SUMMARYThis paper presents an application of H and -synthesis controller design methods to a coal-"red power generation unit and compares the closed-loop performance and robustness of H and -synthesis control laws with those of an H control law. The model which relates "ring rate and turbine valve position inputs to throttle pressure and megawatt outputs presented by Ollat and Smoak in an earlier work is modi"ed to match the test data from a Tennessee Valley Authority (TVA) power generation unit. All three controller synthesis procedures are applied to a two-input two-output plant model which has time delay, di!erential part, colored noise output disturbance, and sensor noise disturbance. Application of the procedures to the model shows that when the shape of the closed loop control signals of all three designs is closely matched, in the low-frequency range the -synthesis and H control laws have robustness much better than that of H control law, while providing adequate robustness in the high-frequency range. H control law gives the best performance, and H } the worst of the three designs, exhibiting the largest overshoot. The balancing procedure permits signi"cant reduction of the order of the controllers without degradation in performance and robustness. The comparative evaluation of three designs shows that in power plant control problem H and -synthesis designs provide much more consistent and convenient performance/robustness trade-o! than H design.
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