Systems for controlling a fuel blend for a gas turbine

A fuel control system for a turbine engine, said system comprising:

• a fuel supply system comprising a mixer for use in mixing a first fuel and a second fuel together to obtain a fuel blend;
• a fuel blend analyzer downstream from the mixer;
• a combustor downstream from the fuel blend analyzer, the combustor operable with the fuel blend;
• a knock sensor coupled to the combustor;
• at least one second sensor coupled to the combustor, the at least one second sensor formed as one of an optical sensor, a temperature sensor, or a pressure sensor;
• and
• a controller communicatively coupled to the knock sensor, the at least one second sensor, and the fuel blend analyzer, the controller comprising at least one processor in communication with at least one memory device, the at least one processor configured to:
• receive, from the fuel blend analyzer, a measurement indicative of a composition of the fuel blend;
• compare the fuel blend measurement to an operational model of the combustor;
• determine, based on the comparison, a predicted combustion condition in the combustor associated with the fuel blend measurement;
• control, based on the predicted combustion condition, at least one of a flow of the first fuel and a flow of the second fuel, wherein the first fuel is one of a natural gas, a liquefied petroleum gas, and a hydrocarbon gas fuel;
• combust the fuel blend in the combustor;
• receive, from the knock sensor and the at least one second sensor, combustion signals indicative of combustion behavior in the combustor;
• compare the predicted combustion condition to the combustion signals;
• determine whether the predicted combustion condition matches the combustion behavior indicated by the combustion signals;
• and
• update the operational model if the predicted combustion condition does not match the indicated combustion behavior, wherein the updating includes at least one of associating a measurement of the fuel blend with an operating parameter monitored by the at least one second sensor, and changing the operational model.