Application of Optimal Preview Control to Power Plant Cooling Systems

[+] Author and Article Information
D. R. Gunewardana

Western Electric, Princeton, N. J. 08540

M. Tomizuka, D. M. Auslander

Department of Mechanical Engineering, University of California, Berkeley, Calif. 94720

J. Dyn. Sys., Meas., Control 101(2), 162-171 (Jun 01, 1979) (10 pages) doi:10.1115/1.3426415 History: Received August 14, 1978; Online July 13, 2010


This paper deals with the application of dynamic control to cooling systems of power plants. The operation of heat dispersal systems with control can result in a saving of power and cooling water. The performance of all cooling systems depends, mainly, upon the ambient conditions and the heat load to be dissipated. Hence, a control scheme that makes use of information obtained by previewing the weather and load conditions, i.e., preview control, is ideally suited for this problem. An iterative procedure is presented for determining the optimal preview control policy for a dynamical system whose dynamics vary depending upon the mode of operation that the controller selects. The algorithm is applied to two types of cooling systems: one consisting of a spray pond and a natural draft wet cooling tower, and the other consisting of a spray pond and a dry cooling tower. The preview control scheme is shown to be a substantial improvement over the uncontrolled case.

Copyright © 1979 by ASME
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