期刊
ISA TRANSACTIONS
卷 51, 期 6, 页码 778-785出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.isatra.2012.06.008
关键词
Process control; Neural network; Superheated steam temperature; Stochastic control
资金
- National Basic Research Program of China under Grant 973 Program [2011CB710706]
- China National Science Foundation [60974029]
In this paper, an improved cascade control methodology for superheated processes is developed, in which the primary PID controller is implemented by neural networks trained by minimizing error entropy criterion. The entropy of the tracking error can be estimated recursively by utilizing receding horizon window technique. The measurable disturbances in superheated processes are input to the neuro-PID controller besides the sequences of tracking error in outer loop control system, hence, feedback control is combined with feedforward control in the proposed neuro-PID controller. The convergent condition of the neural networks is analyzed. The implementation procedures of the proposed cascade control approach are summarized. Compared with the neuro-PID controller using minimizing squared error criterion, the proposed neuro-PID controller using minimizing error entropy criterion may decrease fluctuations of the superheated steam temperature. A simulation example shows the advantages of the proposed method. (c) 2012 ISA. Published by Elsevier Ltd. All rights reserved.
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