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Virtual inertia controllers (VICs) for wind turbine generators (WTGs) havebeen recently developed to compensate for the reduction of inertia in powersystems. However, VICs can induce low-frequency torsional oscillations of thedrive train of WTGs. This paper addresses this issue and develops a newnonlinear VIC based on objective holographic feedbacks theory. This approachallows transforming the objectives that require improvement into a completelycontrollable system of Brunovsky's type. Simulation results under variousscenarios demonstrate that the proposed method outperforms existing VICs interms of suppression of WTG low-frequency drive-train torsional oscillations,enhancement of system frequency nadir as well as fast and smooth recovery ofWTG rotor speed to the original MPP before the disturbance. The proposed methodis also able to coordinate multiple WTGs.

Nonlinear Virtual Inertia Control of WTGs for Enhancing Primary Frequency Response and Suppressing Drive-Train Torsional Oscillations