Large power ship shore electric power

Abstract

The invention discloses a high-power marine shore power supply which comprises electric fence high pressure three phase AC input, power supply high pressure three phase AC output and an inverter system; wherein, the inverter system is a high pressure inverter system which directly rectifies and inverts high tension electricity of the electric fence three phase AC input and then outputs high pressure three-phase alternating current, thus reducing the intermediate transforming links as well as improving the power factor of the power supply and the reliability of the products.

Description

technical field [0001] The invention relates to a shore power supply for ships docked at a port, in particular to a high-voltage, high-power frequency conversion power supply, which belongs to the technical field of power supply. Background technique [0002] Large ships, especially oil tankers and container ships, usually use fuel oil products (mostly heavy oil and diesel) to generate electricity when they are in port to meet the ship's electricity demand. Fuel products such as heavy oil and diesel produce a large amount of sulfide and nitrogen oxides during the combustion process, causing serious pollution to the surrounding environment. After pollution, the pollution can be spread to areas hundreds of kilometers away through climate effects. Moreover, many port areas at home and abroad are concentrated in urban areas, and the contradiction between pollution caused by ships calling at ports and environmental protection in central urban areas has become more and more promin...

AI Technical Summary

Problems solved by technology

This low-voltage shore power supply technology has the following disadvantages: 1. In the low-voltage shore power technology, high-power inverters are realized in parallel with small-power inverter modules. For shore power with a capacity of several megawatts In general, there are many inverter modules required to be connected in parallel, and the failure of any module will make the shore power supply must be derated or even shut down

And because of the complexity of the ship load, it is often necessary to start directly with a high-power motor, which has a strong impact on the power supply. Therefore, the reliability of the low-voltage inverter solution is greatly reduced; 2. In the low-voltage shore power supply technology, a step-down transformer is required on the power input side After step-down and inverter, sine wave filtering is required, and finally the high voltage can only be obtained after step-up transformer step-up. The step-up and step-down transformers generally use power transformers, and their efficiency is up to 95%, and the efficiency of sine wave filters is 90%. %, making the efficiency of the power supply up to 85%, which greatly reduces the system efficiency; 3. The low-voltage inverter technology generally adopts 6-pulse rectification, and the input power factor is low, which will cause great pollution to the power grid; 4. The low-voltage shore power technology , for a shore power supply with a capacity of several megawatts, its rated input current is thousands of amperes, which brings great difficulties to the power distribution design of the input and output sides

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