  Low levels of inertia due to increasing renewable penetration bring several
challenges, such as the higher need for Primary Frequency Response (PFR). A
potential solution to mitigate this problem consists on reducing the largest
possible power loss in the grid. This paper develops a novel modelling
framework to analyse the benefits of such approach.
  A new frequency-constrained Stochastic Unit Commitment (SUC) is proposed
here, which allows to dynamically reduce the largest possible loss in the
optimisation problem. Furthermore, the effect of load damping is included by
means of an approximation, while its effect is typically neglected in previous
frequency-secured-UC studies. Through several case studies, we demonstrate that
reducing the largest loss could significantly decrease operational cost and
carbon emissions in the future Great Britain's grid.
