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Open-loop unstable systems with time delay are difficult to control using routine control methods. To solve this problem, an improved internal model control scheme, which adds a PD controller to traditional IMC structure, is proposed. Set point tracking performance and robustness can be designed independently. The tuning formula of PD controller is confirmed by a new performance index function. Fuzzy...
A well known obstruction to design based on supervisory control theory (SCT) is exponential state space explosion. Heuristics derived from system interconnection relationships may, however, prove effective in mitigating design complexity. By use of a new modeling tool, the control-flow net, we formalize several intuitive systemic properties and identify when they are applicable. On this basis it is...
A flexible modular and hierarchical structure is presented to reduce computational effort in designing optimal nonblocking supervisors for discrete-event systems (DES). The structure organizes the system into modular subsystems that embody internal interacting dependencies. Verification and coordination among modular subsystems are achieved through their model abstractions. Sufficient conditions are...
This paper presents structural criteria for qualitative reasoning and reduction in discrete event systems. On this basis, the computation of a control synthesis may be considerably simplified. Interconnections among plant components and specifications are captured by a new modeling tool, control-flow net. Special net structures that guarantee nonblocking control are identified
A synthetic PI fuzzy sliding mode load frequency control method for multiarea interconnected power systems is proposed in this paper. The method has the advantages of PI and sliding mode control, using sliding mode surface with integral model makes the system can reach on switching surface from any initial state. After reaching on switching surface, system is controlled by PI controller based on new...
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