Reliable Hybrid Control Scheme for Distributed DC Microgrid Based on Dual Kalman Filter Under Cyberattacks and Voltage Sensor Faults

In this article, a reliable hybrid control scheme for distributed dc microgrid (DCMG) is proposed to maintain both the voltage stabilization and power management in the presence of multiple cyberattacks and voltage sensor fault. A dual Kalman filter, which separately estimates the secondary control output and dc-link voltage values, is implemented to effectively identify the system abnormalities. As soon as the abnormalities such as cyberattacks or sensor failures are detected, the proposed hybrid control scheme instantly changes the operation of the power agents to the appropriate control mode to maintain the stability of DCMG system. The proposed hybrid control scheme requires only unidirectional communication links for distributed DCMG, which contributes to achieve the consensus in secondary control output with optimal communicational cost. In addition, an adaptive droop curve is also considered in the primary control to minimize the electricity price. The stability of the proposed hybrid control scheme is mathematically analyzed. The reliability of the proposed strategy is verified through several simulations and experimental results.