A Decentralized Resilient Control Scheme for DC Microgrids Against Faults on Sensor and Actuator
Keting Wan, Jinghan Zhao, Yongpan Chen, Miao Yu
Abstract
Sensor faults and actuator faults inevitably exist in DC microgrids due to device aging, environmental changes, or cyber-attacks, which seriously degrades control performance. The existing resilient control methods for DC microgrids still bear some deficiencies, such as poor performance, limited applicability, and heavy tasks of calculation or communication. To overcome these problems and to realize the resilient control for DC microgrids with both sensor faults and actuator faults, this article has proposed a decentralized control scheme to guarantee the control resilience of bus voltage regulation and current sharing simultaneously. The proposed scheme contains a residual-based fault detection logic to locate the faulty sensor, an adaptive fault estimation observer to estimate the system state and faults simultaneously, and a finite-time fault-tolerant control law to guarantee resilience to faults. The stability proof based on Lyapunov analysis is given to validate the effectiveness of the proposed scheme. Finally, a DC microgrid model is built in the hardware-in-the-loop testbed to validate the effectiveness and superiority of the proposed decentralized resilient control scheme.