Security-constrained active power curtailment considering line temperature and thermal inertia

A novel method is introduced to determine cost-optimized active power curtailment (APC) of renewable energy sources (RES) considering weather-dependent dynamic line rating (DLR). A new formulation of the security-constrained optimal power flow (SC-OPF) is developed and applied in a case study. The reduction of the required preventive APC in the (N-0) case for (N-1) secure grid operation due to the consideration of thermal inertia of overhead power lines is demonstrated. Considering thermal inertia allows relying on curative APC that is activated only after an (N-1) situation occurs. The overhead power line temperature, calculated with the temperature-dependent power flow (TDPF), acts as a new limit for line loading and releases unused transmission reserves. The TDPF algorithm is integrated in the open-source Python library pandapower, providing access to it to the broader community. The power system can be utilized to a greater extent, with a reduced demand for congestion management.