A Novel Model of HVDC Hybrid-Type Superconducting Circuit Breaker and Its Performance Analysis for Limiting and Breaking DC Fault Currents


The key obstacle in integrating high-voltage direct current (HVDC) point-to-purpose networks into meshed multiterminal HVDC networks (MTDC) is the absence of dc circuit breakers (DCCBs), which can timely and reliably isolate the faulty HVDC network from the MTDC. In this paper, a unique hybrid-kind superconducting DCCB model (SDCCB) is proposed. The SDCCB contains a superconducting fault current limiter (SFCL) located in the main line, to limit the fault current until the ultimate trip signal to the SDCCB is given. Once the trip signal, insulated-gate bipolar transistor (IGBT) switches located in the most line can commutate the fault current into a parallel line, where dc current is forced to zero by combination of IGBTs and surge arresters. DC fault current behavior in MTDC and fundamental requirements of DCCB for MTDC were described, followed by an rationalization of the operating principles of the SDCCB. To prove the viability of the SDCCB, a simulation analysis demonstrating SDCCB current interruption performance was in hot water changing the intensity of dc fault current. It was observed that the passive current limiting by SFCL caused important reduction in fault current interruption stress for SDCCB. Furthermore, fundamental style requirements for SFCL, as well as the impact of SFCL quenching impedance on SFCL voltage rating and energy dissipation capability, were investigated. Finally, benefits and limitations of the SDCCB were highlighted.

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