Distributed Optimal Power Dispatch for Islanded DC Microgrids Based on Predefined-Time Control

To effectively manage isolated DC microgrids (MGs), a control system with adaptable response time for handling the dynamic nature of renewables and changing load demands is essential. This paper introduces a novel distributed predefined time (PDT) control, which is developed for optimizing the power dispatch in islanded DC MGs. The proposed strategy incorporates a distributed PDT cost optimizer, aimed at maintaining the MGs' economical operation through synchronizing the incremental costs (ICs) of all distributed generators (DGs) concerning their capacity constraints within a prescribed convergence time. Furthermore, a PDT voltage regulator is presented to ensure MG's average voltage stability, balancing the power supply and demand within a predetermined timeframe. A notable advantage of the developed control system is its capability for modulating the convergence time utilizing a predefined parameter, irrespective of the initial states. A thorough stability analysis is introduced, confirming the controller's stability within a predefined time. Extensive simulations and experimental case studies have been presented, demonstrating the controller's effectiveness in a variety of scenarios.