Statistical Correlation between Wind Penetration and Grid Frequency Variations in the Irish Network

The focus of this paper is to determine whether the penetration of non-synchronous generation and the magnitude of system frequency fluctuations show any statistical correlation. The study is performed using measurement data taken along four years, from 2014 to 2017. Frequency data have been recorded in the authors' lab with a Frequency Disturbance Recorder, whereas archival wind generation data have been provided by EirGrid Group, the Irish transmission system operator. The all-island Irish transmission system appears to be particularly appropriate for this kind of studies as non-synchronous generation, mostly from wind power plants, can supply to 65% of the instantaneous demand. Results show that the standard deviation of the frequency of the grid is highly correlated to the share of wind penetration.