Oil Field Flexible DC Distribution System Transient Overcurrent and Overvoltage Simulation and Rapid Fault Removal Technology

DC circuit breaker is key equipment for the safe operation and protection of DC distribution network. In this paper, the inter-electrode short-circuit fault and protection in DC distribution system of oil field were studied, and a control and protection scheme based on a new all-solid-state DC circuit breaker. Based on the oil field DC distribution system, the fault response mechanism of grid-connected converter in case of inter-electrode short-circuit fault was analyzed and verified by simulation. At the same time, the topological structure and working principles of the new all-solid circuit breaker were briefly described. On this basis, the protection scheme of the oil field DC distribution system was designed, and the simulation model was built on the PSCAD/EMTDC platform for simulation test. The results indicated that the proposed circuit breaker design and protection scheme were correct and effective.