Design Of The Test Experimental Teaching Platform Of Solar Cell Based On Virtual Instrument

Since the 21 st century, with the increasingly serious energy crisis and environmental problems, the use of solar cells for solar energy development and use has been widespread concern around the world. Accordingly, the solar industry has entered a period of rapid growth, and thus the market called an urgent need from solar cell test solutions. Meanwhile,experimental teaching at major universities, the solar cell parameters of the experimental test has become increasingly common. Therefore, the development of a high-performance solar cell test system suitable for experimental teaching has very important significance.In this paper we designed and developed a stable performance, modular solar cell testing platform.The entire test system consists of two parts, hardware and software.In the hardware section,we completed the selection and design of the solar simulator, the thermostatic sample stage,the test circuit and the data acquisition&display module. The solar simulator choose short-arc xenon lamp as the light source to simulated the sunlight,the lamp housing and shape structure was designed and machined. By testing,AM1.5 sunlight energy requirements was reached; the thermostatic sample stage make the test platform achieve a constant 25 ? by using semiconductor cooling plate assembly; the test circuit achieve resistance compensation by using compensation act;the data acquisition&display module together data PCI8735 acquisition card and computer to achieve its function.In the software section, make the virtual instrument as a development tool and use LabVIEW software platform for programming, to achieve automatic data collecting from the circuit and completed the real-time rendering and display of the solar cell's IV characteristics curve, as well as the tracing calculations of the solar cell's open circuit voltage, short circuit current, maximum power point, fill factor and photoelectric conversion efficiency and other parameters.By using this test platform,we conducted a number of repeated tests on the same solar cell.By comparing the results with the precision test equipment,our test platform's good stability and good repeatability can be seen.Maximum open circuit voltage and short circuit current's measurement error was less than 1%,fully meet the requirements of the experimental accuracy.The system can depict the real-time IV characteristics curve of the solar cell and calculate its performance parameters. On the other hand, this test platform has a high operability, is very suitable for laboratory teaching.