This article is a brief exposure of the process approach to a newly emerging area called "discrete event systems" in control theory and summarizes some of the recent developments in this area. Discrete event systems is an area of research that is developing within the interstices of computer, control and communication sciences. The basic direction of research addresses issues in the analysis an...

In this paper, a robust local controller has been designed to balance the power for distributed energy resources (DERs) in an islanded microgrid. Three different DER types are considered in this study; photovoltaic systems, battery energy storage systems, and synchronous generators. Since DER dynamics are nonlinear and uncertain, which may destabilize the power system or decrease the performanc...

The current technological and organizational configuration of the Mission Control Center (MCC) at Johnson Space Center (JSC) has been a mainstay of NASA’s approach to human space flight. MCC represents a unique combination of traditional command and control approaches to supervisory control, and a set of highly experienced, team-based coordinated experts conducting distributed supervisory coord...

In the domain of Automated Manufacturing Systems (AMS), Supervisory Control Theory (SCT) is a general modelbased framework, which contributes to the automated development of control systems. Although, SCT delivers important theoretical insights to deal with controllers design, its use in the industry is still weak, because of the discrepancy among its abstract controllers and their physical imp...

due to the changes which may occur in their parameters, systems are usually demonstrated by some subsystems for different conditions. this paper employs modified petri nets (mpn) to model theses subsystems and makes it simple to analyze them. in this method, first, the continuous transfer function is converted to a discrete transfer function and then, by mpn, system is modeled and analyzed. all...

This paper presents the development and implementation of a Real-Time Expert System (RTES) for the supervision and control of a wastewater treatment pilot plant (WWTPP) with biological removal of organic matter and nutrients. The hardware architecture contains different supervision levels, including two autonomous process computers (plant control and analysers control) and a PLC, being the ES t...

The object-oriented paradigm has been used extensively both in CASE tools for modeling and design of distributed real-time systems as well as in software tools for developing supervisory control systems. Supervisory tools are very useful in the context of real-time industrial automation systems. Recent researches prove that the use of object-orientation paradigm in the development of these syst...

A formal approach to distributed supervisory control synthesis for automated manufacturing systems is presented in this paper. The discrete manufacturing system (plant) is modeled with automata in a modular way and local control specifications are defined for each local subsystem by means of logical equations in order to construct local supervisors. To establish global control, global specifica...

Decomposition and localization of a supervisor both are reduction methods in distributed supervisory control of discrete-event systems.Decomposition is employed to reduce the number of events and localization is used to reduce the number of states of local controllers.In decomposition of a supervisor both observation and control scopes are restricted, whereas in localization only control author...