Multiple control loop acceleration of turboalternator after reaching self-sustaining speed previous to reaching synchronous speed

A method for operating a gas turbine engine after the engine reaches self-sustaining speed but prior to the engine reaching synchronous speed, comprising the steps of:

• a) sensing that the turbine engine has reached self-sustaining speed;
• b) disabling an external electric source;
• c) defining a moderate EGT;
• d) creating a table for looking up acceleration rates based upon a function with variables of (1) speed of the engine rotor or turbine drive shaft, (2) temperature of the compressed air supplied to the combustion chamber, and (3) EGT;
• e) enabling a timing device;
• f) monitoring the EGT of the gas turbine engine, the speed and acceleration rate of the gas turbine engine, and the temperature of compressed air supplied to a combustion chamber for combustion of the gas turbine engine;
• g) requesting an acceleration rate from the table by a control system;
• h) enabling a PID controller of the control system to request a fuel valve position based upon the requested acceleration rate and an actual acceleration rate of the gas turbine engine;
• i) enabling a PID controller to request a fuel valve position based upon the defined moderate EGT and an actual EGT of the gas turbine engine;
• j) selecting the requested fuel valve position based upon the request that results in the lesser amount of fuel being supplied to the combustion chamber;
• k) exiting the control system upon the engine reaching synchronous speed;
• l) exiting the control system upon the engine not reaching synchronous speed within a predetermined time in order to shutdown and purge the combustion chamber;
• and
• m) repeating steps (f)-(m) until synchronous speed is reached.