Abb Research Ltd.

Abb Technology Ag

Abb Schweiz Ag

Erik Koldby

Gunnar Asplund

Lars Gertmar

Jouko Niiranen

Hans Christian Christensen

Leif-Erik Wraae

Hakan Korske, Legal Representative

A plant for transmitting electric power through HVDC includes two converter stations interconnected by a monopolar direct voltage network and each having an alternating voltage side for feeding electric power from one of said alternating voltage sides to the other. Each station has a line commutated converter. The plant is upgraded by making the direct voltage network bipolar, providing each station with a Voltage Source Converter and providing two switches for both line commutated converters or both Voltage Source Converters and a device configured to control said four switches.

Method of upgrading a plant for transmitting electric power and such a plant

A power converter arrangement for connecting an induction generator to an electric power network comprises a first path provided for transferring electric power from the induction generator to the electric power network during a first operation condition, and a second path provided for transferring electric power from the induction generator to the electric power network during a second operation condition, where the first path includes an AC-AC converter and the second path includes a switch. A capacitor arrangement is interconnected between the induction generator and the first and second paths and a first AC reactor device is interconnected between the capacitor arrangement and the first and second paths, where the capacitor arrangement is provided for compensating for a magnetization current of the induction generator.

Power converter arrangement and method

Growing community of inventors

Odense, Denmark

Erik Koldby