Distributed Predefined-time Optimization and Control for Multi-bus DC Microgrid

As an extension of single-bus DC microgrid, multi-bus DC microgrid has become a popular research topic due to its better availability and reliability and more reconfiguration options. The fundamental and challenging control objectives for multi-bus DC microgrids are bus voltage regulation and current sharing with transmission loss minimization. In this paper, a multi-objective optimization problem with penalty factors is formulated, and the global optimal solution is presented explicitly. A distributed predefined-time optimization and control approach is designed by employing a time-dependent function and a distributed predefined-time observer. Under the proposed approach, bus voltage, output current, and power flow converge within a predefined settling time. The performance of the proposed approach is evaluated by simulations and hardware-in-the-loop experiments in terms of trade-off ability, impact of parameter changes, robustness to load variation and grid reconfiguration, plug-and-play functionality, and comparison case.