Method and device for providing an electrical system alternating voltage in an aircraft

A method for providing an electrical system alternating voltage for an electrical system of an aircraft, comprising the steps of:

• (a) detecting a sudden change in load in the electrical system of the aircraft on the basis of a drop in the supply frequency of the electrical system alternating voltage or in the supply voltage in the electrical system;
• and
• (b) carrying out a frequency compensation control or voltage compensation control by feeding into the electrical system power which is provided by at least one frequency converter which converts an alternating voltage provided by an engine generator of the aircraft into a first output alternating voltage, and by feeding into the electrical system power which is provided by a cyclo-inverter which converts a direct voltage provided by a fuel-cell into a second output alternating voltage which is synchronous with the first output alternating voltage and, together with the first output alternating voltage, constitutes the electrical system alternating voltage of the electrical system.