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Implementing supervisory control for chemical batch processes

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2 Author(s)
K. Akesson ; Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden ; M. Fabian

In chemical batch control applications the specification of how to produce a batch is called a recipe. When several recipes execute concurrently within a plant there is a possibility for circular wait between recipes utilizing shared resources. A circular wait might lead to the loss of an entire batch; this is costly and should therefore be avoided. This work describes the implementation of a discrete-event supervisor aimed to prevent a batch processing system from running into circular waits by restricting resource allocations. The supervisor interacts with SattLine, a commercial control system for flexible production systems, which in turn executes the batch recipes. The supervisor consists of two parts: (1) generation of a circular wait free specification, and (2) an execution part that restricts the behavior of the control system such that the specification is fulfilled

Published in:

Control Applications, 1999. Proceedings of the 1999 IEEE International Conference on  (Volume:2 )

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