Zusammenfassung
measure solar irradiation and photovoltaic array output energy a
measuring accuracy cannot be guaranteed unless the data sampling
interval is appropriately selected. From this viewpoint, actual irradiance
has been measured by comparatively high speed sampling of l-4 s for
44 months and the daily errors of the numerical integral have been
estimated for various step sizes. Approximation formulae of the error
versus the step size have been statistically obtained as well as
their probability density function covering +4c. Finally, a nomograph
is presented to decide an appropriate sampling interval. A concluding
example shows that the deviating component of the error exceeding
+ 1% can happen once for every 1 month or 6 months if the step size
is selected as 105 or 65.5 s, in each of which the total error becomes
-0.0485 k 1% or -0.0336& 1% including an average error component
according to the data measured at Tsukuba.
Nutzer