Gas turbine control system

A control system for a gas turbine (2), wherein a number of regulators (24) generate respective control signals (P1–P6) selectable (25) to regulate (27) fuel supply to a combustion chamber (5) of said gas turbine;

• said regulators comprising at least one speed/load regulator receiving at least one first feedback signal (NT1–NT6, NT) related to the speed of said gas turbine (2), and at least one second feedback signal (PEL1, PEL2, PEL) related to the power supplied by said gas turbine;
• characterized in that said speed/load regulator comprises a first regulating block (60), in particular a proportional-integral regulator, receiving a first error signal (ΔN) related to the difference between said first feedback signal (NT1–NT6, NT) and a reference speed value (Vref);
• said speed/load regulator also comprising a second regulating block (64), in particular a proportional-integral regulator, separate from the first regulating block (60) and receiving a second error signal (ΔP) related to the difference between said second feedback signal (PEL1, PEL2, PEL) and a reference load value;
• said speed/load regulator also comprising selecting means (62) for selecting the output of said first regulating block (60) during a control step of the speed of said gas turbine, and for selecting said second regulating block (64) during a control step of the load of said gas turbine.