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1 International Journal of Applied Mathematics and Computer Science

1 2000

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Dynamic Algorithm for Linear Quadratic Gaussian Predictive Control

Ordys A. W., Hangstrup M. E., Grimble M. J.

International Journal of Applied Mathematics and Computer Science

2000

Vol. 10, no 2

227-244

In this paper, the optimal control law is derived for a multi-variable state-space Linear Quadratic Gaussian Predictive Controller (LQGPC). A dynamic performance index is utilized resulting in an optimal steady-state controller. Knowledge of future reference values is incorporated into the controller design and the solution is derived using the method of Lagrange multipliers. It is shown how the well-known GPC controller can be obtained as a special case of the LQGPC controller design. The important advantage of using the LQGPC framework for designing predictive controllers is that, based on stabilizing properties of LQG control, it enables a systematic approach to selection of the design parameters to yield a stable closed-loop system. The system model considered in this paper can be further extended toalso include direct feed-through and knowledge about future external inputs.