Nonblocking is an important issue in supervisory control of discrete event systems. In this paper, we investigate nonblocking control for networked discrete event systems. In networked discrete event systems, there are two types of supervisory controls: nondeterministic control and deterministic control. Following the deterministic control, we investigate the nonblocking control problem in a decentralized control framework where communication among the plant and the local supervisors are subject to nondeterministic but bounded delays. We introduce delay co-observability to capture the nondeterminism caused by observation delays. With delay co-observability, we derive a necessary and sufficient condition for the existence of solutions of the nonblocking control problem. When the condition is satisfied, we propose to use state-estimate-based predictive local networked supervisors to control the plant. To illustrate the applications of the results, we consider a black start problem in micro grids.

中文翻译：

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通信延迟下网络离散事件系统的非阻塞和确定性分散控制

非阻塞是离散事件系统监督控制中的一个重要问题。在本文中，我们研究了网络离散事件系统的非阻塞控制。在网络离散事件系统中，有两种类型的监督控制：非确定性控制和确定性控制。在确定性控制之后，我们研究了分散控制框架中的非阻塞控制问题，其中工厂和本地监管者之间的通信受到不确定性但有界延迟的影响。我们引入了延迟协同可观察性来捕捉由观察延迟引起的不确定性。通过延迟可观测性，我们推导出非阻塞控制问题解存在的充分必要条件。当条件满足时，我们建议使用基于状态估计的预测性本地联网监管者来控制工厂。为了说明结果的应用，我们考虑微电网中的黑启动问题。