Symmetrical balance type DC power supply system wiring structure
By adopting a symmetrical balanced DC power supply system wiring structure, using dual battery banks and charging devices, combined with intelligent circuit breakers and monitoring devices, the problem of power loss of the entire busbar caused by a single battery bank on a single busbar was solved, thus improving the safety and reliability of small-scale power projects.
Patent Information
- Application Number
- CN202423282099.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing DC systems, a single busbar and a single battery pack can cause the entire busbar to lose power when the battery fails, resulting in reduced safety and reliability.
The system adopts a symmetrical balanced DC power supply system wiring structure, including two sets of battery banks and charging devices, which are connected to the busbar through intelligent circuit breakers and equipped with insulation and condition monitoring devices to realize mutual backup and centralized monitoring of the batteries.
It improves the reliability and safety of DC systems in small-scale power projects, meets flexibility requirements, and ensures that the power supply of the entire busbar is not affected in the event of battery problems.
Smart Images
Figure CN223729498U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a symmetrical balanced type direct current power supply system wiring structure. BACKGROUND
[0002] The direct current system of single busbar single battery connection has the difficulty that the direct current battery cannot be off-line maintained due to only one group of battery pack, and once the battery of the direct current system has a problem when the plant and station alternating current loses power, the whole busbar will lose power, and the safety and reliability are reduced. SUMMARY
[0003] The utility model solves the technical problem that the whole busbar loses power and the safety and reliability are reduced due to the problem of the existing direct current system battery, and provides a symmetrical balanced type direct current power supply system wiring structure, which meets the requirements of reliability, safety and flexibility of small power system direct current system.
[0004] The utility model discloses a symmetrical balanced type direct current power supply system wiring structure, which comprises a first battery pack and a second battery pack.
[0005] A symmetrical balanced type direct current power supply system wiring structure, comprising a first battery pack and a second battery pack, wherein the first battery pack is connected with a first charging device, and the second battery pack is connected with a second charging device; the first battery pack and the second battery pack are connected to a busbar through a first intelligent circuit breaker and a second intelligent circuit breaker respectively.
[0006] The first charging device is connected with the first battery pack through a first charging switch, and the second charging device is connected with the second battery pack through a second charging switch.
[0007] The first battery pack and the second battery pack are both valve-regulated lead-acid batteries or lithium iron phosphate batteries.
[0008] An insulation monitoring device and a battery state monitoring device are further arranged on the busbar.
[0009] The first charging device and the second charging device are both connected with a centralized monitor, and the centralized monitor is also connected to the busbar.
[0010] The first battery pack and the second battery pack are both connected with a voltmeter and an ammeter, and the first charging device and the second charging device are both connected with an ammeter.
[0011] The utility model discloses a symmetrical balanced type direct current power supply system wiring structure, which meets the requirements of reliability, safety and flexibility of small power system direct current system. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The utility model discloses a schematic diagram. DETAILED DESCRIPTION
[0013] The utility model is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the utility model and actual conditions.
[0014] As Figure 1 The utility model discloses a symmetrical balanced type direct current power supply system wiring structure, including first battery group 1 and second battery group 2, wherein, first battery group 1 connects first charging device 3, and second battery group 2 connects second charging device 4, first battery group 1 and second battery group 2 are connected to busbar 6 through first intelligent circuit breaker 5 and second intelligent circuit breaker 9 respectively, in this way, the utility model adopts the single bus wiring mode of double sets of batteries and double sets of charging devices.
[0015] Further, first battery group 1 and second battery group 2 all adopt valve-regulated lead-acid battery or lithium iron phosphate battery.
[0016] Further, the busbar 6 is also provided with an insulation monitoring device and a battery state monitoring device.
[0017] Further, the first charging device 3 and the second charging device 4 are both connected to a centralized monitor, and the centralized monitor is also connected to the busbar 6, and the centralized monitor acquires battery monomer data.
[0018] Further, the first charging device 3 is connected to the first battery group 1 through a first charging switch 7, and the second charging device 4 is connected to the second battery group 2 through a second charging switch 8.
[0019] Further, the first battery group 1 and the second battery group 2 are both connected to a voltmeter and an ammeter, and the first charging device 3 and the second charging device 4 are both connected to an ammeter.
[0020] The working principle of the utility model is as follows:
[0021] (1) when the direct current system is normally operated, the first intelligent circuit breaker 5, the second intelligent circuit breaker 9 and the first charging switch 7 are all closed, the switch from the first charging device 3 to the first battery group 1 to the busbar 6 is in the closed state, and the first charging device 3 is responsible for floating charging the first battery group 1 and the second battery group 2.
[0022] (2) When the first battery group 1 needs to be equalized, the first intelligent circuit breaker 5 is opened, the first battery group 1 to the bus switch is in an open state, and the first battery group 1 is separated from the DC bus. The first charging switch 7 is closed, and the first charging device 3 outputs a voltage to equalize the voltage of the first battery group 1 to an equalization voltage. After equalization is completed, the voltage difference between the first battery group 1 and the bus voltage is determined. When the voltage difference is less than 5V, the first charging switch 7 is opened, the first intelligent circuit breaker 5 is closed, and the first battery group 1 is returned to the DC bus. When the first battery group 1 is equalized, the second intelligent circuit breaker 9 is closed, and the second battery group 2 is ensured to be connected to the DC bus.
[0023] (3) When the second battery group 2 needs to be equalized, the first intelligent circuit breaker 5 and the first charging switch 7 are both closed, the first charging device 3 is still in a closed state through the first battery group and the bus switch; the second intelligent circuit breaker 9 is opened, and the second battery group 2 is separated from the DC bus; the second charging switch 8 is closed, and the second charging device 4 outputs a voltage to equalize the voltage of the second battery group 2 to an equalization voltage. After equalization is completed, whether the voltage difference between the second battery group 2 and the bus voltage is less than 5V is determined. When the voltage difference is less than 5V, the second charging switch 8 is opened, the second intelligent circuit breaker 9 is closed, and the second battery group 2 is returned to the DC bus.
[0024] (4) When the first battery group 1 / second battery group 2 is connected to the DC bus, the current measured by the current transformer on the two main circuits reaches the battery short-circuit current limit value and is in opposite directions at the same time, the second intelligent circuit breaker 9 of the second battery group 2 is opened, and the battery group on the short-circuit side is separated from the DC system.
[0025] The above is only a preferred embodiment of the present application, and is not a limitation on the technical scheme of the present application. It should be pointed out that those skilled in the art can make further improvements and changes under the premise of the technical scheme of the present application, and these improvements and changes should be covered in the protection scope of the present application.
Claims
1. A wiring structure for a symmetrical balanced DC power supply system, characterized in that: It comprises a first battery (1) and a second battery (2), wherein the first battery (1) is connected with a first charging device (3), and the second battery (2) is connected with a second charging device (4); the first battery (1) and the second battery (2) are connected to a bus (6) through a first intelligent circuit breaker (5) and a second intelligent circuit breaker (9) respectively; The first charging device (3) is connected with the first battery (1) through a first charging switch (7); the second charging device (4) is connected with the second battery (2) through a second charging switch (8).
2. The symmetrical balanced DC power supply system connection structure according to claim 1, characterized in that: The first battery (1) and the second battery (2) are both valve-regulated lead-acid batteries or lithium iron phosphate batteries.
3. The symmetrical balanced DC power system connection structure according to claim 1, characterized in that: An insulation monitoring device and a battery state monitoring device are arranged on the bus (6).
4. The symmetrical balanced DC power system wiring structure of claim 1, wherein: The first charging device (3) and the second charging device (4) are both connected with a centralized monitor, and the centralized monitor is also connected to the bus (6).
5. The symmetrical balanced DC power system wiring structure according to claim 1, characterized in that: The first battery (1) and the second battery (2) are both connected with a voltmeter and an ammeter; the first charging device (3) and the second charging device (4) are both connected with an ammeter.