  Traditional emergency control schemes in power systems usually accompany with
power interruption yielding severely economic damages to customers. This paper
sketches the ideas of a viable alternative for traditional remedial controls
for power grids with high penetration of renewables, in which the renewables
are integrated with synchronverters to mimic the dynamics of conventional
generators. In this novel emergency control scheme, the power electronics
resources are exploited to control the inertia and damping of the imitated
generators in order to quickly compensate for the deviations caused by fault
and thereby bound the fault-on dynamics and stabilize the power system under
emergency situations. This emergency control not only saves investments and
operating costs for modern and future power systems, but also helps to offer
seamless electricity service to customers. Simple numerical simulation will be
used to illustrate the concept of this paper.
