Vessel Heading Control System in Floating Offshore Plant

摘要

The present invention relates to a vessel heading control system in a floating offshore plant, which controls the bow of the hull of the floating offshore plant to be constantly directed in a direction based on a turret when an LNG carrier comes alongside the floating offshore plant to unload cargo. The vessel heading control system in the floating offshore plant comprises: an instruction unit which provides a general instruction signal and data for automatic or manual control of a heading direction of the hull so that the heading direction of the hull can be kept constant; a direction determination unit which determines a heading direction of the hull if the heading direction of the hull is automatically controlled depending on the instruction signal of the instruction unit, and applies information on the determined heading direction to a direction control unit; the direction control unit which outputs a control signal for automatic control of a variable thruster installed on the stem side based on the information on the heading direction applied by the direction determination unit; and a speed-variable driving unit which drives a motor by applying variable frequency AC power to the motor, which is provided for driving the variable thruster according to the control signal output by the direction control unit, and thus drives the variable thruster. According to the present invention, the vessel heading system controls the heading direction of the hull of the floating offshore plant to be kept constant based on the turret when the LNG carrier comes alongside a floating offshore plant to unload cargo, and does not employ an expensive dynamic positioning system to keep the heading direction of the hull of the floating offshore plant, thereby enhancing economic feasibility.