CN221078901U - Photovoltaic power generation inverter direct current cabinet fault detection system - Google Patents
Photovoltaic power generation inverter direct current cabinet fault detection system Download PDFInfo
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- CN221078901U CN221078901U CN202322509199.8U CN202322509199U CN221078901U CN 221078901 U CN221078901 U CN 221078901U CN 202322509199 U CN202322509199 U CN 202322509199U CN 221078901 U CN221078901 U CN 221078901U
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- electrode busbar
- direct current
- power generation
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000010248 power generation Methods 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000012423 maintenance Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Inverter Devices (AREA)
Abstract
The utility model provides a photovoltaic power generation inverter direct current cabinet fault detection system, which comprises: a photovoltaic power generation device; the junction box is electrically connected with the photovoltaic power generation equipment; the direct-current cabinet is internally provided with a direct-current positive electrode busbar and a direct-current negative electrode busbar, and the combiner box is electrically connected with the direct-current positive electrode busbar and the direct-current negative electrode busbar; the inverter is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the lightning protection device is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the grounding detection equipment is electrically connected with the lightning protection device; and the communication cabinet is electrically connected with the grounding detection equipment.
Description
Technical Field
The utility model relates to the technical field of photovoltaic power generation, in particular to a fault detection system of a direct current cabinet of a photovoltaic power generation inverter.
Background
With the development of new energy power generation in China in recent years, photovoltaic power generation is more prominent, and the photovoltaic power generation is developed from previous flat-ground photovoltaic to mountain centralized photovoltaic and roof distributed photovoltaic power generation. The defects of mountain photovoltaic are obvious, namely reverse current is generated by the same branch circuit due to the influence of uneven terrain, and in addition, when a power station component fails (when the component has poor manufacturing or packaging technology, the salt spray resistance performance of the component is reduced after a period of operation, and internal short circuit is easily caused), the reverse current is also generated. In order to ensure the safe and stable operation of the inverter, an anti-reverse diode is additionally arranged at the direct current input end in the direct current cabinet to prevent the reverse current. The anti-reverse diode belongs to a vulnerable device, in the actual operation and maintenance work of a large-scale photovoltaic power station, operation and maintenance personnel need to break a breaker in a direct current cabinet to detect the grounding condition in the cabinet and the quality of the anti-reverse diode at regular intervals under the condition of not affecting power generation, the operation and maintenance workload is increased, and meanwhile, the power loss can be caused by daytime power failure detection.
In view of this, the present utility model has been made.
Disclosure of utility model
The invention aims to provide a fault detection system of a direct current cabinet of a photovoltaic power generation inverter, which is used for fault detection in photovoltaic power generation.
In order to solve the technical problems, the invention provides a photovoltaic power generation inverter direct current cabinet fault detection system, which comprises: a photovoltaic power generation device; the junction box is electrically connected with the photovoltaic power generation equipment; the direct-current cabinet is internally provided with a direct-current positive electrode busbar and a direct-current negative electrode busbar, and the combiner box is electrically connected with the direct-current positive electrode busbar and the direct-current negative electrode busbar; the inverter is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the lightning protection device is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the grounding detection equipment is electrically connected with the lightning protection device; and the communication cabinet is electrically connected with the grounding detection equipment.
Further, the ground detection apparatus includes: the sensor is arranged on the direct current positive electrode busbar and the direct current negative electrode busbar; the multiplexing switch is electrically connected with the sensor; the signal conversion module is electrically connected with the multi-way change-over switch; the A/D conversion module is electrically connected with the signal conversion module; the CPU is electrically connected with the A/D conversion module and is electrically connected with the communication cabinet through RS 485; the alarm module is electrically connected with the CPU; the LCD display screen is electrically connected with the CPU; and a keyboard electrically connected with the CPU.
Further, the sensor is a leakage current sensor.
Further, the multiplexing switch is an analog multiplexer.
Further, the signal conversion module is a programmable amplifier.
Further, the CPU is a singlechip with an A/D converter.
The invention provides a fault detection system of a direct current cabinet of a photovoltaic power generation inverter, which has the following beneficial effects:
1. The direct current positive electrode busbar and the direct current negative electrode busbar in the direct current cabinet are electrically connected with the grounding detection equipment through the lightning protection device, so that the grounding faults of the combiner box and the direct current cabinet can be detected, and the service life of the inverter is prolonged;
2. The ground fault detection equipment is electrically connected with the communication cabinet, fault signals can be sent to the background, so that the ground fault can be eliminated timely and accurately by operation and maintenance personnel, the workload of the operation and maintenance personnel is reduced, and the operation and maintenance level is improved.
Drawings
FIG. 1 is a block diagram of a photovoltaic power inverter DC cabinet fault detection system;
FIG. 2 is a block diagram of the ground fault detection device of FIG. 1;
Fig. 3 is a circuit diagram of the signal conversion module in fig. 2.
Detailed Description
The utility model provides a fault detection system of a direct current cabinet of a photovoltaic power generation inverter, which is used for fault detection in photovoltaic power generation.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A photovoltaic power generation inverter dc cabinet fault detection system, as shown in fig. 1, comprising: a photovoltaic power generation device; the junction box is electrically connected with the photovoltaic power generation equipment; the direct-current cabinet is internally provided with a direct-current positive electrode busbar and a direct-current negative electrode busbar, and the combiner box is electrically connected with the direct-current positive electrode busbar and the direct-current negative electrode busbar; the inverter is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the lightning protection device is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar; the grounding detection equipment is electrically connected with the lightning protection device; and the communication cabinet is electrically connected with the grounding detection equipment.
In this embodiment, the direct current positive busbar and the direct current negative busbar in the direct current cabinet are electrically connected with the ground detection device through the lightning protection device, so that the ground faults of the combiner box and the direct current cabinet can be detected, and the service life of the inverter is further prolonged; the ground fault detection equipment is electrically connected with the communication cabinet, fault signals can be sent to the background, so that the ground fault can be eliminated timely and accurately by operation and maintenance personnel, the workload of the operation and maintenance personnel is reduced, and the operation and maintenance level is improved.
In an alternative embodiment, as shown in fig. 2, the ground detection apparatus includes: the sensor is arranged on the direct current positive electrode busbar and the direct current negative electrode busbar; the multiplexing switch is electrically connected with the sensor; the signal conversion module is electrically connected with the multi-way change-over switch; the A/D conversion module is electrically connected with the signal conversion module; the CPU is electrically connected with the A/D conversion module and is electrically connected with the communication cabinet through RS 485; the alarm module is electrically connected with the CPU; the LCD display screen is electrically connected with the CPU; and a keyboard electrically connected with the CPU.
In an alternative embodiment, the sensor is a leakage current sensor.
In an alternative embodiment, the multiplexing switch is an analog multiplexer.
In this alternative embodiment, the analog multi-way switch may be composed of an analog switch and a channel control logic, where the analog switch is connected to one input signal by the control logic, so as to complete switching of one input signal.
In an alternative embodiment, the signal conversion module is a programmable amplifier.
In this alternative embodiment, the signal conversion module is a programmable amplifier, the circuit diagram of which is shown in fig. 3. The conversion of the magnification is achieved by controlling the closing of S1, S2, S3.
In an alternative embodiment, the CPU is a single-chip microcomputer with an a/D converter built in.
In this alternative embodiment, the CPU is a single-chip microcomputer with an a/D converter built in, that is, the a/D conversion module and the CPU are one module.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model, and therefore the utility model is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides a photovoltaic power generation dc-to-ac converter direct current cabinet fault detection system which characterized in that includes:
A photovoltaic power generation device;
the junction box is electrically connected with the photovoltaic power generation equipment;
The direct-current cabinet is internally provided with a direct-current positive electrode busbar and a direct-current negative electrode busbar, and the combiner box is electrically connected with the direct-current positive electrode busbar and the direct-current negative electrode busbar;
The inverter is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar;
The lightning protection device is electrically connected with the direct current positive electrode busbar and the direct current negative electrode busbar;
the grounding detection equipment is electrically connected with the lightning protection device; and
And the communication cabinet is electrically connected with the grounding detection equipment.
2. The system according to claim 1, wherein the ground detection device comprises:
The sensor is arranged on the direct current positive electrode busbar and the direct current negative electrode busbar;
The multiplexing switch is electrically connected with the sensor;
the signal conversion module is electrically connected with the multi-way change-over switch;
The A/D conversion module is electrically connected with the signal conversion module;
The CPU is electrically connected with the A/D conversion module and is electrically connected with the communication cabinet through RS 485;
The alarm module is electrically connected with the CPU;
the LCD display screen is electrically connected with the CPU; and
And the keyboard is electrically connected with the CPU.
3. The system of claim 2, wherein the sensor is a leakage current sensor.
4. The system of claim 2, wherein the multiplexer is an analog multiplexer.
5. The system of claim 2, wherein the signal conversion module is a programmable amplifier.
6. The system for detecting faults of a photovoltaic power generation inverter direct current cabinet according to claim 2, wherein the CPU is a single chip microcomputer with an A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322509199.8U CN221078901U (en) | 2023-09-15 | 2023-09-15 | Photovoltaic power generation inverter direct current cabinet fault detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322509199.8U CN221078901U (en) | 2023-09-15 | 2023-09-15 | Photovoltaic power generation inverter direct current cabinet fault detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221078901U true CN221078901U (en) | 2024-06-04 |
Family
ID=91274438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322509199.8U Active CN221078901U (en) | 2023-09-15 | 2023-09-15 | Photovoltaic power generation inverter direct current cabinet fault detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221078901U (en) |
-
2023
- 2023-09-15 CN CN202322509199.8U patent/CN221078901U/en active Active
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