Gas turbine control device, gas turbine control method, and gas turbine control program

A gas turbine control method for controlling a gas turbine including a combustor capable of co-firing a first fuel and a second fuel having a lower calorific value per unit volume than the first fuel, the gas turbine control method comprising:

• a step of acquiring a load reduction request for the gas turbine;
• a step of acquiring a co-firing ratio of the combustor at a time of acquisition of the load reduction request;
• a step of setting a flow rate target value of the first fuel at a time of acquisition of the load reduction request;
• and
• a step of controlling a flow rate of the first fuel to the flow rate target value in a case where the load reduction request is acquired,
• wherein in the step of setting the flow rate target value, a basic flow rate target value of the first fuel for realizing a load corresponding to the load reduction request by exclusive combustion of the first fuel is set by correcting the basic flow rate target value based on the co-firing ratio.

A gas turbine control program for controlling a gas turbine including a combustor capable of co-firing a first fuel and a second fuel having a lower calorific value per unit volume than the first fuel, the program causing a computer device to execute:

• a step of acquiring a load reduction request for the gas turbine;
• a step of acquiring a co-firing ratio of the combustor at a time of acquisition of the load reduction request;
• a step of setting a flow rate target value of the first fuel at a time of acquisition of the load reduction request;
• and
• a step of controlling a flow rate of the first fuel to the flow rate target value in a case where the load reduction request is acquired,
• wherein in the step of setting the flow rate target value, a basic flow rate target value of the first fuel for realizing a load corresponding to the load reduction request by exclusive combustion of the first fuel is set by correcting the basic flow rate target value based on the co-firing ratio.