Resilient Voltage Control for DC Microgrids Under Integrity Cyberattacks on Voltage Sensors

This article develops a novel resilient voltage stabilization framework for direct current (DC) microgrids comprising distributed generation (DG) units. The framework ensures safe voltage levels within the microgrid despite integrity cyberattacks targeting voltage sensors. Central to the proposed approach is a decentralized, resilient unknown input observer (UIO), which integrates with the existing voltage controllers of DG units. This observer is designed to accurately estimate the states of each DG unit, irrespective of unknown and varying load conditions, line parameters, or compromised voltage sensor measurements. The framework guarantees the uniform ultimate boundedness of the closed-loop dynamical system of the microgrid, even under adversarial sensor attacks that compromise the integrity of voltage measurements. Simulation case studies conducted on a DC microgrid consisting of six power-electronics-interfaced DG units validate the effectiveness of the proposed method.