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A optimal algorithm for DC breakers configuration in multi-terminal DC systems

When the multi-terminal DC system fails, the fault current is hard to isolate, which poses a challenge to DC fault protection. The hybrid DC circuit breaker has a good effect on isolating the DC current, but the DC breaker is not economical when each line equip with DC breaker, and the circuit breaker has the risk of malfunction. Partition protection for multi-terminal DC systems and DC breaks configuration at regional boundaries is a planning scheme that takes into account the economics and reliability of DC construction. This paper proposes a traversal-based optimization algorithm to search the multi-terminal DC system partitioning scheme that meets the required conditions. The simulation scheme is verified in PSCAD platform. The simulation results show that the partitioning scheme can isolate the DC fault within its own area and ensure the economical and reliability of the DC partition.