An internal model approach to frequency regulation in inverter-based microgrids with time-varying voltages

This paper studies the problem of frequency regulation in inverter-based microgrids with time-varying voltages, described by a third-order model. Building upon our previous result on optimal frequency regulation in an ordinary power grid [1], we propose the design of internal-model-based controllers and analyze it within an incremental passivity framework. We believe that this framework is general enough to allow for more complex control scenarios in future extensions.