As the capacity of DC system increasing

it puts forward higher requirements on the DC circuit breakers (DCCB)

which may lead to high investment costs. The fixed reactor is widely used in current limiting

but it has difficulty on the balance of high dynamic response and deep current suppression

then fault current limiter (FCL) becomes a feasible solution. This paper proposes a coupled-inductor FCL (CFCL) with self-bypassing capability. The CFCL can switch on/off its IGBTs for high dynamic response or current suppression

then bypassed to help reduce DCCB energy consumption. The topology

working principle and parameter design of CFCL are analyzed. PSCAD/EMTDC simulations and experiments are conducted to verify the feasibility of the scheme which indicate that CFCL can reduce peak fault current by 30% and improve system dynamic response speed. Compared with existing FCLs

CFCL has lower cost and better current limiting effect.