Short Circuit Analysis and Selective Protection of Ship DC Power System

Ship DC power system, which is a kind of common DC bus system based on multiple VSCs, has been more and more popular because of its high efficiency. However, this common DC bus system can hardly balance the fast and selective protection requirements, especially in low-voltage high-capacity situations, which should be extensively protected by quick- fuses. In view of this kind of system, this paper analyses the short-circuit current calculation method of various faults and calculates a typical ship study example by transient simulations. On the basis of short-circuit calculation, the parameters of the fuses are designed based on fast and selective protection principles. At last, the real-ship multi-working condition short-circuit tests are carried out to verify the protection theory.