Photovoltaic module
阅读说明：本技术 一种光伏组件 (Photovoltaic module ) 是由 邓士锋 董经兵 刘亚锋 邢国强 于 2018-08-31 设计创作，主要内容包括：本发明公开一种光伏组件,属于光伏发电技术领域。本发明提供的光伏组件,除电池总模块外,还具有转接模块和中接线盒,转接模块设置在中接线盒中,且并联在电池总模块的两端,利用转接模块可对光伏组件的输出电压进行调整,当发生异常或灾情时,能及时的调整光伏组件的输出状态,从而控制灾情及操作人员的安全。(The invention discloses a photovoltaic module, and belongs to the technical field of photovoltaic power generation. The photovoltaic module provided by the invention is provided with the switching module and the middle junction box besides the battery main module, the switching module is arranged in the middle junction box and connected in parallel with two ends of the battery main module, the output voltage of the photovoltaic module can be adjusted by utilizing the switching module, and when an abnormal situation or a disaster occurs, the output state of the photovoltaic module can be timely adjusted, so that the disaster situation and the safety of operators are controlled.)
1. A photovoltaic module, comprising:
the laminated part is internally provided with a battery main module, and the battery main module comprises a first battery pack, a middle battery pack and a last battery pack which are sequentially connected in series and are sequentially arranged;
the switching module is connected in parallel to two ends of the battery main module through an external cable and has a variable resistance value;
and the plurality of junction boxes comprise a first junction box, a middle junction box and a last junction box, the switching module is arranged in the middle junction box, and the adjacent two junction boxes are connected with each other in the laminated part.
2. The photovoltaic module according to 1, characterized in that a pair of positive and negative cables with opposite polarities is led out from the middle junction box to serve as an output end of the photovoltaic module.
3. The pv module of claim 2 wherein the plurality of junction boxes are arranged in parallel with the cell cluster module; each junction box is correspondingly connected with one battery pack in the battery master module.
4. The photovoltaic module according to claim 2 or 3, wherein diodes connected in reverse parallel with the head battery pack are arranged in the head terminal box, diodes connected in reverse parallel with the tail battery pack are arranged in the tail terminal box, and diodes connected in reverse parallel with the middle battery pack are arranged in the middle terminal box.
5. The pv module of claim 1 wherein the switching module comprises a dissipative element, a switch and a resistor, the dissipative element being connected in series with the resistor, the switch being connected in parallel across the dissipative element, the variable resistance of the switching module being achieved by opening or closing the switch.
6. The photovoltaic module of claim 5, wherein the resistance value of the resistor ranges from 100K Ω to 500K Ω.
7. The photovoltaic module of claim 5, wherein the resistive value of the dissipative element is 40 to 80 times the resistive value of the resistor.
8. The assembly according to claim 5, further comprising a control module and a monitoring module, wherein the control module is connected to the adaptor module and the monitoring module and controls the switch to open and close according to a remote signal command.
9. The photovoltaic module according to claim 4, wherein the photovoltaic module comprises a battery layer, a back sheet, and a terminal box layer, wherein the battery layer is provided with the battery assembly module, and the terminal boxes are provided with the terminal box layer; and the leads for connecting the first battery pack, the middle battery pack and the last battery pack of each diode are arranged on the battery layer.
10. The photovoltaic module of claim 2, wherein the middle junction box is larger in volume than the first and last junction boxes.
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module.
Background
After the photovoltaic module converts solar energy into electric energy, the electric energy is transmitted to a power supply station.
The photovoltaic module can be directly connected to the power supply station, i.e. the output voltage of the photovoltaic module is almost equal to the input voltage of the power supply station. In order to make the output voltage of the photovoltaic module reach hundreds or even thousands of volts, in practice, the battery plates may be connected in series to form a battery pack, as shown in fig. 1 and 2, several battery packs are connected in series and arranged in sequence, and each battery group has a corresponding junction box, and all the battery packs are connected in series by connecting the junction boxes in sequence and then connected to the power supply station.
Due to rapid growth of market demand of photovoltaic modules and rapid development of photovoltaic module technology, solar photovoltaic power stations are distributed in large quantities in the world, but with the increase of power stations, the reliability problems of some power stations are gradually exposed, sometimes, because of the reliability problems of the power stations, fire disasters are caused, and because the voltage of a module system is large and even reaches 1500V, inconvenience and great potential safety hazards are brought to disaster relief constructors.
Disclosure of Invention
In order to eliminate inconvenience and potential safety hazards brought to disaster relief constructors, the invention provides the photovoltaic module capable of being turned off intelligently.
According to the embodiment of the invention, the photovoltaic module comprises:
the laminated part is internally provided with a battery main module, and the battery main module comprises a first battery pack, a middle battery pack and a last battery pack which are sequentially connected in series and are sequentially arranged;
the switching module is connected in parallel to two ends of the battery main module through an external cable and has a variable resistance value;
and the plurality of junction boxes comprise a first junction box, a middle junction box and a last junction box, the switching module is arranged in the middle junction box, and the adjacent two junction boxes are connected with each other in the laminated part.
In one embodiment, the junction box further has a pair of opposite-polarity positive and negative cables led out to serve as the output end of the photovoltaic module.
In one embodiment, the plurality of junction boxes are arranged in parallel with the battery assembly module; each junction box is correspondingly connected with one battery pack in the battery master module.
In one embodiment, a diode connected in reverse parallel with the head battery pack is arranged in the head junction box, a diode connected in reverse parallel with the tail battery pack is arranged in the tail junction box, and a diode connected in reverse parallel with the middle battery pack is arranged in the middle junction box.
In one embodiment, the switching module includes a dissipative element, a switch and a resistor, the dissipative element is connected in series with the resistor, the switch is connected in parallel across the dissipative element, and the variable resistance value of the switching module is realized by opening or closing the switch.
In one embodiment, the resistance of the resistor ranges from 100K Ω to 500K Ω.
In one embodiment, the resistance value of the dissipative element is 40 to 80 times the resistance value of the resistor.
In one embodiment, the photovoltaic module further comprises a control module and a monitoring module, wherein the control module is connected with the switching module and the monitoring module and controls the switch to be opened or closed according to a remote signal instruction.
In one embodiment, the photovoltaic module comprises a battery layer, a back plate and a junction box layer which are sequentially stacked, the battery total module is arranged on the battery layer, and the junction boxes are arranged on the junction box layer; and the leads for connecting the first battery pack, the middle battery pack and the last battery pack of each diode are arranged on the battery layer.
In one embodiment, the volume of the middle junction box is larger than that of the first junction box and the last junction box.
Compared with the prior art, the photovoltaic module provided by the invention has the advantages that the switching modules are arranged in the middle junction box and are connected to the two ends of the battery main module in parallel, the output state of the photovoltaic module can be adjusted by using the switching modules, and when an abnormal situation or a disaster occurs, the output state of the photovoltaic module can be adjusted in time, so that the disaster and the safety of operators are controlled.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a prior art photovoltaic module;
FIG. 2 is a schematic view of a prior art array of terminal blocks viewed from the exterior of a photovoltaic module;
FIG. 3 is a schematic view of a photovoltaic module in an embodiment of the present invention;
fig. 4 is a schematic view of a set of terminal blocks disposed on a photovoltaic module in an embodiment of the invention;
FIG. 5 is a schematic view of another embodiment of the invention showing the modularity of the photovoltaic module;
FIG. 6 is a schematic diagram of a photovoltaic module when a switch of a conversion module is turned off in an embodiment of the present invention;
fig. 7 is a schematic diagram of a photovoltaic module when a switch of a conversion module is closed according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
The embodiment of the invention discloses a photovoltaic module, wherein a switching module is arranged in a middle junction box, the switching module is connected in parallel at two ends of a battery main module, the output voltage and current of the photovoltaic module can be adjusted by using the switching module, and when an abnormity or a disaster occurs, the output voltage and current of the photovoltaic module can be adjusted in time, so that the disaster and the safety of operators are controlled.
Referring to fig. 3, an embodiment of the present invention provides a photovoltaic module, which includes a laminate, a patching module, and a number of junction boxes. Wherein:
be equipped with battery total module in the lamination piece, battery total module is including the first group battery Es, well group battery Em and the end group battery En that establish ties in proper order and arrange in proper order. It is noted that the number of the first battery packs Es is not limited to one, and similarly, the number of the last battery packs En is not limited to one. If a plurality of first battery packs or last battery packs are included, the plurality of first battery packs or last battery packs may be sequentially arranged in series. Moreover, the number of the first battery Es and the number of the last battery En may be the same or different, and may be set according to specific requirements.
The switching module is connected in parallel with two ends of the battery main module and has a variable resistance value, and different resistance values of the switching module can be connected into a circuit of the photovoltaic module as required, so that the output voltage and the current of the photovoltaic module are changed. The specific parallel connection mode is as follows: the
The plurality of junction boxes comprise a first junction box Bs, a middle junction box Bm and a last junction box Bn, the switching modules are arranged in the middle junction box Bm and are respectively connected with the first junction box Bs and the last junction box Bn through external cables, and the adjacent two junction boxes are connected with each other inside the laminated part. The external cables may include two cables, one of the two cables L1 connects the first junction box Bs to the junction modules in the middle junction box Bm, and the other cable L2 connects the last junction box Bn to the junction modules in the middle junction box Bm.
In the embodiment of the present invention, the anode of the first junction box Bs is connected to the first input terminal 11 (not shown in the figure) of the middle junction box Bm, the cathode of the first battery Es is connected to one of the external cables L1, and the other end of the external cable L1 is connected to the
In the embodiment of the invention, a plurality of junction boxes are arranged in parallel with the battery packs in the battery master module, and each junction box is correspondingly connected with one battery pack in the battery master module. In order to reduce the complexity of wiring, each junction box is arranged at the relative position of the corresponding battery pack and is correspondingly connected. If the first junction box Bs is opposite to the position of the first battery set Es and is connected, the middle junction box Bm is opposite to the position of the middle battery set Em and is connected.
In the embodiment of the present invention, as shown in fig. 4, a diode connected in reverse parallel to the head battery pack is disposed in the head terminal box Bs to prevent the current in the head battery pack from being transmitted in reverse direction, and similarly, in addition to the switching module, a diode connected in reverse parallel to the head battery pack is also disposed in the middle terminal box Bm to prevent the current in the middle battery pack from being transmitted in reverse direction, and a diode connected in reverse parallel to the head battery pack is disposed in the last terminal box Bn to prevent the current in the last battery pack En from being transmitted in reverse direction.
In addition, a switch S and an energy consumption element Ec which are connected in parallel are arranged between the
In the embodiment of the present invention, the resistance of the resistor R is 100K Ω to 500K Ω, such as 100K Ω, 350K Ω or 500K Ω. The resistance value of the dissipative element is 40 to 80 times of the resistance value of the resistor R, for example, 40 times, 60 times or 80 times of the resistance value of the resistor. Therefore, after the energy consumption element Ec is connected, the resistance of the photovoltaic module is greatly improved, and the current in the photovoltaic module is greatly reduced.
In the implementation of the present invention, referring to fig. 5, the first battery pack Es includes a plurality of first battery packs, for example, a first battery pack string Es1 and a first battery pack string Es2, and the first battery pack string Es1 and the first battery pack string Es2 are connected in parallel; the middle battery pack Em comprises a plurality of first battery packs, such as a middle battery pack string Em1 and a middle battery pack string Em2, and the middle battery pack string Em1 and the middle battery pack string Em2 are connected in parallel; the end battery pack En includes a plurality of end battery packs, for example, an end battery string En1 and an end battery string En2, and the end battery string En1 and the end battery string En2 are connected in parallel. Of course, the number of the first battery strings included in the first battery pack, the number of the middle battery strings included in the middle battery pack, and the number of the last battery strings included in the last battery pack may be the same or different, and are not particularly limited herein.
In the embodiment of the invention, the photovoltaic assembly comprises a battery layer, a back plate and a junction box layer which are sequentially stacked, wherein the battery master module is arranged on the battery layer, and the junction boxes are arranged on the junction box layer; the wires connected with the battery packs by the junction boxes are arranged on the battery layer, namely the wires connected with the first battery pack by the diodes in the first junction box are arranged on the battery layer, the wires connected with the middle battery pack by the diodes in the middle junction box are arranged on the battery layer, and the wires connected with the last battery pack by the diodes in the last junction box are arranged on the battery layer.
In the embodiment of the invention, the photovoltaic module may further include a control module and a monitoring module, and the monitoring module is configured to detect the energy storage device and acquire monitoring data. The control module is used for connecting the voltage transformation module and the monitoring module to acquire monitoring data of the monitoring module and determine whether to act on a switch S in the voltage transformation module or not after analyzing the monitoring data. Of course, the control module may be a wireless connection voltage transformation module and a monitoring module. Specifically, the control module is wirelessly connected with the switch S to control the switch S to be turned on or off.
The photovoltaic module can also comprise an alarm module, and the alarm module is connected with the control module and used for sending alarm information after the control module receives the abnormal monitoring data of the monitoring module.
In the embodiment of the invention, the volume of the Bm of the middle junction box can be larger than the volume of the first junction box Bs and the volume of the last junction box Bn, so that when the switching module arranged in the middle junction box Bm needs to be directly operated, a user can conveniently and quickly identify the position of the switching module, and the switching module can be conveniently operated.
In addition, the photovoltaic module may further include a first coated tempered glass layer, a first vinyl acetate copolymer layer, and a second vinyl acetate copolymer layer. On the photovoltaic module, a first coated toughened glass layer, a first vinyl acetate copolymer layer, a battery layer, a second vinyl acetate copolymer layer, a backboard and a junction box layer are sequentially stacked. The back plate can be glass, namely the back plate can be second coated toughened glass.
In the embodiment of the invention, when a problem such as fire occurs in the photovoltaic power station, after the switch S receives a signal such as '0' representing 'open switch' sent by a transmitter, the switch S is opened, the energy consumption element Ec and the battery total module are connected with the resistor R1 in series at the moment, as shown in figure 7, the output voltage at the moment is the voltage at two ends of the resistor R, and the resistance based on the energy consumption element is 40-80 times of the resistance of the resistor R, so the output voltage can be rapidly reduced to one tenth of the voltage of the battery total module, and the safety operation of fire fighters can be effectively guaranteed. Meanwhile, the lower output voltage effectively reduces the phenomena of further spreading of fire, explosion and the like.
And after recovering to normal, after the switch S receives a signal such as "1" representing "closed switch" sent by the transmitter, the switch S is closed, at this time, the energy-consuming element Ec is short-circuited, and the actual circuit can be seen from fig. 6, at this time, the resistor R1 is connected in parallel with the battery total module, the output voltage is the voltage of the battery total module, and meanwhile, compared with the resistor of the battery total module, the resistor R is already a large resistor, the shunting effect is small, and therefore, the output current is not affected.
According to the photovoltaic assembly provided by the embodiment of the invention, the switching module is arranged in the middle junction box, the output voltage of the photovoltaic assembly is adjusted through the switch in the switching module, when a fire disaster occurs in a photovoltaic power station, the output voltage of the photovoltaic assembly can be greatly reduced through the switching module, and disaster relief construction personnel can effectively control the disaster condition conveniently on the premise of ensuring the personal safety of the disaster relief construction personnel.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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