Siemens Aktiengesellschaft

Marcos Pereira

Kadry Sadek

Hans-Joachim Knaak

Andreas Zenkner

Wilfried Breuer

A submodule for forming a multilevel power converter for electric energy distribution and transmission, includes a capacitor unit and a power semiconductor circuit having power semiconductors that can be switched off. The capacitor unit and the power semiconductor circuit are interconnected in such a way that, depending on the actuation of the power semiconductors of the power semiconductor circuit, at least the voltage released at the capacitor unit or a zero voltage can be generated at output terminals of the submodule. The submodule is not only able to compensate for reactive power, but to exchange active power with a connected alternating current network. An additional energy storage device is connected to the capacitor unit through a chopper unit for regulating current flow between the additional energy storage device and the capacitor unit.

Submodule for a multi-stage power converter having additional energy storage device

An electrical installation has a container which encloses high-voltage components. The electrical installation can be fitted inexpensively and quickly, and at the same time provide sufficient cooling of the high-voltage components. A control room with control elements and/or display elements of the electrical installation and a cool room with a cooling device for at least one of the high-voltage components are disposed in the interior of the container.

Electrical installation having a container

A device for transmitting electric power between alternating voltage networks includes converters interconnected by direct current lines and provided each with several six-pulse conversion bridges. The six-pulse conversion bridges of one same converter are capable of being connected to an alternating voltage network associated with the converters via inductances differently phase-shifted. A control unit is provided to energize the valves of the six-pulse conversion bridges. The device is more economical and the converters are interconnected by a plurality of direct current circuits, each direct current circuit being galvanically separated from at least an alternating voltage network.

Twelve-pulse HVDC transmission

A device (), for adjusting the impedance of a high voltage line (), supplying an alternating current, has at least one control coil (), which may be inserted in series in the high voltage line () and at least one switching device (), provided for each control coil (). The device is compact and economical. A control unit () for controlling each switching device () is also provided, such that the reactance of the control coil (), acting in the device may be adjusted by the switching of the switching device (), whereby each switching device () is arranged parallel to the corresponding control coil () in a parallel branch ().

Device for adjusting the impedance of a high voltage line supplying an alternating current

The invention relates to a hybrid for an AC mains system, with the hybrid filter having a passive and an active filter which are electrically connected in series, and with the active filter having a voltage source. According to the invention, a tuned filter, which is tuned to the rated frequency of the AC mains system, is electrically connected in parallel with the active filter. This results in a hybrid filter for an AC mains system, whose active filter is not loaded by the fundamental current component.

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Erlangen, Germany

Marcos Pereira