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Mathematical model for a combined cycle plant and its implementation in an analogue power system simulator

Large-scale blackouts due to a cascade trip of gas turbine generators have been reported. From the viewpoint of improving power system reliability, the behaviors of gas turbine generating plants and combined cycle plants during the occurrence of a large disturbance in the power system should be clarified. In this paper, a block diagram representing dynamic behaviors of a combined cycle plant, derived from process physical relationships, is described and a modeling method of a multi-shaft type combined cycle plant is proposed. Simulation methods of the combined cycle plant in an analog power system simulator are shown.