Adaptive Voltage Control of Grid-Forming Inverters

This paper proposes the use of a discrete-time adaptive voltage controller for the inner loop of grid-forming inverters, which is a state-feedback model reference adaptive controller (MRAC) employing a gradient adaptive algorithm. The proposed controller is suitable for grid-connected and islanded microgrid applications. The grid impedance at the point of common coupling is considered in the design of the adaptive voltage controller in a way that its uncertainty is simply compensated by the adaptation of the state-feedback gains. Simulation results are presented to validate the proposal.