Current conversion device for ship shore power system

Abstract

The invention relates to a current conversion device for a ship shore power system, and the device comprises a rectifier side current conversion apparatus, an inverter side current conversion apparatus, and a fault removing apparatus. The fault removing device mainly comprises an AC switch, a DC switch, a bypass switch, a grounding switch, and a fuse. A control system achieves the automatic removing of different fault ends through the control of the AC switch, the DC switch, the bypass switch and the grounding switch. The device is advantageous in that the device can convert the alternating current in a harbor power grid into a current with the voltage level and frequency required by a ship; the device improves the system reliability through employing a positive and negative two-stage structure; the device reduces the input current harmonic waves of an alternating current side through employing a twelve-pulse-wave current converter, improves the system voltage stability, and reduces the fault rate of equipment; meanwhile, the fault removing device can achieve the automatic and quick removing of a fault in an operation process, guarantees no power failure in a power supply process of the system, and does not affect the normal power supply of the ship.

Description

technical field [0001] The invention relates to the field of ship shore power systems, in particular to a converter device for ship shore power systems. Background technique [0002] With the rapid development of China's economy and the continuous expansion of foreign trade, the production scale of ports has grown rapidly, and issues such as port energy consumption and pollutant emissions cannot be ignored. When large ships are in port, they mainly use their own diesel generator sets to provide ship electricity. Since diesel generator sets require a large amount of fuel oil (heavy oil or diesel oil), a large amount of sulfide and nitrogen oxides generated during the fuel oil generation process seriously pollute the surrounding environment. In this environment, the use of shore power not only saves non-renewable fuel but also plays a great role in environmental protection. [0003] There are three main types of ship electrical system used in different countries: three-phase ...

AI Technical Summary

Problems solved by technology

[0004] The current shore power devices for inland ships are all simple frequency conversion devices, which have the disadvantages of small pulse number and large harmonic content. The current converter adopts three-phase two-level full-control bridge unit DC output terminals connected directly in series. When a certain When the series converter unit fails, the entire converter needs to be blocked and shut down, and the ship has no power supply, which affects the normal work of the ship and power supply for life

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