Apparatus and method to control supplying fuel to a gas turbine system

A method to control supplying of fuel to a gas turbine system, the method comprising:

• feeding fuel to a gas turbine system that includes a first fuel for a pre-defined normal operation of the gas turbine system, the first fuel passable from a source of the first fuel to a mixing device via a first fuel conduit for being fed to the gas turbine system, the fuel being fed to the gas turbine system for the pre-defined normal operation of the gas turbine system including only the first fuel or a combination of the first fuel and a second fuel that is also fed to the mixing device for being fed to the gas turbine system;
• detecting a transient condition that results in a flow of the first fuel ceasing or being supplied at a flow rate below a minimum flow rate needed for operation of the gas turbine system;
• adjusting a control parameter for a feed valve of a third fuel conduit, in response to detecting the transient condition, that connects a source of a third fuel to the mixing device for feeding the third fuel to the gas turbine system so that a rate of adjustment of a position of the feed valve of the third fuel conduit is reduced for a transient condition time period;
• and
• controlling the feed valve of the third fuel conduit to feed the third fuel from the source of the third fuel to the gas turbine system based on the adjusted control parameter for the feed valve of the third fuel conduit to supply the third fuel to the gas turbine system to account for the loss of the first fuel that resulted in the detected transient condition so that the gas turbine system combusts the third fuel and avoids a flame out condition.