A watercraft comprising a compressed air propulsion system is shown and described. The watercraft includes at least one propeller operatively connected to an air motor. Storage tanks supply compressed air having a pressure of at least 2000 psi to a pressure regulator that reduces the pressure and supplies air to an air control valve. User controls adjust the air control valve to adjust the flow rate of air to the air motor which in turn adjusts the direction and/or speed of rotation of the propeller. An on-board air compressor energized by a plurality of lithium iron phosphate batteries provides air to the air storage tanks when the pressure falls below a specified value. In certain examples, the electric and air propulsion system is used to replace a fossil fuel engine in an existing watercraft and can remain at sea longer than the existing watercraft.

A navigation method for a ship which includes: a plurality of main generators that feed power to navigation equipment used in normal navigation and appliances for the living quarters provided within a ship body; and an emergency generator that feeds power to emergency equipment in case of fire or flood. The navigation method includes: an emergency power feeding step for feeding power to the emergency equipment using the emergency generator when at least one of the plurality of main generators is disabled due to fire or flood; and a return-to-port power feeding step for feeding power to return-to-port equipment, required for navigation for returning to port, using the main generators and the emergency generator after the fire or flood has subsided.

A boat-mounted wind power assembly for powering devices of a boat includes a first shaft that is rotatably coupled to and extends vertically from a boat. A plurality of blades is coupled to and extends from the first shaft. A generator is operationally coupled to the first shaft. A rectifier is operationally coupled the generator. A battery, which is rechargeable, is operationally coupled to the rectifier. The battery is selectively couplable to devices of the boat. The blades are configured to convert kinetic energy of wind into rotation of the first shaft. The generator is positioned to convert rotation of the first shaft into unstable alternating current. The rectifier is positioned to convert the unstable alternating current from the generator to direct current so that the battery is charged by the generator. The battery is configured to supply direct current to power the devices of the boat.

A rotor for a permanent magnet machine includes first and second axially successive rotor sections each including permanent magnets generating magnetic field having a pole pitch. The rotor includes a first coupling system for connecting the first rotor section to a shaft and a second coupling system for connecting the second rotor section to the shaft or to the first rotor section. The second rotor section is rotatable with respect to the first rotor section by an angle corresponding to the pole pitch in response to releasing the second coupling system so as to set the stator flux-linkages generated by the first and second rotor sections to be substantially zeroes. Thereafter, the permanent magnets do not substantially induce voltages on the stator windings even if the rotor is rotating during for example an internal fault of stator windings.

A hybrid electrical and mechanical ship propulsion and electric power system, includes a first mechanical power plant configured to drive a first propeller via a first shaft. There is a second electrical power plant configured to drive a second propeller via a second shaft. The second electrical power plant includes HTS generators and a high temperature superconductor (HTS) motor interconnected to the second shaft. There is a first electrical network to which the HTS motor is connected in order to energize the HTS motor to drive the second propeller via the second shaft.

A propulsion system is described that includes an electrical bus, a generator configured to provide electrical power to the electrical bus, a plurality of propulsors configured to provide thrust by simultaneously being driven by the electrical power at the electrical bus, and a controller. The controller is configured to synchronize a rotational speed of an individual propulsor from the plurality of propulsors with a rotational speed of the generator after the individual propulsor has become unsynchronized with the rotational speed of the generator by controlling at least one of the rotational speed of the generator, nozzle area of the individual propulsor, or a pitch angle of the individual propulsor.

A power system having a plurality of gensets compares the instantaneous power consumption with a plurality of power consumption zone boundaries and classifies the power consumption into a selected zone. Each zone includes a corresponding base power value and a corresponding dynamic range value, which are apportioned among the plurality of gensets.

A submarine device includes a drive voltage generation unit, a detection unit, and a control unit. The drive voltage generation unit generates voltages for driving connected loads according to current flows. The detection unit detects whether or not each of the loads is connected to the submarine device. The control unit performs control such that currents flow or do not flow in the drive voltage generation unit according to a detection result of the detection unit. The drive voltage generation units are provided in association with the loads, respectively. Depending on a result detected by the detection unit as to whether or not each load is connected, the control unit performs control in such a way that the current flows or does not flow through each drive voltage generation unit associated with each load.

The present invention relates to a high voltage shore connection (HVSC) system (1) for connection of a vessel (1004) in port to electrical supply from the shore-side. The system (1) comprises a first intake (5004) comprising at least one first connecting element (3) and a second intake (5004) comprising at least one second connecting element (3), the second intake (5004) being in electrical connection with the first intake (5004). The least one first connecting element (3) and the at least one second connecting element (3) are connectable to a power supply element (4) for supplying onshore electricity. The system (1) further comprises a safety circuit element being in electrical connection with the first intake (5004) and the second intake (5004). The system (1) further comprises at least one protecting element (7) being connectable to the at least one first connecting element (3) or the at least one second connecting element (3), whichever connecting element (3, 3) not being connected to the power supply element (4). The at least one protecting element (7) comprises a safety loop being electrically connectable to the safety circuit element.

The present invention relates to a natural gas hydrate tank container loading system for transporting natural gas hydrate, and the present invention provides a natural gas hydrate tank container loading system which enables automated connection of an electric power line and a boil-off pipe, and may automatically connect an electric power line and automatically connect the pipe by simultaneously stacking respective natural gas hydrate tank containers, in order to solve problems of a transportation method using the existing natural gas hydrate tank containers in the related art in that an operation of connecting an electric power line to a refrigerator for minimizing the occurrence of boil-off gas and maintaining a phase equilibrium condition in the tank containers and an operation of connecting the pipe for discharging the boil-off gas need to be manually and individually performed for long-distance transportation of a large amount of natural gas hydrate by using a ship, which causes an inconvenience.