Study of the dependence between the simultaneous wind speed and the global solar radiation measurements using the Time dependent Intrinsic Correlation method

Abstract:

Wind and global solar radiation are complex atmospheric processes exhibiting nonstationary and nonlinear properties, involving with a high level intermittency degree on a broad range of spatial and temporal scales. It has been shown recently that the wind speed and the solar global radiation had intermittent and multiscaling statistics on mesoscales range.
The emergence of electricity production units combining renewable wind and solar energy generation, need the understanding of the dependence between these two processes. The interest is to develop strategic tools in order to smooth the aggregate power output of this kind of electricity production unit.
In this study, we study their multi-scale dynamics and we investigate possible correlations at different scales using a new methodology called Time Dependent Intrinsic Correlation (TDIC) based on the EMD (Emiprical Mode Decomposition) method. For that, the Time Dependent Intrinsic Correlation method is applied to simultaneous wind and global solar radiation measurements. The two time series are collected with a sampling time t=1h during five years at Guadeloupean Archipelago (French West Indies) located at 16°15'N latitude and 60°30'W longitude. After decomposition of both times series in fast and slow fluctuations with the EMD method, the Hilbert spectra are estimated for the both time series. The time evolution and the scale dependence of their correlation are determined at different time scales and for different intrinsic modes functions.