  Ensuring protective device coordination is critical to maintain the
resilience and improve the reliability of large microgrids. Inverter-interfaced
generation, however, poses significant challenges when designing protection
systems. Traditional time-overcurrent protective devices are unsuitable on
account of the lack of fault current. Present industry practice is to force all
inverters to shut down during faults, which prevents large microgrids from
operating in a resilient and reliable manner. Dynamic state estimation (DSE)
has been proposed for line protection, and more recently for the protection of
load buses or downstream radial portions of microgrids. However, only passive
loads with series resistive-inductive loads have been tested with DSE, even
though the behavior of dynamic loads -- such as induction motors or power
electronics -- may differ significantly during faults. This paper considers the
case of applying DSE to protecting a load bus serving a three-phase induction
motor.
