Abstract
Recently, outdoor photovoltaic (PV) module performance characterizations have been carried out mainly for testing installed PV modules. For high-accuracy outdoor measurement, solar irradiance with stability in time and uniformity in space are required. Short-period temporal instability and spatial nonuniformity of solar irradiance are observed using a series of PV module sensors (PVMSs). The speed and direction of cloud shadows moving on PVMSs are evaluated from the fluctuations of irradiance detected by several PVMSs. On the basis of cloud distribution, weather conditions are classified into four types, and the characteristics of solar irradiance fluctuations are examined for each type. The irradiance changes quickly under cumulous clouds. On the other hand, the irradiance becomes weak, but its short-period fluctuations are not evident under layered clouds. The amplitude of irradiance fluctuations reaches 70% of clear-day irradiance at noon in this observation. The spatial nonuniformity evaluated on the basis of the instantaneous difference in irradiance intensity between two PVMSs also reaches 1.8%/m of clear-day irradiance.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
