Shortly before the overshoot frequency - 50.193 Hz on 24.01.2019.
On the morning of 01/24/2019 at 0600 hours, there was a brief overshoot of frequency in the European power grid. The frequency averaged over 1 second in some places was briefly 50.193 Hz, so it was close to the 50.2 Hz limit. In the power grid, overfrequencies occur when more power is fed in by power plants than is demanded by consumers at that exact moment.
The magnitude of the frequency deviations varied by region. We recorded the strongest swing at our measurement facility in Vienna, where the frequency rose to 50.193 Hz in some cases, while at other stations we measured around 50.175 Hz at the peak. We do not yet know the cause of this phenomenon. The event did not constitute a disturbance according to ENTSO-E criteria (Section 6.5.5), because the frequency remained within the intended control range of 49.8-50.2 Hz (Section 3.). The occurrence of this frequency overshoot, as well as the underfrequency event that occurred on 01/10/2019, were both still within the control range, but arguably should be considered unusual due to the temporal proximity and expression of the frequency deviation.
Status 01/27/2019