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The capability to switch between grid-connected and islanded modes haspromoted adoption of microgrid technology for powering remote locations.Stabilizing frequency during the islanding event, however, is a challengingcontrol task, particularly under high penetration of converter-interfacedsources. In this paper, a numerical optimal control (NOC)-based controlsynthesis methodology is proposed for preparedness of microgrid islanding thatensure guaranteed performance. The key feature of the proposed paradigm is nearreal-time centralized scheduling for real-time decentralized executing. Fortractable computation, linearized models are used in the problem formulation.To accommodate the linearization errors, interval analysis is employed tocompute linearization-induced uncertainty as numerical intervals so that theNOC problem can be formulated into a robust mixed-integer linear program. Theproposed control is verified on the full nonlinear model in Simulink. Thesimulation results shown effectiveness of the proposed control paradigm and thenecessity of considering linearization-induced uncertainty.

Robust Trajectory-Constrained Frequency Control for Microgrids Considering Model Linearization Error