Fluctuations in the combined power output from geographically distributed grid coupled wind energy conversion systems - an analysis in the frequency domain.

Abstract

On the basis of hourly wind speed data for 4 North-West German sites an investigation of the time series of the combined power output of geographically distributed wind turbine generator arrays were carried out. The variance of power output and the distribution of hourly gradients were analysed as characteristic parameters. A model for the cross spectra of pairs of sites was developed in order to estimate the spectral density of array power output. The analysis in the frequency domain shows that the considerable reduction of power steps in array output constitutes the main benefit of dispersed wind power generation systems. (A)