Siemens Aktiengesellschaft

Siemens Energy Global Gmbh & Co. Kg

Jonas Pinkwart

Martin Pieschel

Hans-Joachim Knaak

Arno Döbbeler

Arno Doebbeler

Wolfgang Hörger

Wolfgang Hoerger

Kwok Tung Wong

A non-linear load in the form of an arc furnace with an upstream furnace transformer is supplied with electric power from a power supply device with a plurality of converter units. The converter units have a plurality of main modules with inputs connected to a respective phase of a three-phase grid. The converter units have a common star point between the main modules and the primary side of the furnace transformer. Each main module has a series circuit with a coupling inductance and a plurality of submodules. The submodules have a bridge circuit with four self-commutated semiconductor switches and a bridge path with a storage capacitor between input and output. The semiconductor switches of the submodules can each be switched independently of the semiconductor switches of the other submodules of the same main module and of the other main modules.

Power supply for a non-linear load with multilevel matrix converters

A power factor correction device for an AC voltage supply system includes a transformer which is interconnected, on the secondary side, to form a star point circuit and which has a secondary-side connection for each phase. A module series circuit with at least two switching modules, which are connected in series and each of which has at least four switches and a capacitor, is respectively connected between each of the secondary-side connections of the transformer and the star point of the star circuit. There is provided a transformer which is a high-leakage-reactance transformer.

Power factor correction device and method for operating a power factor correction device

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Fuerth, Germany

Jonas Pinkwart