Ship battery system power supply and distribution device and control method thereof

Abstract

The invention relates to a ship battery system power supply and distribution device and a control method thereof. The device comprises a main controller and power supply and distribution modules withthe same number as battery packs, wherein a ship DC power grid is connected with a plurality of battery packs through the ship battery system power supply and distribution device; the main controllerreceives a control signal from the energy management system, switching the battery system operating mode; before any battery pack is connected to or separated from the ship direct-current power grid,the main controller controls the module controller to start an adjusting function, the set output voltage value Vf of the battery system is kept consistent with the voltage value of the ship direct-current power grid, then the module controller controls a charging direct-current contactor and a discharging direct-current contactor to be switched on or switched off, and the battery packs are connected into or separated from the ship direct-current power grid. According to the invention, it is ensured that the battery pack is reliably and smoothly connected into a ship direct-current power grid;under various fault conditions of the battery pack, different control strategies are adopted to meet the operation requirements of the ship system, and the safety, reliability and stability of the ship battery system are effectively ensured.

Description

Technical field [0001] The invention relates to a power supply and distribution technology for a ship battery system, in particular to a power supply and distribution device for a ship battery system and a control method thereof. Background technique [0002] With the country's emphasis on environmental protection, as well as the continuous improvement of battery technology and ship DC networking technology, it has promoted the vigorous development of the new energy ship market. Under normal use, the ship battery power system performs well, with good maneuverability, convenient maintenance, good economy, and low pollutant emissions. [0003] At present, the typical ship battery pack scheme 1 consists of 10 battery packs in series, and the single battery pack consists of 20 battery cells in series. The battery pack voltage is 640 volts and the battery pack power is about 150kWh; the typical ship battery pack scheme 2 consists of 20 battery packs are connected in series, and a singl...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing when the existing ship battery packs are incorporated into the ship's DC grid for operation, and proposes a ship battery system power supply and distribution device and its control method. The state of charge SOC is basically consistent, and the remaining power of each battery pack is roughly equal. Each battery pack operates in a constant current mode through the power supply and distribution module, and discharges together until the lowest discharge state (SOC=10%); Under certain circumstances, the state of charge SOC of each battery pack has a certain difference, and the remaining power of each battery pack is not equal. The lowest discharge state SOC = 10%; in case five, when the primary and secondary alarm values ​​of overcurrent, high temperature, excessive pressure difference and excessive temperature difference occur, it will enter the current limiting mode, and the power supply and distribution module will reduce the current output The method actively suppresses the further occurrence of overcurrent, high temperature, large pressure difference, and large temperature difference. If there is improvement, exit the current limiting mode. If there is no improvement and exceeds the third-level alarm value, the power supply and distribution module controls the DC contactor for separate charging. and discharge DC contactor

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