A natural commutation current topology of hybrid HVDC circuit breaker integrated with limiting fault current

Abstract The high‐voltage direct current (HVDC) power transmission short‐circuit fault protection is a big challenge, and it the main obstacle to promote HVDC multi‐terminal networks. A natural commutation topology (NCCT) of hybrid circuit breaker (DCCB) integrated with limiting proposed in this paper, which shares several obvious merits, such as lower peak current, shorter isolation time low turn‐off loss. contributions paper are made follows. (1). second‐order RLC novel NCCT utilized dramatically reduce rising slope its value. (2) asynchronous has been investigated broaden breaker's optimal working area. (3) By taking China Zhangbei 500 kV four‐terminal DC grid an example, optimization design technique NCCT‐DCCB developed demonstrate process theoretical analysis parameter design. correctness feasibility confirmed by EMT simulation on PSCAD/EMTDC hardware‐in‐loop experiment PLECS‐RtBox.