Economic Fuel Dispatch of Diesel Generators in Offshore Support Vessels
In a typical offshore support vessel, a number of diesel generators are installed to supply its electrical demand. Specific fuel consumption (SFC) of a diesel unit changes nonlinearly with respect to its power generation. Hence, this paper presents an economic fuel dispatch strategy for multi-diesel units operated in offshore support vessels using the cubic spline interpolation curve fittings of the SFC-power nonlinear relations. A mixed-integer nonlinear programming problem is coded under generalized algebraic mathematical modeling system (GAMS) and solved using branch-and-reduce optimization navigator tool to minimize the hour-ahead specific fuel consumption of the diesel-electric propulsion system. The upper and lower bounds of the power generation within each non-linear operating interval as well as the load-generation balance constraint are involved in simulations. The hourly power generation and the specific fuel consumption of each diesel generator are selected as positive decision variables. Equal and unequal power generation capacities are considered for four and six diesel units in two case studies. Numerical results demonstrated that GAMS is able to find better and more effective solutions than genetic algorithm and particle swarm optimization method in lower calculation time and less computational burden.
 Thomson, H., J.J. Corbett, and J.J. Winebrake, “Natural gas as a marine fuel”, Energy Policy, Vol. 87, 2015, pp. 153-167.
 Khair, M.K. and W.A. Majewski, “Diesel emissions and their control”. SAE Technical Paper, 2006.
 Hansen, J.F., A.K. Ådnanes, and T.I. Fossen, “Mathematical modelling of diesel-electric propulsion systems for marine vessels”, Mathematical and Computer Modelling of Dynamical Systems, Vol. 7, No. 3, 2001, pp. 323-355.
 Solem, S., et al., “Optimization of diesel electric machinery system configuration in conceptual ship design”, Journal of Marine Science and Technology, Vol. 20, No. 3, 2015, pp. 406-416.
 Lundh, M., et al., “Estimation and optimization of vessel fuel consumption”, IFAC-PapersOnLine, Vol. 49, No. 23, 2016, pp. 394-399.
 Zhang, G.-c. “Marine power management system based on model free adaptive control”. in 2010 International Conference on Computer Application and System Modeling (ICCASM 2010), IEEE, 2010.
 Tadros, M., M. Ventura, and C.G. Soares, “Optimization procedure to minimize fuel consumption of a four-stroke marine turbocharged diesel engine”, Energy, vol. 168, 2019, pp. 897-908.
 Rao, K.S., et al. “Optimal scheduling of diesel generators in offshore support vessels to minimize fuel consumption”, in IECON 2015-41st Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2015.
 Chauhan, P.J., et al. “Fuel efficiency improvement by optimal scheduling of diesel generators using PSO in offshore support vessel with DC power system architecture”, in 2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC), IEEE, 2015.