Analysis of Operational Sequences for Congestion Management Measures in Transmission Grids

In the research field of power system operation it is common to approximate the considered period of time based on discretized power flow patterns. However, the efficient utilization of the transmission grid infrastructure demands an increasing amount of congestion management measures, such as topology changes via switching measures or adjustments of phase shifting transformers. Transmission system operators must arrange these measures in a decreasing period of time to take account of an increasingly volatile power system. In order to analyze the trajectory between a current and a future grid state, a 2-stage simulation model is proposed. By applying the model to a test system, it is shown that the transition path is highly dependent on the chosen operational sequence, which is defined as the chronological order of operational measures. The mean loading of specific overhead lines during an exemplary transition path differs by up to 50% depending on the chosen operational sequence.