NEW EXPERIMENTAL METHOD FOR MEASURING POWER CHARACTERISTICS OF PHOTOVOLTAIC CELLS AT GIVEN LIGHT IRRADIATION

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1 NEW EXPERIMENTAL METHOD FOR MEASURING POWER CHARACTERISTICS OF PHOTOVOLTAIC CELLS AT GIVEN LIGHT IRRADIATION Andrea Varga Óbuda University; Department of Power Systems Bécsi u. 96/b. Budapest H-134 HUNGARY Óbuda University Budapest, 21. Nov

2 Outline Introduction The problem and the way to the new idea New experimental setup and arrangement New results Summary Óbuda University Budapest, 21. Nov

3 INTRODUCTION Óbuda University Budapest, 21. Nov

4 Characteristics of a solar cell Knowing I-U characteristics of a solar cell is determinative at their applications. P MPP can be determined from I-U plot. Óbuda University Budapest, 21. Nov

5 THE PROBLEM WAY TO THE NEW IDEA Óbuda University Budapest, 21. Nov

6 Older experimental method Shematics of the experimental setup Disadvantages: 1. Slow process 2. Manual process, nothing is automatized 3. Low number of saved data 4. Changing experimental conditions during the experimental run (weather) Main properties of the old setup: 1. Discrete resistances in the setup 2. Voltage and current meters were used 3. Manual reading of the meters 4. Manual data recording Goal: new upgraded experimental processes need in order to improve the properties of the old experiment Óbuda University Budapest, 21. Nov

7 New experimental process is needed OLD EXPERIMENT 1. Slow process 2. Manual process, nothing is automatized 3. Low number of saved data 4. Changing experimental conditions during the experimental run GOALS NEW PROCESS should be: 1. Fast 2. Automatized process 3. Possibility to record big amount of data 4. Constant experimental conditions during the experiments Óbuda University Budapest, 21. Nov

8 Newer Experimental Method Scheme of the experimental arrangement Main properties of the new setup: 1. Fast process 2. Semi-automatized process (using data storage oscilloscope) 3. Big amount of data can be recorded (25 data pairs) 4. Constant experimental conditions during the experiments More fast and reliable measurements can be run on more type of solar panels simultaneously. Óbuda University Budapest, 21. Nov

9 Additional step: New adjustable holder for more PV cells New adjustable holder was installed on the roof top of the university building. The holder is able to hold, rotate, tilt more PV cell tables. This way investigation of more solar panels can be performed simultaneously. Purely comparable experimental data for more solar cells Different type of PV cells were investigated: SANYO HIP KORAX RENESOLA UPSOLAR FLEXCELL Óbuda University Budapest, 21. Nov

signals Cables with voltage data signals Measurement places for

10 New experimental arrangement 1st part: the holder with PV cells on the roof 2nd part: in the lab Cables with outlet of voltage signals Cables with voltage data signals Measurement places for more PV cells 3rd part: in the lab Óbuda University Budapest, 21. Nov

One more additional step to improve the new experiment: Irradiation measurement Irradiation Measurement Weather conditions Temperature was

11 One more additional step to improve the new experiment: Irradiation measurement Irradiation Measurement Weather conditions Temperature was close to o C Sky was overcast Sunshine was blocked by dense cloudy Recorded the spektrum of irradiation Óbuda University Budapest, 21. Nov

12 NEW EXPERIMENTAL RESULTS Óbuda University Budapest, 21. Nov

13 Voltage [V] Data evaluation Many plots needed: U-t plots I-t plots Data evaluation process ,25,,25,5,75 1, 1,25 1,5 1,75 2,,4,35,3,25,2,15,1,5, Óbuda University Budapest, 21. Nov

14 current [A] power [W] Voltage[V] Data evaluation I-R plots I-U plots Many plots needed: P-R plots U-t plots P-t plots,4,35,3,25,2,15,1, resistance [Ω],4,35,3,25,2,15,1, ,25,,25,5,75 1, 1,25 1,5 1,75 2, U-I characteristics SANYO HIP voltage [V] 14, 13, 12, 11, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1,, Óbuda University Budapest, 21. Nov

15 current [A] current [A] current [A] current [A] I-U Characteristics of 4 PV cells,4,35,3,25,2,15,1,5,45,4,35,3,25,2,15,1,5 U-I characteristics SANYOHIP voltage [V] U-I characteristics UPSOLAR voltage [V],45,4,35,3,25,2,15,1,5,5,45,4,35,3,25,2,15,1,5 U-I characteristics KORAX voltage [V] U-I characteristics RENESOLA voltage [V] Observations:. plots are similar to the characteristics given by the manufacturer.curve shapes are different for the different type of solar panels.maximum voltages are different for each PV panels Óbuda University Budapest, 21. Nov

16 Summary OLD EXPERIMENT 1. Slow process 2. Manual process, nothing is automatized 3. Low number of saved data 4. Changing experimental conditions during the experimental run GOALS were fulfilled NEW PROCESS should be: 1. Fast 2. Automatized process 3. Possibility to record big amount of data 4. Constant experimental conditions during the experiments Óbuda University Budapest, 21. Nov

17 Acknowledgment Thanks for attention Óbuda University Budapest, 21. Nov

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