The problem of the output voltage of a synchronous generator regulation is considered in the paper. We assume, that the generator has symmetrical windings. The control inputs are synthesized with the help of a switch converter, which is connected to a capacitor and a storage battery. To form a given output voltage, the desired values for the currents in the generator stator windings are computed, taking into account their active resistance and the value of the external load, which is either estimated using the state observer or assumed to be known. According to the computed reference currents, the control inputs for the switch power converter are synthesized.