Event-triggered Control Design of DC Microgrids Based on Dual-Channel Network Switching System under Denial-of-Service Attacks

For a class of networked DC microgrids control systems, a Dynamic Event-Triggerred Mechanism (DETM) based strategy is proposed to consider the DoS (Denial-of-Service) attacks in the case of induced delays and external disturbances. In this paper, a DETM is designed to compensate the instability of DC microgrids system by using limited bandwidth resources and primary redundant channels. Firstly, a DC microgrids model with primary redundant channels is developed, and a dwell time based switching strategy is introduced in the system in order to solve the problem of frequent switching between redundant channels, which leads to reduced switching efficiency. Then, we use the control strategy of DETM to save bandwidth resources, and further build a switching system with induced delay and external disturbance based on DoS attacks and DETM trigger sequence, construct a segmented Lyapunov-Krasovskii generalization, derive the conclusion that the system has exponential stability, and design a two-channel feedback gain and DETM parameters co-design method. Finally, the effectiveness of the target method for the design of networked DC microgrids systems is verified through simulation cases.