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This paper presents a protection scheme for multi-terminal Voltage Source Converter (VSC)-based HVDC systems, designed to detect and clear cable-to-ground faults in a range from very low to relatively high impedance. The protection scheme consists of two complementary and integrated layers: a protection layer for low impedance faults without communication between the terminals and a slower layer for...
The realization of multi-terminal HVDC grids requires availability of adequate fault handling methods. This includes techniques for fault detection and location, and dc-breakers for faults clearing. The characteristics and consequences of dc-side faults are very different compared to ac-system faults, and conventional ac-protection methods are not necessarily suited in HVDC grids. This paper presents...
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