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In this paper, we are comparing fuel consumption on a case study hybrid marine power plant with diesel gensets and batteries. Optimization methods are used to find an optimal operating point for the gensets, under different power demands, with regards to fuel consumption and NOx emissions. Three different power system example configurations for an offshore construction vessel are explored in this study, and the simulations are carried out to compare the resulting fuel consumption and NOx emissions for these power system configurations. Nomenclature DP Dynamic positioning ESS Energy storage system FC Fuel consumption Genset Generator set MCR Maximum continuous rating OCV Offshore construction vessel ROV Remote operated vehicle SFC Specific fuel consumption ∗Address all correspondence to this author. INTRODUCTION In the last century, diesel-electric propulsion systems have been installed on many vessels such as supply vessels, drilling ships, icebreakers, and other offshore installations. In dieselelectric propulsion systems, the engine is first connected to a generator that supplies a power distribution network and drives the electric motors. Electric propulsion has become a prevailing trend mainly due to increased demands for energy-efficient and low emission vessels with high availability and reliability. A vessel with diesel-electric propulsion often has between 2 to 10 pairs of diesel engines and generators. The gensets can be started and stopped as required in a configuration where there are more than two gensets, while at the same time keeping redundancy [1, 2]. Due to operation cost and environmental concerns, there is ongoing effort to reduce the fuel consumption and emissions in all transportation sectors including marine transportation [3]. It is usually desired to operate the engine at a loading rate between 60% and 80% to achieve the lowest fuel consumption per kilowatt produced. However, operating condition can vary a lot so that the engines are not always operated within such load range. When there exist varying load conditions, configuring the power system with many low-power marine engine sets is beneficial, due to the fact that higher loading percentage per engine can then be achieved by shutting down unnecessary ones while at the same time keeping redundancy. Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering OMAE2018 June 17-22, 2018, Madrid, Spain

Comparison of Fuel Consumption on a Hybrid Marine Power Plant With Low-Power Versus High-Power Engines