Abstract: An arrangement for power distribution on a vessel, having: a first DC bus operating at a first medium voltage; at least one second DC bus operating at a second medium voltage and having no direct connection with the first DC bus; a first AC bus operating at a low voltage; a first inverter coupled between the first DC bus and the first AC bus for allowing power flow from the first DC bus to the first AC bus in a first operation mode; a second AC bus operating at the low voltage; a second inverter coupled between the second DC bus and the second AC bus for allowing power flow from the second DC bus to the second AC bus in the first operation mode; a low voltage connection system for selectively connecting or disconnecting the first AC bus and the second AC bus.

Abstract: A vessel energy management system for controlling power supply to and from a propulsion system of a vessel. The energy management system has a motor-generator unit adapted to receive power from a prime mover of the vessel, a frequency converter, an energy storage unit, and a controller. According to different embodiments, the energy storage unit includes one or more capacitors, super capacitors or ultra capacitors. The controller determines an instantaneous power requirement of the propulsion system and an average power generated by the prime mover. A comparator compares the instantaneous required power and average power. If the instantaneous required power exceeds the average power, the motor-generator unit receives energy from the energy storage unit. If the instantaneous required power is less than the average power, the motor-generator unit supplies power from the prime mover to the energy storage unit.

Abstract: A vessel energy management system for controlling power supply to and from a propulsion system of a vessel, the energy management system has a motor/generator unit adapted to receive power from a prime mover of the vessel; a frequency converter; an energy storage unit and a controller. The energy storage unit includes one or more capacitors, super capacitors or ultra capacitors. The controller of the energy management system determines an instantaneous power requirement of the propulsion system and average power generated by the prime mover; and a comparator compares the instantaneous required power and average power. If the instantaneous required power exceeds the average power, the motor/generator unit receives energy from the energy storage unit; and, if the instantaneous required power is less than the average power, the motor/generator unit supplies power from the prime mover to the energy storage unit.

Abstract: An arrangement for power distribution on a vessel, having: a first DC bus operating at a first medium voltage; at least one second DC bus operating at a second medium voltage and having no direct connection with the first DC bus; a first AC bus operating at a low voltage; a first inverter coupled between the first DC bus and the first AC bus for allowing power flow from the first DC bus to the first AC bus in a first operation mode; a second AC bus operating at the low voltage; a second inverter coupled between the second DC bus and the second AC bus for allowing power flow from the second DC bus to the second AC bus in the first operation mode; a low voltage connection system for selectively connecting or disconnecting the first AC bus and the second AC bus.

Abstract: A power supply system for a marine drilling vessel is provided. The power supply system comprises a first power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered active heave compensator. The heave compensator is configured to raise and lower a drill string relative to the marine drilling vessel. The power supply system further comprises a second power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered thruster drive of the marine drilling vessel. The first power grid section is electrically coupled to the second power grid section.

Abstract: A power supply system for a marine drilling vessel is provided. The power supply system comprises a first power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered active heave compensator. The heave compensator is configured to raise and lower a drill string relative to the marine drilling vessel. The power supply system further comprises a second power grid section coupled to a generator configured to generate electric power and further coupled to an electrically powered thruster drive of the marine drilling vessel. The first power grid section is electrically coupled to the second power grid section.