Design Principles of Wind Turbine Inertia Emulators for Autonomous Systems

Abstract The problem of frequency control and stability has become more prominent with the increasing use of converter-connected generators in many countries around the world. Especially in small autonomous systems, the replacement of conventional synchronous generation by variable-speed wind turbines may lead to large deviations of system frequency after severe transients and possibly even customer disconnection. For wind generators, a control scheme that is already being implemented, in order to mitigate this problem, is the addition of an inertia emulator. This paper proposes a design principle for wind turbine inertia emulators based on the characteristics of the autonomous system to which the wind turbines are connected.