CN205004832U - Electric power direct current operation electrical power generating system - Google Patents

Abstract

The utility model discloses an electric direct current operating power supply system, which comprises a rectification module, a storage battery pack and a spare battery. The input end of the rectification module is connected to an external alternating current, and the output end is connected to a DC bus; the storage battery pack is composed of a plurality of battery modules. Each battery module is connected in series on the DC bus; it also includes a battery activation module, the battery activation module is composed of a control unit, a battery activation function unit, a boost function unit and a step-down charging function unit; the battery activation module is connected to the DC bus , the backup battery is connected to the battery activation module. The utility model uses the boost function unit of the battery activation module to convert the 12V DC voltage of the backup battery into a 220V DC voltage to supply power to the DC load of the substation; and the step-down charging function unit can reduce the external DC 220V voltage to 12V voltage for use in Charge the spare battery.

Description

An electric DC operating power supply system

technical field

The utility model belongs to the technical field of electrical equipment, in particular to an electric DC operating power supply system.

Background technique

Electric DC operating power supply system is the substation's operating power supply for control, signal, and relay protection, as well as the security power supply and emergency lighting power supply for important equipment. Monitoring and maintaining the integrity of DC equipment is very important to the safe and reliable operation of substations and the entire power system.

The battery is an important part of the electric DC operating power system. In the case of an AC power supply interruption, the battery provides a reliable protection power supply, closing and opening power supply. When the power system fails, the protection device can send a protection signal in time to cut off the fault. Lines ensure the safe operation of the power system, so the quality of battery maintenance is directly related to the safe operation of the power system. During the working process of the battery, most of the working conditions are low-current discharge and use, and a larger current is used for equal charging. In this way, only a small amount of charging is performed, and only charging does not discharge, so that the battery generally has a "sulfurization" phenomenon, which reduces the battery life. capacity. Therefore, the power DC operating power system stipulates that a reconciliation charge and discharge activation should be carried out every quarter to solve the "sulfurization" problem. When performing the activation operation, the battery switch should be disconnected to separate the battery pack from the charging module, and a load should be connected to both ends of the battery pack. An activation test takes two days, the operation time is long, and the manual operation is intensive. During the activation test, the battery is operated without the system, but if the AC power supply is interrupted at this time, the DC system cannot provide operating power, which will bring harm to the operation of the substation.

Contents of the invention

The purpose of the utility model is to solve the above problems and provide an electric DC operating power supply system that can activate the storage battery without causing harm to the operation of the substation.

For this reason, the technical solution of the utility model is: a kind of electric direct current operation power supply system, comprises rectification module, storage battery pack and backup battery, and the input end of described rectification module is connected with external alternating current, and the output end is connected with DC bus; Composed of multiple battery modules, each battery module is connected in series on the DC bus; it is characterized in that it also includes a battery activation module, and the battery activation module is composed of a control unit, a battery activation function unit, a boost function unit and a step-down charging function unit; The battery activation module is connected to the DC bus, and the backup battery is connected to the battery activation module.

When the utility model works normally, the rectifier module provides working power for the DC load of the substation on the one hand, and charges the battery pack on the other hand, and the backup battery also works in the charging mode. When the external AC power supply disappears, the DC load is powered by the battery to ensure the continuity of the DC load power supply of the substation. When the external AC power supply disappears and the battery pack also fails, the boost function module of the battery activation module can convert the 12V DC voltage of the backup battery into 220V DC voltage to supply power to the DC load of the substation, thereby ensuring the continuity of the operating power supply. The utility model uses the boost function unit of the battery activation module to convert the 12V DC voltage of the backup battery into a 220V DC voltage to supply power to the DC load of the substation; and the step-down charging function unit can reduce the external DC 220V voltage to 12V voltage for use in Charge the spare battery; the battery activation function unit is used to activate the battery pack and spare battery to prevent the battery from vulcanizing.

Description of drawings

Further details will be given below in conjunction with the accompanying drawings and embodiments of the present utility model.

Fig. 1 is the schematic diagram of the principle of the utility model.

detailed description

See attached picture. This embodiment includes a rectification module 1, a storage battery pack 2 and a backup battery 3, the input end of the rectification module 1 is connected to an external alternating current 4, and the output end is connected to a DC bus 5; the storage battery pack 2 is composed of a plurality of battery modules, and each battery module Connected in series on the DC bus 5; also includes a battery activation module 6, the battery activation module 6 is composed of a control unit, a battery activation function unit, a boost function unit and a step-down charging function unit; the battery activation module 6 is connected to the DC bus 5, the backup battery 3 is connected to the battery activation module 6.

The battery modules in the battery pack 2 and the backup battery 3 in this embodiment both include a battery, a control switch and a terminal, and the battery can enter different working states through different connections of the terminals on the control switch.

In this embodiment, a plurality of battery modules in the battery pack 2 are connected in series on the DC bus, and the rectifier module 1 charges them, and at the same time, the battery pack 2 supplies power when there is a large-capacity impact load externally; the backup battery 3 also works in the charging mode. The DC 220V voltage is changed to 12V by the step-down charging unit of the battery activation module 6 to charge the backup battery.

During normal operation, the storage battery needs to be activated at regular intervals. During the activation operation, the positive and negative poles of a single battery module to be activated are respectively connected to the positive and negative poles of the battery activation functional unit in the battery activation module 6; the spare battery 3 The positive and negative poles of the battery are connected to the DC bus 5, and the battery activation function unit of the battery activation module starts the activation work. At this time, the battery to be activated is connected to the battery activation module 6 through the interface of the battery activation function unit, and the battery activation module activates it. While activating the battery, in order not to affect the normal operation of the DC system, the spare battery 3 is connected in series to the battery pack.

During the operation of the DC system, when the backup battery 3 needs to be activated, the positive and negative electrodes of the backup battery 3 are respectively connected to the positive and negative electrodes of the battery activation functional unit in the battery activation module 6; the battery activation functional unit of the battery activation module 6 starts the activation work. At this time, the backup battery 3 is connected to the battery activation module 6 through the interface of the battery activation function unit, and the battery activation module 6 activates it.

During the working period of the DC system, when the external AC power source 4 disappears, the DC load is powered by the battery pack 2 to ensure the continuity of the DC load power supply of the substation. When the storage battery pack also breaks down at the same time, the positive and negative poles of the backup battery 3 are respectively connected to the positive and negative poles of the boost function unit in the battery activation module 6, and the control unit starts the boost function unit to work, and the battery activation module 6 will backup The voltage of the battery 3 is raised from DC 12V to DC 220V to supply power to external loads and ensure the continuity of the operating power supply.

In this embodiment, the wiring of the storage battery, control switch, and terminal in the storage battery pack 2 and backup battery 3, and the wiring of various standard interfaces are all completed in the factory. When the DC system is installed on site, it is only necessary to connect each battery module according It is required to put it on the installation board, plug the standard interface with the terminal of each module, and then the wiring of the system can be completed. The whole wiring process takes a short time, and the operation is convenient and safe. When a certain battery module needs to be replaced, it only needs to be disconnected from the standard interface to realize the replacement of the battery module.

Claims (1)

1. an electric power DC operation power source system, comprises rectification module, batteries and reserve battery, and described rectification module input connects external communication electricity, and output connects DC bus; Described batteries is made up of multiple battery module, and each battery module series connection is on DC bus; It is characterized in that: also comprise cell activation module, cell activation module is made up of control unit, cell activation functional unit, boost function unit and step-down charge function unit; Described cell activation module is connected on DC bus, and reserve battery is connected in cell activation module.