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A pure electric ship DC switchboard electrical system and its control method

A DC power distribution and electrical system technology, applied in the field of ships, can solve the problems of no pre-charging function and small load impact on the DC distribution board

Active Publication Date: 2021-06-01
XIAN YONGDIAN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the electric energy of the diesel engine-generator power station is regulated by the diesel engine speed and engine excitation, and the adjustment process is a linear process, which will not cause a sudden change in the electric energy of the power station, and has little or no impact on the load, so its DC distribution board does not have a pre-charging function , the input and removal of the high-voltage box can be regarded as an instantaneous process, and the pre-charging function needs to be set

Method used

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  • A pure electric ship DC switchboard electrical system and its control method
  • A pure electric ship DC switchboard electrical system and its control method

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Effect test

Embodiment 1

[0065] The high-voltage box of the electrical system of the DC switchboard of the present invention is a large-capacity battery pack, and the battery pack is divided into two storage battery high-voltage boxes according to equal capacity to form two high-voltage boxes. The two high-voltage boxes carry out confluence and redistribution of electric energy through the DC distribution board.

[0066] The busbar is divided into two sections through the bus isolating switch to improve the redundancy of the busbar. Each high-voltage box corresponds to a section of the busbar.

[0067] The front-end power station system of the two busbars is exactly the same as the rear-end load system, forming two independent partitions of the ship's electrical system.

[0068] The electrical system of the DC distribution board of the present invention is specifically as follows: for the power station system, the output terminal of the power station is connected to the energy storage converter to ens...

Embodiment 2

[0081] refer to figure 2 , a method for controlling the DC switchboard electrical system of a pure electric ship, the parameters of the storage battery high-voltage box corresponding to the parameters of the DC switchboard in the present invention are, the capacity of a single power station is 1000AH, the power is 600kWh, and the voltage is DC600V; The corresponding charging AC shore power supply has a capacity of 350kVA 3-phase 380V mains. The bus voltage is DC750V medium voltage, and the DC bus is divided into two sections through the DC750V, 200A bus tie switch QS1, and the 250A fast fuse is used at the section to protect the bus from short circuit.

[0082] In order to control the grid-connected operation and charging voltage of the two power stations, the parameters of the selected energy storage converter U1 are 120kW, DC750V bidirectional energy storage power converter. In order to realize the boost function, DC750V, 92A, 1.023 mH of the storage reactor L1.

[0083] ...

Embodiment 3

[0099] A control method for the electrical system of a pure electric ship direct current switchboard, the control method specifically includes the following steps:

[0100] Use different types of power converters, controlled switches, etc. to realize the discharge control and charge control of the battery power station, and to monitor and protect the state of the battery power station.

[0101] Each power converter in the electrical system contains energy storage capacitors, and the electrical system is equipped with a pre-charging function to protect the energy storage capacitors of the power converters in the electrical system of the distribution board against the impact of the current change rate. The specific situation is the sudden switch when the battery power station is discharging and the AC shore power sudden switch when the battery power station is charging.

[0102] A high-voltage status monitoring and indicating module is installed in the electrical system to monit...

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Abstract

A pure electric ship DC power distribution board electrical system and its control method, the charging system branch, the discharge system branch, the pre-charging system branch, and the high-voltage indication function of the system are sub-system designed and then integrated, so that the electrical system It has both a discharge system and a charging system, which solves the current problem of difficult charging of marine batteries; this electrical system has high-voltage status monitoring and indication functions, and is an important functional design for the development of ship electrification.

Description

technical field [0001] The invention belongs to the technical field of ships, and in particular relates to an electrical system of a pure electric ship DC switchboard and a control method thereof. Background technique [0002] The working noise of fuel-powered ships is high, and they emit a large amount of carbon oxides, nitrogen oxides, sulfur oxides, and PM2.5 particles. Especially when fuel-powered ships enter and leave the dock at low speed, or when loading and unloading cargo at the dock, the pollution, noise Pollution is more serious. Therefore, pure battery-powered ships have become a direction for the future development of ships, and the original main switchboard is completely unable to meet the power distribution and power station management functions of the new battery power station. [0003] At present, the main switchboard of the electric propulsion ship power station is an AC main switchboard. The internal detection component is a transformer, and the internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00H02J7/00
CPCH02J1/00H02J7/0047H02J7/0068
Inventor 司向飞王伟王翠云孟少邦姚世强李岩盛怡
Owner XIAN YONGDIAN ELECTRIC
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