Wharf marine shore power system

Abstract

An onshore power system for a wharf ship, comprising a high voltage variable frequency power supply device (1), a high voltage junction box (2), a high voltage cable reel (3) and a shipborne transformer substation (4); the high voltage variable frequency power supply device (1) comprises a high voltage cable incoming cabinet and a transformer; a high voltage cable is connected into the high voltage cable incoming cabinet and is then led out to the transformer; the high voltage cable incoming cabinet is provided with multiple levels of current-limiting resistors; the transformer is connected to a frequency converter via the high voltage cable; the frequency converter consists of a plurality of PWM power units connected in series and in parallel, and is connected to a sinusoidal filter via the high voltage cable; and the sinusoidal filter is connected to a high voltage cable outgoing cabinet via the high voltage cable. The onshore power system for a wharf ship is a power supply system used on a wharf for supplying in-harbor ships with various standards of power supplies such as 400V, 415V, 440V, 690V, 6.6kV, 50 / 60Hz and the like, and has the advantages of energy saving, emission reduction, environmental protection, and wide application scope.

Description

technical field [0001] The invention relates to a ship power supply system, in particular to a dock ship shore power system. Background technique [0002] According to information, my country is the world's largest water transport country, with an annual port cargo throughput of more than 7 billion tons, ranking first in the world. There are a huge number of ships berthing and loading and unloading cargo in my country's coastal and inland ports every year, mainly including general cargo ships, bulk carriers, container ships, automobile ships, log ships, chemical ships, liquefied gas ships, passenger ships and oil tankers. Since almost all ships in the world use generators that burn light or heavy diesel to generate their own electricity, ships emit a large amount of carbon dioxide, sulfides and nitrogen compounds, which have a serious impact on the atmospheric environment. [0003] Ships docked at the dock must use ship auxiliary engines to generate electricity 24 hours a d...

AI Technical Summary

Problems solved by technology

This kind of inverter is used as a power supply, and has insurmountable defects: the inverter is a power supply that can change the frequency and voltage, and is composed of AC-DC-AC circuits. , filtered by electrolytic capacitors and inductors into a smooth DC, and finally passed through an inverter, inverted into a three-phase AC with adjustable voltage and frequency

The harmonic voltage drop caused by the high-order harmonic current on the line causes the grid voltage waveform to be distorted. This distortion affects other loads, resulting in reduced efficiency of electrical equipment, increased noise, and even resonance in some equipment, resulting in overheating of the equipment. It will also bring serious electromagnetic interference to instrumentation devices and telecommunication equipment, and pose a serious threat to the accuracy of test devices and the reliability of data.

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