Security-Constrained Active Power Curtailment Considering Line
Temperature and Thermal Inertia
We introduce a novel method 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. We demonstrate 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.
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, acts
as a new limit for line loading and releases unused transmission
reserves. The power system can be utilized to a greater extent, with a
reduced demand for congestion management.