An energy distribution system is provided that includes a first AC bus; a second AC bus for connecting to at least one second AC load; a third AC bus for connecting to a supply network; a transformer that converts an alternating voltage of each of the first to third AC buses into an alternating voltage of each of the other of the first to third AC buses; a DC bus; an energy storage device connected to the DC bus; and a bidirectional AC-DC power converter that is connected between the first AC bus and the DC bus.

Provided is a power generation facility used in a power transmission system that charges a storage battery mounted on a moving body with power generated by the power generation facility; and feeds power from the storage battery transported by the moving body to a power receiving facility. The power generation facility includes: a power generator; and a converter that converts alternating-current power generated by the power generator to direct-current power. The power generation facility is configured to transmit the direct-current power to an outside of the facility using a cable.

Provided is a moving body used in a power transmission system that charges a storage battery mounted on the moving body with power generated by a power generation facility and feeds the power to a power receiving facility from the storage battery transported by the moving body. This moving body is provided with a battery control device that causes the storage battery to be charged with the supply of power based on a voltage value that does not reach a maximum voltage value of direct-current power between the power generation facility and the power receiving facility.

Methods for switching the power source supplying an alternating current (AC) electrical load from a first AC power supply to a second AC power supply comprising: (a) determining, during a time period, the zero voltage crossings of at the first and second AC power supplies; (b) estimating for a future time period, based on information obtained in said determining step (a), the times at which a series of future current zero-crossings of said AC load and at least the current zero-crossing of the second power supply; (c) based on said estimating step (b), determining whether during said future time period the time of said zero-crossing of said load current and the zero-crossing of the second power supply are within about 0.1 microseconds of each other; and (d) for a time period during which said zero crossings are estimated to be within 0.1 microseconds of each other, switching said load to said second power supply at said time at which said zero crossings are estimated to be within 0.1 microseconds of each other, wherein said switching: (i) uses a solid-state switching system and microprocessor-based control system for actuating said solid-state switching circuit; and (ii) accounts for any known actuation delay between the actuation signal from said microprocessor and the occurrence of said switching.

The present disclosure provides a marine starter battery management system and a method for monitoring its low-temperature charging and discharging. The system comprises a battery management unit, a heating circuit, a high-current charge/discharge drive circuit, a passive balancing circuit, a voltage spike suppression circuit, a soft-start circuit, and a processing unit. The processing unit is electrically connected to these components. Based on battery state parameters, the processing unit controls in real-time the operating states and sequences of the heating circuit, the high-current drive circuit, the passive balancing circuit, the voltage spike suppression circuit, and the soft-start circuit. This intelligent, coordinated control of the various functional modules improves the safety, reliability, and performance of the marine starter battery, particularly in demanding low-temperature environments.

A waterproof marine power supply system is provided. The system includes an enclosure defining an interior region and including an upper wall and a lower wall, a first peripheral wall and a second peripheral wall, and a convection passage wall extending within the interior region and separating a convection passage from a component space, where the convection passage extends from a first end to a second end of the enclosure. The component space houses power supply components. The system further includes a first end cap, a second end cap, and a fan coupled to either the first end cap or the second end cap and configured to force a flow of air through the convection passage. The first end cap and the second end cap are coupled to the enclosure such that the component space is sealed against water intrusion and the convection passage is not sealed against water intrusion.

The disclosure relates to a power source assembly for powering high current low impedance devices from an Autonomous Underwater Vehicle, AUV, battery pack and/or auxiliary battery packs, comprising: one or more high current low impedance devices, a high current power source, wherein the high current low impedance device is powered by the high current power source, one or more AUVs, the one or more AUVs comprising an AUV and/or auxiliary battery pack, and the high current power sources, the high current low impedance device further comprising a high current supply module comprising an electronic circuit adapted to: supply a current from the AUV battery pack or AUV and/or auxiliary battery pack, store the supplied power in the high current power source, and supply high current to a connected high current output device. The disclosure further relates to a method for maintaining the power source assembly and a system for a powering the high current low impedance devices.