Abstract
This paper investigates the application of unidirectional DC circuit breakers namely current releasing DC circuit breaker in protection of multi-terminal HVDC grids. The design procedure is extended for multi-terminal HVDC grid. Furthermore, a newly proposed fast non-unit protection algorithm is adopted for unidirectional protection of multiterminal grid. The results of this study confirm that unidirectional DC circuit breakers can protect DC grids similar to the bidirectional DC circuit breakers.
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