Patent ID: 8560205
Filing Date: 2013-10-15
Classification: F02C,F05D,F23R

Abstract:
1. A gas turbine control device, comprising: a frequency analyzing unit for performing a frequency analysis of combustion oscillation in a combustor of a gas turbine and for splitting a result of this frequency analysis into a plurality of respective frequency bands; a fuel characteristic estimating unit having at least three thresholds that are preset for categorizing a fuel characteristic into at least four categories, said fuel characteristic estimating unit configured to compare said at least three thresholds with a ratio between an output of the gas turbine and a fuel flow rate of the fuel and to determine which one out of said at least four categories, the fuel characteristic of the fuel corresponds to; an inputting unit to which a process value of the gas turbine other than a fuel composition and a heat capacity of the fuel is inputted; a state grasping unit for checking a current state of operation of the gas turbine by using the result of the frequency analysis split into the respective frequency bands from the frequency analyzing unit, the process value of the gas turbine from the inputting unit, and the category of the fuel characteristic determined by the fuel characteristic estimating unit; a countermeasure determining unit for determining an increase or decrease in a flow rate of at least one of the fuel flow rate and an air flow rate to the combustor on the basis of the current state of operation of the gas turbine checked by the state grasping unit; and an outputting unit for outputting an operation amount corresponding to a countermeasure determined by the countermeasure determining unit, in which a history indicating a relation between the category of the fuel characteristic and combustion oscillation of the combustor is recorded, and that a relation of the current state of operation of the gas turbine corresponding to the category of the fuel characteristic is determined based on the history, wherein said at least four categories are classified into a small category, a slightly small category, a slightly large category and a large category in accordance with the preset thresholds.