A non-minimal state variable feedback approach to multivariable control of glasshouse climate.

Lees, M. J. and Young, P. C. and Chotai, A. and Tych, W. (1995) A non-minimal state variable feedback approach to multivariable control of glasshouse climate. Transactions of the Institute of Measurement and Control, 17 (4). pp. 200-211. ISSN 1477-0369

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Abstract

The paper discusses the multivariable modelling and control of a glasshouse micro-climate. A linear reduced-order control model is obtained from a nonlinear simulation model using novel data-based model reduction and linearisation techniques. This control model is then used to design two multivariable non-minimal state variable feedback (SVF) control systems. The first utilises an LQoptimal Proportional-Integral-Plus (PIP) design method incorporating multi-objective optimisation of the weighting matrices, achieving partial dynamic decoupling; while the second uses an algebraic approach to combined pole-assignment and full dynamic decoupling. These controllers are evaluated, to ensure robustness, using the nonlinear simulation model, prior to implementation and evaluation on the real glasshouse during the 1993-94 winter growing season. Control results are excellent with very tight control to the desired setpoints in all three climate variables. For example, air temperature is controlled to within 0.5°C of the setpoint for 85% of the validation period, and is shown to be very robust to model uncertainty and extreme weather conditions.

Item Type:
Journal Article
Journal or Publication Title:
Transactions of the Institute of Measurement and Control
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
?? NON-MINIMAL • STATE VARIABLE • FEEDBACK • MULTIVARIABLE CONTROL • GLASSHOUSE CLIMATEINSTRUMENTATIONGE ENVIRONMENTAL SCIENCES ??
ID Code:
22294
Deposited By:
Deposited On:
06 Feb 2009 13:12
Refereed?:
No
Published?:
Published
Last Modified:
19 Sep 2023 00:17