Universal Design Methodology for Multiline Hybrid HVDC Circuit Breakers Based on Generalized Circuit Topology

We propose a universal design methodology for multiline hybrid high-voltage dc circuit breakers (MHCBs) based on a generalized circuit topology. MHCB is a dc circuit breaker topology that shares a solid-state circuit breaker between dc transmission lines. Various types of MHCB configuration have been proposed. However, those circuit designs have not been based on any sort of regularity or generality. They were inefficient for the study of MHCBs. We found regularities in the MHCBs and propose a generalized circuit of them. It reveals that there are five possible fundamental topologies of the MHCB. Most of the MHCBs previously proposed can be derived from the generalized circuit and can be classified into the five topologies. The derivation process and the detailed characteristics of the fundamental topologies are discussed and clarified. The generalized circuit contributes to the universal design methodology for MHCBs. It allows for easy derivation of new MHCB configurations and their modification.