A method for synchronous grid connection and stable power transfer of dual-frequency shore power supply

Abstract

A dual-frequency shore power source synchronous grid-connection and smooth power transfer method is disclosed. The method comprises the steps of performing synchronous grid-connection control and power transfer control through a controller; collecting three-phase voltage UAmp in shore power source side, voltage ULoad of a load circuit and voltage UGen in diesel generator output side; through analyzing and calculating, enabling the shore power source to be inverted into voltage that is accordant with the voltage in the shipboard side by adopting a VF mode; then adopting a droop control mode, performing secondary frequency modulation and voltage regulation control to regulate the voltage amplitude phase angle for realizing rapid synchronous grid-connection so as to realize parallel operation of the shore power source and the diesel generator; and realizing smooth power transfer of the shore power source and the diesel generator through the secondary frequency modulation and voltage regulation control. According to the dual-frequency shore power source synchronous grid-connection and smooth power transfer method, the smooth switch and power transfer of the shore power source and the diesel generator are realized; the load on the ship is powered in an uninterrupted manner in the switching process; and the control policy is high in applicability.

Description

technical field [0001] The invention belongs to the field of electric power systems, and relates to a shore power supply control technology, in particular to a dual-frequency shore power supply synchronous grid connection and power stable transfer method. Background technique [0002] The power supply in the port area of ​​our country adopts 50Hz AC power supply, and the ships calling at the port may come from different countries. The power supply for low-voltage ships is divided into two AC systems: 50Hz and 60Hz. shore power supply. [0003] In most current low-voltage shore power systems, the switching process between ship power and shore power is divided into two types: [0004] 1. Power-off switching. When the ship is docking or leaving the port, it uses the power-off method to connect or cut off the shore power supply, which brings great inconvenience to the power consumption of the ship. [0005] 2. Live switching. During the switching process from ship power to sho...

AI Technical Summary

Problems solved by technology

[0004] 1. Power-off switching. When the ship docks and leaves the port, it uses the power-off method to connect or cut off the shore power supply, which brings great inconvenience to the power consumption of the ship.

[0005] 2. On-line switching. During the switching process from ship power to shore power, the shore power supply adopts VF control mode. After grid connection, it is required to disconnect the ship power in time, otherwise it will easily lead to overloading of the ship generator or shore power supply, and When the diesel generator or shore power supply is cut off, the impact on the load side is very large, resulting in unstable power supply on the side of the ship

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