Abstract
In this article, the protection design in a shipboard power system (SPS) with DC common bus distribution is evaluated. The goal is to compare two different approaches to calculate DC short-circuit currents and their outcoming influence in verifying the sensitivity of high-speed fuses. A dual-circuit modeling analysis is proposed for EMTP-ATP time-domain simulation: lumped RLC, and distributed parameters combined with non-linear inductances and frequency-dependent elements; and the calculation procedures proposed by IEC 61660–1. An adequate study case is introduced considering a small innovative vessel powered by fuel cells and batteries with DC architecture for the electrical propulsion plant. The fault study is carried out considering the ship operations at Harbour with the minimum available power source. Finally, this paper highlights the benefits or limitations of the two DC fault methodologies and analyses their suitability for feeder protection designing with high-speed fuses in the DC SPS.
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