CN220586243U - Direct current short circuit breaking combiner box - Google Patents
Direct current short circuit breaking combiner box Download PDFInfo
- Publication number
- CN220586243U CN220586243U CN202321905143.8U CN202321905143U CN220586243U CN 220586243 U CN220586243 U CN 220586243U CN 202321905143 U CN202321905143 U CN 202321905143U CN 220586243 U CN220586243 U CN 220586243U
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- inverter
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- direct current
- data acquisition
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- 238000012544 monitoring process Methods 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 14
- 239000004973 liquid crystal related substance Substances 0.000 claims description 8
- 238000013480 data collection Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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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- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a direct current short circuit breaking combiner box which comprises a data acquisition device, an inverter and a plurality of combiner box bodies connected with photovoltaic cells, wherein the inverter comprises an inverter circuit, a disconnecting switch and a diode, the diode is connected in parallel to one side of the inverter circuit, one connecting end of the diode and one connecting end of the inverter circuit are connected with one end of the disconnecting switch, and one end of each combiner box body is connected with a fuse.
Description
Technical Field
The utility model relates to the technical field of photovoltaic equipment, in particular to a direct current short-circuit breaking combiner box.
Background
One of the devices commonly found in photovoltaic projects is a combiner box, which is typically mounted at the end of a photovoltaic array formed by the photovoltaic panels, for collecting and combining the dc electrical energy generated by the photovoltaic panels. The interior of the junction box contains a plurality of dc input terminals for connecting the dc power of the battery panel to the dc output lines within the junction box. Meanwhile, the combiner box further comprises protection devices, such as a short-circuit protector and an overcurrent protector, and the protection devices are used for protecting the photovoltaic cell panel and the photovoltaic cell system from faults such as short circuits, overcurrent and the like. The combiner box can also provide monitoring and remote control functions for the photovoltaic cell panel assembly so as to monitor and manage the operation state of the photovoltaic system.
At present, a dc cable short-circuit junction box on the market cannot normally perform dc short-circuit breaking, so that component energy is continuously injected into a short-circuit point through an inverter, and an inverter accident is caused, and therefore, we need to propose a dc short-circuit breaking junction box to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to provide a direct current short-circuit breaking combiner box, which can ensure the reliable breaking of an alternating current switch under the full-range short-circuit current through the matching of a contactor and a breaker, thereby reducing the occurrence probability of an inverter accident and solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a direct current short circuit divides disconnected collection flow box, includes data collection station, dc-to-ac converter and a plurality of collection flow box body of being connected with photovoltaic cell, the dc-to-ac converter includes inverter circuit, isolator and diode, the diode is parallelly connected in one side of inverter circuit, one of them link and the isolator one end of diode and inverter circuit are connected, every the one end of collection flow box body is connected with the fuse, the other end of isolator and the other link of diode and inverter circuit are all connected with the one end of fuse, inverter circuit's opposite side is connected with the contactor, the one end of contactor is connected with the circuit breaker, be connected with 24V's shunt release on the circuit breaker, the one end of circuit breaker is connected with data collection station's one end, form two short circuit return circuits when the dc-to-ac energy forms through collection flow box body, cable and short circuit point, and another short circuit return is that ac energy passes through circuit breaker, contactor, diode, direct current shape and short circuit point form.
Preferably, the inverter circuit comprises three groups of inverter bridge arms, the three groups of inverter bridge arms are arranged in parallel, each group of inverter bridge arms is composed of two switching tubes which are arranged in series, the connecting ends of the two switching tubes are connected with an inductor L, and one end of the inductor L is connected with one end of a contactor.
Preferably, the data acquisition device comprises a main control unit, a communication unit capable of RS485 communication and a data acquisition unit, wherein the main control unit is electrically connected with the communication unit and the data acquisition unit respectively.
Preferably, the main control unit comprises a microprocessor and a memory, and the memory is electrically connected with the microprocessor.
Preferably, the communication unit comprises an RS485 receiving and transmitting chip, a driving circuit and an RS485 interface, and the RS485 receiving and transmitting chip is respectively connected with the driving circuit and the RS485 interface.
Preferably, the data acquisition unit comprises a temperature sensor, a voltage monitoring sensor and a current monitoring sensor, wherein the voltage monitoring sensor, the current monitoring sensor and the temperature sensor are all connected with the microprocessor.
Preferably, the photovoltaic area monitoring system further comprises a photovoltaic area monitoring module, wherein the photovoltaic area monitoring module comprises a liquid crystal screen, and an alarm is arranged on one side of the liquid crystal screen.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, through the cooperation of the data acquisition device, the inverter and the combiner box body, after the inverter detects that a direct current short circuit fault occurs, the data acquisition device receives a fault signal, and then widely broadcasts and issues breaking instructions of the circuit breakers to all combiner boxes in the square matrix through an RS485 bus mode, and after the combiner box body receives the instructions, the circuit breakers are controlled to break, and the reliable breaking of the alternating current switch under the full-range short circuit current can be ensured through the cooperation of the contactor and the circuit breakers, so that the occurrence probability of the inverter accident is reduced.
Drawings
FIG. 1 is a system block diagram of the present utility model;
FIG. 2 is a circuit diagram of the present utility model;
fig. 3 is a circuit diagram of the shunt release connection of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present utility model provides a technical solution: the utility model provides a direct current short circuit divides disconnected collection flow box, includes data collection station, dc-to-ac converter and a plurality of collection flow box body of being connected with photovoltaic cell, the dc-to-ac converter includes inverter circuit, isolator and diode, the diode is parallelly connected in one side of inverter circuit, one of them link and the isolator one end of diode and inverter circuit are connected, every the one end of collection flow box body is connected with the fuse, the other end of isolator and the other link of diode and inverter circuit are all connected with the one end of fuse, inverter circuit's opposite side is connected with the contactor, the one end of contactor is connected with the circuit breaker, be connected with 24V's shunt release on the circuit breaker, the one end of circuit breaker is connected with data collection station's one end, two short circuit return circuits are formed to the dc energy when the dc-to-ac converter is operated, and this short circuit return circuit is direct current short circuit return, and another short circuit return is that the ac energy is through circuit breaker, contactor, diode, direct current shape and short circuit return circuit.
Through installing the shunt release of 24V additional on the circuit breaker, make data acquisition ware according to collection flow box body monitoring communication protocol configuration issue remote control instruction, realize monitoring module control circuit breaker and release, can guarantee the reliable breaking of alternating current switch under the full range short-circuit current through the cooperation of contactor and circuit breaker to reduce the probability of dc-to-ac converter occurence of failure.
In the dc short-circuit loop, it is assumed that the inverter has 8 combiner boxes, and at this time, the energy of the other 7 combiner boxes will all flow to the short-circuit point, the short-circuit current depends on the short-circuit current of the corresponding components of the 7 combiner boxes, and the large current flows through the fuse and the dc cable of the short-circuit branch.
In the ac short circuit loop, the characteristics under the ac short circuit condition are as follows:
1. the bus bar falls;
2. the three-phase overcurrent can reach more than 10000A;
3. the cable short circuit branch circuit can generate reverse current, and the magnitude of the reverse current depends on short circuit impedance;
after detecting the abnormality, the inverter is defined as the occurrence of a direct-current side short circuit, and the following protection action is performed.
The inverter circuit comprises three groups of inverter bridge arms, the three groups of inverter bridge arms are arranged in parallel, each group of inverter bridge arms consists of two switching tubes which are arranged in series, the connecting ends of the two switching tubes are connected with an inductor L, and one end of the inductor L is connected with one end of a contactor.
When the inverter is subjected to breaking protection, the inverter alternating current switch is firstly broken, then the inverter direct current switch is broken, and finally the junction box body output circuit breaker is broken, and the method specifically comprises the following steps:
the first step: breaking an inverter alternating current switch: the short circuit loop forms alternating current and increases instantaneously, the data collector detects two or more phases of overcurrent pulses at the same time, and the pulse width is more than or equal to 1ms, so that the short circuit fault is considered to occur, the microprocessor seals the drive, latches the fault bit, and breaks the contactor after the microprocessor reads the fault to cut off the alternating current short circuit loop.
If the instantaneous value of the short-circuit current does not reach 6000A at the moment, the contactor is normally disconnected, the breaker cannot be disconnected, and the disconnection time of the contactor is 70ms at the maximum;
if the short-circuit current exceeds 6000A instantaneously, the circuit breaker triggers quick-action 30ms to break at first, and the contactor can be damaged beyond the short-circuit breaking capacity at the moment because the action time of the contactor is 33ms-70ms, and the contactor can not be damaged, and the short-circuit current and the breaking state of the contactor are dependent;
the reliable breaking of the alternating current switch under the full-range short-circuit current can be ensured through the matching of the contactor and the circuit breaker, and the total protection time is between 30ms and 70 ms.
And a second step of: breaking inverter direct current switch: under the condition of ensuring the disconnection of the alternating current switch, the direct current isolating switch is safely disconnected, and the action time of the direct current isolating switch is about 40ms or less.
And a third step of: breaking junction box output breaker: in order to thoroughly cut off the energy of the direct current side, the direct current combiner box output breaker is cut off through RS485 communication while the direct current switch of the inverter is cut off.
The data acquisition device comprises a main control unit, a communication unit capable of RS485 communication and a data acquisition unit, wherein the main control unit is electrically connected with the communication unit and the data acquisition unit respectively, the data acquisition device is in data interaction with the inverter and the busbar box body in the square matrix, the data acquisition device is used for reporting the data acquisition device through the liquid crystal display after the inverter detects that a direct current short circuit fault occurs and latching the fault for more than 30 seconds, the data acquisition device receives a fault signal, the data acquisition device transmits a breaker breaking instruction to all the busbar box bodies in the square matrix in a broadcasting mode through an RS485 bus mode, and the breaker is controlled to break after the busbar box receives the instruction.
The main control unit comprises a microprocessor and a memory, wherein the memory is electrically connected with the microprocessor, and the microprocessor is set to be a Cortex-M4 processor.
The communication unit comprises an RS485 receiving and transmitting chip, a driving circuit and an RS485 interface, and the RS485 receiving and transmitting chip is respectively connected with the driving circuit and the RS485 interface.
The data acquisition unit comprises a temperature sensor, a voltage monitoring sensor and a current monitoring sensor, and the voltage monitoring sensor, the current monitoring sensor and the temperature sensor are all connected with the microprocessor.
The system comprises an inverter, a photovoltaic area monitoring module, a power supply module and a power supply module, wherein the photovoltaic area monitoring module comprises a liquid crystal screen, an alarm is arranged on one side of the liquid crystal screen, and after the liquid crystal screen monitors that a short circuit fault alarm signal occurs in the inverter, a corresponding event record needs to be stored, so that event storage of the short circuit fault needs to be newly added; in order to accurately monitor the occurrence of short-circuit faults, the photovoltaic area monitoring system needs to increase the alarm signal of the whole inverter 'short-circuit faults', and the alarm signal is replaced by the alarm signal of the 'short-circuit faults' because the point table of the data collector in the current square matrix and the photovoltaic area monitoring system is determined, so that the workload of technical improvement is reduced, the occurrence probability of the alarm signal of the 'environment temperature is extremely low' in combination with the actual environment of the site.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. Direct current short circuit divides disconnected collection flow box, including data acquisition ware, dc-to-ac converter and a plurality of collection flow box body of being connected with photovoltaic cell, its characterized in that: the inverter comprises an inverter circuit, isolating switches and diodes, wherein the diodes are connected in parallel to one side of the inverter circuit, one connecting end of each diode is connected with one end of each isolating switch, one end of each busbar box body is connected with a fuse, the other end of each isolating switch and the other connecting end of each diode and the inverter circuit are connected with one end of each fuse, the other side of each inverter circuit is connected with a contactor, one end of each contactor is connected with a circuit breaker, a 24V shunt release is connected to each circuit breaker, one end of each circuit breaker is connected with one end of a data acquisition device, two short-circuit loops are formed when the inverter runs, one short-circuit loop is formed by direct-current energy through the busbar box body, a cable and a short-circuit point, and the other short-circuit loop is formed by alternating-current energy through the circuit breakers, the contactors, the diodes, the direct-current shapes and the short-circuit points.
2. The direct current short circuit breaking combiner box according to claim 1, wherein: the inverter circuit comprises three groups of inverter bridge arms, the three groups of inverter bridge arms are arranged in parallel, each group of inverter bridge arms consists of two switching tubes which are arranged in series, the connecting ends of the two switching tubes are connected with an inductor L, and one end of the inductor L is connected with one end of a contactor.
3. The direct current short circuit breaking combiner box according to claim 1, wherein: the data acquisition device comprises a main control unit, a communication unit capable of RS485 communication and a data acquisition unit, wherein the main control unit is electrically connected with the communication unit and the data acquisition unit respectively.
4. A direct current short circuit breaking combiner box according to claim 3, wherein: the main control unit comprises a microprocessor and a memory, and the memory is electrically connected with the microprocessor.
5. The direct current short circuit breaking combiner box according to claim 4, wherein: the communication unit comprises an RS485 receiving and transmitting chip, a driving circuit and an RS485 interface, and the RS485 receiving and transmitting chip is respectively connected with the driving circuit and the RS485 interface.
6. The direct current short circuit breaking combiner box according to claim 5, wherein: the data acquisition unit comprises a temperature sensor, a voltage monitoring sensor and a current monitoring sensor, and the voltage monitoring sensor, the current monitoring sensor and the temperature sensor are all connected with the microprocessor.
7. The direct current short circuit breaking combiner box according to claim 6, wherein: the photovoltaic area monitoring system comprises a photovoltaic area monitoring module, wherein the photovoltaic area monitoring module comprises a liquid crystal screen, and an alarm is arranged on one side of the liquid crystal screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321905143.8U CN220586243U (en) | 2023-07-19 | 2023-07-19 | Direct current short circuit breaking combiner box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321905143.8U CN220586243U (en) | 2023-07-19 | 2023-07-19 | Direct current short circuit breaking combiner box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220586243U true CN220586243U (en) | 2024-03-12 |
Family
ID=90119803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321905143.8U Active CN220586243U (en) | 2023-07-19 | 2023-07-19 | Direct current short circuit breaking combiner box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220586243U (en) |
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2023
- 2023-07-19 CN CN202321905143.8U patent/CN220586243U/en active Active
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