Title: Online implementation of wavelet-based identification and dynamic matrix control in a heat exchanger unit
Authors: Hare Krishna Mohanta, Ram Krishna Gupta
Addresses: Chemical Engineering Group, B.I.T.S., Pilani 333 031, Rajasthan, India. ' ICFAI Institute of Science and Technology, No. 63/3, Gottigeri, Off. Bannerghatta Road, Bengaluru, Karnataka 560083, India
Abstract: This paper presents an online implementation of wavelet-based least-square identification (WLSI) and wavelet-based dynamic matrix control (WDMC) in a plate-type heat exchanger unit. Wavelet domain |blocking| and |condensing| (B&C) techniques are used to reduce the computation time for optimisation of dynamic matrix control (DMC) performance index. Algorithms for WLSI and WDMC are developed and implemented in the online identification and control of temperature in a heat exchanger unit. The results are compared with conventional PID and DMC controllers. It is observed that the WDMC is better and robust than the other controllers.
Keywords: dynamic matrix control; WDMC; wavelet-based DMC; WLSI; wavelet-based least-squares identification; heat exchanger unit; PID control; blocking; condensing; temperature control.
International Journal of Automation and Control, 2010 Vol.4 No.3, pp.317 - 342
Received: 02 Dec 2008
Accepted: 19 May 2009
Published online: 02 Jun 2010 *