Dynamic Event-Triggered Fixed-Time Distributed Secondary Control for DC Microgrids under Control Signal Uncertainty

DC microgrids face fundamental challenges in achieving simultaneous voltage regulation and current sharing. While conventional consensus-based secondary controllers overcome droop limitations, they suffer from slow asymptotic convergence and a high communication burden due to continuous, time-triggered data exchange. Finite-time consensus-based controllers, though faster, remain practically constrained by their dependence on initial conditions. This paper proposes a distributed fixed-time secondary control scheme, co-designed with a dynamic event-triggered communication mechanism. The proposed controller ensures exact bus-voltage restoration and accurate current sharing among Distributed Generation Units within a fixed settling time, independent of initial conditions, and is robust against control signal uncertainties. The dynamic event-triggered mechanism substantially reduces communication among Distributed Generation Units while maintaining overall microgrid stability. Rigorous Lyapunov-based analysis confirms the system’s fixed-time stability. In addition, the proposed event-triggering mechanism is shown to exclude Zeno behavior. Comprehensive MATLAB/Simulink simulations validate the proposed controller’s effectiveness, robustness to uncertainties, and superior performance across diverse operational scenarios.