In view of insufficient degrees of freedom， large number of DC circuit breakers and high cost in multi-branch DC power grid， this paper presents an economic multi-port DC circuit breaker with power flow regulation and fault blocking functions. Compared with other similar topologies， it can reduce the number and loss of devices. Based on the working characteristics and interaction of fault blocking and power flow control， the parameter design is optimized， and a power flow control mode with strong expansibility is proposed. Finally， the proposed topology scheme is compared with other similar topologies in detail to verify the economy of the topology. The feasibility of the topology is demonstrated by using Matlab/Simulink DC to build a four-terminal flexible DC transmission system.
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