Energy Management of a Hybrid Electric Propulsion System in an Typical Operational Vessel to Improve Load Following

Today, electrical systems, given the many advantages, have been used in propulsion and power production for typical operational vessels. In renewable electrical propulsion systems that play a significant role in reducing environmental pollutants, resources such as fuel cells, capacitors, and batteries are used. Managing the power production of these resources is one of the most important measures for proper propulsion and other loads following. In the proposed energy management strategy, with respect to the energy and power density of these resources and their response rate, the rapid changes are covered by the capacitor and the steady state energy is produced by the battery and fuel cell. For this purpose, an electrical system consisting of sources, converters, real propulsion load and hotel load is designed for a typical operational vessels, then according to the introduced energy management strategy, the system load following is evaluated. The results indicate the efficiency of the electrical system and the proposed energy management strategy. Also, in controlling the battery state of charge (SOC), the method presented in this paper is better than the two methods compared with them.