Abstract: A device controls a power flow in an AC network and has a series converter with a DC side to connect to a DC link and an AC side to connect to the AC network via a series transformer. The device further has a bridging arrangement between the series transformer and the series converter configured to bridge the series converter. The bridging arrangement contains at least one bridging branch having a switching unit with antiparallel thyristors and a resistance in series with the switching unit. Furthermore, a method of operation operates the device.

Abstract: A device for stabilizing an AC voltage grid includes a power converter having an AC voltage side for connection to the AC voltage grid and a DC voltage side having two DC voltage poles. An energy storage arrangement is connected on the DC voltage side of the converter between the DC voltage poles. A controlled load for absorbing active power or consuming active power is disposed in series or parallel with the energy storage arrangement. A method is also provided for stabilizing an AC voltage grid by using the device.

Abstract: A converter has a plurality of partial converters, each partial converter having three-phase converter-side supply connections for parallel connection to the same electrical three-phase supply system and three-phase converter-side output connections with a star point for making contact with a star point of a three-phase output system. The converter-side output connections of the three-phase partial converters are connected in parallel. The partial converters each have a converter module for each partial converter-side three-phase supply connection, and the converter modules each have two or more submodules having their outputs connected in series, and a transformer.

Abstract: An arrangement has a converter with an electrical series circuit of modules each having four electronic switching elements and an electrical energy storage device. The arrangement also has a cooling device for cooling the electronic switching elements by way of a liquid coolant and a heat exchanger and a control unit for controlling the electronic switching elements. The control unit controls the electronic switching elements in such a manner that at least one current harmonic is generated in the series circuit if the temperature of the liquid coolant or the temperature of a medium, which is intended to absorb the heat at the heat exchanger, falls below a predetermined limit temperature.

Abstract: A power converter path of a modular multilevel power converter includes a multiplicity of modules forming an electrical series circuit. The series circuit includes four groups of modules, of which two successive or sequential groups are disposed one above the other in a tower structure. A modular multilevel power converter with a power converter path is also provided.

Abstract: A device for controlling a load flow in an alternating-voltage network includes first and second modular series connections of double-pole switching modules interconnected in a parallel circuit to be inserted in series into a phase line of the alternating-voltage network. At least one switching module of each connection has an energy store and semiconductor switches to be switched on and off. The semiconductor switches can be controlled in such a way that a switching module voltage can be generated at terminals of the switching module. The switching module voltage corresponds to a positive or negative storage voltage or a zero voltage. A control apparatus for controlling the switching modules is configured to generate an equalizing current between the modular series connections. A method for controlling a load flow by using the device is also provided.

Abstract: An apparatus for supplying power to a high-capacity load includes a three-to-two phase transformer including an input side three-phase transformer terminal for connection to a three-phase supply grid and output side first and second output-side single-phase transformer terminals. A converter arrangement has a first partial converter including a first input-side, single-phase AC voltage terminal for the first output-side transformer terminal and a first single-phase output terminal. A second partial converter has a second input-side single-phase AC voltage terminal for the second output-side transformer terminal and a second single-phase output connector. The partial converters are mutually connectable by the output terminals in an output-side series and/or parallel circuit and form a single-phase load terminal for the high-capacity load. A method for supplying power to a high-capacity load is also provided.

Abstract: An arrangement has a converter with an electrical series circuit of modules each having four electronic switching elements and an electrical energy storage device. The arrangement also has a cooling device for cooling the electronic switching elements by way of a liquid coolant and a heat exchanger and a control unit for controlling the electronic switching elements. The control unit controls the electronic switching elements in such a manner that at least one current harmonic is generated in the series circuit if the temperature of the liquid coolant or the temperature of a medium, which is intended to absorb the heat at the heat exchanger, falls below a predetermined limit temperature.

Abstract: A converter has a plurality of partial converters, each partial converter having three-phase converter-side supply connections for parallel connection to the same electrical three-phase supply system and three-phase converter-side output connections with a star point for making contact with a star point of a three-phase output system. The converter-side output connections of the three-phase partial converters are connected in parallel. The partial converters each have a converter module for each partial converter-side three-phase supply connection, and the converter modules each have two or more submodules having their outputs connected in series, and a transformer.

Abstract: A converter arrangement converts an alternating input voltage having an input frequency into an alternating output voltage having an output frequency. The converter arrangement includes a direct converter on an input side having a plurality of input terminals and input-side converter units, transformers, the number of which matches the number of input terminals, and a direct converter on an output side having output-side converter units, and a number of output terminals, which number matches the number of input terminals. Each transformer is connected on the primary side to each input terminal via one each input-side converter unit, and is connected on the secondary side to each output terminal via one each output-side converter unit.

Abstract: A multiphase multilevel power converter includes a phase module having submodules with an energy storage device. An energy storage device voltage is connectable and disconnectiable as a submodule voltage between two submodule poles. To attenuate higher-frequency components of the connection voltage, a passive frequency filter is provided for each phase module, having a resonant frequency above a sampling frequency of a digital regulating system connecting disconnected submodule voltages and disconnecting connected submodule voltages at successive sampling times. To avoid exciting the point of resonance of the frequency filter, the drive has a controller briefly connecting and again disconnecting at least one of the disconnected submodule voltages at least once within a sampling interval of the regulating system for a submodule voltage connected by the regulating system. A method for driving the multiphase multilevel power converter is also provided.

Abstract: An apparatus for supplying power to a high-capacity load includes a three-to-two phase transformer including an input side three-phase transformer terminal for connection to a three-phase supply grid and output side first and second output-side single-phase transformer terminals. A converter arrangement has a first partial converter including a first input-side, single-phase AC voltage terminal for the first output-side transformer terminal and a first single-phase output terminal. A second partial converter has a second input-side single-phase AC voltage terminal for the second output-side transformer terminal and a second single-phase output connector. The partial converters are mutually connectable by the output terminals in an output-side series and/or parallel circuit and form a single-phase load terminal for the high-capacity load. A method for supplying power to a high-capacity load is also provided.

Abstract: A multiphase multilevel power converter includes a phase module having submodules with an energy storage device. An energy storage device voltage is connectable and disconnectiable as a submodule voltage between two submodule poles. To attenuate higher-frequency components of the connection voltage, a passive frequency filter is provided for each phase module, having a resonant frequency above a sampling frequency of a digital regulating system connecting disconnected submodule voltages and disconnecting connected submodule voltages at successive sampling times. To avoid exciting the point of resonance of the frequency filter, the drive has a controller briefly connecting and again disconnecting at least one of the disconnected submodule voltages at least once within a sampling interval of the regulating system for a submodule voltage connected by the regulating system. A method for driving the multiphase multilevel power converter is also provided.

Abstract: A modular multilevel power converter includes first electric components on a first vehicle and second electric components on a second vehicle. The first vehicle and the second vehicle are placed at a spacing distance from each other. The first electric components and the second electric components are electrically interconnected by a plurality of first connecting conductors.

Abstract: A converter arrangement converts an alternating input voltage having an input frequency into an alternating output voltage having an output frequency. The converter arrangement includes a direct converter on an input side having a plurality of input terminals and input-side converter units, transformers, the number of which matches the number of input terminals, and a direct converter on an output side having output-side converter units, and a number of output terminals, which number matches the number of input terminals. Each transformer is connected on the primary side to each input terminal via one each input-side converter unit, and is connected on the secondary side to each output terminal via one each output-side converter unit.

Abstract: An arrangement for controlling a power flow in an AC voltage grid includes a converter arrangement having a first converter and a second converter. The converters are connectable to one another on the DC voltage side through a DC voltage link and are each connectable to the AC voltage grid on the AC voltage side. During the operation of the arrangement, the converters are correspondingly connected to the AC voltage grid. A switching branch is provided in the DC voltage link in parallel with the converters and at least one controllable switching element is provided in the switching branch. A method for protecting the arrangement in the case of an overload is also provided.

Abstract: A device for controlling a load flow in an alternating-voltage network includes first and second modular series connections of double-pole switching modules interconnected in a parallel circuit to be inserted in series into a phase line of the alternating-voltage network. At least one switching module of each connection has an energy store and semiconductor switches to be switched on and off. The semiconductor switches can be controlled in such a way that a switching module voltage can be generated at terminals of the switching module. The switching module voltage corresponds to a positive or negative storage voltage or a zero voltage. A control apparatus for controlling the switching modules is configured to generate an equalizing current between the modular series connections. A method for controlling a load flow by using the device is also provided.

Abstract: A transmission device transmits energy between multiple electrical energy networks, each providing a multi-phase connection voltage at a network frequency for electrical energy supply. The transmission device contains multi-phase multi-stage rectifiers and a control device, which adjusts the transmission of energy into at least one energy-receiving energy network according to an input by controlling the multi-stage rectifiers. The multi-stage rectifiers are each connected to one of the energy networks and to one another via at least one multi-phase transformer. Electrical energy flows via the transformer at a predefined transmission frequency from at least one energy-emitting energy network into at least one energy-receiving energy network. The transmission frequency is, in particular, multiple times the network frequency.

Abstract: A power converter path of a modular multilevel power converter includes a multiplicity of modules forming an electrical series circuit. The series circuit includes four groups of modules, of which two successive or sequential groups are disposed one above the other in a tower structure. A modular multilevel power converter with a power converter path is also provided.

Abstract: A modular multilevel converter has a plurality of sub-modules, each of which includes at least two electronic switching elements and an electrical energy storage device. The sub-modules are controlled by a control device. An optical output of the control device of the converter is connected to an input of an optical distributor by way of a first optical waveguide. A plurality of outputs of the optical distributor are individually connected to an optical input of one of the sub-modules, respectively, by way of a second optical waveguide.