photovoltaic energy storage station and a box inverter integrated machine, which is used to convert alternating current into direct current output.

4. The photovoltaic power plant electroluminescent de-icing device of claim 3, wherein: The box inverter integrated machine is built-in with a forward bias power supply.

5. The photovoltaic power plant electroluminescent de-icing device of claim 4, wherein: The photovoltaic energy storage station supplies power to the box inverter integrated machine through a booster station and a power collection line.

6. The photovoltaic power plant electroluminescent de-icing apparatus of claim 1, wherein: The bridging line component further includes a photosensitive circuit breaker arranged on the bridging line.

7. The photovoltaic power plant electroluminescent de-icing apparatus of claim 1, wherein: The bridging line component further includes a rectifier arranged on the bridging line.

8. The photovoltaic power plant electroluminescent de-icing apparatus of claim 1, wherein: The part of the line from the original photovoltaic component to the original bus box or inverter and the line from the second end of the bridging line to the original photovoltaic component are arranged in the same line.

9. The photovoltaic power plant electroluminescent de-icing apparatus of claim 3, wherein: The connection line from the photovoltaic energy storage station and the box inverter integrated machine to the original bus box or inverter is arranged in the same line with the connection line from the first end of the bridging line to the photovoltaic energy storage station and the box inverter integrated machine.

10. The photovoltaic power plant electroluminescent de-icing apparatus according to claim 1, wherein: The maximum adjustable voltage of the direct current constant current source should not be lower than the open circuit voltage, and the maximum adjustable current should not be lower than the short circuit current.

Images