  In this paper, a model reference control based inertia emulation strategy is
proposed. Desired inertia can be precisely emulated through this control
strategy so that guaranteed performance is ensured. A typical frequency
response model with parametrical inertia is set to be the reference model. A
measurement at a specific location delivers the information of disturbance
acting on the diesel-wind system to the reference model. The objective is for
the speed of the diesel-wind system to track the reference model. Since active
power variation is dominantly governed by mechanical dynamics and modes, only
mechanical dynamics and states, i.e., a swing-engine-governor system plus a
reduced-order wind turbine generator, are involved in the feedback control
design. The controller is implemented in a three-phase diesel-wind system feed
microgrid. The results show exact synthetic inertia is emulated, leading to
guaranteed performance and safety bounds.
