直流微电网在事件触发非周期间歇控制下的镇定

Stabilization of DC microgrid under event-triggered aperiodic intermittent control

中文关键词  恒功率负载  直流微电网  间歇控制  事件触发控制  稳定性

英文关键词  constant power loads  direct-current (DC) microgrid  intermittent control  event-triggered control  stability

中文摘要

      本文研究系统的负荷功率超过系统本身稳定区域, 从而导致系统状态发散下的直流微电网的事件触发间歇控制问题. 由于直流微电网负荷功率具有随机性, 大负荷功率的负阻抗特性可能会造成系统的不稳定. 本文通过引入储能系统, 控制储能系统的注入电流来稳定直流微电网. 考虑到储能受实际物理条件的限制, 本文对控制器的输出能量和控制电流的大小进行了约束. 其次, 为了使控制器在控制中更合理的利用通信带宽, 节省通信资源, 设计了一个基于状态控制宽度的事件触发间歇控制器. 并借助Lyapunov函数证明了所提控制的稳定性, Zeno行为也在稳定性分析中进行了排除. 最后, 通过一个实例验证所提控制方案的有效性.

英文摘要

      This paper investigates the problem of event-triggered intermittent control in DC (direct-current) microgrids,where the load power exceeds the stability region and causes system state dispersion. Due to the stochastic nature of DC microgrid load power, the negative impedance characteristics of high-load power may lead to system instability. In this paper, the stability of the DC microgrid is enhanced through the implementation of an energy storage system and control over its injection current. Considering that the energy storage is limited by the actual physical conditions, the output energy of the controller and the magnitude of the control current are constrained in this paper. To optimize communication bandwidth utilization and conserve control resources, an event-triggered intermittent controller based on state control width is designed. The stability of the proposed control is established through Lyapunov function method, and the Zeno behavior is also excluded in the stability analysis. Finally, a practical microgrid example is presented to demonstrate the efficacy of the proposed control scheme.