Remote discharge detection and maintenance system of communication storage battery pack

Abstract

The invention discloses a remote discharge detection and maintenance system of a communication storage battery pack, and relates to the technical field of a charge-discharge device of a storage battery pack. The system comprises a controller, a storage battery pack data acquisition module, a power grid data acquisition module, a charge-discharge control circuit and an inversion grid-connection module, wherein a signal input end of the storage battery pack data acquisition module is connected with the storage battery pack, the power grid data acquisition module is connected with a charging power grid of the storage battery pack, the charging power grid is divided into three paths sequentially by a rectifier and the charge-discharge control circuit, a first path is connected with a load, a second path is connected with the storage battery pack, a third path is connected with the inversion grid-connection module, and a control output end of the controller is connected with the charge-discharge control circuit and a control end of the inversion grid-connection module. The maintenance system has the characteristics of high discharge maintenance efficiency and application safety, and automatic charge and discharge can be achieved.

Description

technical field [0001] The invention relates to the technical field of charging and discharging devices for battery packs, in particular to a remote discharge detection and maintenance system for communication battery packs. Background technique [0002] The communication battery packs in substations need to be regularly checked and maintained every year. However, traditional battery discharges are time-consuming and labor-intensive, with low maintenance efficiency and safety risks, resulting in many battery packs not being effectively maintained. figure 1 It is a schematic diagram of the connection of the electric DC system that is not connected to the system. This way of increasing battery capacity by connecting batteries in parallel, and using the same rectifier for charging at the same time, the two sets of batteries are not isolated, there are the following potential safety hazards. [0003] 1) During the maintenance process of the first battery group, the second batte...

AI Technical Summary

Problems solved by technology

This way of increasing battery capacity by connecting batteries in parallel, and using the same rectifier for charging at the same time, the two sets of batteries are not isolated, there are the following potential safety hazards

[0003] 1) During the maintenance process of the first battery group, the second battery group is not disconnected from the bus: when the first battery group is discharged and integrated into the system, the voltage difference between the second battery group and the first battery group is relatively small. Large, if there is an AC power loss or rectifier voltage drop at this time, a charging loop will be formed between the second battery pack and the first battery pack. Since the internal resistance of the first battery pack is very small, the loop current is very large and cannot be controlled. , will cause damage to the first battery pack

[0004] 2) During the maintenance process of the first storage battery group, the second storage battery group is disconnected from the busbar: at this time, the two sets of batteries are disconnected from the DC busbar. Once the AC power failure occurs, the DC system has no backup power supply, and the substation communication equipment won't work

This method cannot meet the requirements of the standby N-1 security guarantee required by the grid

[0005] 3) When the battery pack supplies power to the load after the AC power failure, the voltage will drop. If the discharge time is long, when the AC returns to normal, the rectifier fails to adjust the voltage in time, which will cause a large gap between the rectifier and the battery. If the voltage difference is large, the battery pack will be charged at this time, and there will be a battery charging surge problem.

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