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System Operation Reports

Deterministic Frequency Deviation

Within the last ten years, and in parallel with the development of electricity markets, a new phenomenon has been observed. This phenomenon consists in a significant deviation of the system frequency from the set point called Deterministic Frequency Deviation (DFD). The time periods in which the current system frequency considerably deviate from 50 Hz have been continuously increasing during load ramping hours; in the morning and in the evening.

A joint Ad hoc working group composed of experts from SOC, MC and EURELECTRIC has been set up in order to analyse the origin of the deterministic frequency deviations; to evaluate impact; and to propose mitigation solution. The results and recommendations of the analysis are concentrated in two reports. While the first report is focused on the root causes of DFD, the main target of the second report is to analyse and propose counter measures and assess their impact.