Gas turbine fuel supply method and arrangement

An arrangement for controlling a supply of a fuel to a combustor of a gas turbine comprising a compressor upstream of the combustor, the arrangement comprising:

• a fuel valve adapted to supply the fuel to the combustor;
• a processor adapted
• to obtain an inlet air pressure (PT7) at a compressor inlet;
• to obtain an inlet air temperature (Tinlet) at the compressor inlet;
• to obtain an outlet air pressure (PT8) at a compressor outlet;
• to obtain an air bleed signal (THBOV) indicative of an amount of air not supplied to the combustor;
• to estimate a heat input (HIengmodel) of the fuel supplied to the combustor based on the inlet air pressure, the inlet air temperature, the outlet air pressure and the air bleed signal (THBOV);
• to compare the estimated heat input (HIengmodel) with a demanded heat input (FFDEM) to derive an error signal;
• and
• to control the fuel valve regulating the supply of the fuel to the combustor based on the error signal.