Recursive Hosting Capacity Region Assessment to Further Unleash Grid Power Potential

Evolving from the notion of "hosting capacity", hosting capacity region defines a combined feasible region in the operational space given by various installations in radial grids. Within the region, all operation points adhere to power flow outcomes that meet the criteria for grid voltage and current limitations. By synchronizing operations among these installations, this region helps to fully unleash the grid power potential. Enlightened by computational geometry, the region can be quickly assessed by computing an asymptotic convex polytope, while with inherent accuracy loss due to the necessity for an inner approximation.

To enhance the region approximation accuracy, this paper introduces a recursive assessment approach, where the current-related elements in the exact grid model will be refined iteratively. Unlike the conventional approach of relaxing the cable current to its nominal threshold, the iterations aim to suppress such upper bound by calculating maximal cable current of all extreme points within the previously assessed region.
This generates a grid model with stricter relaxation, eventually contributing to higher region accuracy. Case studies implemented on a 10.5 kV Dutch grid model have confirmed the efficacy of the proposed scheme, which reduces 23.29% assessment accuracy loss compared to the state-of-art scheme in current literature.