Resumo:
Gas turbines are widely used as primary drives in the transport, mechanical drive and
electricity generation sectors. The operational profile of these machines is becoming more
dynamic and flexible, due to the continuous search for expansion of its operational envelope.
Aeroderivative gas turbines, such as the turbine in the case study of this work, are used for
numerous purposes such as pump drives, compressors and as well as electrical energy
generation. The model developed in this work aimed to evaluate a new electric power
generation topology for an FPSO (Floating Production Storage and Offloading) that
traditionally uses gas turbogenerators operating in parallel, not which the main purpose was to
study the behavior of a synchronous generator and an induction generator operating in parallel.
The work presents a computational model of 30.7 MW aeroderivative turbogenerators driving
generators, which was developed using a library integrated to Matlab / Simulink called TMATS, developed by NASA's Glenn Research Center. The developed model was evaluated
under steady state conditions for validation and calibration purposes, the parameter with the
lowest precision for this condition of obtaining obtained a relative error of 0.94%. Then the
model was subjected to different load changes to evaluate the machine's dynamic behavior
under different environmental conditions. Data from manufacturers' manuals and field
operations data were used to validate the model, which showed good accuracy to simulate the
behavior of the turbogenerator when activated synchronous electric generators affected a higher
relative error of 0.77%. Then, the dynamic behavior of two turbogenerators operating in parallel
was evaluated when subjected to typical operating conditions of an isolated FPSO system,
where one of the turbogenerators drives a synchronous generator and another induction
generator. The proposed arrangement presents stable results when the synchronous generator
absorbs all the load demand and the induction generator is kept at full load.
