Merge pull request #10 from radekludacka/grid-frequency-databases

List of actual and historical grid enf frequencies

electrical-network-frequency-analysis/enf-signal-databases.md

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+# Available enf signal databases
+
+### United Kingdom
+https://www.nationalgrideso.com/balancing-services/frequency-response-services/historic-frequency-data
+
+https://data.nationalgrideso.com/system/system-frequency-data
+
+https://gridwatch.co.uk/frequency - actual grid frequency
+
+https://www.dynamicdemand.co.uk/grid.htm# - actual grid frequency
+
+### USA
+FNET - not known if data are publicly available, but probably available by requests
+
+http://fnetpublic.utk.edu/index.html
+
+https://github.com/LRydin/Power-Grid-Frequency
+
+### Nordic grid - Finnland, Sweden, Norway, Island
+https://data.fingrid.fi/en/dataset/frequency-historical-data
+
+https://osf.io/86naf/
+
+### Continental Europe - UCTE
+https://osf.io/by5hu/wiki/home/ 
+
+https://arxiv.org/pdf/2006.01771.pdf - osf data description
+
+https://www.mainsfrequency.com/index.htm - actual grid frequency
+
+https://www.swissgrid.ch/de/home/operation/regulation/frequency.html - actual grid frequency
+
+https://github.com/LRydin/Power-Grid-Frequency
+
+### Grid radar
+Restricted free access. Similar location like osf data.
+
+https://service.gridradar.net/index.php?menu=doc#examples
+
+### Countries list and their grid frequency
+https://www.generatorsource.com/Voltages_and_Hz_by_Country.aspx
+
+https://en.wikipedia.org/wiki/Mains_electricity_by_country