Device for monitoring and balancing storage battery voltage

Abstract

The invention provides a device for monitoring and balancing storage battery voltage. The device for monitoring and balancing the storage battery voltage comprises multiple monitoring and balancing units, a digital-analog acquisition chip and a central processing unit, wherein each monitoring and balancing unit is correspondingly connected with a storage battery cell and is also connected with the digital-analog acquisition chip and the central processing unit, and the digital-analog acquisition chip is connected with the central processing unit. The voltage signal of each storage battery cell is transmitted to the digital-analog acquisition chip to be calculated through the monitoring and balancing unit connected with the storage battery cell, the average voltage of the whole storage battery pack is calculated through the central processing unit after analog-digital conversion is conducted on all the voltage signals, different control signals are output to the corresponding monitoring and balancing units according to the comparison results obtained by comparing the voltages of the storage battery cells with the average voltage of the whole storage battery pack, and then control over the working states of the storage battery cells connected with the monitoring and balancing units is achieved. According to the device for monitoring and balancing the storage battery voltage, both the storage battery voltage monitoring function and the voltage balancing function are achieved, the service life of each storage battery cell is prolonged, the service life of the whole storage battery pack is prolonged, and the reliability of a backup direct-current power supply of a transformer substation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power system substation power system and battery technology, in particular to a device for monitoring and equalizing battery voltage. Background technique [0002] The battery is the only reserve energy in the substation, and it is the backup guarantee to support the operation of key equipment in the substation when the AC power supply of the substation loses voltage. [0003] In the current management method of substation batteries: On the one hand, important parameters such as battery voltage mainly rely on manual means such as daily inspections and annual inspections to check and record. When the battery parameters exceed the limit, an alarm is issued in time. Once the operation and maintenance personnel fail to know the internal open circuit of the battery in time, there will be a huge risk that the battery will not be able to supply power when the AC power supply of the substation loses voltage. [...

AI Technical Summary

Problems solved by technology

[0003] In the current management method of substation batteries: On the one hand, important parameters such as battery voltage mainly rely on manual means such as daily inspections and annual inspections to check and record. When the battery parameters exceed the limit, an alarm is issued in time. Once the operation and maintenance personnel fail to know the internal open circuit of the battery in time, there will be a huge risk that the battery will not be able to supply power when the AC power supply of the substation loses voltage.

[0004] On the other hand, there are generally phenomena such as excessive voltage deviation and unbalanced voltage in substation batteries at present.

The disadvantages of the unbalanced battery voltage are as follows: 1. The battery with too high voltage is in an overcharged state for a long time, which will cause the battery to lose water and swell, and the battery with too low voltage will be undercharged for a long time, which will cause the battery to vulcanize and crystallize. The body voltage is unbalanced, which shortens the service life of the whole set of batteries and quits operation; 2. In addition to the hazards of the batteries themselves, the swelling of the batteries may also cause fires, DC voltage loss in the entire station, and even burnout of the main transformer.

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