A system for controlling and providing power to at least one electric motor in a vessel, such as a motor in a thruster or a winch. The system includes an electric energy storage, a power controller device connected to the electric energy storage, at least one motor controller device, a first combined power and communication line interconnecting the power controller device and the at least one motor controller device, an electric motor connected to the motor controller device, and at least one operating device connected to the power controller device. The system may further include a second combined power and communication line that interconnects the power controller device and the at least one operating device. The first combined power and communication line operates with a DC voltage level which is at least twice the operational DC voltage level of the second power and communication line.

A system for controlling and providing power to at least one electric motor in a vessel, such as a motor in a thruster or a winch. The system includes an electric energy storage, a power controller device connected to the electric energy storage, at least one motor controller device, a first combined power and communication line interconnecting the power controller device and the at least one motor controller device, an electric motor connected to the motor controller device, and at least one operating device connected to the power controller device. The system may further include a second combined power and communication line that interconnects the power controller device and the at least one operating device. The first combined power and communication line operates with a DC voltage level which is at least twice the operational DC voltage level of the second power and communication line.

This disclosure provides improved nautical craft that can travel and navigate on their own. A hybrid vessel is described that converts wave motion to locomotive thrust by mechanical means, and also converts wave motion to electrical power for storage in a battery. The electrical power can then be tapped to provide locomotive power during periods where wave motion is inadequate and during deployment. The electrical power can also be tapped to even out the undulating thrust that is created when locomotion of the vessel is powered by wave motion alone.

An electric drive shaft is disclosed including at least one speed-variable generator for generating a voltage with a variable amplitude and a variable frequency, and at least one speed-variable drive motor supplied with the voltage. The drive shaft enables repercussions on the voltage during sudden load changes, and therefore the complexity of the regulation for stabilizing the voltage, to be reduced due to the generator including a supraconductor winding, especially a high-temperature supraconductor winding.

An electric drive shaft is disclosed including at least one speed-variable generator for generating a voltage with a variable amplitude and a variable frequency, and at least one speed-variable drive motor supplied with the voltage. The drive shaft enables repercussions on the voltage during sudden load changes, and therefore the complexity of the regulation for stabilizing the voltage, to be reduced due to the generator including a supraconductor winding, especially a high-temperature supraconductor winding.

A waste heat recovery system for a vessel for supplying to a plurality of scroll expanders which are connected in parallel to one another, steam generated by a heat exchanger using waste heat from a main machine as a heat source, may include gate valves corresponding to respective scroll expanders and an electronic controller which controls the number of the scroll expanders which drives based on flow volume of the steam by opening or closing of the gate valves.

A waste heat recovery system for a vessel for supplying to a plurality of scroll expanders which are connected in parallel to one another, steam generated by a heat exchanger using waste heat from a main machine as a heat source, may include gate valves corresponding to respective scroll expanders and an electronic controller which controls the number of the scroll expanders which drives based on flow volume of the steam by opening or closing of the gate valves.

A vessel hybrid combined cycle power and propulsion system includes a steam turbine, a gas turbine, an auxiliary generator, an electric propulsion drive system, and an energy storage system, each connected to an AC bus. The system further includes a source of steam for the steam turbine, a control system for controlling operation of the steam turbine, gas turbine, auxiliary generators, electric drive propulsion system and energy storage system. 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. The AC bus includes a plurality of sections of AC bus coupled together by bus ties closed in normal operation forming a closed ring AC bus. The electric propulsion drive system includes a variable speed drive, driving an electric motor coupled through a drive shaft to a propeller.

A vessel hybrid combined cycle power and propulsion system includes a steam turbine, a gas turbine, an auxiliary generator, an electric propulsion drive system, and an energy storage system, each connected to an AC bus. The system further includes a source of steam for the steam turbine, a control system for controlling operation of the steam turbine, gas turbine, auxiliary generators, electric drive propulsion system and energy storage system. 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. The AC bus includes a plurality of sections of AC bus coupled together by bus ties closed in normal operation forming a closed ring AC bus. The electric propulsion drive system includes a variable speed drive, driving an electric motor coupled through a drive shaft to a propeller.

A ship drive system includes a first and one second drive shaft for driving a respective propulsion unit, wherein each of the electric drive shafts includes at least one speed-variable generator driven by an internal combustion engine for generating a motor voltage having a variable amplitude and variable frequency, and at least one speed-variable drive motor that is supplied with the voltage and coupled to the propulsion unit. The first and second drive shafts can be switched from a first operating state, in which they are electrically disconnected from each other, to a second operating state, in which they are electrically coupled to each other such energy can be transmitted from the at least one generator of the one drive shaft to the at least one drive motor of the other drive shaft. To this end, the at least one generator includes a superconductor winding.