Capacitor Commutation Method for MVDC Hybrid Circuit Breakers

Capacitor Commutation Method for MVDC Hybrid Circuit Breakers

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The medium voltage DC (MVDC) type system can connect multiple terminals to a common MVDC bus, so AMERICAN GINSENG TINCTURE it is possible to connect several renewable DC power sources to the common MVDC bus, but a DC circuit breaker is needed to isolate short circuit accidents that may occur in the MVDC bus.For this purpose, the concept of a hybrid DC circuit breaker that takes advantage of a low conduction loss contact type switch and an arcless-breaking semiconductor switch has been proposed.During break the hybrid switch, a dedicated current commutation device is required to temporarily bypass the load current flowing through the main switch into a semiconductor switch branch.Existing current commutation methods include a proactive method and a reverse current injection method by a LC (Inductor-capacitor) resonant Missouri Star Souvenir Fabric circuit.This paper proposes a power circuit of a new MVDC hybrid circuit breaker using a low withstanding voltage capacitor branch for commutation and a sequence controller according to it, and verifies its operation through an experiment.