Bus voltage loss compensation device with backup battery and convenient for capacity expansion

Abstract

The utility model discloses a convenient-to-expand bus voltage loss compensation device with a backup battery, which comprises a direct current bus, the backup battery, a protection fuse, a battery isolation switch, a DC / DC bidirectional isolation module and a direct current monitor, the backup storage battery is electrically connected with the DC bus through the protection fuse, the battery isolation switch and the DC / DC bidirectional isolation module. The battery inspecting instrument is in signal connection with the direct-current monitoring instrument through an RS485, and the direct-current monitoring instrument is also in signal connection with the DC / DC bidirectional isolation module; and the DC / DC bidirectional isolation module is electrically connected with the DC bus through the feeder circuit breaker. According to the utility model, a set of bus voltage loss compensation device with a backup battery is added under the condition of not influencing the existing direct current system, and when the backup battery of the original direct current system is insufficient, a supplementary backup power supply is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current power supply devices, in particular to a busbar voltage loss compensation device with a backup battery which is convenient for capacity expansion. Background Art

[0002] In the existing old substations, the station AC power outages are rare, the batteries are in a floating charge state for a long time, and verification discharge is not done in time. The battery maintenance is not timely. Generally, the battery capacity drops significantly in about 5 years. However, since the battery is in a floating charge state and the early batteries lack internal resistance detection function, the remaining capacity of the battery cannot be determined. Utility Model Content

[0003] The utility model aims to provide a busbar undervoltage compensation device with a backup battery which is easy to expand, and to add a busbar undervoltage compensation device with a backup battery without affecting the existing DC system, so as to provide a supplementary backup power supply when the backup battery of the original DC system is insufficient.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A busbar undervoltage compensation device with a backup battery which is easy to expand comprises a DC busbar and a backup battery. The backup battery is provided with a battery inspection meter, and further comprises a protection fuse, a battery isolation switch, a DC / DC bidirectional isolation module, and a DC monitor. The backup battery is electrically connected to the DC busbar via the protection fuse, the battery isolation switch, and the DC / DC bidirectional isolation module. The battery inspection meter is connected to the DC monitor signal via RS485, and the DC monitor is also connected to the DC / DC bidirectional isolation module signal. The DC / DC bidirectional isolation module is electrically connected to the DC busbar via a feeder circuit breaker.

[0006] The backup battery of this solution needs to be configured with battery capacity according to project requirements; the battery inspection instrument of this solution refers to an instrument for quickly testing multiple types of batteries (groups) such as lithium-ion batteries, nickel-metal hydride batteries, and polymer batteries. It is also a supporting product for DC power supply cabinets used to measure battery voltage. The battery inspection instrument communicates with the DC monitor of this DC compensation device through RS485, and the relevant data is displayed on the device monitoring. It can monitor the battery cell voltage, internal resistance, and battery capacity; the DC monitor is also called the DC emergency monitor of the substation, which is mainly composed of two parts, the DC emergency monitoring module and the communication module. The DC emergency monitoring module includes the lower computer and ADC part, which completes the DC system information collection, overvoltage and undervoltage alarms, and grounding alarms. The communication module is composed of Li nux host computer and mobile communication part, complete the on-site display and remote transmission of DC system information, can realize various DC online monitoring functions such as real-time monitoring of bus voltage and current of DC system, AC-DC crossover detection, battery pack status detection, bus overvoltage and undervoltage detection, alarm output, local data recording, etc., with 4G mobile communication function, can remotely view the DC system status in real time through mobile phone app, and send SMS to remind operation and maintenance personnel when DC system fails.

[0007] As a preferred solution of the utility model, it also includes a battery testing device, the battery testing device includes a battery discharge switch and a discharge load, the battery discharge switch is a switch with an electric operating mechanism, the battery discharge switch is electrically connected to the protection fuse and the discharge load respectively, and the discharge load is connected to the DC monitor signal via RS485. The battery discharge load of this solution refers to the electronic device or circuit connected when the battery is discharged, which is used to extract the energy stored in the battery; the DC monitor is set to perform regular verification discharge, and the DC monitor will judge based on information collection that the device does not supply power to the bus, and after a certain date (which can be set), it will perform verification discharge to perform regular maintenance on the backup battery.

[0008] As a preferred solution of the utility model, the battery isolation switch is a normally closed switch. The battery isolation switch of this solution is reserved for replacement of internal components and is normally in a closed state.

[0009] As a preferred solution of the utility model, when the DC bus is lower than the set value, the feeder circuit breaker connects the DC / DC bidirectional isolation module and the DC bus. When the original DC system bus loses pressure, the device is powered by a backup battery pack and supplies power to the original DC bus through the bidirectional DC / DC module.

[0010] As a preferred solution of the utility model, when the backup battery power is lower than the set value, the feeder circuit breaker connects the DC / DC bidirectional isolation module and the DC bus. In this solution, when the DC bus system operates normally, the battery of the device can be charged through the DC / DC module, so that the battery pack is in a floating charge state.

[0011] This solution keeps the original DC system unchanged and adds this compensation device, which is not affected by the performance of the original DC system battery and charger manufacturers;

[0012] Select a feeder circuit breaker of corresponding capacity to connect with the compensation device. When the busbar is operating normally, the battery is charged through the DC / DC bidirectional isolation module in the compensation device through the feeder switch. The compensation device monitor is responsible for controlling the voltage and current of the DC / DC bidirectional isolation module to provide charging voltage and current for the battery. At the same time, the compensation device monitor is configured with a battery internal resistance monitoring function to monitor the battery single cell voltage and internal resistance in real time.

[0013] The busbar undervoltage compensation device of this scheme is independent of the original system. When the busbar voltage of the original DC system is lower than the set value, the busbar undervoltage compensation device supplies power to the original DC system busbar through the connecting circuit breaker. This device is equipped with an independent battery, and the battery is equipped with an internal resistance monitoring device and a periodic discharge device, which can realize automatic maintenance without manual maintenance.

[0014] Compared with the prior art, the utility model has the beneficial effect of adding a busbar voltage loss compensation device with a backup battery without affecting the existing DC system, and providing a supplementary backup power supply when the backup battery of the original DC system is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a circuit schematic diagram.

[0016] Figure 2 The utility model is a connection circuit schematic diagram with a DC bus system.

[0017] In the figure: 1. Backup battery 2. Discharge load 3. Protection fuse

[0018] 4. Battery isolation switch 5. DC / DC bidirectional isolation module

[0019] 6. Battery discharge switch 7. DC monitor 8. DC bus

[0020] 9. Feeder circuit breaker. DETAILED DESCRIPTION

[0021] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0024] See also Figure 1 , Figure 2 , the utility model provides a technical solution:

[0025] A busbar undervoltage compensation device with a backup battery that is easy to expand comprises a DC busbar 8 and a backup battery 1. The backup battery 1 is provided with a battery inspection meter, and further comprises a protection fuse 3, a battery isolation switch 4, a DC / DC bidirectional isolation module 5, and a DC monitor 7. The backup battery 1 is electrically connected to the DC busbar 8 via the protection fuse 3, the battery isolation switch 4, and the DC / DC bidirectional isolation module 5. The battery inspection meter is connected to the DC monitor 7 via RS485 signals, and the DC monitor 7 is also connected to the DC / DC bidirectional isolation module 5 via signals. The DC / DC bidirectional isolation module 5 is electrically connected to the DC busbar 8 via a feeder circuit breaker 9.

[0026] It also includes a battery testing device, which includes a battery discharge switch 6 and a discharge load 2. The battery discharge switch 6 is a switch with an electric operating mechanism. The battery discharge switch 6 is electrically connected to the protection fuse 3 and the discharge load 2 respectively. The discharge load 2 is connected to the DC monitor 7 signal via RS485.

[0027] The battery isolation switch 4 is a normally closed switch.

[0028] Workflow of the utility model: In this solution, when the DC bus 8 is lower than the set value, the feeder circuit breaker 9 connects the DC / DC bidirectional isolation module 5 with the DC bus 8, and the backup battery 1 supplies power to the original DC bus 8 through the bidirectional DC / DC isolation module 5;

[0029] When the DC bus 8 is normal and the power of the backup battery 1 is lower than the set value, the feeder circuit breaker 9 connects the DC / DC bidirectional isolation module 5 with the DC bus 8, and charges the backup battery 1 of the device through the DC / DC isolation module 5, so that the backup battery 1 is in a floating charge state;

[0030] The DC monitor 7 is used to set regular check discharge. The DC monitor 7 will determine based on the information collected that the device does not supply power to the bus, and will perform check discharge after a certain date (which can be set) to perform regular maintenance on the backup battery 1.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A busbar undervoltage compensation device with a backup battery that is easy to expand, comprising a DC busbar and a backup battery, characterized in that: The backup battery is provided with a battery inspection instrument, and also includes a protection fuse, a battery isolation switch, a DC / DC bidirectional isolation module, and a DC monitoring instrument; The backup battery is electrically connected to the DC bus through a protective fuse, a battery isolation switch, and a DC / DC bidirectional isolation module; The battery inspection instrument is connected to the DC monitor signal via RS485, and the DC monitor is also connected to the DC / DC bidirectional isolation module signal; The DC / DC bidirectional isolation module is electrically connected to the DC bus through a feeder circuit breaker.

2. According to claim 1, a busbar undervoltage compensation device with a backup battery that is easy to expand is characterized in that: It also includes a battery testing device, which includes a battery discharge switch and a discharge load. The battery discharge switch is a switch with an electric operating mechanism. The battery discharge switch is electrically connected to a protective fuse and a discharge load respectively. The discharge load is connected to a DC monitor signal via RS485.

3. The busbar undervoltage compensation device with backup battery that is easy to expand according to claim 1 is characterized in that: The battery isolation switch is a normally closed switch.

4. The busbar undervoltage compensation device with backup battery that is easy to expand according to claim 1 is characterized in that: When the DC bus is lower than a set value, the feeder circuit breaker connects the DC / DC bidirectional isolation module and the DC bus.

5. The busbar undervoltage compensation device with backup battery that is easy to expand according to claim 1 is characterized in that: When the power level of the backup battery is lower than a set value, the feeder circuit breaker connects the DC / DC bidirectional isolation module to the DC bus.

Images