Simulation study of integrated‐gate‐commutated‐thyristor based superconducting hybrid direct current circuit breaker

With the development of a distributed generation, direct current (DC) load and energy-storage equipment, voltage-source-converter-based medium-voltage DC systems (VSC-MVDC) have attracted more attention due to its low power consumption, high reliability, independent control so on. However, VSC-MVDC has problem fault isolation, which requires fast-acting circuit-breakers isolate faulty lines ensure cost. This can be solved by coordinating resistive type superconducting-fault-current-limiter (R-SFCL) integrated-gate-commutated-thyristor (IGCT) based hybrid circuit breaker. Based on this, IGCT superconducting breaker (SDCCB) is proposed analysed. Combining R-SFCL with could realise large limiting interruption In addition, (IGCT-HDCCB) compared traditional insulated gate bipolar transistor (IGBT) (IGBT-HDCCB) evaluate suitable for VSC-MVDC. The results show that, coordination SDCCB, successfully limited from 17.6 2.1 kA, then interrupted within 3.8 ms. IGCT-HDCCB overcomes disadvantage that less interrupting capacity than IGBT, retains advantage cost MVDC system.