A Decentralized Fault-Tolerant Control for DC Microgrids Against Disturbances and Actuator Faults

Distributed cooperative control methods are widely applied for DC microgrid (MG) due to their high accuracy, flexibility, and scalability, but their reliance on mutual communication makes them highly vulnerable to malicious network attacks and disturbances. To completely avoid the impact of cyber-attacks and to deal with the disturbances and actuator faults, this paper has proposed a decentralized fault-tolerant control (FTC) by using input-output feedback linearization and sliding mode control (SMC). Through the input-output feedback linearization, the original system model can be transformed into an equivalent linear system, and then the stability and robustness of the derived linear system can be ensured by using the conditioned super-twisting algorithm (STA), which is an improved robust SMC utilizing the anti-windup conditioning technique. Unlike the distributed cooperative methods, this approach has formed a local solution without the transmission of distributed signals through the communication network among distributed generation (DG) units. Besides, both bus voltage regulation and current sharing can be realized with the tolerance of disturbances and actuator faults. Rigorous proofs based on Lyapunov techniques have been given to show the effectiveness of the proposed method. Finally, the superiority of the proposed method is validated through the simulation in MATLAB/Simulink and experimental results of hardware-in-the-loop (HIL).