Abstract: A method is disclosed for operating an energy installation having a wind turbine or water turbine connected to a generator, a converter unit connected on the generator side to the generator, and an auxiliary energy unit for providing electrical energy to cover an intrinsic energy demand of the energy installation. The converter unit is connected to an electric power grid and feeds electrical energy generated by the generator into the electric power grid via the converter unit. The auxiliary energy unit is connected to the electric power grid for drawing electrical energy. In the event of a separation of the converter unit and of the auxiliary energy unit from the electric power grid, the auxiliary energy unit draws electrical energy from an energy storage unit for an adjustable period of time, and the auxiliary energy unit then draws electrical energy generated by the generator via the converter unit.

Abstract: A method is disclosed for operating an energy installation having a wind turbine or water turbine connected to a generator, a converter unit connected on the generator side to the generator, and an auxiliary energy unit for providing electrical energy to cover an intrinsic energy demand of the energy installation. The converter unit is connected to an electric power grid and feeds electrical energy generated by the generator into the electric power grid via the converter unit. The auxiliary energy unit is connected to the electric power grid for drawing electrical energy. In the event of a separation of the converter unit and of the auxiliary energy unit from the electric power grid, the auxiliary energy unit draws electrical energy from an energy storage unit for an adjustable period of time, and the auxiliary energy unit then draws electrical energy generated by the generator via the converter unit.

Abstract: A method is disclosed for determining the rotor angular position of a rotating electrical machine, which machine has a set of stator windings and a set of rotor windings, and in which method the set of stator windings is fed by an associated converter unit. First, the set of stator windings is then short-circuited at at least three predeterminable short-circuiting times by means of the converter unit within one revolution of the rotor given an assumed speed of the rotor. Then, the phase angle of the respective stator current is determined at each short-circuiting time, a differential phase angle being formed from phase angles determined at in each case two temporally adjacent short-circuiting times.

Abstract: A method is specified for determining the rotor position of a separately excited rotating electrical machine which machine has a stator winding set and a rotor winding set and in which method the stator winding set is fed from an associated converter unit, and the rotor winding set is fed from an associated exciter unit. First of all, the stator winding set is short-circuited by means of the converter unit. An exciter voltage signal is then applied to the rotor winding set by means of the exciter unit, which exciter voltage signal has a change from a variable first voltage value to a variable second voltage value: Furthermore, the stator current (Isa, Isb, Isc) is determined in each winding of the stator winding set, and a rotor position angle (?) is calculated.

Abstract: A method is suggested for determining the angular position of the rotor in a rotating electric machine, which machine has a stator winding set with at least three stator windings, and the stator winding set is powered by a converter device. Firstly, a first voltage (U1) is applied to the stator winding set via the converter device within a first definable time period (tx1), and a first current gradient ( ? i ? t ? | U 1 ) is calculated therefor, and a second voltage (U2) is applied to the stator winding set via the converter device within the first definable time period (tx1), and a second current gradient ( ? i ? t ? | U ? ? 2 ) is calculated therefor.

Abstract: A method is suggested for determining the angular position of the rotor in a rotating electric machine, which machine has a stator winding set with at least three stator windings, and the stator winding set is powered by a converter device. Firstly, a first voltage (U1) is applied to the stator winding set via the converter device within a first definable time period (tx1), and a first current gradient ( ? i ? t ? | U ? ? ? 1 ) is calculated therefor, and a second voltage (U2) is applied to the stator winding set via the converter device within the first definable time period (tx1), and a second current gradient ( ? i ? t ? | U ? ? ? 2 ) is calculated therefor.

Abstract: A method is disclosed for determining the rotor angular position of a rotating electrical machine, which machine has a set of stator windings and a set of rotor windings, and in which method the set of stator windings is fed by an associated converter unit. First, the set of stator windings is then short-circuited at at least three predeterminable short-circuiting times by means of the converter unit within one revolution of the rotor given an assumed speed of the rotor. Then, the phase angle of the respective stator current is determined at each short-circuiting time, a differential phase angle being formed from phase angles determined at in each case two temporally adjacent short-circuiting times.