Charging and discharging control method and device and UPS system

Abstract

The invention provides a charging and discharging control method which comprises the following steps: a charging or discharging enable signal of an inverter is received, and a slave relay is disconnected under the condition that a battery pack fault exists in a battery pack; if the number of charging and discharging over-current times is less than L, a battery management module sends a control instruction for closing the slave relay to a battery detection unit and enters a pre-charging control flow; and if the battery pack meets a charging starting condition, whether the current charging current value is smaller than a first preset current value or not is judged. The invention further provides a charging and discharging control device and a UPS system. According to the invention, the charging and discharging of the battery pack can be controlled, switching between a charging mode and a discharging mode can be realized, and the situation in which the performance of the battery pack is influenced and the cyclic service life of a single battery is shortened due to charging and discharging under the condition that the battery pack has a fault can be avoided.

Description

technical field [0001] The invention relates to the technical field of uninterruptible power supplies, in particular to a charging and discharging control method, device and UPS system. Background technique [0002] UPS (Uninterruptible Power System / Uninterruptible Power Supply), that is, uninterruptible power supply, is a system device that connects the battery (lead-acid battery or lithium battery) with the host, and converts DC power into commercial power through a module circuit such as the host inverter. , which is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic precision equipment. [0003] During the working process of the existing UPS system, when the battery pack has overcharge, overdischarge, large charge and discharge current, short circuit and other faults, there is no effective control of the charge and discharge and the UPS system can freely switch between charge and discharge ...

AI Technical Summary

Problems solved by technology

[0003] During the working process of the existing UPS system, when the battery pack has faults such as overcharging, over-discharging, large charging and discharging current, short circuit, etc., there is no effective control of the charging and discharging capacity and the free conversion of the UPS system between charging and discharging modes. A charging and discharging control strategy with good stability and high reliability will seriously affect the performance of the battery pack and shorten the cycle life of the single battery; therefore, how to control the charging and discharging of the UPS system to ensure that the UPS system can effectively control the battery pack It is a problem to be solved to improve the charging and discharging quality of the UPS system and improve the stability and reliability of the UPS system.

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