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This paper describes the modeling and simulation of a generator system using an efficient, high-speed, high power density generator that generates up to 1 MW of high voltage DC electrical power continuously and can be used for aerospace or land applications requiring large power and compact installations. This generator system simulated comprises a brushless wound field electric machine, a generator control unit (GCU) and a bridge rectifier. The purposes of the model are: obtaining simulation results to predict the behavior of the generator system during operational transients, characterizing the power quality and selecting the filters, and tuning the control parameters of the GCU.