Systems and methods for controlling a fuel blend for a gas turbine

A method of controlling a fuel blend for a turbine engine, said method comprising:

• supplying a first fuel and a second fuel to a mixer;
• mixing, in the mixer, the first and second fuels together to obtain the fuel blend;
• receiving, from a fuel blend analyzer downstream from the mixer, a measurement indicative of a composition of the fuel blend;
• comparing, by a controller, the fuel blend measurement to an operational model of a combustor;
• determining, based on the comparison, predicted combustion conditions in the combustor associated with the fuel blend measurement;
• controlling, based on the predicted combustion conditions, at least one of the flow of the first fuel and the flow of the second fuel;
• combusting the fuel blend in the combustor;
• receiving, from sensors coupled to the combustor, the sensors including a knock sensor and at least one of an optical sensor, a temperature sensor, and a pressure sensor, combustion signals indicative of combustion behavior in the combustor;
• comparing, by the controller, the predicted combustion conditions to the combustion signals;
• determining, by the controller, whether the predicted combustion conditions match the combustion behavior indicated by the combustion signals;
• and
• updating the operational model if the predicted combustion conditions do not match the indicated combustion behavior.