Privacy protection-based resilient secondary control for DC microgrids under DoS attacks

In this paper, we investigate the privacy protection-based resilient secondary control problem for an isolated DC microgrid (MG) under denial-of-service (DoS) attacks. To solve the problem, a resilient privacy protection control method is proposed by introducing random noises and the state decomposition strategy. Specifically, the initial secondary control signal of each distributed generator (DG) includes two parts: one is utilized for neighbor communication and compensating for the voltage deviation caused by the droop control, while the other influences the evolution of the first part and remains undetected to the neighbors. Besides, to ensure that the true value of the transmitted current remains obscured, random noises are injected in the first part. Based on the developed privacy protection mechanism, a distributed resilient controller is designed to guarantee the deviations in current and voltage are effectively regulated within the permissible range under DoS attacks, while simultaneously safeguarding the privacy datas. Ultimately, the efficiency of our proposed method is proved through real-time experiments conducted in OPAL-RT 4510. •A secondary controller ensures resilient privacy protection for the DC MG.•A resilient control method resists DoS attacks, advancing existing privacy-preserving strategies.•The effectiveness of the proposed method is validated through real-time experiments conducted in OPAL-RT.