Carbon-based capacitor energy storage experimental device capable of operating off-grid

Abstract

The utility model relates to a carbon-based capacitor energy storage experimental device capable of operating off-grid, which comprises an isolation transformer, a first current transformer, a second current transformer, a first carbon-based capacitor battery pack, a second carbon-based capacitor battery pack, a direct current contactor and a charging device, the first converter is further connected with the first carbon-based capacitor battery pack, the second converter is further connected with the second carbon-based capacitor battery pack, and a branch is further branched from a connecting line of the second converter and the second carbon-based capacitor battery pack and is connected with the electricity supplementing device through a direct-current contactor. Compared with the prior art, based on off-grid operation, charging and discharging experiments can be carried out through the charging device and the two carbon-based capacitor battery packs, and the device has the advantages of being convenient to operate, high in anti-interference capability, safe, guaranteed and the like.

Description

Technical Field

[0001] The utility model relates to the field of carbon-based capacitor experimental devices, and in particular to a carbon-based capacitor energy storage experimental device that can operate off-grid. Background Technique

[0002] Carbon-based capacitors simultaneously possess the characteristics of large-rate charge and discharge of capacitors and the large-capacity electricity storage ability of batteries, and have a series of unique advantages such as long cycle life, good safety, high reliability, fast charging speed, good high and low temperature resistance characteristics, maintenance-free, green environmental protection and pollution-free, and the lowest full-life cycle cost. They have significant potential application values in energy storage systems for large-scale photovoltaic conversion and wind power generation; intelligent power grids, power plant frequency modulation and peak shaving systems, micro-grid energy storage battery systems, and as energy storage systems in remote areas; accident standby power supply systems and uninterruptible power supplies for power grids and power stations; mobile operator base stations and data centers; municipal transportation, and military fields.

[0003] Although carbon-based capacitors have unique advantages in high-power energy storage application scenarios, they have not been commercialized on a large scale due to cost and technical bottlenecks, and are currently only widely used in individual fields. As an emerging energy storage technology, the application of carbon-based capacitor energy storage in multiple scenarios is still in the exploratory test stage, and existing capacitor energy storage experimental test devices basically need to be connected to the power grid for online testing. During the testing process, they are restricted by the operation of the power grid and may affect the normal operation of the power grid, making testing inconvenient. Therefore, there is an urgent need for a carbon-based capacitor energy storage experimental system that can operate off-grid to verify the performance of carbon-based capacitor energy storage in different application scenarios. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the above-mentioned existing technologies and provide a carbon-based capacitor energy storage experimental device that can operate off-grid, improve the operability of the system, bring convenience to experimental personnel, and at the same time can further verify the operating performance of the carbon-based capacitor energy storage system in an off-grid environment.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A carbon-based capacitor energy storage experimental device that can operate off-grid includes an isolation transformer, a first converter, a second converter, a first carbon-based capacitor battery pack, a second carbon-based capacitor battery pack, a DC contactor, and a charging device. The first converter and the second converter are connected to each other through the isolation transformer. The first converter is also connected to the first carbon-based capacitor battery pack, and the second converter is also connected to the second carbon-based capacitor battery pack. A branch is also separated from the connection line between the second converter and the second carbon-based capacitor battery pack and connected to the charging device through the DC contactor.

[0007] Further, both the first converter and the second converter include a circuit breaker, a current transformer, an AC EMC filter, a bidirectional power control component, a DC EMC filter, and a fuse. The circuit breaker, the current transformer, the AC EMC filter, the bidirectional power control component, the DC EMC filter, and the fuse are connected in series in sequence. The bidirectional power control component is a bidirectional power control component with bidirectional power control to switch between the rectification mode and the inversion mode. In the rectification mode, it charges the first carbon-based capacitor battery pack or the second carbon-based capacitor battery pack. In the inversion mode, the first carbon-based capacitor battery pack or the second carbon-based capacitor battery pack discharges.

[0008] Further, the bidirectional power control component includes a three-phase full-bridge circuit, a rectifier, and an inverter. The three-phase full-bridge circuit is a three-phase full-bridge circuit with a current direction switching function. The three-phase full-bridge circuit is respectively switched and connected to the rectifier and the inverter.

[0009] Further, both the first converter and the second converter also include an AC side lightning arrester and a DC side lightning arrester. Both the AC side lightning arrester and the DC side lightning arrester are lightning arresters with overvoltage surge protection. The AC side lightning arrester is connected to the connection line between the circuit breaker and the isolation transformer, and the DC side lightning arrester is connected to the connection line between the DC EMC filter and the fuse.

[0010] Further, both the AC side lightning arrester and the DC side lightning arrester are grounded.

[0011] Further, the current transformer is a current transformer with the function of converting large current in the line into small current and measuring the current magnitude.

[0012] Further, both the AC EMC filter and the DC EMC filter are EMC filters with the function of suppressing electromagnetic interference and spark interference.

[0013] Further, the circuit breaker is a circuit breaker with short-circuit fusing and isolation function.

[0014] Further, the output connection line of the DC EMC filter is divided into two branches and respectively connected to both ends of the first carbon-based capacitor battery pack or the second carbon-based capacitor battery pack. The number of fuses is multiple, and they are respectively connected in series in the connection branches between the DC EMC filter and the first carbon-based capacitor battery pack or the second carbon-based capacitor battery pack.

[0015] Further, both the first carbon-based capacitor battery pack and the second carbon-based capacitor battery pack are battery arrays formed by paralleling multiple carbon-based capacitor modules.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] (1) In this solution, the first carbon-based capacitor battery pack and the second carbon-based capacitor battery pack are respectively connected to the first inverter and the second inverter. The first inverter and the second inverter are used for current protection and charge-discharge switching control of the carbon-based capacitor battery packs. The first inverter and the second inverter are interconnected through an isolation transformer to achieve electrical isolation. The two inverters and the carbon-based capacitor battery packs are interconnected to achieve the setting of mutual charge-discharge switching, enabling the off-grid operation of the carbon-based capacitor energy storage experimental device. And through the power supply replenishment device, charge-discharge experiments are carried out with the two carbon-based capacitor battery packs, which can improve the operability of the system, bring convenience to experimental personnel, and at the same time further verify the operating performance of the carbon-based capacitor energy storage system in an off-grid environment.

[0018] (2) In the first inverter and the second inverter of this solution, EMC filters are arranged on both the AC and DC sides, further improving the anti-interference ability of the device and providing a good foundation for providing accurate experimental data. At the same time, lightning arresters are configured on both the AC and DC sides, providing reliable protection for the safety of the system. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a carbon-based capacitor energy storage experimental device capable of off-grid operation provided in an embodiment of the present invention;

[0020] In the figure, 1. Isolation transformer, 2. First inverter, 3. Second inverter, 4. First AC-side lightning arrester, 5. Second AC-side lightning arrester, 6. First circuit breaker, 7. Second circuit breaker, 8. First current transformer, 9. Second current transformer, 10. First AC EMC filter, 11. Second AC EMC filter, 12. First bidirectional power control component, 13. Second bidirectional power control component, 14. First DC EMC filter, 15. Second DC EMC filter, 16. First DC-side lightning arrester, 17. Second DC-side lightning arrester, 18. First fuse, 19. Second fuse, 20. DC contactor, 21. Power supply replenishment device, 22. First carbon-based capacitor battery pack, 23. Second carbon-based capacitor battery pack. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0022] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0023] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0025] Embodiment 1

[0026] As Figure 1 shown, this embodiment provides a carbon-based capacitor energy storage experimental device that can operate off-grid, including an isolation transformer 1, a first converter 2, a second converter 3, a first carbon-based capacitor battery pack 22, a second carbon-based capacitor battery pack 23, a DC contactor 20, and a charging device 21. The first converter 2 and the second converter 3 are connected to each other through the isolation transformer 1. The first converter 2 is also connected to the first carbon-based capacitor battery pack 22, and the second converter 3 is also connected to the second carbon-based capacitor battery pack 23. A branch is also separated from the connection line of the second converter 3 and the second carbon-based capacitor battery pack 23 and is connected to the charging device 21 through the DC contactor 20.

[0027] The isolation transformer 1 is used for electrical isolation of the first converter 2 and the second converter 3;

[0028] The DC contactor 20 is used to control the connection of the charging device 21 to the DC side line;

[0029] The charging device 21 can charge the second carbon-based capacitor battery pack 23 independently;

[0030] Both the first carbon-based capacitor battery pack 22 and the second carbon-based capacitor battery pack 23 are battery arrays formed by connecting a plurality of carbon-based capacitor modules in parallel.

[0031] In this solution, the first carbon-based capacitor battery pack 22 and the second carbon-based capacitor battery pack 23 are respectively connected to the first inverter 2 and the second inverter 3. The first inverter 2 and the second inverter 3 are used for current protection and charge-discharge switching control of the carbon-based capacitor battery packs. The first inverter 2 and the second inverter 3 are interconnected through an isolation transformer 1 to achieve electrical isolation. The two inverters and the carbon-based capacitor battery packs are interconnected to achieve the setting of mutual charge-discharge switching, enabling the off-grid operation of the carbon-based capacitor energy storage experimental device. And through the charging device 21, charge-discharge experiments are carried out with the two carbon-based capacitor battery packs, which can improve the operability of the system, bring convenience to experimental personnel, and at the same time can further verify the operating performance of the carbon-based capacitor energy storage system in an off-grid environment.

[0032] Specifically, the first inverter 2 includes a first circuit breaker 6, a first current transformer 8, a first AC EMC filter 10, a first bidirectional power control component 12, a first DC EMC filter 14, and a first fuse 18 connected in series in sequence;

[0033] The second inverter 3 includes a second circuit breaker 7, a second current transformer 9, a second AC EMC filter 11, a second bidirectional power control component 13, a second DC EMC filter 15, and a second fuse 19 connected in series in sequence;

[0034] The first circuit breaker 6 and the second circuit breaker 7 are used to achieve local fault isolation by fuse fusing when a short circuit occurs in the carbon-based capacitor battery pack.

[0035] Preferably, the first inverter 2 further includes a first AC side lightning arrester 4 and a first DC side lightning arrester 16. The first AC side lightning arrester 4 is connected to the connection line between the first circuit breaker 6 and the isolation transformer 1, and the first DC side lightning arrester 16 is connected to the connection line between the first DC EMC filter 14 and the first fuse 18;

[0036] The second inverter 3 further includes a second AC side lightning arrester 5 and a second DC side lightning arrester 17. The second AC side lightning arrester 5 is connected to the connection line between the second circuit breaker 7 and the isolation transformer 1, and the second DC side lightning arrester 17 is connected to the connection line between the second DC EMC filter 15 and the second fuse 19;

[0037] The first AC side lightning arrester 4 and the second AC side lightning arrester 5 are used to protect against overvoltage surges on the AC side; the first DC side lightning arrester 16 and the second DC side lightning arrester 17 are used to protect against overvoltage surges on the DC side.

[0038] The first AC side lightning arrester 4, the second AC side lightning arrester 5, the first DC side lightning arrester 16, and the second DC side lightning arrester 17 are all grounded.

[0039] The first current transformer 8 and the second current transformer 9 are used to convert the large current in the line into a small current and for accurately measuring the magnitude of the current;

[0040] The first AC EMC filter 10, the first DC EMC filter 14, the second AC EMC filter 11 and the second DC EMC filter 15 are all used to suppress the strong electromagnetic interference and spark interference during charge and discharge, and improve the anti-interference ability of the system.

[0041] The first bidirectional power control component 12 and the second bidirectional power control component 13 are both bidirectional power control components with bidirectional power control to switch between the rectification mode and the inversion mode. In the rectification mode, the first carbon-based capacitor battery pack 22 or the second carbon-based capacitor battery pack 23 is charged; in the inversion mode, the first carbon-based capacitor battery pack 22 or the second carbon-based capacitor battery pack 23 discharges.

[0042] The bidirectional power control component includes a three-phase full-bridge circuit, a rectifier and an inverter. The three-phase full-bridge circuit is used to realize the bidirectional power control between the carbon-based capacitor battery pack and the power grid. The rectification mode is realized through the rectifier, or the inversion mode is realized through the inverter. In the rectification mode, the carbon-based capacitor battery pack is charged, and in the inversion mode, the carbon-based capacitor battery pack discharges to the load or the power grid;

[0043] The first fuse 18 and the second fuse 19 are used to disconnect and isolate the fault point in time when overcurrent occurs on the DC side during the charge and discharge process, and improve the safety of the system.

[0044] During the use of the above off-grid operating carbon-based capacitor energy storage experimental device, the second carbon-based capacitor battery pack 23 can be charged through the power supply replenishment device 21. After the charging is completed, the inversion mode is realized through the second bidirectional power control component 13, and the first carbon-based capacitor battery pack 22 is charged through the second converter 3, the isolation transformer 1 and the first converter 2. After the first carbon-based capacitor battery pack 22 is charged, through the control of the first bidirectional power control component 12 and the second bidirectional power control component 13, the first carbon-based capacitor battery pack 22 can be discharged and the second carbon-based capacitor battery pack 23 can be charged, thereby performing charge and discharge experiments on the two carbon-based capacitor battery packs, realizing off-grid operation, improving the operability of the system, and bringing convenience to the experimental personnel.

[0045] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A carbon-based capacitor energy storage experimental device capable of off-grid operation, characterized in that: The invention comprises an isolation transformer (1), a first converter (2), a second converter (3), a first carbon-based capacitor battery group (22), a second carbon-based capacitor battery group (23), a DC contactor (20) and a power compensation device (21), wherein the first converter (2) and the second converter (3) are connected to each other via the isolation transformer (1), the first converter (2) is also connected to the first carbon-based capacitor battery group (22), the second converter (3) is also connected to the second carbon-based capacitor battery group (23), and a branch is branched from the connection line between the second converter (3) and the second carbon-based capacitor battery group (23) to connect to the power compensation device (21) via the DC contactor (20).

2. According to claim 1, a carbon-based capacitor energy storage experimental device capable of off-grid operation is characterized in that: The first converter (2) and the second converter (3) both comprise a circuit breaker, a current transformer, an AC EMC filter, a bidirectional power control component, a DC EMC filter and a fuse, wherein the circuit breaker, the current transformer, the AC EMC filter, the bidirectional power control component, the DC EMC filter and the fuse are sequentially connected in series; the bidirectional power control component is a bidirectional power control component having bidirectional power control for switching between a rectification mode and an inversion mode; in the rectification mode, the first carbon-based capacitor battery group (22) or the second carbon-based capacitor battery group (23) is charged; in the inversion mode, the first carbon-based capacitor battery group (22) or the second carbon-based capacitor battery group (23) is discharged.

3. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The bidirectional power control component includes a three-phase full-bridge circuit, a rectifier and an inverter. The three-phase full-bridge circuit is a three-phase full-bridge circuit with a current direction switching function; the three-phase full-bridge circuit switches and connects the rectifier and the inverter respectively.

4. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The first converter (2) and the second converter (3) both further include an AC side lightning arrester and a DC side lightning arrester, both of which are lightning arresters capable of protecting against overvoltage surges, the AC side lightning arrester being connected to a connection line between the circuit breaker and the isolation transformer (1), and the DC side lightning arrester being connected to a connection line between the DC EMC filter and the fuse.

5. The off-grid carbon-based capacitor energy storage experimental device according to claim 4, characterized in that: The AC side lightning arrester and the DC side lightning arrester are both grounded.

6. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The current transformer is a current transformer with the functions of converting a large current in a line into a small current and measuring the magnitude of the current.

7. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The AC EMC filter and the DC EMC filter are both EMC filters capable of suppressing electromagnetic interference and electric spark interference.

8. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The circuit breaker is a circuit breaker with a short-circuit fusing and isolating function.

9. The off-grid carbon-based capacitor energy storage experimental device according to claim 2, characterized in that: The output end connection circuit of the DC EMC filter is divided into two branches respectively connected to two ends of the first carbon-based capacitor battery group (22) or the second carbon-based capacitor battery group (23); the number of the fuses is multiple and they are respectively connected in series in the connection branches between the DC EMC filter and the first carbon-based capacitor battery group (22) or the second carbon-based capacitor battery group (23).

10. The off-grid carbon-based capacitor energy storage experimental device according to claim 1, characterized in that: The first carbon-based capacitor battery group (22) and the second carbon-based capacitor battery group (23) are both battery arrays formed by connecting a plurality of carbon-based capacitor modules in parallel.

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