Abstract: Provided is a method for controlling a wind power installation and/or a wind farm having at least one wind power installation, particularly in the case of asymmetrical network voltages, comprising: measuring a first voltage of a first phase, a second voltage of a second phase and a third voltage of a third phase of a three-phase electrical system, calculating a symmetrical negative-sequence voltage system from the measured voltages including a first negative-sequence voltage, a second negative-sequence voltage and a third negative-sequence voltage, predefining setpoints for a negative-sequence current system depending on the calculated, symmetrical negative-sequence voltage system including a first negative-sequence current component, a second negative-sequence current component and a third negative-sequence current component, wherein the setpoints are defined such that a balancing of the measured voltages is achieved, feeding an asymmetrical three-phase AC current into a wind farm network or an electrical su

Abstract: A method for controlling a wind power installation includes measuring a grid voltage of an electrical power supply grid, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.

Abstract: A method for feeding electrical power into an electrical, three-phase supply network by means of an inverter device, wherein the electrical supply network has a three-phase line voltage with a first, second and third line voltage phase, comprising the steps: feeding the electrical power during normal operation if a fault-free operation has been identified for the electrical supply network, wherein during normal operation a positive sequence voltage and optionally a negative sequence voltage is recorded from the line voltage and a reactive current is specified at least depending on the positive sequence voltage and optionally depending on the negative sequence voltage, and changing to a fault operation if a voltage change in the line voltage meets a predetermined fault criterion, in particular if the voltage change exceeds a predeterminable minimum amount of change or a minimum amount of change gradient, wherein during the fault operation, at least directly after the change, the reactive current is specified d

Abstract: A charging station for charging a plurality of electric vehicles, in particular electric cars, comprising: a supply device, in particular for connecting to an electricity supply grid, for supplying the charging station with electric power, a plurality of charging terminals each for charging at least one electric vehicle, and each charging terminal comprises a supply input for drawing electric power from the supply device, a charging output having one or more charging terminals each for outputting a charging current for respectively charging a connected electric vehicle, and at least one DC current controller, arranged between the supply input and the charging output, for generating a respective controlled current from the electric power from the supply device, wherein each charging current (IL1, IL2) is formed from a controlled current or from a plurality of controlled currents (IS1, IS2, IS3), and wherein the charging terminals are connected to one another at exchange terminals by way of electrical exchange

Abstract: A method for operating a charging station for charging a plurality of electric vehicles, in particular electric cars, wherein the charging station is connected at a grid connection point to an electrical supply grid in order to be supplied with electrical energy from the electrical supply grid via said grid connection point, comprising the steps of drawing electrical energy from the electrical supply grid and charging one or more electric vehicles using the electrical energy drawn from the electrical supply grid, wherein the charging station is controlled in such a way that the electrical supply grid is electrically supported.

Abstract: A charging station for charging electric vehicles is provided. The charging station includes a plurality of AC charging terminals, each for charging an electric vehicle by means of alternating current. Each of the AC charging terminals is connected to a three-phase power supply via a respective phase-change device in order to be supplied thereby with three-phase electric current. The power supply has three supply lines for providing three voltage phases, and each AC charging terminal has three connection lines for connection to the three supply lines, for applying the three voltage phases to the connection lines. Each phase-change device is set up to change a connection assignment between the three supply lines and the three connection lines.

Abstract: A charging station for charging a plurality of electric vehicles, in particular electric automobiles, comprising: a supply device, in particular for connection to an electricity supply grid for supplying the charging station with electric power, a plurality of charging terminals for charging in each case at least one electric vehicle, and each charging terminal comprises a supply input for drawing electric power from the supply device, a charging output with one or more charging connections for outputting a respective charging current for charging a respective connected electric vehicle, and at least one DC chopper arranged between the supply input and the charging output in order to generate a respective chopper current from the electric power of the supply device, or as an alternative at least one chopper terminal arranged between the supply input and the charging output in order to provide a chopper current generated outside the charging terminal by a DC chopper, in particular chopper current generated in

Abstract: A method for controlling a wind power installation, comprising the following steps: measuring a grid voltage of an electrical power supply grid, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.

Abstract: Provided is a method for controlling a wind power installation and/or a wind farm having at least one wind power installation, particularly in the case of asymmetrical network voltages, comprising: measuring a first voltage of a first phase, a second voltage of a second phase and a third voltage of a third phase of a three-phase electrical system, calculating a symmetrical negative-sequence voltage system from the measured voltages including a first negative-sequence voltage, a second negative-sequence voltage and a third negative-sequence voltage, predefining setpoints for a negative-sequence current system depending on the calculated, symmetrical negative-sequence voltage system including a first negative-sequence current component, a second negative-sequence current component and a third negative-sequence current component, wherein the setpoints are defined such that a balancing of the measured voltages is achieved, feeding an asymmetrical three-phase AC current into a wind farm network or an electrical su

Abstract: A charging station for charging a plurality of electric vehicles, in particular electric automobiles, comprising: a supply device, in particular for connection to an electricity supply grid for supplying the charging station with electric power, a plurality of charging terminals for charging in each case at least one electric vehicle, and each charging terminal comprises a supply input for drawing electric power from the supply device, a charging output with one or more charging connections for outputting a respective charging current for charging a respective connected electric vehicle, and at least one DC chopper arranged between the supply input and the charging output in order to generate a respective chopper current from the electric power of the supply device, or as an alternative at least one chopper terminal arranged between the supply input and the charging output in order to provide a chopper current generated outside the charging terminal by a DC chopper, in particular chopper current generated in

Abstract: A method for feeding electrical power into an electrical, three-phase supply network by means of an inverter device, wherein the electrical supply network has a three-phase line voltage with a first, second and third line voltage phase, comprising the steps: feeding the electrical power during normal operation if a fault-free operation has been identified for the electrical supply network, wherein during normal operation a positive sequence voltage and optionally a negative sequence voltage is recorded from the line voltage and a reactive current is specified at least depending on the positive sequence voltage and optionally depending on the negative sequence voltage, and changing to a fault operation if a voltage change in the line voltage meets a predetermined fault criterion, in particular if the voltage change exceeds a predeterminable minimum amount of change or a minimum amount of change gradient, wherein during the fault operation, at least directly after the change, the reactive current is specified d

Abstract: A charging station for charging a plurality of electric vehicles, in particular electric cars, comprising: a supply device, in particular for connecting to an electricity supply grid, for supplying the charging station with electric power, a plurality of charging terminals each for charging at least one electric vehicle, and each charging terminal comprises a supply input for drawing electric power from the supply device, a charging output having one or more charging terminals each for outputting a charging current for respectively charging a connected electric vehicle, and at least one DC current controller, arranged between the supply input and the charging output, for generating a respective controlled current from the electric power from the supply device, wherein each charging current (IL1, IL2) is formed from a controlled current or from a plurality of controlled currents (IS1, IS2, IS3), and wherein the charging terminals are connected to one another at exchange terminals by way of electrical exchange

Abstract: A wind park for feeding power into a supply network at a connection point is provided. The wind park includes wind turbines for generating the power, a DC network for transmitting the power to the connection point, an inverter configured to transform electrical DC voltage into an AC voltage for feeding the power into the supply network, at least one DC-DC converter for feeding the power into the DC network. The DC-DC converter includes a switching device and a transformer with primary and secondary sides. The primary side is coupled to the at least one wind turbine via the switching device and the secondary side is coupled to the DC park network via at least one rectifier. The DC-DC converter is configured to apply a DC voltage of changing polarity to the primary side by the switching device to transform a DC voltage of the at least one wind turbine.

Abstract: A method for recording the magnitude and phase of electrical voltage in an electrical three-phase supply network for a fundamental and at least one harmonic is provided. The method includes measuring an electrical three-phase voltage of the supply network, transforming the measured voltage values into polar coordinates using a rotating voltage phasor for the fundamental as a measured reference phasor, and respectively observing values of at least one voltage phasor for the fundamental and of at least one voltage phasor for at least one harmonic to be recorded with the aid of a state observer, and tracking the observed values on the basis of the measured reference phasor.

Abstract: A method for operating a charging station for charging a plurality of electric vehicles, in particular electric cars, wherein the charging station is connected at a grid connection point to an electrical supply grid in order to be supplied with electrical energy from the electrical supply grid via said grid connection point, comprising the steps of drawing electrical energy from the electrical supply grid and charging one or more electric vehicles using the electrical energy drawn from the electrical supply grid, wherein the charging station is controlled in such a way that the electrical supply grid is electrically supported.

Abstract: A wind park for feeding power into a supply network at a connection point is provided. The wind park includes wind turbines for generating the power, a DC network for transmitting the power to the connection point, an inverter configured to transform electrical DC voltage into an AC voltage for feeding the power into the supply network, at least one DC-DC converter for feeding the power into the DC network. The DC-DC converter includes a switching device and a transformer with primary and secondary sides. The primary side is coupled to the at least one wind turbine via the switching device and the secondary side is coupled to the DC park network via at least one rectifier. The DC-DC converter is configured to apply a DC voltage of changing polarity to the primary side by the switching device to transform a DC voltage of the at least one wind turbine.

Abstract: A method for recording the magnitude and phase of the electrical voltage in an electrical three-phase supply network for a fundamental and at least one harmonic is provided. The method includes measuring an electrical three-phase voltage of the supply network, transforming the measured voltage values into polar coordinates using a rotating voltage phasor for the fundamental as a measured reference phasor, and respectively observing values of at least one voltage phasor for the fundamental and of at least one voltage phasor for at least one harmonic to be recorded with the aid of a state observer, and tracking the observed values on the basis of the measured reference phasor.

Abstract: A method for controlling a synchronous generator of a gearless wind turbine is disclosed. The synchronous generator has an electrodynamic rotor and a stator for producing electrical power by rotating the rotor relative to the stator. The method includes generating a multiphase output current at the stator, supplying the output current to a rectifier, and controlling the output current using the rectifier in such a manner that a torque ripple of the generator is reduced.