Distributed management and control system and method for battery pack

Abstract

A distributed management and control system for battery packs of the present invention includes a battery, a voltage and current detection module, an uninterrupted power supply system, and a voltage compensation system. The uninterrupted power supply system includes a battery state monitoring device, a power switch, a bypass switch, and a bypass control system. unit, the voltage compensation system includes an adjustable rheostat, a compensation battery, a compensation switch, a voltage-resistance sub-control unit, a DC‑DC converter, and batteries connected in series to form a battery pack. The circuit switch is closed and the power switch is opened to short-circuit the faulty battery. At the same time, the voltage resistance sub-control unit controls the compensation switch to close, so that the compensation battery is connected to the battery pack, and the output voltage and voltage are adjusted by controlling the DC-DC converter and the adjustable rheostat. Connect the resistance value so that the battery pack can normally output 220V voltage to the DC bus, prevent the risk of the overall battery stop discharging and the DC bus losing voltage, ensure a constant current, and improve the quality of power supply.

Description

technical field [0001] The invention relates to the technical field of battery stability control, and in particular, to a distributed management and control system and method for a battery pack. Background technique [0002] As the backup power supply of the DC system in the substation, the battery provides 220V voltage to the DC bus when the charger is powered off, and the battery voltage is 2.1V. There are 104 batteries in the battery room to form 220V. The discharge cut-off threshold of the single battery is generally 1.8V. The cut-off threshold of the group is determined by the nominal voltage of the DC bus, and the discharge is terminated when the discharge cut-off voltage of the single battery or the whole group of batteries is reached. [0003] After the battery leaves the factory, due to the performance degradation during the unified discharge and charging process, the capacity of individual batteries will be low, and the "barrel effect" will appear, that is, during ...

AI Technical Summary

Problems solved by technology

[0003] However, after the battery leaves the factory, due to the performance degradation in the unified discharge and charging process, the capacity of individual batteries will be low, and a "barrel effect" will appear, that is, individual batteries will first drop to the voltage threshold during the discharge process, making the entire battery pack Suspend discharge. At present, the fixed inspection in the power station is generally once every six months. It is difficult to find out that the battery is under capacity. If the capacity of the battery decreases within a short period of time after it is put into operation, it will cause the protection of the secondary system to refuse to operate, lockout failure, protection misoperation and lead to fault leapfrogging , bringing the risk of voltage loss in the DC system and the entire DC station

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