CN201859011U - Apparatus for detecting irradiation homogeneity and stability of solar simulator - Google Patents

Abstract

A device for detecting the uniformity and stability of solar simulator irradiation, said device comprising: a silicon battery sheet, a detector is provided for the device; a data collector, an IV is passed between the data collector and the silicon battery sheet The converter is connected to carry out AD conversion on the signal collected by the device; a computer is connected with the data collector to provide data display for the device; the combined device is used to detect the uniformity and stability of the solar simulator. The signal detected by the device is the voltage signal converted by the IV converter, A/D conversion is performed by the data collector, and the computer displays the data curve.

Description

A device for testing the uniformity and stability of solar simulator irradiation

technical field

The present application relates to a testing device, in particular to a device for testing the uniformity and stability of solar simulator irradiation.

Background technique

A solar simulator is a device used to simulate solar irradiation. At present, most photovoltaic companies use solar simulators instead of the sun to simulate irradiation on cells to obtain their photoelectric conversion characteristics, such as short-circuit current (Isc), open-circuit voltage ( Voc), maximum power (Pmax), conversion efficiency (η), fill factor (FF), etc. These parameters can reflect the quality and performance of solar cells, which not only have great reference and guiding significance for the production process, but also relate to the grade and price of the final photovoltaic products as well as the profit and reputation of the manufacturer. In order to ensure the accuracy and fairness of the measurement, it is necessary to determine the uniformity and stability of the solar simulator's irradiation, that is, to measure the non-uniformity of irradiation and the non-uniformity of irradiation specified in the performance requirements of the IEC 60904-9:2006 solar simulator. stability.

Irradiance unevenness refers to the maximum relative deviation of irradiance as a function of position within the entire range of the effective irradiated surface. Irradiation instability refers to the maximum relative deviation of irradiance over time at any given position within the effective irradiation surface within a specified time interval. According to IEC60904-9:2006, the effective irradiated surface of the solar simulator is equally divided into several areas, the effective light-receiving area of each area shall not be greater than 400cm ² , and the number of areas is determined by the total effective irradiated area of the solar simulator. decision, generally not less than 64. The detector is used to scan continuously along the selected characteristic direction in the effective irradiation surface, and the light irradiance received at each point will be converted into an electrical signal output. Since when the irradiance of the solar simulator changes, the ratio of the short-circuit current generated by it irradiating on the solar cell to the irradiance of the solar simulator is close to a constant, so the short-circuit current generated by the detector is measured with an ammeter, and it can be obtained The irradiance change of the solar simulator.

However, how to collect the short-circuit current generated by the solar cells under the irradiation of the solar simulator is a technical difficulty, and the collection of the irradiance change of the solar simulator has therefore become a difficult problem. Although my country's photovoltaic enterprises have developed rapidly and have become the world's largest producer, before we started to apply the detection device described in this utility model in 2009, there was no relevant means to check the uniformity and uniformity of the solar simulator's irradiation. Stability testing and measurement.

Utility model content

The purpose of this utility model is to provide a device for detecting the uniformity and stability of solar simulator irradiation, which has the function of converting optical signals into electrical signals and collecting data quickly and accurately. The device is convenient to carry and is applicable to various types of solar simulators.

For achieving the above object, the technical scheme that the utility model adopts is:

The utility model provides a device for detecting the uniformity and stability of solar simulator irradiation, and the device includes:

A silicon cell;

A data collector, which is connected to the silicon cell through an I-V converter;

A computer, the computer is connected with the data collector.

Wherein the connection between the I-V converter and the data collector is a coaxial cable, and both ends of the coaxial cable have a connector.

Wherein the silicon solar cell is monocrystalline silicon or polycrystalline silicon, and the front side of the silicon solar cell faces the light source of the solar simulator.

The data collector described therein contains multiple channels.

Wherein the resistance of the I-V converter is 10-500 milliohms.

Compared with the prior art, the utility model has the following advantages:

1. The silicon cells used in this utility model are packaged and calibrated, which meet the requirements of value transmission and can effectively guarantee the accuracy of the detection results.

2. The utility model uses a high-power resistor with stable resistance as an I-V converter to convert the current signal into a voltage signal, which is very conducive to the rapid collection of data.

3. The utility model has a simple structure, is easy to install and carry, and can well meet the on-site detection and measurement requirements of photovoltaic enterprises and testing institutions.

4. The utility model is applicable to steady-state and transient solar simulators, cell sorting instruments and optical aging equipment based on the same principle.

Description of drawings

Below in conjunction with accompanying drawing and embodiment structure and feature of the present utility model are described in further detail, wherein:

Fig. 1 is the device schematic diagram of the present utility model.

Fig. 2 is to use the device of the utility model to detect the uniformity of the transient solar simulator.

Fig. 3 is to use the device of the utility model to detect the stability of the transient solar simulator.

Fig. 4 is to use the device of the utility model to detect the uniformity of the steady-state solar simulator.

Fig. 5 is to use the device of the utility model to detect the stability of the steady-state solar simulator.

Detailed ways

See also shown in Fig. 1, the utility model provides a kind of device that detects solar simulator irradiation uniformity and stability, described device comprises:

A silicon solar cell 1 provides a detector for this device, and the silicon solar cell 1 is a solar cell packaged through a calibrated aluminum base; the silicon solar cell 1 is monocrystalline silicon or polycrystalline silicon; the size of the silicon solar cell 1 can be determined according to Select according to the actual situation of the solar simulator; when testing the irradiance uniformity and stability of the solar simulator, the front side of the silicon cell 1 faces the light source of the solar simulator;

A data collector 2, connected between the data collector 2 and the silicon cell 1 through an I-V converter 11, carries out AD conversion to the signal acquired by the device; the resistance value of the I-V converter 11 is 10-500 mm ohm; the connection 13 between the I-V converter 11 and the data collector 2 is a coaxial cable, and both ends of the coaxial cable have a joint 12; wherein the data collector 2 includes multiple channels, and the detection Choose one channel or two channels;

A computer 3, the computer 3 is connected with the data collector 2, and provides data display to the device;

This combination device is used to detect the uniformity and stability of the solar simulator's irradiation. The signal detected by this device is the voltage signal converted by the I-V converter 11. The A/D conversion is performed by the data collector 2, and the computer displays the data curve. .

In the preparation process of the test, refer to IEC 60904-9:2006, according to the actual situation of the solar simulator, select the resistance value of the IV converter and the size of the silicon solar cell, and divide the effective irradiation surface of the simulator into several There are no less than 64 areas, and the effective light-receiving area of each area shall not be greater than 400cm ² . Then, the silicon cell is used as the detector, and its front faces the light source of the solar simulator, and continuously scans along the selected characteristic direction in the effective irradiation surface, and through the data acquisition system, the light irradiance received by each point is converted into voltage signal. When the irradiance of the solar simulator changes, the ratio of the short-circuit current generated by it irradiating on the solar cell to the irradiance of the solar simulator is close to a constant. However, the performance of the IV converter is stable, and the resistance value does not change with the environment. Therefore, in the entire effective irradiation surface, find the maximum and minimum values of the measured voltage, which can be equivalent to the maximum value (Emax) and minimum value (Emin) of the received light irradiance, according to the formula ± (Emax-Emin)/(Emax+Emin)×100% to calculate unevenness. During the entire measurement process, find the maximum and minimum values of the measured voltage, which are equivalent to the maximum value (Emax) and minimum value (Emin) of the irradiance, using the formula ±(Emax-Emin)/(Emax+Emin )×100% to calculate the instability. Finally, the uniformity and stability of the solar simulator are evaluated according to IEC 60904-9:2006 and non-uniformity and instability data.

Test case one

The following is a device for testing the uniformity and stability of solar simulator irradiation of the present utility model to test the uniformity and stability of irradiation of a transient solar simulator used in the production and testing of a photovoltaic enterprise.

1. Uniformity test:

A calibrated and packaged monocrystalline silicon solar cell with an area of 12.5cm×12.5cm is used as a detector, and the resistance value of the I-V converter is selected to be 25 milliohms. Referring to IEC60904-9, the effective irradiation surface (2m×1m) of the measured transient solar simulator is equally divided into 66 areas, with 1-11 in the horizontal direction and A-F in the vertical direction. Place the silicon solar cells in these 66 areas respectively, and use the data acquisition system to collect the short-circuit current change of the silicon solar cells under each flash pulse of the transient solar simulator (converted into a voltage signal by the I-V converter, unit: mV), Thus, the irradiance of the transient solar simulator varies with the position.

According to accompanying drawing 2, it can be drawn that the maximum value is 108.7mV, the minimum value is 104.4mV, and the unevenness (%)=[maximum value-minimum value]/[maximum value+minimum value]×100%=2.0%. According to IEC60904-9:2006, the uniformity of this transient solar simulator belongs to class A.

2. Stability test:

Take a calibrated and packaged monocrystalline silicon solar cell with an area of 12.5cm×12.5cm as the detector, place it at any point in the effective irradiation surface of the transient solar simulator, and select the resistance of the I-V converter as 25 milliohms. Within 40 minutes, use the data acquisition system to collect the current change of the silicon solar cell under multiple flash pulses of the transient solar simulator (converted into a voltage signal by an I-V converter, unit: mV). Gained data is shown in accompanying drawing 3, and its maximum value is 109.5mV, and minimum value is 108.1mV, instability (%)=[maximum value-minimum value]/[maximum value+minimum value]*100%=0.6% . The stability of this transient solar simulator is class A according to IEC 60904-9:2006.

Test case two

The device for testing the uniformity and stability of solar simulator irradiation of the present utility model is used as follows to test the uniformity and stability of irradiation of a steady-state solar simulator used in the production and testing of a photovoltaic enterprise.

1. Uniformity test:

A calibrated and packaged monocrystalline silicon solar cell 1 with an area of 12.5cm×12.5cm is used as a detector, and the resistance value of the I-V converter is selected to be 25 milliohms. Referring to IEC60904-9, the effective irradiation surface (1.1m×1.4m) of the measured steady-state solar simulator is equally divided into 64 areas, 1-8 in the horizontal direction and A-H in the vertical direction. Place the silicon solar cells in these 64 areas, and use the data acquisition system to collect the short-circuit current change of the silicon solar cells under the irradiation of the steady-state solar simulator (converted into a voltage signal by the I-V converter, unit: mV), so as to obtain Variation of irradiance in a solar simulator.

According to accompanying drawing 4, it can be drawn that the maximum value is 126.8mV, the minimum value is 122.2mV, unevenness (%)=[maximum value-minimum value]/[maximum value+minimum value]×100%=1.8%. According to IEC60904-9:2006, the uniformity of this transient solar simulator belongs to class A.

2. Stability test:

Take a calibrated and packaged monocrystalline silicon solar cell with an area of 12.5cm×12.5cm as the detector, place it at any point in the effective irradiation surface of the steady-state solar simulator, and select the resistance of the I-V converter as 25 milliohms. By adjusting the software of the data acquisition system, the current change of the silicon solar cell (converted into a voltage signal by the I-V converter, unit: mV) is collected within 30 minutes of irradiation by the steady-state solar simulator. Gained data is as shown in accompanying drawing 5, and its maximum value is 120.9mV, and minimum value is 118.5mV, instability (%)=[maximum value-minimum value]/[maximum value+minimum value]*100%=1% . The stability of this transient solar simulator is class A according to IEC 60904-9:2006.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, anyone familiar with the technology can easily think of the transformation within the technical scope disclosed in the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (5)

1. one kind is detected solar simulator irradiation uniformity and stable device, it is characterized in that described device comprises:

One silicon cell;

Be connected by an I-V converter between one data acquisition unit, this data acquisition unit and silicon cell;

One computing machine, this computing machine is connected with data acquisition unit.

2. the device of detection solar simulator irradiation uniformity according to claim 1 and stability, the line between wherein said I-V converter and the data acquisition unit is a concentric cable, all there is a joint at the two ends of this concentric cable.

3. the device of detection solar simulator irradiation uniformity according to claim 1 and stability, wherein said silicon cell is monocrystalline silicon or polysilicon, the front of this silicon cell is towards the light source of solar simulator.

4. the device of detection solar simulator irradiation uniformity according to claim 1 and stability, wherein said data acquisition unit comprises a plurality of passages.

5. the device of detection solar simulator irradiation uniformity according to claim 1 and stability, the resistance of wherein said I-V converter is the 10-500 milliohm.

Images