Time-Based Aggregation of Flexibility at the TSO-DSO Interconnection Point

Abstract

This paper presents a new approach to consider the time-dependent provision of flexibility by RES. In order to achieve an advanced coordination level between grid operators it is essential to consider the increasing penetration of DER, especially at the lower voltage levels. Massive amounts of information are required to reach a complete observability of the grid, therefore, different methodologies to aggregate flexibility within distribution grids have been proposed. In this case, the modelling of Flexibility Providing Units is adapted to consider time-series, while the aggregation process is repeated for several time-steps, which is essential for short-term operation planning of power systems. The proposed method is applied to the European CIGRE MV Grid for two scenarios, a typical summer and winter day. Results show that the load profile over a specific time, the reactive power requirements and the amount of flexibility provided within a grid play major roles in the probability distribution of the operating points of the grid. This has a direct influence on the definition of predefined schedules at the TSO-DSO interconnection point.