A three light source multi-channel real-time outdoor panel dust accumulation testing device and testing method

Abstract

The application discloses a kind of three light source multi-channel real-time outdoor panel dust accumulation testing device and testing method, the device includes: sealed cavity, with sealed cavity structure, card slot is arranged thereon, the card slot is used to hold the transparent panel of photovoltaic module to be detected;And three light source multi-channel test system, it is placed in sealed cavity, with motion arm, for driving three light source multi-channel test system moves on transparent panel and determines the light intensity of the transmitted light of transparent panel.The application can test the dust accumulation on the surface of photovoltaic panel in real time, and obtain the corresponding relationship between dust accumulation and light loss, on the basis of establishing the correlation between dust accumulation evolution and component output power loss, provide different grades of early warning for the cleaning of component, reduce the cleaning cost of power station, improve the power generation income of power station.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic power generation, and particularly relates to a three-light-source multi-channel real-time outdoor panel dust accumulation testing device and testing method. BACKGROUND

[0002] The photoelectric management of a photovoltaic power station should essentially ensure that as much light energy as possible enters the photoelectric conversion area inside the component, then the photoelectric conversion capacity of the component is increased through the improvement of component manufacturing technology, and the generated current is output through the series-parallel connection. For a certain inorganic photovoltaic component, the photoelectric conversion capacity is very stable within a certain time, and in an ideal state, the average annual attenuation of the conversion efficiency of the component is not more than 7 ‰. Therefore, the method to ensure that the component has the maximum power generation benefit is to maximize the number of solar photons entering the component. However, outdoor photovoltaic power stations generally face the problem that pollutants such as dust, flying sand and bird droppings in the environment deposit on the component panel, thereby affecting the reflectivity and transmittance of the panel on the photovoltaic component to different degrees, reducing the number of photons entering the photoelectric conversion area, and reducing the output energy efficiency of the power station. Therefore, testing the surface contamination of the photovoltaic component, and combining the loss of power generation of the power station and the balance of cleaning cost, regularly or irregularly cleaning the panel to maximize the economic benefit is an effective means to improve the power generation capacity of the power station.

[0003] For a centralized photovoltaic power station, due to the wide occupation area, the environment inside the power station is rich and diverse, and the distribution of dust on the panels in different areas of the same power station also presents great differences, and the corresponding cleaning work must also be treated differently to achieve a more economical cleaning strategy. However, at present, outdoor photovoltaic power stations lack proper cleaning management, and most of the monitoring of panel dust accumulation is by visual inspection, and many cleaning work is carried out according to experience or according to the relative decline of the output power of the power station under certain reference conditions. SUMMARY

[0004] The purpose of the present application is to provide a three-light-source multi-channel real-time outdoor panel dust accumulation testing device and testing method, which establishes the corresponding relationship between light loss and dust accumulation and dust accumulation and component output power loss, provides a graded early warning for the cleaning of the component, and improves the power generation benefit of the power station.

[0005] The present application adopts the following technical scheme: a three-light-source multi-channel real-time outdoor panel dust accumulation testing device, comprising:

[0006] A sealed cavity having a sealed cavity structure, a clamping groove is arranged on the sealed cavity, the clamping groove is used for clamping the transparent panel of the photovoltaic component to be detected; and a three-light-source multi-channel testing system is arranged in the sealed cavity, the three-light-source multi-channel testing system is provided with a moving arm, and the moving arm is used for driving the three-light-source multi-channel testing system to move on the transparent panel of the photovoltaic component and measure the light intensity of the transmitted light of the transparent panel of the photovoltaic component.

[0007] The three-light-source multi-channel test system comprises a solar power meter, a first laser, a second laser, a third laser, a storage controller, a first detector, a second detector, a third detector, a calculation and early warning transmitter, and an infrared limiter.

[0008] The solar power meter, the first laser, the second laser, the third laser, and the infrared limiter signal transmitter end are located in the same plane, and the first detector, the second detector, and the third detector are respectively located below the corresponding positions of the first laser, the second laser, and the third laser; an infrared limiter signal receiving end is also arranged on the plane where the first detector, the second detector, and the third detector are located, and the infrared limiter signal receiving end corresponds to the infrared limiter signal transmitting end in the same plane of the solar power meter; the first laser, the second laser, and the third laser are lasers emitting different wavelengths, and the first detector, the second detector, and the third detector are detectors corresponding to the emitted light of the first laser, the second laser, and the third laser.

[0009] The first laser, the second laser, and the third laser respectively emit laser beams of different wavelengths to the first detector, the second detector, and the third detector; the first detector, the second detector, the third detector, and the solar power meter are connected with the storage controller through a bus; the first detector, the second detector, the third detector, and the solar power meter transmit the measured data to the storage controller; the storage controller is connected with the calculation and early warning transmitter through a bus; and the storage controller transmits the data to the calculation and early warning transmitter.

[0010] Preferably, the clamping groove has a clamping structure for clamping the transparent panel of the photovoltaic module to be detected.

[0011] Preferably, the material of the sealed cavity is composed of a light-shielding material.

[0012] Preferably, a power supply interface and a collection interface are further arranged on the sealed cavity, the power supply interface is used for accessing a power supply, the calculation and early warning transmitter collects the current and voltage of the photovoltaic module to be detected through the collection interface, and the calculation and early warning transmitter calculates the output power P of the photovoltaic module to be detected through the current and voltage. OUT .

[0013] Another technical solution provided by the application is as follows:

[0014] A test method of a three-light-source multi-channel real-time outdoor panel dust accumulation test device, comprising the following steps:

[0015] Step 1: The three-light-source multi-channel test system is brought to different test positions of the transparent panel of the photovoltaic module to be detected by the movement arm of the three-light-source multi-channel test system, and the test positions are determined by the infrared limiter.

[0016] Step 2, the light emitting path of the three light source multi-channel test system is perpendicular to the transparent panel of the photovoltaic module. First, the calibration of the light emitting source is carried out. The three light source multi-channel test system emits light to the first detector, the second detector and the third detector through the first laser, the second laser and the third laser, detects the initial light intensity, and labels and stores the initial light intensity I 10 , 20 , 30 The data is stored in the storage controller. Then, the transmittance light intensity of the transparent panel of the photovoltaic module in the clean state is tested, and is labeled and stored as I 11 , 21 , 31 The data is stored in the storage controller. Then, the transmittance light intensity of the transparent panel of the photovoltaic module in the clean state is tested, and is labeled and stored as I 12 , 22 , 32 The data is stored in the storage controller.

[0017] Step 3, the data in the storage controller is calculated by the calculation and warning emitter.

[0018] According to A RCT = lg(I RTC0 / I RCT1 ), the light intensity I RCT1 of the sunlight transmitted through the transparent panel with dust under the real-time test condition is calculated. RCT ; wherein, A RTC0 represents the difference between the absorbance of the transparent panel to be detected in the state with dust and in the clean state, I OUT is the light intensity of the incident light under the real-time test condition, which is obtained by testing the solar power meter provided by the three light source multi-channel test system;

[0019] The output power P RTC of the photovoltaic module to be detected is collected through the collection interface, and the conversion efficiency of the photovoltaic module under the real-time test condition is obtained, which is:

[0020] η OUT = P RCT1 / (I IRTC ×M)

[0021] In the formula, M is the area of the photovoltaic module;

[0022] The light intensity absorbed by the dust on the surface of the photovoltaic module under the real-time test condition is calculated, which is:

[0023] Δ RTC0 = I RCT1

[0024] The power loss due to the absorption of dust on the solar light under real-time test conditions is calculated as:

[0025] P DUST = ΔI RTC × η RTC × M.

[0026] Step 4, the power loss obtained by the calculation is used by the calculation and warning transmitter to establish a dust warning strategy for the local power station.

[0027] Preferably, according to the different wavelengths of laser light emitted by the first laser, the second laser and the third laser, the absorbance A 11 , A 21 , A 31 of the clean photovoltaic panel to the three groups of different wavelength laser light and the absorbance A 12 , A 22 , A 32 of the photovoltaic panel with dust to the three groups of different wavelength laser light are obtained. 11 , A 21 , A 31 ; according to the absorbance formula A = lg(I0 / I1), where I0 is the incident light intensity and I1 is the transmitted light intensity after the incident light passes through the object, the absorbance A 12 , A 22 , A 32 of the clean photovoltaic panel to the three groups of different wavelength laser light and the absorbance A 11 , A 10 , A 11 of the photovoltaic panel with dust to the three groups of different wavelength laser light are calculated respectively, as follows:

[0028] A 11 = lg(I 10 / I 11 )

[0029] A 21 = lg(I 20 / I 21 )

[0030] A 31 = lg(I 30 / I 31 )

[0031] A 12 = lg(I 10 / I 12 )

[0032] A 22 = lg(I 20 / I 22 )

[0033] A 32 = lg(I 30 / I 32 )

[0034] The difference between the absorbance of the dusted panel and the absorbance of the cleaned panel is obtained by absorbance, which is:

[0035] A1=A 12 -A 11

[0036] A2=A 22 -A 21

[0037] A3=A 32 -A 31 ;

[0038] According to the intensity of sunlight in the determination environment, A RCT is selected from A1, A2 or A3.

[0039] Preferably, different wavelengths of laser are selected according to the intensity of sunlight, and in real-time testing of light conditions, when the sunlight is strong, the absorbance corresponding to the laser with wavelength λ1 is selected, and the wavelength λ1 is 400-500 nm; when the light is weak, the absorbance corresponding to the laser with wavelength λ3 is selected, and the wavelength λ3 is 800-900 nm; under other conditions, the absorbance corresponding to the laser with wavelength λ2 is selected, and the wavelength λ2 is 600-700 nm.

[0040] Preferably, the calculation and warning transmitter establishes a local power station dusting warning strategy based on the calculated power loss, which is:

[0041] If the cleaning cost of the photovoltaic module is C / m 2 , the cleaning cost of a single module is:

[0042] C module =C×m

[0043] In the formula, m is the area of a single module;

[0044] If the electricity fee of the power station is F / degree, the daily power generation of the photovoltaic module is T hours, and the daily electricity fee loss corresponding to the dust is:

[0045] C DUST =P DUST ×F×T / 1000

[0046] The transparent panel dusting condition of the photovoltaic module is detected every day, and the daily dusting electricity fee loss of the adjacent photovoltaic module is automatically generated, and the cumulative dusting electricity fee loss C nTDUST of the module after a certain date interval n days is automatically calculated based on the last rainfall or the cleaning end day of the module.

[0047] In the formula, C 1TDUSTLoss of electricity cost of the component after a certain date interval 1 day, C 2TDUST Loss of electricity cost of the component after a certain date interval 2 days, C nDUST Loss of electricity cost of the component after a certain date interval n days.

[0048] Preferably, when the loss of electricity cost of dust on the nth day reaches 50% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning preparation level warning; when the loss of electricity cost of dust on the nth day reaches 80% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning first-level warning; when the loss of electricity cost of dust on the nth day reaches 100% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning second-level warning; when the loss of electricity cost of dust on the nth day reaches 120% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning third-level warning; when the loss of electricity cost of dust on the nth day reaches 150% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning fourth-level warning; when the loss of electricity cost of dust on the nth day reaches 200% of the cleaning cost C module The three-light-source multi-channel real-time outdoor panel dust testing device gives a cleaning fifth-level warning.

[0049] The beneficial effects of the present application are: the present application proposes to place a transparent contrast photovoltaic panel of the same material as the photovoltaic panel of the real component beside the real component, then utilize the different transmission characteristics of the three groups of different wavelength lasers to realize multi-channel testing of the dust absorbance on the panel, and obtain the real component output power loss information closely related to the dust on the panel through internal calculation and processing. The present application can effectively test the dust on the surface of the photovoltaic panel in real time, and obtain the corresponding relationship between the dust and the light loss, on the basis of which the correlation between the dust accumulation evolution and the component output power loss is established, different levels of early warning for cleaning of the component are provided, the cleaning cost of the power station is reduced, and the power generation income of the power station is improved. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a structure schematic diagram of a three-light-source multi-channel real-time outdoor panel dust testing device of the present application.

[0051] Figure 2 It is a structure schematic diagram of a three-light-source multi-channel testing system of the present application.

[0052] Figure 3 It is a position diagram when the light intensity of a three-light-source multi-channel real-time outdoor panel dust testing device of the present application is calibrated.

[0053] Figure 4 This is a schematic diagram of a photovoltaic panel dust accumulation test using a three-light source multi-channel real-time outdoor panel dust accumulation test device according to the present invention.

[0054] Figure 5 This is a cross-sectional view of the card slot of the present invention.

[0055] Among them: 1. Cavity, 2. Three-light source multi-channel test system, 3. Card slot, 4. Side door, 5. Transparent panel, 6. Solar power meter, 7. First laser, 8. Second laser, 9. Third laser, 10. Storage controller, 11. First detector, 12. Second detector, 13. Third detector, 14. Calculation and warning transmitter, 15. Infrared limit, 16. Power interface, 17. Collection interface, 18. Knob. DETAILED DESCRIPTION

[0056] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] Example 1:

[0058] like Figure 1 As shown, a three-light source, multi-channel, real-time outdoor panel dust accumulation test device includes a sealed chamber 1, a three-light source, multi-channel test system 2, a card slot 3, a side door 4, a transparent panel 5, a power interface 16, and a collection interface 17. The sealed chamber 1 has a sealed chamber structure and is made of a light-shielding material, such as stainless steel, aluminum alloy, or polymer plastic. A card slot 3 is provided on the top of the sealed chamber 1 for clamping a transparent panel 5 of varying thicknesses; a side door 4 is provided on the side of the sealed chamber 1, and a power interface 16 is provided on the outside of the sealed chamber 1 for connecting to a power source. The power source connected to the power source, such as a solar cell or energy storage battery, mainly provides DC power. The basic requirements are input voltage and current, such as 5V, 2A; 9V, 2A; or 15V, 3A. Normally, the sealed chamber 1 is closed to avoid the influence of the external environment. During testing, the side door 4 on the sealed chamber 1 is opened.

[0059] An acquisition interface 17 is provided outside the sealed cavity 1 for collecting the output power of the photovoltaic component to be tested; the three-light source multi-channel test system 2 is placed in the sealed cavity 1 and is provided with a moving arm for driving the three-light source multi-channel test system 2 to move on the transparent panel 5 and measure the light intensity of the transmitted light of the transparent panel 5.

[0060] like Figure 2As shown in the structure of the three light source multi-channel test system 2, it comprises: a solar power meter 6, a first laser 7, a second laser 8, a third laser 9, a storage controller 10, a first detector 11, a second detector 12, a third detector 13, a calculation and early warning transmitter 14 and an infrared limiter 15.

[0061] The solar power meter 6, the first laser 7, the second laser 8, the third laser 9 and the infrared limiter 15 signal emitting end are located in the same plane, and the first detector 11, the second detector 12 and the third detector 13 are respectively located below the corresponding positions of the first laser 7, the second laser 8 and the third laser 9; the plane where the first detector 11, the second detector 12 and the third detector 13 are located is also provided with an infrared limiter 15 signal receiving end, which corresponds to the infrared limiter 15 signal emitting end in the same plane of the solar power meter 6.

[0062] The structure of the three light source multi-channel test system 2 is built-in solar power meter 6, and three different wavelengths of the first laser 7, the second laser 8 and the third laser 9 are used as light sources, the selection of the wavelength is highly related to the spectral response of the tested dust accumulation component, and the spectral response range and shape of the components made of different materials are different, so different light source wavelengths need to be selected. The laser light spot is adjustable, the power is adjustable, and it can be 3 groups of light sources with equal light intensity.

[0063] The first laser 7, the second laser 8 and the third laser 9 respectively emit laser beams of different wavelengths to the first detector 11, the second detector 12 and the third detector 13; the first detector 11, the second detector 12, the third detector 13 and the solar power meter 6 are connected with the storage controller 10 through a bus, and the first detector 11, the second detector 12, the third detector 13 and the solar power meter 6 transmit the measured data to the storage controller 10; the storage controller 10 is connected with the calculation and early warning transmitter 14 through a bus, and the storage controller 10 transmits the data to the calculation and early warning transmitter 14.

[0064] As shown in the structure of the three light source multi-channel test system 2, it comprises: a solar power meter 6, a first laser 7, a second laser 8, a third laser 9, a storage controller 10, a first detector 11, a second detector 12, a third detector 13, a calculation and early warning transmitter 14 and an infrared limiter 15. Figure 5 As shown in the structure of the three light source multi-channel test system 2, it comprises: a solar power meter 6, a first laser 7, a second laser 8, a third laser 9, a storage controller 10, a first detector 11, a second detector 12, a third detector 13, a calculation and early warning transmitter 14 and an infrared limiter 15.

[0065] The transparent panel 5 in the present application is a panel of the same material and transparent as the panel of the power station component, and the whole transparent panel 5 is located beside the real component of the power station, and has the same environmental conditions.

[0066] As shown in the structure of the three light source multi-channel test system 2, it comprises: a solar power meter 6, a first laser 7, a second laser 8, a third laser 9, a storage controller 10, a first detector 11, a second detector 12, a third detector 13, a calculation and early warning transmitter 14 and an infrared limiter 15. Figure 3 and Figure 4The test method of the three-light-source multi-channel real-time outdoor panel dust accumulation test device is as follows:

[0067] Step 1: The three-light-source multi-channel test system 2 moves to different positions for testing according to the test instructions sent by the storage controller 10, and the test positions are determined by the infrared limiters 15.

[0068] Step 2: The emission light path of the laser of the three-light-source multi-channel test system 2 is perpendicular to the transparent panel 5. The three-light-source multi-channel test system 2 first performs calibration of the emission light source. The emitted light of the first laser 7, the second laser 8, and the third laser 9 reaches the first detector 11, the second detector 12, and the third detector 13, respectively, to detect the initial light intensity, which is marked as I 10 , I 20 , I 30 , and is calibrated to 100%. The data is stored in the storage controller 10.

[0069] The three-light-source multi-channel test system 2 tests the light intensity of the clean transparent panel 5 in advance. The three groups of lasers pass through the clean transparent panel 5 and reach the detectors to detect the light intensity of the transmitted light, which is marked as I 11 , I 21 , I 31 . The data is stored in the storage controller 10 (this process can also extract the pre-stored light intensity data of various clean transparent photovoltaic panels from the storage controller 10 inside the three-light-source multi-channel test system 2).

[0070] After a certain dust accumulation time interval, such as one day, the light intensity of the transparent panel 5 with dust is tested. The lasers emitted by the first laser 7, the second laser 8, and the third laser 9 pass through the transparent panel 5 and reach the corresponding first detector 11, the second detector 12, and the third detector 13, respectively, to detect the light intensity of the transmitted light, which is marked as I 12 , I 22 , I 32 . The data is stored in the storage controller 10. After the test is completed, the three-light-source multi-channel test system 2 returns to the state shown in Figure 1 .

[0071] If the dust distribution on the surface of the transparent panel 5 is uneven, or multiple-point testing is required, the three-light-source multi-channel test system 2 can move along the photovoltaic panel in the direction indicated by the arrow as shown in Figure 4 , and perform multiple-point testing. The data is stored in the storage controller 10 and processed using the calculation and warning emitter 14.

[0072] Step 3, the calculation and pre-warning transmitter 14 calculates the data in the storage controller 10. According to the absorbance formula A = lg (I0 / I1), wherein I0 is the incident light intensity, and I1 is the intensity of the transmitted light after the incident light passes through the object, the absorbance A of the clean photovoltaic panel to the three groups of different wavelength lasers is calculated respectively 11 = lg (I 10 / I 11 ), A 21 = lg (I 20 / I 21 ), A 31 = lg (I 30 / I 31 ) and the absorbance A of the photovoltaic panel with dust to the three groups of different wavelength lasers 12 = lg (I 10 / I 12 ), A 22 = lg (I 20 / I 22 ), A 32 = lg (I 30 / I 32 ) are obtained. The difference between the absorbance of the photovoltaic panel with dust and the absorbance of the clean photovoltaic panel is A1 = A 12 -A 11 , A2 = A 22 -A 21 , A3 = A 32 -A 31 .

[0073] According to the dust absorbance A on the panel under the irradiation of the above three groups of different wavelength lasers, under the real-time test light condition (RTC), the absorbance of the dust on the panel obtained by selecting different wavelength lasers is selected, such as when the ultraviolet light is strong and the sunlight is sufficient, the absorbance corresponding to the wavelength λ1 laser is selected, the wavelength λ1 is 400-500 nm; when the light is weak, the absorbance corresponding to the wavelength λ3 laser is selected, the wavelength λ3 is 800-900 nm; under other conditions, the absorbance corresponding to the wavelength λ2 laser is selected, the wavelength λ2 is 600-700 nm. Preferably, the wavelength λ1 is 450 nm, the wavelength λ2 is 650 nm, and the wavelength λ3 is 800 nm. According to A RCT = lg (I RTC0 / I RCT1 ), the intensity I RCT1 of the sunlight transmitted through the dust under the real-time test condition is calculated. Wherein A RCT represents the difference between the absorbance of the dust panel and the absorbance of the clean panel, and I RTC0The light intensity under real-time test conditions is obtained by the solar power meter 6 of the three-light source multi-channel test system 2. No matter what panel the light shines on, at a certain moment, the intensity of the incident light is the same. This light intensity value is obtained by the solar power meter 6 test according to A RCT =lg(I RTC0 / I RCT1 ), calculate the light intensity I of sunlight passing through dust under real-time test conditions RCT1 .

[0074] The calculation and warning transmitter 14 collects the current and voltage of the photovoltaic module to be detected through the collection interface 17, and calculates the output power P of the photovoltaic module to be detected through the current and voltage. OUT Obtain the actual component conversion efficiency η under real-time test conditions RTC =P OUT / (I RCT1 × M), where M is the area of ​​the photovoltaic module, and the light intensity ΔI absorbed by the dust on the surface of the photovoltaic module under real-time test conditions is calculated. RTC =I RTC0 -I RCT1 , calculate the power loss P under real-time test conditions due to the absorption of sunlight by dust DUST =ΔI RTC ×η RTC ×M.

[0075] Step 4: The calculation and warning transmitter 14 establishes a local power station dust accumulation warning strategy based on the power loss obtained by calculation.

[0076] The local PV panel cleaning cost is C / m 2 , calculate the cleaning cost of a single component as C module =C×m, where m is the area of ​​a single module. The local power station’s on-grid electricity fee is F / kWh, and the photovoltaic module generates electricity for T hours per day. The daily fee loss caused by dust accumulation corresponds to C DUST =P DUST ×F×T / 1000.

[0077] The present invention regularly detects the dust accumulation of the transparent panel 5 every day, automatically generates the electricity cost loss of the photovoltaic module to be detected for the day, and automatically calculates the cumulative electricity cost loss of the module after a certain interval of n days, taking the end of the last rainfall or the end of the module cleaning as the base date: Among them, C 1TDUST The electricity loss of the component after one day of dust accumulation on a certain date, C 2TDUST The electricity loss of the component after 2 days of dust accumulation on a certain date, C nDUST The electricity cost loss due to dust accumulation on the component after a certain interval of n days.

[0078] When the dust accumulation electricity cost loss reaches 50% of the cleaning cost C on the nth day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning preparation level warning; when the dust accumulation electricity cost loss reaches 80% of the cleaning cost C on the n2th day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning first level warning; when the dust accumulation electricity cost loss reaches 100% of the cleaning cost C on the n3th day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning second level warning; when the dust accumulation electricity cost loss reaches 120% of the cleaning cost C on the n4th day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning third level warning; when the dust accumulation electricity cost loss reaches 150% of the cleaning cost C on the n5th day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning fourth level warning; when the dust accumulation electricity cost loss reaches 200% of the cleaning cost C on the n6th day module , the three light source multi-channel real-time outdoor panel dust test device gives a cleaning fifth level warning; the warning of the present application is accessed to the power station operation and maintenance terminal by the wireless transmission mode of the calculation and warning transmitter 14.

[0079] In addition, according to the dust accumulation distribution of components in the power station, the three light source multi-channel real-time outdoor panel dust test device can be installed according to the area of the component array distribution, and the dust accumulation of the entire area can be tested, and the local power station dust warning strategy established in step 4 is also applicable.

[0080] Although the content of the present application has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present application. After reading the above content, various modifications and alternatives of the present application will be obvious to those skilled in the art. Therefore, the protection scope of the present application should be defined by the appended claims.

Claims

1. A three-light source multi-channel real-time outdoor panel dust accumulation test device, characterized in that: include: A sealed cavity (1) having a sealed cavity structure, on which a card slot (3) is provided, and the card slot (3) is used to clamp a transparent panel (5) of a photovoltaic assembly to be inspected; and a three-light source multi-channel test system (2) placed in the sealed cavity (1) and having a moving arm for driving the three-light source multi-channel test system (2) to move on the transparent panel (5) and measure the light intensity of the transmitted light of the transparent panel (5); The three-light source multi-channel test system (2) comprises: a solar power meter (6), a first laser (7), a second laser (8), a third laser (9), a storage controller (10), a first detector (11), a second detector (12), a third detector (13), a calculation and warning transmitter (14) and an infrared limiter (15); The solar power meter (6), the first laser (7), the second laser (8), the third laser (9) and the infrared limiter (15) signal transmitting end are located on the same plane, and the first detector (11), the second detector (12) and the third detector (13) are respectively located below the corresponding positions of the first laser (7), the second laser (8) and the third laser (9); an infrared limiter (15) signal receiving end is also provided on the plane where the first detector (11), the second detector (12) and the third detector (13) are located, and the infrared limiter (15) signal receiving end corresponds to the infrared limiter (15) signal transmitting end located on the same plane as the solar power meter (6); the first laser (7), the second laser (8) and the third laser (9) are lasers emitting different wavelengths respectively, and the first detector (11), the second detector (12) and the third detector (13) are detectors corresponding to the light emitted by the first laser (7), the second laser (8) and the third laser (9); The first laser (7), the second laser (8), and the third laser (9) respectively emit lasers of different wavelengths to the first detector (11), the second detector (12), and the third detector (13); the first detector (11), the second detector (12), the third detector (13), and the solar power meter (6) are connected to a storage controller (10) via a bus; the first detector (11), the second detector (12), the third detector (13), and the solar power meter (6) transmit measured data to the storage controller (10); the storage controller (10) is connected to the calculation and early warning transmitter (14) via a bus; the storage controller (10) transmits data to the calculation and early warning transmitter (14).

2. The three-light source multi-channel real-time outdoor panel dust accumulation test device according to claim 1, characterized in that: The card slot (3) has a clamping structure for clamping the transparent panel (5) to be inspected.

3. The three-light source multi-channel real-time outdoor panel dust accumulation test device according to claim 1, characterized in that: The material of the sealed cavity (1) is composed of light-shielding material.

4. The three-light source multi-channel real-time outdoor panel dust accumulation test device according to claim 1, characterized in that: The sealed cavity (1) is further provided with a power interface (16) and a collection interface (17), wherein the power interface (16) is used to connect to a power source, and the calculation and early warning transmitter (14) collects the current and voltage of the photovoltaic assembly to be detected through the collection interface (17), and the calculation and early warning transmitter (14) calculates the output power P of the photovoltaic assembly to be detected based on the current and voltage. OUT .

5. A testing method for a three-light source multi-channel real-time outdoor panel dust accumulation testing device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: The moving arm of the three-light-source multi-channel test system (2) moves the three-light-source multi-channel test system (2) to different test positions of the transparent panel (5) to be tested for testing, and the test positions are determined by the infrared limiter (15); Step 2: The emission light path of the three-light source multi-channel test system (2) is perpendicular to the transparent panel (5). First, the emission light source is calibrated. The three-light source multi-channel test system (2) emits light through the first laser (7), the second laser (8) and the third laser (9) to reach the first detector (11), the second detector (12) and the third detector (13). The initial light intensity is detected, and the initial light intensity I of the three light sources is marked and stored. 10 , I 20 , I 30 , the data is stored in the storage controller (10), and then the intensity of the transmitted light of the transparent panel (5) in the clean state is tested, marked and stored as I 11 , I 21 , I 31 , the data is stored in the storage controller (10), and then the intensity of the transmitted light of the transparent panel (5) with dust to be detected is tested, marked and stored as I 12 , I 22 , I 32 , the data is stored in the storage controller (10); Step 3: The calculation and warning transmitter (14) calculates the data in the storage controller (10); According to A RCT =lg(I RTC0 / I RCT1 ), calculate the light intensity I of sunlight passing through the transparent panel (5) with dust under real-time test conditions RCT1 ; Among them, A RCT represents the difference in absorbance between the transparent panel (5) to be tested in the dusty state and the clean state, I RTC0 The light intensity of the incident light under real-time test conditions is obtained by testing with the solar power meter (6) provided with the three-light source multi-channel test system (2); The output power P of the photovoltaic module to be detected is collected through the collection interface (17) OUT , the conversion efficiency of the photovoltaic module under real-time test conditions is obtained as: or RTC =P OUT / (I RCT1 ×M) Where M is the area of ​​the photovoltaic module; Calculate the light intensity absorbed by the dust on the surface of the photovoltaic module under real-time test conditions as follows: Δ IRTC =I RTC0 -I RCT1 Calculate the power loss under real-time test conditions due to absorption of sunlight by dust accumulation as: P DUST =ΔI RTC ×η RTC ×M Step 4: The calculation and warning transmitter (14) establishes a local power station dust accumulation warning strategy based on the calculated power loss.

6. The testing method of the three-light source multi-channel real-time outdoor panel dust accumulation testing device according to claim 5, characterized in that: According to the lasers of different wavelengths emitted by the first laser (7), the second laser (8), and the third laser (9), the absorbance A of the clean photovoltaic panel to the three groups of lasers of different wavelengths is obtained. 11 、A 21 、A 31 Absorbance A of three groups of lasers with different wavelengths for photovoltaic panels with dust 12 、A 22 、A 32 According to the absorbance formula A = lg (I0 / I1), where I0 is the incident light intensity and I1 is the intensity of the transmitted light after the incident light passes through the object, the absorbance A of the clean photovoltaic panel to three groups of lasers with different wavelengths is calculated respectively. 11 、A 21 、A 31 Absorbance A of three groups of lasers with different wavelengths for photovoltaic panels with dust 12 、A 22 、A 32 ,for: AND 11 =lg(I 10 / AND 11 ) AND 21 =lg(I 20 / AND 21 ) AND 31 =lg(I 30 / AND 31 ) AND 12 =lg(I 10 / AND 12 ) AND 22 =lg(I 20 / AND 22 ) AND 32 =lg(I 30 / AND 32 ) The difference between the absorbance of the dusty panel and the absorbance of the clean panel is obtained through absorbance: A1=A 12 -A 11 A2=A 22 -A 21 A3=A 32 -A 31 ; According to the measured sunlight intensity A in the environment RCT The value of is selected from A1, A2 or A3.

7. The testing method of the three-light source multi-channel real-time outdoor panel dust accumulation testing device according to claim 6, characterized in that: Select lasers of different wavelengths according to the intensity of sunlight. Under the lighting conditions of real-time testing, when the ultraviolet rays are strong and the sunlight is sufficient, select the absorbance corresponding to the laser with a wavelength of λ1, and the wavelength of λ1 is 400-500nm; when the light is weak, select the absorbance corresponding to the laser with a wavelength of λ3, and the wavelength of λ3 is 800-900nm; under other conditions, select the absorbance corresponding to the laser with a wavelength of λ2, and the wavelength of λ2 is 600-700nm.

8. The testing method of the three-light source multi-channel real-time outdoor panel dust accumulation testing device according to claim 5, characterized in that: The calculation and warning transmitter (14) establishes a local power station dust accumulation warning strategy based on the calculated power loss, which is: If the cleaning cost of photovoltaic modules is C / m 2 , calculate the cleaning cost of a single component as: C module =C×m Where m is the area of ​​a single component; If the power plant's on-grid electricity fee is F / kWh, and the photovoltaic panels generate electricity for T hours per day, the corresponding daily fee loss due to dust accumulation is: C DUST =P DUST ×F×T / 1000 The dust accumulation condition of the transparent panel (5) is detected regularly every day, and the electricity cost loss of the photovoltaic module to be detected on the day of dust accumulation is automatically generated. The accumulated electricity cost loss C of the module after a certain interval of n days is automatically calculated based on the end of the last rainfall or the end of the module cleaning. nTDUST ,for: Among them, C 1TDUST The electricity loss of the component after one day of dust accumulation on a certain date, C 2TDUST The electricity loss of the component after 2 days of dust accumulation on a certain date, C nDUST The electricity cost loss due to dust accumulation on the component after a certain interval of n days.

9. The testing method of the three-light source multi-channel real-time outdoor panel dust accumulation testing device according to claim 8, characterized in that: When the electricity loss from dust accumulation on day n1 reaches the cleaning cost C module When the dust accumulation loss reaches 50% of the cleaning cost C on the n2th day, the three-light source multi-channel real-time outdoor panel dust accumulation test device gives a cleaning preparation level alarm; when the dust accumulation electricity loss reaches ... module When the dust accumulation loss reaches 80% of the cleaning cost C on the n3th day, the three-light source multi-channel real-time outdoor panel dust accumulation test device gives a cleaning level 1 alarm; when the dust accumulation loss reaches ... module When the dust accumulation loss reaches 100%, the three-light source multi-channel real-time outdoor panel dust accumulation test device gives a cleaning level 2 alarm; when the dust accumulation electricity loss reaches the cleaning cost C on the n4th day module When the dust accumulation loss reaches 120% of the cleaning cost, the three-light source multi-channel real-time outdoor panel dust accumulation test device gives a cleaning level 3 alarm; when the dust accumulation electricity loss reaches the cleaning cost C on the n5th day module When the dust accumulation loss reaches 150% of the cleaning cost C on the n6th day, the three-light source multi-channel real-time outdoor panel dust accumulation test device gives a cleaning level 4 alarm; when the dust accumulation loss reaches ... module When the dust level reaches 200%, the three-light source multi-channel real-time outdoor panel dust accumulation testing device gives a level 5 cleaning warning.

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