GAS-TURBINE CONTROL DEVICE, GAS TURBINE, AND GAS-TURBINE CONTROL METHOD

摘要

A gas turbine drives a power generator by rotating a turbine using combustion gas generated in a combustor as a result of supplying the combustor with fuel and compressed air from a compressor, which is provided with an inlet guide vane at a front stage. An operation control device of the gas turbine enables an IGV priority open flag when the inlet guide vane is not fully open and when the system frequency is lower than or equal to a predetermined threshold value a or there is a request for increasing the output of the gas turbine. When the IGV priority open flag is enabled, the operation control device sets the degree of opening of the inlet guide vane to be larger than before. Accordingly, the output can be increased without having to increase the turbine inlet temperature, regardless of the operational state of the gas turbine.

主权项

1. A gas-turbine control device that drives a power generator by rotating a turbine using combustion gas generated in a combustor as a result of supplying the combustor with fuel and compressed air from a compressor, which is provided with an inlet guide vane at a front stage, the gas-turbine control device comprising:
an IGV-control-flag generating unit that enables an IGV priority open flag when an output of the gas turbine is to be increased in a state where the gas turbine operates with a partial load; and an inlet-guide-vane degree-of-opening setting unit that sets a degree of opening of the inlet guide vane to be larger than before if the IGV priority open flag is enabled so that the output of the turbine increases due to intake-air flow in the compressor increasing to a level higher than or equal to a heat drop caused by a decrease in turbine inlet temperature.