Abstract: The invention relates to a turbine generator set comprising a turbine and a generator coupled to each other without a step-down gear box, and a static frequency converter connected in series between said generator and an AC electricity grid having a given operating frequency, said static frequency converter operating while the turbine generator set is generating electricity to convert the frequency of the voltage and of the current delivered by the generator into the given operating frequency of the AC electricity grid. According to the invention, while the turbine generator set is being started, said static frequency converter powers the generator which operates as a motor so as to ignite the combustion chambers of the turbine, by taking power from the AC electricity grid.