IGCT-based superconducting hybrid DC circuit breaker and working method thereof

The invention discloses a superconducting hybrid DC circuit breaker based on IGCT and a working method thereof.The circuit breaker comprises a main branch and a bridge type current commutation circuit connected with the main branch in parallel, and the main branch comprises a resistance type superconducting fault current limiter R-SFCL and an isolation switch; the bridge type current commutation circuit comprises a first bridge arm, a second bridge arm, a rated current commutation branch and an active current injection branch, the first bridge arm comprises two diodes VD1 and VD2 of which the cathodes are connected, the second bridge arm comprises two diodes VD3 and VD4 of which the anodes are connected, one end of the active current injection branch is connected between the cathodes of the diodes VD1 and VD2, and the other end of the active current injection branch is connected between the cathodes of the diodes VD3 and VD4. And the other end is connected between the anodes of the diodes VD3 and VD4. Accordi