CN215120723U - Direct current collection flow box and photovoltaic system - Google Patents
Direct current collection flow box and photovoltaic system Download PDFInfo
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- CN215120723U CN215120723U CN202121280394.2U CN202121280394U CN215120723U CN 215120723 U CN215120723 U CN 215120723U CN 202121280394 U CN202121280394 U CN 202121280394U CN 215120723 U CN215120723 U CN 215120723U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a direct current collection flow box and photovoltaic system is applied to photovoltaic power generation technical field, and this direct current collection flow box is including the disjunction device who is provided with multicomponent broken circuit, and at least one photovoltaic module is connected to arbitrary component broken circuit's input, and each disjunction circuit's output links to each other with the change of current circuit respectively, and each component broken circuit is in the off-state under the condition of receiving preset protection signal, consequently, can realize the protect function who is realized by the fuse among the prior art through the disjunction device. The utility model provides a direct current collection flow box under the prerequisite that realizes the original protect function of fuse, uses the breaker to replace the fuse that uses among the prior art, effectively reduces the volume of direct current collection flow box, and then reduces the hardware cost of direct current collection flow box, simultaneously, can also reduce direct current collection flow box inside ambient temperature, helps improving the life of direct current collection flow box.
Description
The present application claims priority from the chinese patent application entitled "a dc combiner box and photovoltaic system" filed by the chinese patent office at 16/03/2021 with application number 202120547511.0, the entire contents of which are incorporated herein by reference.
Technical Field
The utility model relates to a photovoltaic power generation technical field, in particular to direct current collection flow box and photovoltaic system.
Background
The direct current combiner box is direct current combining equipment widely used in a photovoltaic system at present, and mainly has the main function of combining output currents of all photovoltaic modules in the photovoltaic system, outputting the combined output currents to a subsequent converter circuit, such as a DC/AC inverter circuit, converting direct currents into alternating currents through the DC/AC inverter circuit, and inputting the alternating currents into a public power grid.
In the prior art, the dc combiner box basically comprises a fuse set and a combiner switch, wherein the fuse set comprises a plurality of fuses, when the photovoltaic module is connected with the dc combiner box, the photovoltaic module is firstly connected with the fuses, a fuse is also required to be connected to the anode and the cathode of each photovoltaic module, and then each fuse is connected with the combiner switch.
Because often include a plurality of photovoltaic module among the photovoltaic system, each photovoltaic module all corresponds two fuses of connection moreover for the direct current collection flow box is interior to need to set up the numerous fuse of quantity, not only occupies a large amount of spaces in the direct current collection flow box, leads to direct current collection flow box bulky, with high costs, and the fuse still can produce a large amount of heats in the course of the work moreover, and then influences the life of other devices in the direct current collection flow box.
SUMMERY OF THE UTILITY MODEL
The utility model provides a direct current collection flow box and photovoltaic system uses breaking device to replace the fuse, effectively reduces direct current collection flow box's volume and cost, reduces the direct current collection flow box inside ambient temperature, helps improving direct current collection flow box's life.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the utility model provides a direct current collection flow box, include: a breaking apparatus, wherein,
the breaking device comprises a multi-component breaking circuit;
the input end of any group of the breaking circuits is connected with at least one photovoltaic module;
the output end of each breaking circuit is connected with a current converting circuit respectively;
and each group of breaking circuits is in a disconnected state under the condition of receiving a preset protection signal.
Optionally, the utility model discloses the direct current collection flow box that the first aspect provided still includes: a monitoring module, wherein,
the monitoring module is respectively connected with the converter circuit and the breaking device;
the monitoring module is used for outputting the preset protection signal;
the preset protection signal is a signal which is output by the monitoring module under the condition that the target electrical parameters of the converter circuit and the breaking circuits meet preset breaking conditions.
Optionally, the breaking circuit includes a positive pole breaking circuit and a negative pole breaking circuit, wherein,
the positive electrode input end of the positive electrode breaking circuit is connected with the positive electrode of the photovoltaic module, and the positive electrode output end of the positive electrode breaking circuit is connected with the positive electrode of the converter circuit;
the negative electrode input end of the negative electrode breaking circuit is connected with the negative electrode of the photovoltaic component, and the negative electrode output end of the negative electrode breaking circuit is connected with the negative electrode of the converter circuit;
the photovoltaic modules connected with the anode breaking circuit and the cathode breaking circuit are the same.
Optionally, at least one of the anode breaking circuit and the cathode breaking circuit is provided with an anti-reverse diode.
Optionally, the monitoring module includes a voltage collecting module, a current collecting module and a controller, wherein,
the input end of the voltage acquisition module is connected with the input end of the commutation circuit and is used for acquiring the input voltage of the commutation circuit;
the input end of the current acquisition module is respectively connected with each photovoltaic module and is used for acquiring the current of each photovoltaic module;
the output ends of the voltage acquisition module and the current acquisition module are respectively connected with the controller;
the controller is connected with the breaking device and used for outputting the preset protection signal.
Optionally, the input end of the current collection module is connected to the positive electrode of each photovoltaic module.
Optionally, the input end of the current collection module is connected to the negative electrode of each photovoltaic module.
Optionally, the monitoring module further comprises a communication module, wherein,
the communication module is connected with the controller;
the communication module is used for transmitting preset control information.
Optionally, the current collecting module comprises a plurality of current sensors, wherein,
each current sensor is respectively connected with each photovoltaic module, and the photovoltaic modules connected with the current sensors are different from each other.
Optionally, the breaking apparatus further comprises a driving mechanism, wherein,
the driving mechanisms are respectively connected with the breaking circuits;
and the driving mechanism drives each breaking circuit to be disconnected under the condition of receiving the preset protection signal.
Optionally, the dc junction box provided by the first aspect of the present invention further includes a junction bus, wherein,
and the output end of each breaking circuit is connected with the converter circuit through the bus bar.
Optionally, the preset protection signal is sent by a higher-level controller outside the dc combiner box.
In a second aspect, the present invention provides a photovoltaic system, including: a plurality of photovoltaic modules, a converter circuit and a dc combiner box according to any one of the first aspect of the present invention,
each photovoltaic module is connected with the direct current combiner box respectively;
and the direct current combiner box is connected with a public power grid through the converter circuit.
The utility model provides a direct current collection flow box, including the disjunction device who is provided with multicomponent broken circuit, at least one photovoltaic module is connected to arbitrary component broken circuit's input, and each disjunction circuit's output links to each other with the commutation circuit respectively, can realize being connected between photovoltaic module and the commutation circuit through disjunction device promptly, and is further, each component broken circuit is receiving under the condition of predetermineeing protection signal, is in the off-state, consequently, can realize the protect function who is realized by the fuse among the prior art through disjunction device. The utility model provides a direct current collection flow box under the prerequisite that realizes the original protect function of fuse, uses the breaker to replace the fuse that uses among the prior art, effectively reduces the volume of direct current collection flow box, and then reduces the hardware cost of direct current collection flow box, simultaneously, can also reduce direct current collection flow box inside ambient temperature, helps improving the life of direct current collection flow box.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc combiner box according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, the direct current collection flow box needs to set up two fuses for each photovoltaic module that links to each other rather than, and among the practical application, a plurality of photovoltaic module often need be connected to the direct current collection flow box, this makes the fuse in the direct current collection flow box numerous, can occupy the space in the direct current collection flow box in a large number, lead to the increase of direct current collection flow box volume, and is further, the fuse belongs to resistive element, can consume certain electric energy in the operation process, the while produces the heat, the fuse that sets up in the direct current collection flow box is more, the electric energy of consumption is also very considerable, more importantly, the heat that produces in the fuse working process can make direct current collection flow box inside problem rise, and then influence the normal operating of other modules, equipment inside the direct current collection flow box.
For the above-mentioned problem that the direct current conflux case exists among the solution prior art, the embodiment of the utility model provides a direct current conflux case, see fig. 1, fig. 1 the utility model provides a structural schematic diagram of direct current conflux case, the direct current conflux case that this embodiment provided, including breaking device QF.
Specifically, a multi-component breaking circuit is arranged in the breaking device QF described in this embodiment, as shown in fig. 1, the breaking circuit includes a positive pole breaking circuit and a negative pole breaking circuit, a1+, a2+ … An + represent the positive pole breaking circuit, correspondingly, a1-, a2- … An-represent the negative pole breaking circuit, a1+ and a 1-serve as one set of breaking circuits, a2+ and a 2-serve as another set of breaking circuits, and so on, An + and An-serve as one set of breaking circuits, and in the dc combiner box provided in this embodiment, n sets of breaking circuits are arranged in the breaking device QF.
In practical application, a positive electrode input end of a positive electrode breaking circuit in the breaking device is connected with a positive electrode of a photovoltaic module (shown as PV in the figure), and correspondingly, a positive electrode output end of the positive electrode breaking circuit is connected with a positive electrode (shown as DC + in the figure) of a converter circuit (not shown in the figure). The negative electrode input end of the negative electrode breaking circuit is connected with the negative electrode of the photovoltaic component, and the negative electrode output end of the negative electrode breaking circuit is connected with the negative electrode (shown as DC-in the figure) of the converter circuit.
Furthermore, the input end of any one group of breaking circuits is connected with at least one photovoltaic module. In particular, in the alternative shown in fig. 1, any one group of breaking circuits is connected to one photovoltaic module, for example, the first group of breaking circuits is connected to the photovoltaic module 1, i.e. a1+ is connected to PV1+, a 1-is connected to PV1-, the second group of breaking circuits is connected to the photovoltaic module 2, i.e. a2+ is connected to PV2+, a 2-is connected to PV2-, and so on, and is not listed.
On the basis of the embodiment shown in fig. 1, the dc combiner box provided in the embodiment shown in fig. 2 shows a case where a plurality of photovoltaic modules are connected to the same set of breaking circuit, and still taking the first set of breaking circuit as an example, the positive input terminal a1+ of the positive breaking circuit in the breaking circuit is respectively connected to the positive electrodes PV1+, PV2+ of two photovoltaic modules, and correspondingly, the negative input terminal a 1-of the negative breaking circuit in the breaking circuit is respectively connected to the negative electrodes PV1-, PV 2-of two photovoltaic modules, so as to connect the same set of breaking circuit to two photovoltaic modules, and as with the connection manner shown in fig. 1, the output terminal of the breaking circuit is connected to the input terminal of the subsequent stage inverter circuit.
Based on the embodiments shown in fig. 1 and fig. 2, it can be seen that, for any one group of breaking circuits, the photovoltaic modules connected to the positive pole breaking circuit and the negative pole breaking circuit in the breaking circuit are the same, that is, the connection control of at least one photovoltaic module can be realized through one group of breaking circuits, and the cooperation of multiple groups of breaking circuits is not required, so that not only can the reliability of the control process be improved, but also the relatively independent control of the photovoltaic modules can be realized.
On the basis of the above connection mode, the utility model discloses each embodiment provides a direct current collection flow box, each group's broken circuit in the cutting device QF is in the off-state under the condition of receiving preset protection signal to the disconnection rather than being connected of photovoltaic module and the back stage current conversion circuit that links to each other.
Optionally, as an optional implementation, predetermine the protection signal and can be sent by other higher level controllers beyond the direct current collection flow box among the photovoltaic system, for example the current conversion controller among the current conversion circuit etc., the utility model discloses do not do the restriction to the concrete selection of higher level controller, do not surpass the utility model discloses under the prerequisite of core thought scope, all belong to equally the utility model discloses in the scope of protection.
It should be noted that, in order to improve the control efficiency of each component of the breaking circuit in the breaking device, a monitoring module may be integrated in the dc combiner box, and the monitoring module sends the protection signal.
And to predetermine the opportunity of sending of protection signal, can be that the photovoltaic module that links to each other with the direct current collection flow box breaks down, perhaps the direct current collection flow box itself breaks down, perhaps other needs stop sending under the condition of direct current collection flow box work again, specifically can set up according to the actual control demand, the utility model discloses do not specifically prescribe a limit to this.
Optionally, the specific control process of each group of breaking circuits in the breaking device may be roughly divided into two types, one of which is that each group of breaking circuits can independently receive a preset protection signal and break after receiving the preset protection signal, and for this type, a controller that requires to send the preset protection signal can distinguish each group of breaking circuits and photovoltaic modules connected to each group of breaking circuits, and send the preset protection signal to the breaking circuits in the breaking device in a targeted manner.
Secondly, the breaking device is provided with a driving mechanism which is connected with each breaking circuit, the driving mechanism further receives the preset protection signal, and the driving mechanism simultaneously drives each breaking circuit to be broken under the condition of receiving the preset protection signal.
It should be noted that, for the implementation manner of setting the driving structure, when the driving device receives the preset protection signal, or the breaking device receives the preset protection signal, it can be regarded that each group of breaking circuits simultaneously receives the preset protection signal, and then are in the breaking state at the same time.
To sum up, the utility model provides a direct current collection flow box uses the breaker to replace the fuse that uses among the prior art under the prerequisite that realizes the original protect function of fuse, effectively reduces the volume of direct current collection flow box, and then reduces the hardware cost of direct current collection flow box, simultaneously, can also reduce direct current collection flow box inside ambient temperature, helps improving the life of direct current collection flow box to can also reduce the power loss of direct current collection flow box, improve photovoltaic system's generating efficiency.
Optionally, in order to prevent the reverse polarity of the photovoltaic module or the reverse flow of the short-circuit current in practical application, a reverse diode may be further disposed in the positive pole breaking circuit and/or the negative pole breaking circuit of the breaking circuit, that is, at least one of the positive pole breaking circuit and the negative pole breaking circuit is disposed with a reverse diode.
Specifically, referring to fig. 3, fig. 3 is a schematic structural diagram of another dc combiner box according to an embodiment of the present invention, and in the dc combiner box provided in this embodiment, an anti-reverse diode D1 is disposed in an anode breaking circuit of each breaking circuit. Based on the basic principle of reverse connection prevention of diodes, under the condition that a reverse connection prevention diode is arranged in an anode breaking circuit, the anode of the reverse connection prevention diode is used as the anode input end of the anode breaking circuit and is connected with the anode of a photovoltaic module, and the cathode of the reverse connection prevention diode is connected with a breaking switch in the anode breaking circuit.
Further, fig. 4 shows a situation that an anti-reverse diode D1 is arranged in the negative pole breaking circuit of each breaking circuit, and in a situation that the negative pole breaking circuit is provided with an anti-reverse diode, the negative pole of the anti-reverse diode will be used as the negative pole input end of the negative pole breaking circuit and connected with the negative pole of the photovoltaic module, and the positive pole of the anti-reverse diode is connected with the breaking switch in the negative pole breaking circuit.
Of course, the anti-reverse diodes may be provided in the positive electrode breaking circuit and the negative electrode breaking circuit of each breaking circuit at the same time, so that the overall reliability of the dc combiner box is higher, and it is conceivable that this also increases the overall design cost of the dc combiner box.
It should be noted that, in each embodiment provided by the present invention, an anti-reverse diode may be disposed in the breaking circuit, and the anti-reverse diodes are not expanded one by one here.
Optionally, in practical applications, the output ends of the respective groups of the breaking circuits in the breaking device are respectively connected to the converter circuit, and when the number of the groups of the breaking circuits in the multiple-group breaking device is large, the multiple groups of the breaking circuits are simultaneously connected to the input end of the converter circuit, which may cause wiring difficulty, and may easily cause problems such as virtual connection and short circuit.
Specifically, the BUS bar comprises an anode BUS bar BUS + and a cathode BUS bar BUS-, the anode output end of an anode breaking circuit in each breaking circuit is respectively connected with the anode BUS bar BUS +, and is connected with an anode DC + of the converter circuit through the anode BUS bar BUS +, correspondingly, the cathode output end of a cathode breaking circuit in each breaking circuit is respectively connected with the cathode BUS bar BUS-, and is connected with a cathode DC-of the converter circuit through the cathode BUS bar BUS-.
This embodiment can simplify the inside wiring process of direct current collection flow box through setting up the busbar that converges, is favorable to the reliable connection of each tie point moreover, and then ensures electric energy transmission's reliability and stability.
Optionally, as described above, the preset protection signal may be sent out by the dc combiner box itself, and the embodiment shown in fig. 6 is a specific implementation manner in this case. Referring to fig. 6, on the basis of any one of the above embodiments, the dc combiner box provided in this embodiment further includes a monitoring module.
As shown in the figure, the monitoring module is connected to the converter circuit and the breaking device, specifically, the monitoring module is connected to an input end of the converter circuit, or an output end of the breaking device, and collects a voltage input to the converter circuit, that is, a voltage between DC + and DC-; further, the monitoring module is connected to an input side of the breaking device, and collects currents output by the photovoltaic modules connected to the breaking device.
The monitoring module judges whether preset breaking conditions are met or not according to the collected target electrical parameters of the converter circuit and each breaking circuit in the breaking device, and outputs preset protection signals if the preset breaking conditions are met. Based on the foregoing, for the setting of the preset breaking condition, the setting may be based on the actual protection requirement, for example, a fault current threshold may be set, and when the collected current exceeds the fault current threshold, the preset protection signal is output; an undervoltage threshold value can also be set, and when the acquired voltage is lower than the undervoltage threshold value, a preset protection signal and the like are output.
It should be noted that, whether the monitoring module meets the judgment process of presetting the disjunction condition according to gathering the target electrical parameter, can realize based on prior art, the utility model discloses do not improve to this. In addition, in the embodiment shown in fig. 6, the current collection is realized based on the current sensor, and in practical application, the current collection may also be realized based on other manners, which is not described herein again.
Optionally, in combination with the dc combiner box provided in each of the above embodiments, in the process of implementing current collection based on the current sensor by the monitoring module, the current sensor may also be disposed at another position in the dc combiner box, see fig. 7 and fig. 8, where, in the embodiment shown in fig. 7, the current sensor collects the current of each positive electrode breaking circuit, which is also allowed. In the solution provided by the embodiment shown in fig. 8, the arrangement of the current sensor is specifically shown when the breaking circuit is connected to a plurality of photovoltaic modules at the same time, as shown in the figure, in this case, the current sensor should collect the output current of each photovoltaic module, each current sensor is connected to each photovoltaic module, and the photovoltaic modules connected to each current sensor are different from each other, so as to monitor each photovoltaic module.
Optionally, referring to fig. 9, fig. 9 is a schematic structural diagram of another dc combiner box provided in the embodiment of the present invention, and on the basis of the embodiment shown in fig. 8, this embodiment provides an optional configuration of the monitoring module, which mainly includes: a voltage acquisition module, a current acquisition module and a controller, wherein,
the input end of the voltage acquisition module is connected with the input end of the commutation circuit and is used for acquiring the input voltage of the commutation circuit; the input end of the current collection module is respectively connected with each photovoltaic module for collecting the current of each photovoltaic module, as shown in the figure, each current sensor is used as the input end of the current collection module, and for the setting position of the current sensor, the current collection module can be realized by referring to the foregoing embodiment, which is not repeated here.
The output ends of the voltage acquisition module and the current acquisition module are respectively connected with a controller, the controller is connected with a breaking device, and the controller outputs a preset protection signal under the condition that the preset breaking condition is judged to be met according to the obtained target electrical parameters.
Further, the monitoring module may further include a communication module and a power module, wherein the communication module is connected to the controller and configured to transmit preset control information and other information required to interact with the superior device. The power module is used for supplying power to all the components in the monitoring module, so that the normal operation of the monitoring module is ensured.
Optionally, in the dc combiner box provided in any of the above embodiments, the dividing apparatus may be implemented by using a multi-pole switch, the multi-pole switch is used as an independent switch device, and a plurality of groups of electrodes for communicating a front-stage circuit and a rear-stage circuit are provided.
Optionally, the utility model also provides a photovoltaic system, include: a plurality of photovoltaic modules, a converter circuit, and a dc combiner box as provided in any of the above, wherein,
each photovoltaic module is connected with a direct current combiner box;
the direct current combiner box is connected with a public power grid through a converter circuit.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, but also include other elements not expressly listed or inherent to such article or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention is not intended 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.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (14)
1. A DC combiner box, comprising: a breaking apparatus, wherein,
the breaking device comprises a multi-component breaking circuit;
the input end of any group of the breaking circuits is connected with at least one photovoltaic module;
the output end of each breaking circuit is connected with a current converting circuit respectively;
and each group of breaking circuits is in a disconnected state under the condition of receiving a preset protection signal.
2. The dc combiner box of claim 1, further comprising: a monitoring module, wherein,
the monitoring module is respectively connected with the converter circuit and the breaking device;
the monitoring module is used for outputting the preset protection signal;
the preset protection signal is a signal which is output by the monitoring module under the condition that the target electrical parameters of the converter circuit and the breaking circuits meet preset breaking conditions.
3. The DC bus bar box of claim 2, wherein the breaking circuit comprises a positive breaking circuit and a negative breaking circuit, wherein,
the positive electrode input end of the positive electrode breaking circuit is connected with the positive electrode of the photovoltaic module, and the positive electrode output end of the positive electrode breaking circuit is connected with the positive electrode of the converter circuit;
the negative electrode input end of the negative electrode breaking circuit is connected with the negative electrode of the photovoltaic component, and the negative electrode output end of the negative electrode breaking circuit is connected with the negative electrode of the converter circuit;
the photovoltaic modules connected with the anode breaking circuit and the cathode breaking circuit are the same.
4. The direct current junction box of claim 3, wherein at least one of the positive pole breaking circuit and the negative pole breaking circuit is provided with an anti-reverse diode.
5. The DC combiner box of claim 3, wherein the monitoring module comprises a voltage acquisition module, a current acquisition module, and a controller,
the input end of the voltage acquisition module is connected with the input end of the commutation circuit and is used for acquiring the input voltage of the commutation circuit;
the input end of the current acquisition module is respectively connected with each photovoltaic module and is used for acquiring the current of each photovoltaic module;
the output ends of the voltage acquisition module and the current acquisition module are respectively connected with the controller;
the controller is connected with the breaking device and used for outputting the preset protection signal.
6. The dc combiner box of claim 5, wherein the input terminals of the current collection modules are respectively connected to the positive electrodes of the photovoltaic modules.
7. The dc combiner box of claim 5, wherein the input terminals of the current collection modules are respectively connected to the negative electrodes of the photovoltaic modules.
8. The DC combiner box of claim 5, wherein the monitoring module further comprises a communication module, wherein,
the communication module is connected with the controller;
the communication module is used for transmitting preset control information.
9. The DC combiner box of claim 5, wherein the current collection module comprises a plurality of current sensors, wherein,
each current sensor is respectively connected with each photovoltaic module, and the photovoltaic modules connected with the current sensors are different from each other.
10. The DC combiner box of claim 1, wherein the breaking device further comprises a driving mechanism, wherein,
the driving mechanisms are respectively connected with the breaking circuits;
and the driving mechanism drives each breaking circuit to be disconnected under the condition of receiving the preset protection signal.
11. The DC combiner box of any of claims 1-10, further comprising a bus bar, wherein,
and the output end of each breaking circuit is connected with the converter circuit through the bus bar.
12. The dc combiner box of any of claims 1-10, wherein the predetermined protection signal is issued by a superior controller other than the dc combiner box.
13. The dc combiner box of any of claims 1-10, wherein the breaking device comprises a multi-pole switch.
14. A photovoltaic system, comprising: a plurality of photovoltaic modules, a converter circuit, and the DC combiner box of any of claims 1-13,
each photovoltaic module is connected with the direct current combiner box respectively;
and the direct current combiner box is connected with a public power grid through the converter circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120547511 | 2021-03-16 | ||
| CN2021205475110 | 2021-03-16 |
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| Publication Number | Publication Date |
|---|---|
| CN215120723U true CN215120723U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121280394.2U Active CN215120723U (en) | 2021-03-16 | 2021-06-08 | Direct current collection flow box and photovoltaic system |
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