Common Grid Model
To guarantee the effcient operation of the end-to-end electrical systems, transmission system operators (TSOs) need complex operational planning approaches across time horizons from several years to the day ahead of delivery; at hourly intervals on the day of delivery as well as in real time.
These complex operational planning processes, require TSOs to build mathematical models of their grid through consistent data structures. These models allow them to run situational awareness simulations of their grids integrating market schedules with representations of the different elements of infrastructure in service. This simulation process is continuous and iterative across the various time horizons. It ensures constant optimisation of the grid usage while maintaining the security of the system, and thus of electricity security of supply.
The ultimate objective is to have the highest quality forecasts of electricity ows across the pan-European electrical system.
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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.