Impact of dynamic line rating on redispatch

This paper analyzes the impact of dynamic line rating (DLR) on both redispatch amounts and costs in Germany for a best and a worst case redispatch scenario in 2020. The basic methodology is divided into three steps: First, hourly weather dependent maximal ampacities of overhead lines are derived in order to analyze the impact of DLR. Uncertainty issues regarding forecast errors or measurement problems are thereby addressed by using weather data of larger or smaller areas around the overhead lines and wind velocities in different heights. Second, by mapping the load and generation schedules of seven European countries (CWE+CH) to their transmission grid nodes, hourly grid congestions in Germany are identified with a DC power flow. Third, German redispatch amounts and costs are calculated by applying a modified Optimal Power Flow which takes the beforehand determined plant schedules and technical restrictions into account. The results reveal significant reduction potentials of redispatch amounts and costs even under consideration of the least positively influencing weather conditions.