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PLANT-WIDE MODEL PREDICTIVE CONTROL OF A THERMAL POWER PLANT

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Prasad, G, Irwin, GW, Swidenbank, E and Hogg, BW (1999) PLANT-WIDE MODEL PREDICTIVE CONTROL OF A THERMAL POWER PLANT. In: IASTED International Conference, Control and Applications (CA'99), 25-30 July, Banff, Canada, Banff, Canada. IASTED International Conference, Control and Applications (CA'99). 6 pp. [Conference contribution]

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Abstract

This paper reports a non-linear model predictive control (NPMPC) strategy for improved plant-wide control of a thermal power plant. The strategy makes use of successive linearisation and extended Kalman filtering (EKF) to obtain a linear state-space model. The linear model and a quadratic programming routine are then used to design a constrained long-range predictive control routine. A special feature of the control strategy is the selection of a specific set of model parameters for on-line closed-loop estimation to account for time-varying system characteristics resulting from major system disturbances and ageing. Acting as stochastic disturbance states, these parameters provide sufficient degrees-of-freedom to obtain unbiased estimates of controlled outputs and system states. A plant model with 14 non-linear ODEs, simulating the dominant characteristics of a 200 MW oil-fired power plant at Ballylumford, N. Ireland, has been used to test the NPMPC algorithm. The control strategy gives impressive simulation results during large system disturbances and extremely high rate of load changes right across the operating range. The results compare favourably to those obtained with non-linear state-space GPC method designed under similar conditions.

Item Type:Conference contribution (Paper)
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Computing and Intelligent Systems
Research Institutes and Groups:Computer Science Research Institute
Computer Science Research Institute > Intelligent Systems Research Centre
ID Code:18483
Deposited By:Professor Girijesh Prasad
Deposited On:16 May 2011 11:55
Last Modified:20 May 2011 15:21

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