Uninterrupted switching device and method for 400Hz intermediate-frequency power supply for ship

Abstract

The invention discloses an uninterrupted switching device and method for a 400Hz intermediate-frequency power supply for a ship, and the device comprises a first voltage sensor, a second voltage sensor, a third voltage sensor, a current sensor, a first full-control power electronic apparatus, a second full-control power electronic apparatus, a first switch, a second switch, and a control circuit. According to the invention, a static switching thyristor is employed, and methods of rapid voltage and current detection and power loss judgment are also employed. Moreover, the switching operation can be completed within 2.5ms, thereby guaranteeing the continuity of power supply. A proper switching strategy and a protection logic are employed, such as no switching during load short circuit, the selection of a switching point, and so on, thereby guaranteeing the safety and reliability of a switching process. A mechanical-type bypass switch is added, and the reliability of power supply is improved.

Description

technical field [0001] The invention belongs to the technical field of ships, and more specifically relates to a device and method for uninterrupted switching of a 400Hz intermediate frequency power supply for ships. Background technique [0002] In the field of ships, the intermediate frequency 400Hz power supply supplies power for navigation equipment. In order to ensure the reliability of power supply for navigation equipment, two intermediate frequency 400Hz power supplies are generally equipped, one for main use and one for backup. Under normal circumstances, the main power supply is used for power supply. When the main power supply fails, the backup power supply is switched on to ensure the continuity of the power supply of the navigation equipment. [0003] The current switching method mainly relies on manual operation, including four stages of fault occurrence, fault judgment, execution of switching, and switching end. The switching time is too long to ensure the co...

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Problems solved by technology

[0008] Aiming at the defects of the prior art, the object of the present invention is to provide a device and method for uninterrupted switching of a marine 400Hz intermediate frequency power supply, aiming to solve the problem that the switching circuit in the prior art cannot meet the continuous switching requirements of the intermediate frequency 400Hz power supply due to a delay for a period of time. technical issues

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