The grid frequency is measured every half second during 2020, in Tokyo, Japan, which is a part of 50 Hz area of Japan. 317 days are measured with the DEIF MTR-3.
49 days are not measured. The MTR-3 has an accuracy of 10 mHz There is one column with the UNIX timestamp in milliseconds and one column with the frequency measurement. The dataset has a fixed sample rate of 0.5 s, and missing samples are replaced with NaN so there are 24*7200*366=63,244,800 rows in the set.
Funding
EUDP PROJECT ACES - ACROSS CONTINENT ELECTRIC VEHICLE SERVICES (GRANT EUDP17-I-12499, WEBSITE: WWW.ACES-BORNHOLM.EU).