Dynamic AC-side active and reactive power management of an MMCbased system in case of DC-side short circuit

Konferenz: NEIS 2017 - Conference on Sustainable Energy Supply and Energy Storage Systems
21.09.2017 - 22.09.2017 in Hamburg, Deutschland

Tagungsband: NEIS 2017

Seiten: 7Sprache: EnglischTyp: PDF

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Stoetzel, Thomas; Staudt, Volker (EneSys, Ruhr-University Bochum, Bochum, Germany)
Heising, Carsten (Avasition GmbH, Dortmund, Germany)

High-voltage DC (HVDC) transmission lines offer highly efficient transport of electric energy. If applied to comparatively weak grids, self-commutated converters are the proper choice, because they allow to stabilize the grid in case of faults by injecting reactive power. At high voltages of e.g. 400 kV modular multilevel converters (MMC) based on full-bridge modules provide the needed functionality. For testing all relevant aspects of a multiterminal HVDC transmission system a scaled-down test bench has been realized. The associated real-life system “Ultranet” will use overhead lines. Weatherinduced faults (lightning, conductor bouncing und strong wind) are expected and have to be mastered by the converter stations. This paper first introduces the system and the associated test bench and then presents the dynamic AC-side power management in case of DC-side short circuit conditions.