A test device for underwater potential induced attenuation of photovoltaic modules

Abstract

The present invention relates to a test device for underwater potential induced attenuation of a photovoltaic module, comprising a shell and a water mist generating chamber and a test chamber arranged in the shell; the water mist generating chamber and the test chamber are separated by a porous partition; a water injection assembly, a water mist generating unit, and a water heating unit are arranged in the water mist generating chamber; a heating metal plate is arranged on the single-side lifting assembly, and the photovoltaic module is arranged on the heating metal plate; a test stand, a power module, and an electric meter unit are also arranged in the test chamber; the heating metal plate and the high voltage output unit are respectively connected to the power module, and the high voltage output unit is connected to the main grid line of the photovoltaic module to form a negative bias voltage application structure. Compared with the prior art, the present invention can simulate the specific operating conditions of the photovoltaic module, and only needs to monitor the change curve of the parallel resistance over time to analyze the attenuation of the battery cell, avoiding the complicated testing process in the prior art, and can efficiently adjust the humidity scene to meet the testing requirements.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic testing, and in particular to a testing device for underwater potential induced attenuation of a photovoltaic component. Background Art

[0002] As the cost of photovoltaic modules decreases, the development model of photovoltaic power stations has been greatly expanded. Among them, water photovoltaic power stations have become one of the most promising development directions for future photovoltaic power stations due to their low land cost and high environmental friendliness.

[0003] Water-based photovoltaic power stations usually have a large available space, and photovoltaic modules are generally connected in the form of long photovoltaic arrays, and the voltage at the array end can reach 1000 to 1500V. In addition, since the environment in which water-based photovoltaic power stations are located is generally humid, in certain application scenarios, there may even be a situation where the modules are immersed in water, and the environmental conditions are more complex than those of ground-based power stations. The high voltage and high humidity conditions make the photovoltaic modules in water-based photovoltaic power stations more susceptible to potential induced degradation. Since the testing standards and methods for photovoltaic modules used in water-based photovoltaic power stations are still in their infancy, there is no corresponding potential induced degradation test device in the industry. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a test device for underwater potential induced attenuation of photovoltaic modules. The device can simulate the specific operating conditions of photovoltaic modules and only needs to monitor the change curve of parallel resistance over time to analyze the attenuation of the battery cell, thus avoiding the complicated testing process in the prior art and efficiently adjusting the humidity scene to meet the testing requirements.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The test device for underwater potential induced attenuation of photovoltaic modules in the technical solution comprises a shell and a water mist generating chamber and a test chamber arranged in the shell;

[0007] The water mist generating chamber and the testing chamber are separated by a porous partition;

[0008] The water mist generating chamber is provided with a water injection assembly, a water mist generating unit and a water heating unit;

[0009] A unilateral lifting assembly is provided in the test cavity, a heating metal plate is provided on the unilateral lifting assembly, and the photovoltaic assembly is arranged on the heating metal plate, and the tilt posture of the photovoltaic assembly can be adjusted by unilateral lifting;

[0010] The test chamber is also provided with a test rack, a power module, and an electric meter unit;

[0011] The test stand is provided with a high voltage output unit;

[0012] The heating metal plate and the high voltage output unit are respectively connected to the power module, and the high voltage output unit is connected to the main grid line of the photovoltaic module to form a negative bias application structure;

[0013] A test resistor is also connected in parallel between the positive and negative ends of the photovoltaic module, and the ammeter unit measures the voltage value at both ends of the test resistor.

[0014] Furthermore, the power module includes a high voltage power supply, and can output a voltage of 50 to 2000V.

[0015] Furthermore, the photovoltaic module is a single solar cell or a combination of multiple solar cells.

[0016] Furthermore, one end or both ends of the heating metal plate are matched with a heater.

[0017] Further, the high voltage output unit is a sliding connector;

[0018] The test frame is fixed to the inner wall surface of the shell, and a slide rail is arranged on the lower surface of the test frame. The high voltage output unit is movably arranged on the slide rail and can perform linear displacement along the slide rail.

[0019] Furthermore, one end of the high voltage output unit is connected to the high voltage output unit through a wire, and the other end is provided with an elastic wire, one end of the elastic wire is provided with a clamping terminal, and the clamping terminal is connected to the main grid line of the photovoltaic module.

[0020] Furthermore, the electric meter unit is wirelessly connected to an external computer terminal.

[0021] Furthermore, the water injection assembly includes a solenoid valve and a water supply pump arranged on the water inlet of the water mist generating chamber, which can control the water level in the water mist generating chamber by injecting water flow, thereby controlling the distance between the water surface and the photovoltaic assembly;

[0022] A stirring paddle is also provided in the water mist generating chamber.

[0023] Furthermore, the single-sided lifting assembly includes a lifting electric cylinder and a support plate, one side of the support plate is hinged to the porous partition plate, and the output rod of the lifting electric cylinder is against the lower surface of the support plate.

[0024] Furthermore, a temperature sensor and a humidity sensor are also provided in the test cavity, and the temperature sensor and the humidity sensor are wirelessly connected to an external computer terminal.

[0025] Compared with the prior art, the present invention has the following technical advantages:

[0026] 1) In this technical solution, the photovoltaic module is first heated to a specific temperature by heating the metal plate. The heated metal plate simultaneously serves the purpose of heating and electrically connecting with the back electrode of the photovoltaic module. At the same time, the heating can also achieve cross-linking of the photovoltaic module film, so that the specific operating conditions of the photovoltaic module can be simulated. It is only necessary to monitor the change curve of the parallel resistance over time to analyze the attenuation of the battery cell, avoiding the complicated testing process in the prior art.

[0027] 2) This technical solution studies and establishes a device for potential induced attenuation of water photovoltaic modules. The water level in the water mist generating chamber is controlled by injecting water flow, thereby controlling the distance between the water surface and the photovoltaic modules. The humidity value in the test chamber is quickly adjusted through the water heating unit and the water mist generating unit, thereby efficiently adjusting the humidity scene to meet the test requirements.

[0028] 3) The setting posture of the photovoltaic assembly composed of the single-side lifting assembly in this technical solution is closer to the actual working state of the photovoltaic assembly, and the potential induced attenuation test can be carried out based on different tilt postures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the testing device for underwater potential induced attenuation of photovoltaic modules in this technical solution.

[0030] In the figure: 1. porous partition, 2. water mist generating unit, 3. water heating unit, 4. test frame, 5. power module, 6. test resistor, 7. high voltage output unit, 8. solenoid valve, 9. electric meter unit, 10. heating metal plate, 11. water supply pump, 12. lifting cylinder, 13. support plate, 14. temperature sensor, 16. humidity sensor, 17. baffle, 18. stirring paddle. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The test device for underwater potential induced attenuation of photovoltaic modules in this embodiment includes a housing 0 and a water mist generating chamber and a test chamber arranged in the housing 0, see Figure 1 When selecting materials, the housing 0 can be made of rigid polymer materials. The object tested in this technical solution is a photovoltaic module, which can be a single solar cell or a combination of multiple solar cells. A temperature sensor 14 and a humidity sensor 15 are also provided in the test chamber, and the temperature sensor 14 and the humidity sensor 15 are wirelessly connected to an external computer terminal.

[0033] The water mist generating chamber and the test chamber are separated by a porous partition 1, which plays a role of separation and support. The porous partition 1 is selected as a rigid plate with holes, and a plurality of small holes are arranged on the rigid plate to realize the entry of water or water vapor, which is extremely important for the regulation of humidity scenes.

[0034] A water injection assembly, a water mist generating unit 2 and a water heating unit 3 are arranged in the water mist generating chamber, wherein the water mist generating unit 2 is a humidifier.

[0035] A single-sided lifting assembly is provided in the test chamber, on which a heating metal plate 10 is provided, and the photovoltaic assembly is provided on the heating metal plate 10. The tilting posture of the photovoltaic assembly can be adjusted by single-sided lifting. The test chamber is also provided with a test frame 4, a power module 5, and an electric meter unit 9. The single-sided lifting assembly includes a lifting cylinder 12 and a support plate 13. One side of the support plate 13 is hinged to the porous partition plate 1, and at the same time, the output rod of the lifting cylinder 12 is against the lower surface of the support plate 13. Baffles are provided on both sides of the support plate 13, one end to prevent the photovoltaic assembly from sliding down, and the other end to prevent the end of the lifting cylinder 12 from separating from the support plate 13. The setting posture of the photovoltaic assembly formed by the single-sided lifting assembly is closer to the actual working state of the photovoltaic assembly, and the potential induced attenuation test can be performed based on different tilt postures.

[0036] The test stand 4 is provided with a high voltage output unit 7, the heating metal plate 10 and the high voltage output unit 7 are respectively connected to the power module 5, the high voltage output unit 7 is connected to the main grid line of the photovoltaic module, and a negative bias voltage application structure is formed; a test resistor 6 is also connected in parallel at both ends of the positive and negative electrodes of the photovoltaic module, and the electric meter unit 9 measures the voltage value at both ends of the test resistor 6. A heater is matched at one or both ends of the heating metal plate 10.

[0037] In the present technical solution, the photovoltaic module is first heated to a specific temperature by heating the metal plate 10. The heated metal plate 10 simultaneously serves the purpose of heating and electrically connecting with the back electrode of the photovoltaic module. At the same time, the heating can also realize the cross-linking of the photovoltaic module film. In this way, the specific operating conditions of the photovoltaic module can be simulated. It is only necessary to monitor the change curve of the parallel resistance over time to analyze the attenuation of the battery cell, thus avoiding the complicated testing process in the prior art.

[0038] The power module 5 includes a high-voltage power supply, and the output voltage can be 50 to 2000V. In this embodiment, high-temperature water and water mist are used to accelerate the potential induced decay of the photovoltaic module to achieve 100% RH humidity conditions, and a 1500V high voltage is loaded on the output end and surface of the photovoltaic module during the test.

[0039] The high voltage output unit 7 is a sliding connector, the test frame 4 is fixed to the inner wall of the shell 0, and the lower surface of the test frame 4 is provided with a slide rail. The high voltage output unit 7 is movably arranged on the slide rail and can be linearly displaced along the slide rail to facilitate the adjustment of the voltage application position.

[0040] One end of the high voltage output unit 7 is connected to the high voltage output unit 7 through a wire, and the other end is provided with an elastic wire, one end of which is provided with a clamping terminal, and the clamping terminal is connected to the main grid line of the photovoltaic module. The electric meter unit 9 is wirelessly connected to an external computer terminal.

[0041] The water injection assembly includes a solenoid valve 8 and a water pump 11 arranged on the water inlet of the water mist generating chamber, which can control the water level in the water mist generating chamber by injecting water flow, thereby controlling the distance between the water surface and the photovoltaic module. The water mist generating chamber is also provided with a stirring paddle 18 and a matching servo motor, so as to simulate the actual working scene through the turbulence of water, such as the wave scene on the sea surface. The water level in the water mist generating chamber is controlled by injecting water flow, so as to control the distance between the water surface and the photovoltaic module, and the humidity value in the test chamber is quickly adjusted by the water heating unit and the water mist generating unit, so as to efficiently adjust the humidity scene to meet the test requirements.

[0042] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A test device for underwater potential induced attenuation of photovoltaic modules, characterized in that: It comprises a housing (0) and a water mist generating chamber and a testing chamber arranged in the housing (0); The water mist generating chamber and the testing chamber are separated by a porous partition (1); The water mist generating chamber is provided with a water injection assembly, a water mist generating unit (2), and a water heating unit (3); A single-sided lifting component is provided in the test cavity, a heating metal plate (10) is provided on the single-sided lifting component, a photovoltaic component is provided on the heating metal plate (10), and the tilting posture of the photovoltaic component can be adjusted by single-sided lifting; The test chamber is also provided with a test rack (4), a power module (5), and an electric meter unit (9); The test stand (4) is provided with a high voltage output unit (7); The heating metal plate (10) and the high voltage output unit (7) are respectively connected to the power module (5), and the high voltage output unit (7) is connected to the main grid line of the photovoltaic module to form a negative bias voltage application structure; A test resistor (6) is also connected in parallel to the positive and negative ends of the photovoltaic module, and the electric meter unit (9) measures the voltage value at both ends of the test resistor (6); The power supply module (5) comprises a high voltage power supply; The water injection assembly comprises a solenoid valve (8) and a water supply pump (11) arranged on the water inlet of the water mist generating chamber, and can control the water level in the water mist generating chamber by injecting water flow, thereby controlling the distance between the water surface and the photovoltaic assembly.

2. A test device for underwater potential induced attenuation of photovoltaic modules according to claim 1, characterized in that: The photovoltaic module is a single solar cell or a combination of multiple solar cells.

3. A photovoltaic module underwater potential induced attenuation testing device according to claim 1, characterized in that: One end or both ends of the heating metal plate (10) are matched with a heater.

4. A photovoltaic module underwater potential induced attenuation testing device according to claim 1, characterized in that: The high voltage output unit (7) is a sliding connector; The test stand (4) is fixed to the inner wall surface of the housing (0); a slide rail is provided on the lower surface of the test stand (4); the high voltage output unit (7) is movably arranged on the slide rail and can perform linear displacement along the slide rail.

5. A test device for underwater potential induced attenuation of photovoltaic modules according to claim 4, characterized in that: One end of the high voltage output unit (7) is connected to the high voltage output unit (7) via a wire, and the other end is provided with an elastic wire, one end of the elastic wire is provided with a clamping terminal, and the clamping terminal is connected to the main grid line of the photovoltaic module.

6. A photovoltaic module underwater potential induced attenuation testing device according to claim 1, characterized in that: The electric meter unit (9) is wirelessly connected to an external computer terminal.

7. A photovoltaic module underwater potential induced attenuation testing device according to claim 1, characterized in that: A stirring paddle is also provided in the water mist generating chamber.

8. The test device for underwater potential induced attenuation of photovoltaic modules according to claim 1, characterized in that: The single-sided lifting assembly comprises a lifting electric cylinder (12) and a support plate (13), one side of the support plate (13) being hinged to the porous partition plate (1), while the output rod of the lifting electric cylinder (12) is against the lower surface of the support plate (13).

9. The test device for underwater potential induced attenuation of photovoltaic modules according to claim 1, characterized in that: A temperature sensor (14) and a humidity sensor (15) are also provided in the test chamber, and the temperature sensor (14) and the humidity sensor (15) are wirelessly connected to an external computer terminal.

Images