Sirus Silatan - Faculty of Marine Science, Petroleum University of Technology;
Pedram Edalat - Faculty of Marine Science, Petroleum University of Technology;
Mohammad Rahimi - Faculty of Marine Engineering, Amirkabir University of Technology;

Because of reduced fuel consumption, increasing of the fuel costs and growing of the environmental concerns, reduced environmental pollution and increase in life of a vessel’s propulsion system, led energy consumption to become one of the most important subjects of the modern and developed countries and Hybrid system has been applied on vessels. Use of two or more energy sources is the main property of a hybrid system. Different combinations of Internal Combustion Engines (ICE), Steam Turbine (ST), Gas Turbine (GT), fuel piles with Electric Motor (EM) can be used for different transportation vehicles. A hybrid vessel system can be either combination of DE and EM or GT and EM. So each one of CODLOD/ CODLAD/ CODLOG/ or CODLAG systems can be called a hybrid system. A frigate (as a vessel) needs different speeds in different positions, cases and situations. Every situation needs different modes for a vessel. So the typical hybrid operation modes (PTI booster mode, Generator mode (or PTO-mode), Electrical mode and Electrical cross-connection mode (Electric Shaft) will be introduced

Hybrid system, CODLOD, CODLAD, CODLOG, CODLAG