|Investigation of Accuracy of various STC Correction Procedures for I-V Characteristics of PV Modules Measured at Different Temperature and Irradiances|
|Yogeswara Rao Golive1, Hemant K. Singh1, Anil Kottantharayil1, Juzer Vasi1, Narendra Shiradkar1
1National Centre for Photovoltaic Research and Education, Indian Institute of Technology Bombay, Mumbai, India
/2National Renewable Energy Laboratory, Golden, CO, United States
This paper presents a simulation study to estimate the accuracy of various STC correction procedures as a function of irradiance and temperature in field. The normalized errors in maximum power (Pmax) in STC correction for the IEC 60891 procedure 1, Modified IEC 60891 procedure 1 and Standard Irradiance and Desired Temperature (SIDT) procedures were compared at various irradiances and temperatures. Also, the most accurate method to predict I-V characteristics of modules based on single diode model was identified by comparing eight different methods. The IEC 60891 procedure 1 was found to have least normalized error, however it is not always suitable in field as it requires I-V data at various temperatures and irradiances. . Out of the remaining two procedures Modified IEC 60891 1 procedure is having lowest normalized error compared to SIDT in the range of temperature (50 0C to 75 0C) and irradiance (700 W/m2 to 1000 W/m2) which are typically encountered in outdoor measurements.