Fault behaviour of bipolar overhead line based HVDC grids

This paper provides a fault analysis of bipolar overhead line based HVDC grids using HB-MMC converters. The impacts of fault type and fault resistance are shown and the physical behaviour of the transient fault return current is explained. A transformation in modal quantities enables a decoupling of the measured phase currents and voltages. The results are presented in a point-to-point HVDC grid for both phase and modal quantities. It is shown that fault analysis in the modal domain is an auspicious method for fault detection and faulty line discrimination.

Keywords: Bipolar grid, Overhead line, Fault analysis, Modal domain, HVDC.

P. Torwelle#, A. Bertinato#, B. Raison#*, T.D. Le#†, M. Petit#†

#SuperGrid Institute, Villeurbanne, France, pascal.torwelle@supergrid-institute.com
*Univ. Grenoble Alpes, CNRS, Grenoble INP*, G2Elab, F-38000 Grenoble, France
†CentraleSupelec, CNRS, GeePs, F-91192 Gif sur Yvette, France

Conference: IET ACDC 2019 conference