METHOD OF CONTROLLING A GAS TURBINE POWER PLANT AND GAS TURBINE POWER PLANT

A method of controlling a gas turbine power plant includes controlling at least one of a load (PE) and an exhaust temperature (TE) of a gas turbine engine (5) in accordance with a sliding-mode control technique. A sliding quantity (S; SL; STE) is determined as a function of a control error between a current value and a reference value of a controlled variable. A control law (U(S, t)) has a gain factor (k(S, t)) and a sliding factor (SF(S, t)) and is configured to bring the sliding quantity (S) on a sliding manifold (S'). The sliding factor (SF(S, t)) is a first function of the sliding quantity (S) and a time derivative (k̇(S,t)) of the gain factor (k(S, t)) is a second function of the sliding quantity (S).