An electric power system for supplying electric energy to a vessel

Abstract

An electric power system for supplying direct voltage from shore-side to a vessel (120) comprises a transformer (101) whose primary side is connectable to a shore-side alternating voltage network (130), a diode or thyristor rectifier (102) whose alternating voltage terminals are connected to a secondary side of the transformer, electric connectors (103) for connecting to the vessel, and a direct voltage link (104) for transferring the direct voltage from direct voltage terminals of the rectifier to the electric connectors The transformer comprises an on-load tap-changer (105) for changing a transformation ratio. The electric power system comprises a controller (106) for controlling the on-load tap-changer to control the direct voltage supplied to the vessel. Natural switching of rectifier diodes or thyristors does not induce potentially harmful high-frequency common mode voltages and currents. Furthermore, the number of power conversions is minimized, which provides an energy efficient power transfer.

Dependencies are inferred from the claim text.