A Novel DC Microgrid-Based Power System for Hybrid Propulsion of Commercial Marine Vessels

Abstract

This article showcases successful applications of a novel hybrid propulsion system for marine vessels based on the principles of decentralized dc microgrid. The article discusses the integration of different dc sources [batteries and hydrogen fuel cells (FCs)], ac sources (diesel-generator set), and electric loads. It proposes a power sharing mechanism based solely on current measurement, without telecommunication or droop. This article provides in-depth theoretical development of the proposed concept and its extensions. Using a representative scenario that includes several modes of operation, this article demonstrates how, using the proposed mechanism, power flows from different sources are coordinated without centralized control or operator interference. This article discusses practical application aspects and validates the proposed ideas by experimental results obtained for a 22-ft pilot prototype and a 43-ft commercial prototype marine vessel.