NOVELTY - The system (10) has a controller (18) for controlling operational behavior of a gas turbine system (12). The controller comprises a droop response system generating response to vary an output of the turbine system in response to indication of frequency variation and a multivariable droop response correction system determining possible errors associated with operational characteristics of the turbine system and generating correction factors to be applied to the response generated by the response system. The correction factors correct the response generated by the response system.    USE - Industrial power generation system e.g. hydroelectric power generating system and geothermal power generating system.    ADVANTAGE - The system allows fuel flow and the intake of the gas turbine system to be decreased to a reduced power output so as to maintain balance among the gas turbine system, a generator and a power grid of the system. The system provides a multivariable droop response correction system to adjust a normal fuel flow command such that droop power response is irrespective of ambient operating conditions and a load level of the gas turbine system for variation in frequency of the power grid, so that the multivariable droop response correction system enables the frequency droop response of the gas turbine system to be consistent and repeatable throughout.    DETAILED DESCRIPTION - The operational characteristics are selected from a group consisting of ambient conditions of the turbine system and load levels of the turbine system. INDEPENDENT CLAIMS are also included for the following:    (1) a method for controlling droop response of gas turbines of power generation systems    (2) a non-transitory computer-readable medium comprising a set of instructions for controlling droop response of gas turbines of power generation systems.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a power generation system including a controller.    Industrial power generation system (10)    Gas turbine system (12)    Controller (18)    Compressor (26)    Intake (28)