Distributed Adaptive Fault-Tolerant Secondary Control of Islanded Microgrids Under Actuator Faults and IQCs-Uncertainties

The increasing possibility of faults and attacks is one of the main cybersecurity problems in the distributed secondary control of microgrids (MGs). To alleviate the impacts of actuator faults and multiple uncertainties on the secondary control of islanded MGs, a novel distributed adaptive fault-tolerant control method is proposed. Firstly, compared with the existing research on the bounded uncertainties, this paper investigates a more general form of uncertainties that are restricted to integral quadratic constraints (IQCs), considering both the multiplicative fault term and the biased fault term of actuator faults. Then, based on the sparse communication network, the controllers are designed for the voltage/frequency restoration along with the accurate active power sharing, in the presence of actuator faults and IQCs-uncertainties. The stability of the proposed controllers is proved by the Lyapunov approach. Finally, simulation cases are provided to illustrate the effectiveness of the proposed control approach.