A device and method for synchronous non-stop switching of shore power and ship power

Abstract

The present invention discloses a shore power ship power synchronization uninterrupted switching apparatus and method. The apparatus comprises a shore power ship power switching control unit, a high-voltage shore power source, and a high-voltage solid-state transfer switch. A switching control process comprises that the shore power ship power switching control unit collects a shore power output voltage and current, and a ship power voltage and current, and then performs accurate synchronization calculation of shore power and ship power switching, so that an amplitude difference, a frequency difference, and a phase difference between the shore power output voltage and the ship power voltage are smaller than a threshold, and the unit turns on a three-phase controlled switch unit S1 connected to the high-voltage shore power source; calculates ship load power according to the collected ship power voltage and current, after controlling shore power output power to reach a supplied ship load, turns off a three-phase controlled switch unit S2 connected to a ship electric generator, and sends a ship electric generator stop instruction. The present invention may ensure that an important load on a ship is supplied with power continuously and stably, and realizes the switching from ship power to shore power without interrupting a ship load, thereby improving an automation level of a green port and a shipyard.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a shore power ship power synchronous switching device and method without power failure. Background technique [0002] In order to convert the land power grid of my country's ports and shipyards into a 50Hz power supply, and convert it into a 60Hz or 50Hz power supply acceptable to the ship power station through frequency conversion and voltage transformation, the shore power supply only uses power electronic converters. When the power electronic converter is connected in parallel with the large power grid, its output voltage is not affected by the grid voltage, and the output power can be controlled by controlling the output current of the inverter link. Compared with the large land power grid, the independent weak power grid with limited capacity of the ship power grid, if the inverter link is incorporated into the ship power grid according to the conventional current ...

AI Technical Summary

Problems solved by technology

Compared with the large land power grid, the independent weak power grid with limited capacity of the ship power grid, if the inverter link is incorporated into the ship power grid according to the conventional current source control method, it will have a negative impact on the ship power system and even cause power outages

Therefore, when the shore power is connected to the ship's power, switching measures must be taken. The current conventional method needs to disconnect the ship's power generation first, and then connect to the shore power intermittently. It is not conducive to continuous and stable power supply to important loads on ships

In the switching process of non-stop shore power and ship power, if the shore power supply is directly switched and connected to the ship power grid, the voltage phase, amplitude and frequency of the two may be different, resulting in a current shock and damage to the power equipment on the ship.

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