Abstract: A reception-side terminal apparatus transmits reception request data to a management server apparatus, the reception request data containing the vessel ID of the fuel-cell vessel, a date and time, a position, and an amount requested for reception of hydrogen. A supply-side terminal apparatus transmits supply offer data to the management server apparatus, the supply offer data containing the vessel ID of the hydrogen supplier vessel, a date and time, a position, and an amount allowing supply of hydrogen. The management server apparatus generates supply schedule data based on the reception request data and the supply offer data, the supply schedule data containing the vessel ID of a fuel-cell vessel to receive the supply of hydrogen, the vessel ID of a hydrogen supplier vessel to supply hydrogen to the fuel-cell vessel, and a scheduled date and time, a scheduled position, and a scheduled amount for supplying hydrogen to the fuel-cell vessel.

Abstract: An unbalanced switching circuit is connected with a bi-directional control rectifier in such a manner that variance of counter electro motive forces produced by rotation of an AC motor affects the lower switching voltage in the unbalanced switching circuit through diodes and a capacitor to increase or decrease the conduction angle of the bi-directional control rectifier.