Beyer, Hans Georg Repercussions of interannual variability in irradiance on sizing PV for autonomous renewable energy systems

When sizing the components of renewable energy systems to be able to cover the load with a certain
security of supply the selection of the data meant to represent the meteorological conditions governing the systems
performance plays a decisive role. Current approaches comprise either to select or construct years assumed to present
typical statistical properties or years assumed to present the most challenging conditions in view to assure a high degree
of load coverage by the renewables up to a 100%. When aiming at systems approaching the complete load coverage by
renewables it is obvious that long-term data sets must be considered to identify those condition. Here, a long-term data
set is applied to examine the lay-out of a PV system assisting the electricity system of the Faroe Islands. For this
example, the identification ot the most chalanging conditions in a 56-years set and the conseqences of the use of
incomplete sets in view of the occurence of deficit situations is discussed.
Keywords: island systems, sizing, meteorological data