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  • 1. Leterme, Willem
    et al.
    Jahn, Ilka
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Ruffing, Philipp
    Sharifabadi, Kamran
    Van Hertem, Dirk
    Designing for High-Voltage dc Grid Protection: Fault Clearing Strategies and Protection Algorithms2019In: IEEE Power and Energy Magazine, ISSN 1540-7977, E-ISSN 1558-4216, Vol. 17, no 3, p. 73-81Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Protecting High-Voltage (HV) dc grids requires a different approach compared with that of ac power system protection and poses one of the major challenges that must be resolved before the realization of large scale HVdc grids that use equipment from multiple vendors. HVdc grid protection, which is essential for safe and reliable HVdc grid operation, entails the appropriate detection and fault clearing of dc-side short circuit faults (i.e., dc faults). In this context, fault clearing refers to interrupting the dc fault current and isolating the faulted component. Fault current interruption is much more complex in HVdc grids compared to ac systems because dc fault currents have no naturally recurring zero crossings and, without countermeasures, quickly increase to values that are unacceptable for power electronic components. Conversely, the technologies used within HVdc grids offer options for fault clearing beyond the well-known approach of using circuit breakers in existing ac systems.

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