Abstract:
A semiconductor stack for a converter comprises two series-connected semiconductor switches; two terminals for connecting a cell capacitor, which are connected to one another by the two semiconductor switches; at least one cooling element arranged between the semiconductor switches; a frame, by which the semiconductor switches and the cooling element are fixed to one another and which provides the terminals; and at least two snubber capacitors which are mechanically fixed to the frame and which are connected in parallel, are connected to the terminals and which in each case form a commutation loop with the semiconductor switches.
Abstract:
The invention relates to a pumped storage power plant, in particular to an electric unit 1 comprising a converter 3, a rotating electric synchronous machine 4 and a charging unit 5, wherein the charging unit 5 has at least one transformer 6 and one switch 7 and can be connected to a supply grid 2, on the one hand, and to the converter 3, on the other. The invention also relates to a method for using the electric unit 1 comprising at least opening a generator switch 15 in order to disconnect the synchronous machine 4 from the converter 3; charging cells of the converter 3 which have capacitors and/or accumulators by closing a switch 7 of the charging unit 5, wherein by closing the switch 7 the converter 3 is connected to the supply grid 2 via the transformer 6 of the charging unit 5; opening the switch 7 of the charging unit 5 after the complete charging of the converter 3; and closing the generator switch 15 in order to connect the synchronous machine 4 to the converter 3 and/or the secondary line 11.
Abstract:
A converter arrangement comprises first and second modular multilevel converters, Each of the modular multilevel converters comprises two converter branches. Each converter branch comprises a plurality of series-connected converter cells. Each converter cell comprises a cell capacitor and semiconductor switches for connecting and disconnecting the cell capacitor to the converter branch. At least two converter branches of the first modular multilevel converter are connected via first branch connection point and at least two converter branches of the second modular multilevel converter are connected via second branch connection point. The multilevel converters are connected in parallel via a phase connection point for connecting the converter arrangement to a load or a power source, wherein the phase connection point is connected via a first inductance with the first branch connection point and/or via a second inductance with the second branch connection point. At least one of the modular multilevel converters comprises a protection system.
Abstract:
An energy generation system includes a turbine, an electric generator, a step-up transformer, and a converter. The turbine is operable to extract energy from a fluid flow and convert the extracted energy into mechanical energy. The electric generator is operable to convert the mechanical energy from the turbine into AC electrical energy. The step-up transformer is operable to transfer the AC electrical energy at a lower voltage from the electric generator to a higher voltage. The converter is operable to convert the AC electrical energy at the higher voltage to DC electrical energy. The converter includes a converter leg for a phase of the AC electrical energy. The converter leg has an upper arm with a first plurality of sub-modules and a lower arm with a second plurality of sub-modules. Each sub-module is operable to function as a controlled voltage source.
Abstract:
An energy generation system includes a turbine, an electric generator, a step-up transformer, and a converter. The turbine is operable to extract energy from a fluid flow and convert the extracted energy into mechanical energy. The electric generator is operable to convert the mechanical energy from the turbine into AC electrical energy. The step-up transformer is operable to transfer the AC electrical energy at a lower voltage from the electric generator to a higher voltage. The converter is operable to convert the AC electrical energy at the higher voltage to DC electrical energy. The converter includes a converter leg for a phase of the AC electrical energy. The converter leg has an upper arm with a first plurality of sub-modules and a lower arm with a second plurality of sub-modules. Each sub-module is operable to function as a controlled voltage source.
Abstract:
A power plant, and a method for using an electrical unit therefor are disclosed, wherein, an electrical machine can be connected to a power network via a converter and a block transformer. A method is disclosed for using the electrical unit, wherein the converter disconnects the block transformer from the machine in the event of a malfunction of the block transformer.
Abstract:
A converter arrangement comprises first and second modular multilevel converters, Each of the modular multilevel converters comprises two converter branches. Each converter branch comprises a plurality of series-connected converter cells. Each converter cell comprises a cell capacitor and semiconductor switches for connecting and disconnecting the cell capacitor to the converter branch. At least two converter branches of the first modular multilevel converter are connected via first branch connection point and at least two converter branches of the second modular multilevel converter are connected via second branch connection point. The multilevel converters are connected in parallel via a phase connection point for connecting the converter arrangement to a load or a power source, wherein the phase connection point is connected via a first inductance with the first branch connection point and/or via a second inductance with the second branch connection point. At least one of the modular multilevel converters comprises a protection system.
Abstract:
A pumped-storage power plant is disclosed, such as an electric unit having a converter and a rotating electric synchronous machine. The converter is designed as a modular multilevel converter and the machine is directly connectable to the converter, wherein the converter has an adjustable voltage.
Abstract:
A power plant, and a method for using an electrical unit therefor are disclosed, wherein, an electrical machine can be connected to a power network via a converter and a block transformer. A method is disclosed for using the electrical unit, wherein the converter disconnects the block transformer from the machine in the event of a malfunction of the block transformer.