A method for controlling an electrical power supply network for an aircraft comprising: - at least one generator of a turbo-generator of the aircraft adapted to provide a source of electrical energy from a gas turbine and comprising at least one stator associated with a rectifier, - at least one distribution bus comprising at least one capacitor, - at least one electric motor to be supplied associated with an inverter, and - at least one energy storage means, the method comprising the steps of: - pre-charging said at least one capacitor in normal operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is available, and - precharging said at least one capacitor in backup operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is not available, characterised in that it further comprises a step of: - discharging said at least one capacitor at the end of use of the electrical power supply network when said at least one capacitor is charged, and in that, in backup operating mode, the step of precharging said at least one capacitor is carried out by modifying the electromotive force of said at least one electric motor and by controlling the associated inverter so as to transform a kinetic energy of the electric motor into electrical energy. - at least one generator of a turbo-generator of the aircraft adapted to provide a source of electrical energy from a gas turbine and comprising at least one stator associated with a rectifier, - at least one distribution bus comprising at least one capacitor, - at least one electric motor to be supplied associated with an inverter, and - at least one energy storage means, the method comprising the steps of: - pre-charging said at least one capacitor in normal operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is available, and - precharging said at least one capacitor in backup operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is not available, - pre-charging said at least one capacitor in normal operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is available, and - precharging said at least one capacitor in backup operating mode prior to power-on the electrical power supply network when said at least one capacitor is discharged and the gas turbine is not available, characterised in that it further comprises a step of: - discharging said at least one capacitor at the end of use of the electrical power supply network when said at least one capacitor is charged, - discharging said at least one capacitor at the end of use of the electrical power supply network when said at least one capacitor is charged, and in that, in backup operating mode, the step of precharging said at least one capacitor is carried out by modifying the electromotive force of said at least one electric motor and by controlling the associated inverter so as to transform a kinetic energy of the electric motor into electrical energy.