A two-level model following control system and its application to the power control of a steam-cooled fast reactor
✍ Scribed by G. Preusche
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 814 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0005-1098
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✦ Synopsis
Using state variable feedback control within a special structure derived from the known structure of "conditional feedback", it is possible to combine the advantages of both conventional and state variable feedback controllers.
Snmmary--In using control with state vector feedback in process control certain difficulties arise. However they can be avoided for the most part ff the controller with state vector feedback is used within the special two-level control structure proposed in this paper. The philosophy of the structure is to consider all known properties--structure, parameters and measurable disturbances---of the plant within an open-loop, feed-forward, upper level control scheme containing a model of the plant to be controlled and a controller which feeds back the model's state vector. Then a feedback servo system at the lower level has only to compensate for small deviations between the plant's model and the real plant caused by unknown or unregarded properties of the plant. A final example shows the application of the structure to the power control of a steam cooled fast reactor simulated on a hybrial computer. algorithms together with the control system recommended in this paper are applied. This system with two degrees of freedom can be derived from the known structure of "conditional feedback" as defined by HOROWITZ [1]. It attempts to establish consistently the idea that all known properties of the plant--structure, parameters and measurable disturbances---can be accounted for in an openloop feed-forward control scheme. Then a following feedback control loop must only compensate for the effects of unknown properties on the controlled variables.