Gas turbine engine system

A gas turbine engine system (10) is provided. The system includes an electrical generator (24) configured to provide electrical energy to a load, a gas turbine engine including at least one combustor (14) including a plurality of fuel injection points configured to receive a flow of fuel from a plurality of corresponding flow control devices, and a fuel control system (28). The fuel control system includes a plurality of sensors (26) positioned about the gas turbine engine system and configured to measure at least one parameter associated with the sensor and a processor. The processor is programmed to receive a signal from at least one of the plurality of sensors indicative of a composition of the fuel, using a flow model and at least one signal, determine the physical properties of a fuel at an inlet (20) to the flow control devices, determine a corresponding correction to a gas fuel flow gain using the determined physical properties, and automatically control fuel delivery and fuel split between the fuel injection points on the combustor using the determined flow gain to facilitate permitting a relatively large variation in the fuel composition for use in the gas turbine engine.