DE102014003814A1 - Method and arrangement for testing photovoltaically operating solar modules - Google Patents

Abstract

Method for testing photovoltaic solar modules, in which a comparative measurement is performed by equipping the solar module (2) to be tested together with a reference solar module (3) of the same type and the electrical power of the test (2) and the reference module (3) successively measured and compared computationally, and in case of a shortfall of a predetermined limit for the solar module to be tested (2) this discarded and the measurement result is logged.

Description

The invention describes a method that allows installers of photovoltaic modules to check on-site as to whether the modules provide the performance values as stated by the manufacturer.

Currently, assemblers must have expensive laboratory tests done under artificial light conditions to prove to a manufacturer that some of the delivered modules do not meet the manufacturer's specified performance parameters. These costs for laboratory tests often exceed the original price of a module, so that many assembly companies do without laboratory tests.

Furthermore, measurements are locally known against a sensor. However, these have the disadvantage that the measurement results have a high degree of inaccuracy due to radiation, temperature and spectrometry.

The object of the invention is to propose a measuring method which allows a reliable performance evaluation of the solar modules to be installed suburb.

This object is achieved with the features of method claim 1. An arrangement designates claim 6. Advantageous embodiments are the subject of the dependent claims.

According to the invention, a method for testing photovoltaically operating solar modules is proposed in which a comparative measurement is performed by setting up the solar module to be tested together with a reference solar module of the same type and aligned and the maximum electrical power (MPP maximum power peak) of the test to be tested and the reference module are determined sequentially from the precisely measured characteristic curve and compared computationally, and when falling below a predetermined limit for the solar module to be tested, this is scrapped or even selected and the measurement result is logged.

In both performance measurements, a reference cell is used to check whether the irradiance of the two solar modules was identical or within a permissible deviation at the time of the respective measurement. This result is logged.

Furthermore, the temperature of the module to be tested and of the reference solar module is measured by means of temperature sensors and it is checked whether the module temperature for the respective measurements for determining the electrical power was identical or within a permissible deviation. This result is also logged.

In the case of deviations of the irradiance or of the temperature beyond a predefined limit, the method provides for repeated measurements both in the test solar module and in the reference solar module, or to classify the measurement as inadequate.

Furthermore, the method specifies that when a minimum irradiance is undercut, the measurement is classified as insufficient, i. H. no evaluation of the performance of the test module is possible.

Furthermore, it is provided that by means of a bar code scanner at least the module serial number of the solar module to be tested is detected and logged.

The logged measurement results enable the assembly companies to supply the laboratories or the manufacturer with modules of inferior quality with a high hit rate.

Another advantage is that the measurements can be made under otherwise unfavorable lighting conditions. Experiments have shown that 30 photovoltaic modules per hour can be measured without problems. The measurements are very accurate due to the measurement techniques used in the field and are further improved by the application of recognized software algorithms.

An advantage of this type of measurement is that it is simple in design.

The invention will be explained with reference to the drawing.

The 1 shows a measuring station, with which the assembly company can check the quality of the solar modules, in particular their electrical performance, suburb to disqualify performance-impaired solar modules before assembly or examination dates.

The measuring arrangement consists of a frame 1 in which the solar module to be tested 2 and the reference solar module 3 next to each other with the same employment (in the same plane) can be set up. The frame is preferred 1 made of aluminum and collapsible.

In the immediate vicinity of the solar modules 2 . 3 is the input, measuring and display device 9 , This is electrically conductive with the electrical outputs 7 . 8th the two solar modules 2 . 3 connected. There are also connection connections to the temperature sensors 4 and 5 behind the two solar modules 2 . 3 and the reference cell 10 , which is located in the same level as the PV modules, experiences virtually the same irradiation situation as the PV modules.

Via a barcode reader 6 is simply the serial number of the solar module to be tested 2 can be collected and prepared. Considering the length of the serial numbers, this also reduces the input error rate.

The in the input, measuring and display device 9 incoming data is here by the arithmetic unit 14 processed.

Furthermore, stand the arithmetic unit 14 the data from the on the input, measuring and display device 9 arranged reference cell 10 about the irradiance available at the time of each measurement.

The electrical power of the module to be tested and the reference module 2 . 3 can be measured one after the other and compared computationally. In case of falling below a predetermined limit for the solar module to be tested 2 this is retired and the measurement result is logged.

In both power measurements is by means of the reference cell 10 Check if the irradiance of the two solar panels 2 . 3 at the time of measurement was identical or within a permissible limit. This result is also logged.

By means of temperature sensors 4 . 5 becomes the temperature of the module to be tested and the reference solar module 2 . 3 during the power measurement and checked whether the temperature was identical for the respective measurements of the electrical power or was within a permissible limit range. This result is also logged.

• 1. rot – das geprüfte Solarmodul entspricht deutlich nicht den Herstellerangaben, ist somit auszumustern,
• 2. grün – das geprüfte Solarmodul entspricht den Herstellerangaben und kann verarbeitet bzw. weiter genutzt werden,
• 3. gelb – die Messung muss wiederholt werden, weil es unzulässige Abweichungen bei der Bestrahlungsstärke oder der Temperatur bei der Messung gab, die Bestrahlungsstärke zu gering oder die Abweichung der Messergebnisse der beiden PV-Module zu gering ausgefallen ist

In the simplest case shows the input, measuring and display device 9 three signals to:

• 1. red - the tested solar module clearly does not correspond to the manufacturer's specifications, so it has to be rejected,
• 2. green - the tested solar module complies with the manufacturer's instructions and can be processed or used further,
• 3. yellow - the measurement must be repeated because there were unacceptable variations in the irradiance or the temperature during the measurement, the irradiance was too low or the deviation of the measurement results of the two PV modules was too low

Through the planned solar module database 11 in the input, measuring and display device 9 In addition, further data regarding the performance of the solar modules to be tested 2 to be taken into account.

The in the store 12 the arithmetic unit 14 stored data can be retrieved and printed, are thus available as a test report in case of a defect.

It is understood that the input, measuring and display device 9 a regular calibration is required to make the measurement results unassailable.

LIST OF REFERENCE NUMBERS

1

frame

2

to be tested solar module

3

Reference solar module

4

temperature sensor

5

temperature sensor

6

barcode reader

7

electrical outputs of the solar module to be tested

8th

electrical outputs of the reference solar module

9

Input, measuring and display device

10

reference cell

11

Solar module database

12

Storage

13

power supply

14

computer unit

15

screen

Claims (7)

Method for testing photovoltaic solar modules, in which a comparative measurement is performed by the solar module to be tested ( 2 ) together with a reference solar module ( 3 ) of the same design and that the electrical power of the test ( 2 ) and the reference module ( 3 ) are measured one after the other and compared computationally, and when a predefined limit value is undershot for the solar module to be tested ( 2 ) This is retired and the measurement result is logged. A method according to claim 1, characterized in that in both power measurements by means of a reference cell ( 10 ), it is checked whether the irradiance of the two solar modules ( 2 . 3 ) at the time of the measurement was identical or within a permissible limit range and this result is logged. Method according to claim 1 or 2, characterized in that by means of temperature sensors ( 4 . 5 ) the temperature of the test ( 2 ) and the reference solar module ( 3 ) is measured and checked whether the temperature was identical or within a permissible limit for the respective measurements of electrical power and this result is logged. A method according to claim 2 or 3, characterized in that in case of deviations of the irradiance or the temperature above a predetermined limit beyond a repeated measurement both in the examined ( 2 ) as well as the reference solar module ( 3 ) is made. Method according to one of claims 1 to 4, characterized in that by means of a bar code scanner ( 6 ) or a keyboard at least the module serial number of the solar module to be tested ( 2 ) is recorded and logged. Arrangement for carrying out the method according to claim 1, with a frame ( 1 ), in which the ( 2 ) and the reference solar module ( 3 ) can be set up side by side with the same orientation and with an input, measuring and display device ( 9 ) with at least connection connections ( 7 . 8th ) to the electrical outputs of the test ( 2 ) and the reference solar module ( 3 ), Connection terminals to temperature sensors ( 4 . 5 ), at least one of each to be tested ( 2 ) and one at the reference solar module ( 3 ) and connected to a barcode reader ( 6 ) as well as at least one reference cell ( 10 ) for measuring the irradiance of the test ( 2 ) and the reference solar module ( 3 ) at the time of measuring the electrical power, and wherein the input, measuring and display device ( 9 ) via at least one memory ( 12 ), a power supply ( 13 ), a computing unit ( 14 ) and a screen ( 15 ). Arrangement according to claim 7, characterized in that the input, measuring and display device ( 9 ) via a manually modifiable solar module database ( 11 ) with the data sheets of the module manufacturers to which the arithmetic unit ( 14 ) Has access.

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