Abstract
A design and application of an optimal multivariable control concept for a boiler-turbine-system is described in this paper.Thereby the optimal control algorithm is computed by solving the algebraic matrix Riccati-equation for a 28th order process model with 6 input- and 8 output-variables. The command variables are fitted to the process in such a way that the controlled output variables will also reach the final steady state required without using integral control. Integral loops are only assigned additionally to avoid deviations from steady state caused by disturbances.The reconstruction of the non-measurable state-variables are done by complete Luenberger observer.The developed optimal control concept has been carried out with process computer directly at a thermal power plant unit. By using this concept the load changes can be three times or more greater than by using conventional control, which was applied before. This will be illustrated in the measuring curves.
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