Experimental Verification of an Auto-reclosing Concept for VSC-HVDC Systems with Fault Current Controllability

Conference: VDE-Hochspannungstechnik 2018 - ETG-Fachtagung
11/12/2018 - 11/14/2018 at Berlin, Deutschland

Proceedings: ETG-Fb. 157: VDE-Hochspannungstechnik

Pages: 6Language: englishTyp: PDF

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Authors:
Stumpe, Maximilian; Schumann, Sven; Schnettler, Armin (Institute for High Voltage Technology, RWTH Aachen University, Germany)
Honerla, Joerg; Hammerschlag-Buettner, Peter; Hirsch, Holger (Institute of Electrical Power Transmission, University Duisburg Essen, Germany)

Abstract:
HVDC interconnectors represent a promising solution to address present challenges within the context of the transition towards a renewable power supply. Since parts of these systems are going to be realized as overhead lines, autoreclosing concepts are necessary to handle transient faults caused by atmospheric impacts. The interruption time has to be chosen as short as possible to ensure the stability of both AC and DC grids. This paper develops an auto-reclosing concept for VSC-HVDC systems with fault current controllability based on the physical limits of the dielectric recovery of the air insulation path after arcing faults. Numerical computational fluid dynamics simulations are carried out to analyze the energy input of exemplary arcing faults. Meanwhile the dielectric recovery during the cooling is determined with a transient leader discharge model. The models are validated by experiments in high voltage and high power labs. The dielectric recovery to the full voltage strength is completed 450 ms after fault clearance, but the grid voltage can already be isolated in less than 300 ms. Finally an envelope for the voltage recovery is determined which can be applied to every HVDC system.