CN102680874A - Pulse solar simulator flash synchronous test method - Google Patents

Abstract

The invention discloses a flash synchronous testing method of a pulsed solar simulator, which uses the light intensity change caused by the flash of a pulsed solar simulator, and adds a short-circuit current jump to the standard solar cell short-circuit current test of an irradiance probe Detection, synchronously trigger short-circuit current test function, complete reliable short-circuit current test within less than the flash time, in order to realize the short-circuit current characteristic calibration of the standard solar cell in the irradiance probe, and reduce the short-circuit current of the standard solar cell in the irradiance probe Testing and metering costs.

Description

A pulsed solar simulator flash synchronization test method

technical field

The present invention relates to a method for measuring and testing the short-circuit current characteristics of a standard solar cell in an irradiance probe in the field of photovoltaic testing, specifically a pulse-type solar simulator flash synchronization testing method.

Background technique

Currently, in the field of photovoltaic testing, there is a volt-ampere characteristic tester for outdoor photovoltaic module testing. The volt-ampere characteristic tester is used to test the volt-ampere characteristics of photovoltaic modules under sunlight. The volt-ampere characteristic tester is generally equipped with an irradiance probe to record the solar radiation intensity at that time. The irradiance probe mostly uses the short-circuit current test of a standard solar cell to test the irradiance of the light. In addition, the irradiance probe is used to adapt to Field testing requires that the standard solar cell in the probe is packaged with the test circuit, and does not provide the current test analog port of the standard battery, but sends the irradiance test value directly to the host of the volt-ampere characteristic tester in digital mode.

During the measurement test of the irradiance probe, a stable and controllable measurement environment must be established. Obviously, it cannot be carried out under sunlight, and a simulated sunlight environment must be established. In this case, to measure the accuracy of the irradiance probe test, it cannot be measured by the traditional volt-ampere characteristic test method by connecting the test cable to the probe. This method uses a steady-state or pulsed solar simulator to generate a certain Intensity of light, use the electronic load to scan the volt-ampere characteristics of the standard solar cell during the program-controllable light time, so as to obtain the short-circuit current test value, and then deduce the corresponding irradiance value. If there is no test cable connected, if you want to use the pulsed solar simulator to test the standard battery short-circuit current in the probe, since the probe has its own test circuit, it cannot be compared with the ms-level flash of the pulsed solar simulator. Synchronous, so the pulsed solar simulator cannot be used for probe calibration, only the steady-state solar simulator can be used to generate constant light, providing continuous light similar to the outdoors of the irradiance probe, meeting the test time of the internal test circuit Requirements, no need to establish a synchronization relationship. However, the current price of the steady-state solar simulator is very expensive, and the cost of use is very high. As a result, only a few measurement research units can be equipped with it, and it can only be used for a small amount of standard solar cell calibration, and cannot be extended to general irradiance probe production tests. middle.

Contents of the invention

The purpose of the present invention is to provide a pulsed solar simulator flash synchronization test method to solve the problem in the prior art that when measuring the short-circuit current of the standard battery in the irradiance probe, only the steady-state solar simulator can be used and the pulse cannot be used. Type solar simulator, which in turn affects the production and testing of general irradiance probes.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A pulse type solar simulator flash synchronous testing method is characterized in that comprising the following steps:

①. Attach the standard solar cell surface of the irradiance probe to the light platform of the pulsed solar simulator, and use a volt-ampere characteristic tester to detect the short-circuit current value of the standard solar cell with a certain detection cycle;

②. Use the built-in software of the pulsed solar simulator to generate a flash pulse with a certain light intensity. When the current change in the two adjacent detection cycles of the irradiance probe reaches the set current change threshold (1), the short-circuit current is triggered. test thread;

③. The volt-ampere characteristic tester automatically delays to wait for the short-circuit current to reach a stable state. When the short-circuit current reaches a stable state, the volt-ampere characteristic tester tests the short-circuit current value under the current irradiance, records the test results, and ends the test thread ;

④. Calculate the current irradiance value according to the short-circuit current value, so as to calibrate the short-circuit current characteristics of the standard solar cell in the irradiance probe according to the irradiance value measured by the pulsed solar simulator, so as to facilitate industrial production and testing .

The flash synchronization testing method of the pulsed solar simulator is characterized in that: the detection period of the volt-ampere characteristic detector is shorter than the flashing time of the pulsed solar simulator.

The flash synchronization testing method of a pulsed solar simulator is characterized in that: the threshold (1) is one-tenth of the short-circuit current under the light intensity of 1000W/m2.

The beneficial effects of the present invention are:

The present invention can use the relatively cheap pulsed solar simulator to realize the measurement work of the irradiance probe that originally needs an expensive steady-state solar simulator, so that the mass production of the irradiance probe can be reliably guaranteed, and the testing and metering costs.

Description of drawings

Figure 1 is a schematic diagram of the flash pulse and the short-circuit current change of the solar cell.

Detailed ways

As shown in Figure 1, the upper curve is the flash pulse of the pulse solar simulator, and the lower one is the current change diagram of the standard solar cell, (1) is the current change threshold, (2) is the delay relative to the start time of the flash, (3) is the artificially added delay, and (4) is the sampling interval of the current value. From the start of the flash to the steady irradiance, and then to the stop of the flash, the light pulse time is 10ms.

The detection process includes the following steps:

①. Attach the standard solar cell surface of the irradiance probe of the volt-ampere characteristic tester to the light platform of the pulsed solar simulator, and use the volt-ampere characteristic tester to detect the short-circuit current value of the current solar cell with a test period of 50 ns ;

②. Use the built-in software of the pulsed solar simulator to generate a flash pulse with a certain light intensity. The flash time is about 10ms. When the current change in the two adjacent detection cycles of the irradiance probe reaches the set current change threshold (1 ), trigger the short-circuit current test thread;

③. The time from the flashing of the pulsed solar simulator to the triggering of the short-circuit current test thread (2) generally does not exceed 1ms, and then the volt-ampere characteristic tester will automatically delay (3) 2ms, waiting for the short-circuit current to reach a stable state;

④. When the short-circuit current reaches a stable state, the volt-ampere characteristic tester will complete the test of the short-circuit current value under the current irradiance within the next 2ms to 3ms (4), record the test results, and end the test thread;

⑤. Calculate the current irradiance value according to the short-circuit current value, so as to calibrate the short-circuit current characteristics of the standard solar cell in the irradiance probe according to the irradiance value measured by the pulsed solar simulator, so as to facilitate industrial production and testing .

Claims (3)

1. pulsed solar simulator flash synchronization method of testing is characterized in that may further comprise the steps:

1., the standard solar cell face of irradiance probe is close on the illumination platform of pulsed solar simulator, adopt the short-circuit current value of Testing Instrument for Volt-ampere Characteristic with certain sense cycle examination criteria solar cell;

2., utilize the pulsed solar simulator to produce the flash pulse of certain light intensity, when electric current in adjacent two sense cycle of irradiance probe changes the electric current that reaches setting and changes thresholding (1), trigger short-circuit current test thread;

3., the Testing Instrument for Volt-ampere Characteristic automatic time delay reaches steady state (SS) to wait for short-circuit current, when short-circuit current reached steady state (SS), Testing Instrument for Volt-ampere Characteristic was tested short-circuit current value under the current irradiance, logging test results finishes the test thread;

4., extrapolate current irradiance value, thereby the short-circuit current characteristic of irradiance probe internal standard solar cell is demarcated, so that commercial production and test according to the irradiance value of pulsed solar simulator metering according to short-circuit current value.

2. a kind of pulsed solar simulator flash synchronization method of testing according to claim 1, it is characterized in that: the sense cycle of said volt-ampere characteristic detector is less than the flash time of pulsed solar simulator.

3. a kind of pulsed solar simulator flash synchronization method of testing according to claim 1 is characterized in that: thresholding (1) is 1/10th of the short-circuit current under the 1000W/m2 intensity of illumination.

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