基于周期事件触发的直流微电网分布式功率分配与电压调节方法

To ensure the secure operation of DC microgrids, it is necessary to utilize distributed control methods that achieve reasonable load power sharing and maintain bus voltage stability. Traditional distributed control design and analysis are usually based on continuous-time system models. However, in modern control systems, most control methods, especially system-level ones, are implemented by digital controllers and digital communications. To avoid potential instability when implementing continuous-time control strategies in discrete digital control systems, this study proposes a distributed discrete-time (DT) control method based on a DT DC microgrid model, which achieves proportional load power sharing and weighted geometric mean voltage regulation. Furthermore, to address potential network congestion issues caused by information exchange between distributed controllers, this study introduces a periodic event-triggered (PET) mechanism, which reduces the communication resource demand on the communication network while maintaining control performance. Since the triggering condition is only evaluated at DT instants, the Zeno phenomenon is inherently avoided. Moreover, using Lyapunov stability analysis and LaSalle's invariance principle, this study theoretically proves that the closed-loop system converges to the equilibrium point asymptotically. Finally, simulation tests of the proposed distributed method are conducted based on Simscape Electrical, demonstrating its effectiveness and robustness under imperfect communication networks.