To address the issues in complex modular multilevel converter (MMC)-based DC distribution systems

specifically

converter blocking caused by fault current surges and post-fault power flow overload in non-faulted lines

this paper proposes a fault ride-through and recovery scheme based on a current limiting power flow controller. First

the topological structure and operational principles of the current limiting power flow controller are analyzed. Second

from the perspective of collaborative current limiting between the source side and the network side

a non-blocking fault ride-through scheme for MMC is proposed. This approach ensures selective fault clearance while providing adequate time margin for fault identification. After fault clearance

the scheme enables rapid power balance via adaptive power flow control

effectively meeting the supply demands of multiple feeders. Finally

a complex ring-type flexible DC distribution network model is established in PSCAD/EMTDC for simulation analysis. The results verify that the proposed scheme offers excellent fault ride-through capability and meets both practicality and scalability requirements.