Hybrid combined cycle power system

A vessel hybrid combined cycle power and propulsion system, the system comprising a steam turbine, at least one gas turbine, at least one auxiliary generator;

• an electric propulsion drive system and an energy storage system, each connected to a section of an AC bus;
• the system further comprising a source of steam for the steam turbine, and a control system for controlling operation of the steam turbine, gas turbine, auxiliary generators, electric drive propulsion system and energy storage system;
• wherein the primary source of steam for the steam turbine is exhaust gas from the gas turbine;
• the primary source of gas for the gas turbine is boil off gas from the cargo hold;
• wherein the AC bus comprises a plurality of sections of AC bus coupled together by bus ties closed in normal operation forming a closed ring AC bus;
• and the electric propulsion drive system comprises a variable speed drive, driving an electric motor coupled through a drive shaft to a propeller.