Abstract
To compare the performance of PV modules, it was required to translate the measured I - V characteristics, to use certain standard conditions. The International Electrotechnical Committee (IEC) has defined the standard test condition (STC) for PV modules with 1000 W/m2 irradiance with AM 1.5 and 25°C module temperature. The IEC has also published some standard correction procedures (contained in IEC 60891) to translate irradiance and temperature values between different. IEC 60891 defines a procedure which helps to translate the measured I-V characteristics photovoltaic devices at standard test condition (STC). The IEC 60891 translation procedures can be applied only for the 20% variation in the irradiance, the irradiance should not be below 800 W/m2 for translation at STC but also for limit temperatures (35 ° VS). In our study we will use crystal technology and the temperature measurements carried out at the study site show temperatures varying from 55°C to 65°C. Data from tests in the wild has been converted to standard test conditions (STC) using four methods proposed by AJ Anderson and G. Blaesser, the combination method and the equations from international standard IEC 60891. These methods are compared using data from one year and the correlation between the measured data and the standardized data. The results demonstrated that the combination method has good precision in the STC conversion of the performance of the PV module under different climatic and technological conditions. Then, based on the investigation results of the conversion equations, these translation methods are distinguished by the type of solar cell technology and the field of application. There is a difference between in situ and natural tests, attributed to various factors but mainly to the mismatch between the spectral responses of the PV module and the reference solar cell. The combination method uses irradiance data and temperature and performance parameters under STC conditions of PV modules to predict the maximum output power. Therefore, it is essential to provide reliable weather data before designing photovoltaic power systems.
Highlights
Recent studies have shown that 83% of solar photovoltaic (PV) modules are made from crystalline silicon solar cells [1]
The photovoltaic modules are installed in a real environment where the operating conditions are very different from standard test condition (STC) conditions
We have studied four methods of PV modules using the irradiance and ambient temperature data (G; Ta) and the intrinsic performance parameters of the PV module in STC conditions (Isc; Voc; fill factor (FF); v; /; w, ) examining the performance of the models is performed by comparing the measured values of the maximum power output and those calculated by the different models studied (Figures 1, 2, 3, 4)
Summary
Recent studies have shown that 83% of solar photovoltaic (PV) modules are made from crystalline silicon solar cells [1]. The photovoltaic modules are installed in a real environment where the operating conditions are very different from STC conditions. Photovoltaic technologies behave differently with changing weather conditions. Several authors have suggested models to predict performance of photovoltaic modules in real operating conditions [2, 3, 4]. Module I-V data were measured at different conditions of irradiance and temperature. In order to compare their performance, it was required to translate the measured I-V data to some standard condition. International Electrotechnical Committee (IEC) has defined standard test condition (STC) for PV modules as 1000 W/m2 irradiance with AM 1.5G spectrum and 25°C module temperature.
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