Idenitification, estimation and control of glasshouse systems

Abstract The paper outlines the True Digital Control (TDC) design philosophy and describes the major aspects of the Proportional-Integral-Plus (PIP) design procedure for systems described by transfer functions in either the backward shift (z −1 ) or the delta (δ) operator. This procedure has been implemented in the TDC computer aided control system design package, and the use of this package is illustrated by an example concerned with the LQ optimal PIP control of an Nutrient Film Technique system used in glasshouse horticulture.

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