Abstract
A control system design study for a two-shaft gas turbine with a variable geometry turbine is described. A two-shaft configuration has the disadvantage of a lower transient response compared with a single shaft configuration. The overcoming of this disadvantage has a significant meaning for its practical usage. First, the lower order linear model formulated by the author is evaluated using a simulator which was developed considering conservations of mass, momentum and energy. Secondly, considering small perturbations of state variables, the optimal regulator problem is formulated. Finally, asuboptimalfeedback control law is proposed so as to make possible treatment of cases of large changes of state variables, in which it is necessary to consider some constraints. Then improvements in stability and response during any transient state due to this control law are confirmed by simulations. As for implementation of the law, storage of only three gain matrices is required.
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