2026-10-14T21:49:01Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33820660 2026-09-15T19:57:04Z portal_1197 item_type_3 month_year_09_2026

National Grid frequency trace Robert S. MacKay (24749182) Frequencies of oscillating systems National Grid Company Electric power systems Linear models (Statistics) Stochastic processes -- Mathematical models Migrated from ePrints The dataset provides the GB grid frequency every second for two hours (02.00-04.00) on 1 September 2015 (at some location that I do not remember). I used it to test some linear stochastic process models for the frequency as a function of time. On the 2-hour timescale the trace fit reasonably well to an Ornstein-Uhlenbeck (OU) process with a decay time of around 30 minutes. On a shorter timescale, in particular the first 3 minutes 20 seconds, the trace looked smooth so I fitted it to a first-order filtered OU process, which gave me time constants of 11 minutes and 1.9 seconds. This was important evidence that a useful model for power imbalance as a function of time is a filtered white noise. Furthermore, the power spectrum of the 2-hour trace showed a regime with slope around -4 for periods shorter than 25 seconds, consistent with being a first-order filtered OU process, until the Nyquist cutoff at 2 seconds.<br><br>Data record consists of the raw data in an attached spreadsheet. The dataset provides the GB grid frequency every second for two hours (02.00-04.00) on 1 September 2015 (location undisclosed). The data were publicly available from National Grid (http://www2.nationalgrid.com/Enhanced-Frequency-Response.aspx) at the time of original download. No changes have been made to the data. The data are in an excel file with three columns: date (DD/MM/YEAR), time (HH:MM:SS), frequency (Hz). A graph is also provided. 2026-09-15T19:57:04Z Dataset Dataset 10.82444/warw.33820660.v1 https://figshare.com/articles/dataset/National_Grid_frequency_trace/33820660 CC BY 4.0