Feedback Control by Stephen J. Dodds

Author:Stephen J. Dodds
Language: eng
Format: epub
Publisher: Springer London, London

Figure 7.5 shows a multivariable controller applied to this plant.

Fig. 7.5Block diagram representation of a general multivariable control system

The purpose of a multivariable controller is twofold. 1.In common with other controllers, it has to achieve the required closed-loop dynamic behaviour and robustness against plant parameter uncertainties and external disturbances.

2.The multivariable controller must, at least, ensure that any combination of step reference input vector components is responded to with acceptably small or zero steady-state errors due to DC interaction, i.e., steady-state errors in y i due to constant values of y j , . Usually, in addition, dynamic interaction has to be minimised, meaning that a change in y ri (t) results in y i (t) responding as desired with minimal transient disturbance of y j (t), , .

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