  In this paper we consider a possibility of stabilizing very fast
electromagnetic interactions between Inverter Based Resources (IBRs), known as
the Control Induced System Stability problems. We propose that when these
oscillatory interactions are controlled the ability of the grid to deliver
power to loads at high rates will be greatly increased. We refer to this grid
property as the dynamic grid loadability. The approach is to start by modeling
the dynamical behavior of all components. Next, to avoid excessive complexity,
interactions between components are captured in terms of unified
technology-agnostic aggregate variables, instantaneous power and rate of change
of instantaneous reactive power. Sufficient dissipativity conditions in terms
of rate of change of energy conversion in components themselves and bounds on
their rate of change of interactions are derived in support of achieving the
maximum system loadability. These physically intuitive conditions are then used
to derive methods to increase loadability using high switching frequency
reactive power sources. Numerical simulations confirm the theoretical
calculations, and shows dynamic load-side reactive power support increases
stable dynamic loadability regions.
