Land power source device for ship

Abstract

The present invention provides a land power source device for ship, which can cause an output frequency of a ship power generator to coincide with the frequency of a land power source and can simply perform system switching. The land power source for ship is provided with the following components: a power converter, an AC filter which is provided between an output of the power converter and a shutter, a control mechanism for controlling the power converter, a first voltage detector and a second voltage detector. In the power supply from the power generator in the ship for the load equipment at a state that the shutter is closed, the control mechanism performs phase control so that an output frequency of the power converter is same with the frequency of a detection voltage of the voltage detector and furthermore the phase difference is minimized. Furthermore voltage control is performed so that the voltage difference between the detection voltage of the first voltage detector and the detection voltage of the second voltage detector is minimized. When the phase difference is smaller than a preset value and the voltage difference is smaller than a preset threshold, an output shutter is switched on, and the power generator in the ship is switched off.

Description

technical field [0001] The present invention relates to a land power supply device for ships for supplying electric power to a ship from land, for example, while the ship is moored. Background technique [0002] Conventionally, electric power supplied to various electrical equipment mounted on a ship has been supplied from a generator mounted on the ship regardless of whether the ship is sailing or moored. However, in recent years, in consideration of the global environment, in order to reduce exhaust gas discharge, when a ship enters a port, the generator of the ship is stopped, and power is supplied to the ship from a power supply device arranged on land. [0003] When the power supply system is switched from a ship's generator to a land power source, if the switch is not performed without instantaneous power failure, the power supply to the load will stop for a short time, and problems may occur in information equipment, etc. in the ship. Therefore, there is a proposal t...

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Problems solved by technology

[0005] The method described in Patent Document 1 is effective only when the output frequency of the ship's generator is the same as the frequency of the land power supply (usually 60 Hz). In addition, if the frequency and voltage of the land power supply are unstable, Then, the above-mentioned synchronous adjustment at the time of system switching takes time and is relatively difficult.

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