Method and control system for controlling compressor output of a gas turbine engine

A programmable logic controller for a two-shaft gas turbine engine having a plurality of variable guide vanes, a combustion chamber, a gas producer shaft, a turbine, and a power transfer device, the programmable logic controller comprising:

• at least one processor;
• and
• a non-transitory memory in communication with the at least one processor and storing software that, when executed by the at least one processor causes the programmable logic controller to
• determine a gas producer shaft speed and a temperature of the turbine,
• in response to the gas producer shaft speed being below a gas producer shaft speed threshold and the temperature of the turbine being within a predetermined range of a turbine temperature threshold, increase an amount of fuel to be combusted within the combustion chamber and by applying additional power to the gas producer shaft with the power transfer device;
• and
• in response to the gas producer shaft speed being within a predetermined range of the gas producer shaft speed threshold and the turbine temperature being below the turbine temperature threshold, increase the amount of fuel to be combusted within the combustion chamber and by removing power from the gas producer shaft with the power transfer device.

A programmable logic controller for a two-shaft gas turbine engine having a combustion chamber, a gas producer shaft, a turbine, and a power transfer device, the programmable logic controller comprising:

• at least one processor;
• and
• a non-transitory memory in communication with the at least one processor and storing software that, when executed by the at least one processor causes the programmable logic controller to
• determine a gas producer shaft speed and a temperature of the turbine;
• in response to the gas producer shaft speed being below a gas producer shaft speed threshold and the temperature of the turbine being within a predetermined range of a turbine temperature threshold, increase the gas producer shaft speed by applying additional power to the gas producer shaft with the power transfer device;
• and
• in response to the gas producer shaft speed being within a predetermined range of the gas producer shaft speed threshold and the turbine temperature being below the turbine temperature threshold, decrease the speed of the gas producer shaft by removing power from the gas producer shaft with the power transfer device.