In this paper, the transient responses of different dynamic models of a generator drive single shaft gas turbine working in parallel with electrical mains, have been analyzed.
The time variations of the main thermodynamic and performance parameters are obtained by varying the fuel valve position, for an assigned IGV angle, and by varying the IGV angle for an assigned fuel valve position.
The influence of the dynamic phenomena due to the working gas mass contained in the gas turbine component volumes, of the metal mass thermal inertia and of the heat transfers, are taken separately into account. The dynamic balance of rotating masses is not instead considered, since the single shaft gas turbine works in parallel with electrical mains.
The developed analysis has shown the negligible influence of the phenomena due to the working gas mass contained in the gas turbine component volumes and a more significative effect of the metal mass inertia and of the heat transfers on the transient response. In particular, this influence is significative only for gas turbine and compressor outlet temperatures.
The influence on the gas turbine transient behaviour of the control system that uses the gas turbine outlet temperature in feedback has been also evaluated.
