CN113364414A - Photovoltaic module, photovoltaic power generation system and electronic equipment - Google Patents

Photovoltaic module, photovoltaic power generation system and electronic equipment Download PDF

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Publication number
CN113364414A
CN113364414A CN202110779279.8A CN202110779279A CN113364414A CN 113364414 A CN113364414 A CN 113364414A CN 202110779279 A CN202110779279 A CN 202110779279A CN 113364414 A CN113364414 A CN 113364414A
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China
Prior art keywords
photovoltaic
module
signal
unit
control
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CN202110779279.8A
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Chinese (zh)
Inventor
孟令孔
王浩
石孙节
刘荣
温多武
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Shanghai Sillumin Semiconductor Co ltd
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Shanghai Sillumin Semiconductor Co ltd
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Priority to CN202110779279.8A priority Critical patent/CN113364414A/en
Publication of CN113364414A publication Critical patent/CN113364414A/en
Priority to PCT/CN2022/080463 priority patent/WO2023279754A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a photovoltaic module, a photovoltaic power generation system and an electronic device, wherein the photovoltaic module comprises: the third junction box is provided with a first input bypass diode, and the second junction box is provided with a second input bypass diode; the first junction box is provided with an auxiliary power supply module, a control module, a transistor switch, an output bypass module and a signal conversion module; two input ends of the auxiliary power supply module are respectively connected with two ends of the third photovoltaic unit, an output end of the auxiliary power supply module is connected with the control module, a first pole and a second pole of the transistor switch are respectively connected with a second end of the third photovoltaic unit and a first end of a first side of the conversion module, and a second side of the signal conversion module is connected with the control module; the output bypass module is connected between the second end of the first photovoltaic unit and the second pole of the transistor switch, and the invention does not need an external junction box and realizes the turn-off of the photovoltaic module in a low-cost and low-voltage mode.

Description

Photovoltaic module, photovoltaic power generation system and electronic equipment
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module, a photovoltaic power generation system and electronic equipment.
Background
The photovoltaic power generation is a technology for directly converting light energy into electric energy by utilizing a photovoltaic effect of a semiconductor interface, mainly comprises a photovoltaic module and a controller, and solar battery units are connected in series and then are packaged and protected to form the large-area photovoltaic module. Meanwhile, the related NEC 2020690.12 standard requires that a photovoltaic system of a building has an emergency shutdown mechanism, and when the voltage between any two points in the system does not exceed 80V within 30s after the mechanism is started, the sum of Voc of two components may exceed 80V, so that a component-level shutdown scheme is required, that is, any two components are not connected in series after shutdown.
In the prior art, the component level shutdown scheme is generally implemented in two ways:
(1) by adopting the external hanging shut-off scheme, an independent box body is added to install the shut-off device, but the scheme can increase the material cost and the construction cost and has low integration level.
(2) For the dual-glass assembly adopting the three-split junction box, three shutoff devices are adopted and are respectively integrated in the three junction boxes, but the scheme is high in cost.
Disclosure of Invention
The invention provides a photovoltaic module, a photovoltaic power generation system and electronic equipment, and aims to solve the problem of high module-level turn-off cost.
According to a first aspect of the invention, a photovoltaic module is provided, which comprises a first junction box, a second junction box, a third junction box, a first photovoltaic unit, a second photovoltaic unit and a third photovoltaic unit, wherein any one photovoltaic unit comprises one photovoltaic sub-string or a plurality of photovoltaic sub-strings connected in parallel, a first end of the first photovoltaic sub-string is connected with a first end of the second photovoltaic unit, and a second end of the second photovoltaic unit is connected with a first end of the third photovoltaic unit; each photovoltaic sub-string comprises one photovoltaic cell unit or a plurality of photovoltaic cell units connected in parallel;
a first input bypass diode is arranged in the third junction box, the first input bypass diode is connected to two ends of the first photovoltaic unit in parallel, and a second end of the first photovoltaic unit is used as a first output end of the photovoltaic assembly;
a second input bypass diode is arranged in the second junction box and connected in parallel to two ends of the second photovoltaic unit;
an auxiliary power supply module, a control module, a transistor switch, an output bypass module and a signal conversion module are arranged in the first junction box;
two input ends of the auxiliary power module are respectively connected with two ends of the third photovoltaic unit, an output end of the auxiliary power module is connected with the control module, and the auxiliary power module is used for: supplying power to the control module using the received voltage of the third photovoltaic unit;
the first pole of the transistor switch is connected to the second end of the third photovoltaic unit, the second pole of the transistor switch is connected to the first end of the first side of the signal conversion module, the second end of the first side of the signal conversion module is used as the second output end of the photovoltaic module, the second side of the signal conversion module is connected to the control module, and the signal conversion module is used for: a first off-switch control signal is coupled from a power line, and a second off-switch control signal obtained after the first off-switch control signal is subjected to signal processing is fed back to the control module;
the control module is configured to drive the transistor switch to be switched on or switched off according to the received second switch-off control signal;
the first end of the output bypass module is connected with the second end of the first photovoltaic unit, and the second end of the output bypass module is connected with the second pole of the transistor switch.
Optionally, the signal conversion module includes a signal transformer and a PLC receiving unit;
a first end of a first side of the signal transformer is connected with a second pole of the transistor switch, and a second end of the first side of the signal transformer is used as a second output end of the photovoltaic module; the second side of the signal transformer is connected with the PLC receiving unit, and the signal transformer is used for: coupling the on-off device alternating current control signal out of the power line and feeding the on-off device alternating current control signal back to the PLC receiving unit;
the PLC receiving unit is connected with the second side of the signal transformer, the PLC receiving unit is connected with the control module, and the PLC receiving unit is used for: and converting the first off-switch control signal into a second off-switch control signal, and feeding back the second off-switch control signal to the control module.
Optionally, the signal conversion module further includes a PLC sending unit, the PLC sending unit is connected to the control module, the PLC sending unit is connected to the second side of the signal transformer, and the PLC sending unit is configured to: and generating a switch-off signal according to the received control signal sent by the control module, and coupling the switch-off signal to the power line through the signal transformer.
Optionally, the PLC transmitting unit includes a bridge circuit.
Optionally, the output bypass module includes an output bypass capacitor and an output bypass diode;
one end of the output bypass capacitor is connected with the second end of the first photovoltaic unit, and the other end of the output bypass capacitor is connected with the second pole of the transistor switch;
the cathode of the output bypass diode is connected with the second end of the first photovoltaic unit, and the anode of the output bypass diode is connected with the second pole of the transistor switch.
Optionally, the driving module is connected to the control module, the driving module is connected to the control electrode of the transistor switch, and the driving module is configured to receive a driving control signal generated by the control module, generate a driving signal according to the driving control signal, and drive the transistor switch to be turned on or off.
Optionally, the control module comprises a microcontroller,
the output end of the auxiliary power supply module is connected with the microcontroller, and the auxiliary power supply module is used for: supplying power to the microcontroller using the received voltage of the third photovoltaic unit;
the microcontroller is connected with the signal conversion module and is configured to drive the transistor switch to be switched on or switched off according to the received second switch-off control signal.
According to a second aspect of the present invention, there is provided a photovoltaic power generation system comprising a photovoltaic module and/or a plurality of photovoltaic modules connected in parallel, the photovoltaic module comprising a plurality of photovoltaic modules according to the first aspect of the present invention and its alternatives, the first and second outputs of the plurality of photovoltaic modules being connected in series.
Optionally, the photovoltaic module further comprises a shutdown controller and a control transformer, the shutdown controller is connected to a first side of the control transformer, a second side of the control transformer is connected to the first end of the photovoltaic module, and the shutdown controller is configured to generate a first shutdown control signal and couple the first shutdown control signal to the power line through the control transformer.
Optionally, the photovoltaic module further includes an inverter capacitor and a photovoltaic inverter, the inverter capacitor is connected in parallel between a first input end and a second input end of the photovoltaic inverter, the first input end of the photovoltaic inverter is connected to the first end of the photovoltaic module, the second input end of the photovoltaic inverter is connected to the second end of the photovoltaic module, the output end of the photovoltaic inverter is connected to the power grid, and the photovoltaic inverter is configured to: and converting the electric energy generated by the photovoltaic module into direct current and feeding the direct current back to the power grid.
According to a third aspect of the present invention, there is provided an electronic device comprising the photovoltaic module of the first aspect of the present invention and its alternatives.
According to the photovoltaic module, the photovoltaic power generation system and the electronic equipment, the breaker with the turn-off function, which is composed of the auxiliary power supply module, the control module, the transistor switch, the output bypass module and the signal conversion module, is integrated in the first junction box, and the output bypass module is matched with the third junction box to turn off the photovoltaic module; compared with the partial scheme that the three junction boxes are integrated with the shutoff devices, the photovoltaic module can be effectively shut down by only one shutoff device, and the cost is low;
meanwhile, the auxiliary power supply module realizes power supply to the control module by using the voltage provided by the third photovoltaic unit without providing the voltage for the whole photovoltaic module.
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, and 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 these drawings without creative efforts.
FIG. 1 is a first schematic structural diagram of a photovoltaic device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present invention.
Description of reference numerals:
1-a photovoltaic module; 11-a first junction box; 12-a second junction box; 13-a third junction box; 14-a first photovoltaic unit; 15-a second photovoltaic unit; 16-a third photovoltaic unit; 17-a photovoltaic cell unit;
111-an auxiliary power supply module; 112-a control module; 113-an output bypass module; 114-a signal conversion module; 1141-a PLC receiving unit; 1142-a PLC transmitting unit; 115-a drive module;
u1-microcontroller; a Q-transistor switch; a T-signal transformer;
d1 — first input bypass diode; d2 — second input bypass diode; d3-output bypass diode;
a first output terminal of the OUT + -photovoltaic module; OUT- -a second output of the photovoltaic module;
c1 — output bypass capacitance; c2-inverter capacitance;
2-a photovoltaic module; 3-controlling the transformer; 4-turning off the controller; 5-a photovoltaic inverter; 6-power grid.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Referring to fig. 1, an embodiment of the present invention provides a photovoltaic module 1, including a first junction box 11, a second junction box 12, a third junction box 13, a first photovoltaic unit (e.g., a first photovoltaic unit 14 in fig. 1), a second photovoltaic unit (e.g., a second photovoltaic unit 15 in fig. 1), and a third photovoltaic unit (e.g., a third photovoltaic unit 16 in fig. 1), where any one of the photovoltaic units includes one photovoltaic sub-string or a plurality of photovoltaic sub-strings connected in parallel, a first end of the first photovoltaic sub-string is connected to a first end of the second photovoltaic unit, and a second end of the second photovoltaic unit is connected to a first end of the third photovoltaic unit; each photovoltaic sub-string comprises one photovoltaic cell (which may be, for example, photovoltaic cell 17 in fig. 1) or a plurality of photovoltaic cells connected in parallel;
it should be noted that fig. 1 only shows a structure in which the photovoltaic unit includes one photovoltaic substring, when the photovoltaic unit includes two photovoltaic substrings, the two photovoltaic substrings are connected in series, both ends of the connected photovoltaic substrings after the series connection are both ends of the photovoltaic unit, when the photovoltaic unit includes three photovoltaic substrings, the three photovoltaic substrings are connected in series, the photovoltaic substrings at both ends are both ends of the connected remaining photovoltaic substrings, which are both ends of the photovoltaic unit, when the photovoltaic unit includes a plurality of substrings, and so on;
a first input bypass diode D1 is arranged in the third junction box 13, the first input bypass diode D1 is connected in parallel to two ends of the first photovoltaic unit, and a second end of the first photovoltaic unit is used as a first output end OUT + of the photovoltaic module 1; the first input bypass diode D1 is used for clamping the reverse voltage of the first photovoltaic unit and preventing the first photovoltaic unit from hot spots;
a second input bypass diode D2 is arranged in the second junction box 12, and the second input bypass diode D2 is connected in parallel to two ends of the second photovoltaic unit; the second input bypass diode D2 is used for clamping the reverse voltage of the second photovoltaic unit and preventing the second photovoltaic unit from hot spots;
an auxiliary power supply module 111, a control module 112, a transistor switch Q, an output bypass module 113 and a signal conversion module 114 are arranged in the first junction box 11;
two input ends of the auxiliary power module 111 are respectively connected to two ends of the third photovoltaic unit, an output end of the auxiliary power module 111 is connected to the control module 112, and the auxiliary power module 111 is configured to: supplying power to the control module using the received voltage of the third photovoltaic unit;
the first pole of the transistor switch Q is connected to the second end of the third photovoltaic unit, the second pole of the transistor switch Q is connected to the first end of the first side of the signal conversion module 114, the second end of the first side of the signal conversion module 114 is used as the second output end OUT "of the photovoltaic module 1, the second side of the signal conversion module 114 is connected to the control module 112, and the signal conversion module 114 is configured to: a first off-state control signal is coupled from the power line, and a second off-state control signal obtained by performing signal processing on the first off-state control signal is fed back to the control module 112;
the transistor switch can be a MOSFET tube, such as a PMOS tube or an NMOS tube, and can also be a triode;
in a further example, the transistor switch is an NMOS transistor, the control electrode of the transistor switch is a gate, the first electrode of the transistor switch is a source, and the second electrode of the transistor switch is a drain;
the control module 112 is configured to drive the transistor switch Q to be turned on or off according to the received second off control signal;
the control module can be directly connected with a control electrode of the transistor switch, and the sound field drives signals to drive the transistor switch to be switched on or switched off; the control module can also be connected to a control electrode of the transistor switch through another circuit with a driving function, so that the control module can generate a signal to reach the corresponding circuit, the circuit generates a driving signal according to the received signal, and the transistor switch can be switched on or switched off according to the signal received by the control terminal, so that the photovoltaic module can work normally or be switched off emergently;
a first end of the output bypass module 113 is connected to a second end of the first photovoltaic unit, and a second end of the output bypass module 113 is connected to a second pole of the transistor switch Q;
the output bypass unit 113 connects the first junction box with the third junction box, so that devices playing a role of turn-off can be integrated in the first junction box, and meanwhile, the output bypass unit 113 can prevent other devices in the first junction box from being damaged to influence the normal operation of the power generation system;
the first output end of the photovoltaic module can be a positive output end, the second output end of the photovoltaic module can be a negative output end, and further, when the photovoltaic module is connected with other devices, the first output end of the photovoltaic module can be connected with the second output ends of other photovoltaic modules or the inverter through a male connector, and the second output end of the photovoltaic module can be connected with the first output ends of other photovoltaic modules or the inverter through a female connector;
the connections mentioned hereinbefore and hereinafter may be understood as being connected by power lines;
in the first photovoltaic unit, the second photovoltaic unit and the third photovoltaic unit, the number of the photovoltaic substrings connected in series can be the same, and further, the voltage received by the auxiliary power supply module is one third of the voltage generated by the whole photovoltaic module; or different, and further, the voltage received by the auxiliary power supply module is less than the voltage generated by the whole photovoltaic module; no matter whether the number of the photovoltaic substrings of the photovoltaic units is the same or not, the voltage obtained by the auxiliary power supply module is smaller than the voltage generated by the photovoltaic module, namely, the control module can be powered under the condition of low voltage, so that the turn-off function is realized, and therefore, on the basis of ensuring the effectiveness of a turn-off mechanism, the cost is reduced, and the reliability is high;
meanwhile, a shutdown device with a shutdown function, which is composed of the auxiliary power supply module 111, the control module 112, the transistor switch Q, the output bypass module 113 and the signal conversion module 114, is integrated in the first junction box 11, and the output bypass module 113 is matched with the third junction box 13 to realize the shutdown of the photovoltaic assembly 1, compared with an externally-hung shutdown device adopted in a part of schemes, the invention integrates the shutdown device in the existing junction box of the photovoltaic assembly, so that the cost is low, and shielding is not formed; compared with the partial scheme that the three junction boxes are integrated with the turn-off device, the photovoltaic module can be effectively turned off by only adopting one turn-off device, and the cost is low.
In an example, when the first photovoltaic unit and/or the second photovoltaic unit includes a plurality of photovoltaic substrings, two ends of each photovoltaic substring may be connected in parallel with a bypass diode, so that both the substring-level limitation of hot spots and the unit-level limitation of hot spots may be achieved.
Referring to fig. 2, in one embodiment, the signal conversion module 114 includes a receiving unit 1141 of a signal transformer T, PLC;
a first end of a first side of the signal transformer T is connected with a second pole of the transistor switch Q, and a second end of the first side of the signal transformer T is used as a second output end OUT-of the photovoltaic component 1; the second side of the signal transformer T is connected to the PLC receiving unit 1141, and the signal transformer T is configured to: coupling the on/off switch ac control signal out of the power line and feeding it back to the PLC receiving unit 1141;
specifically, the second side of the signal transformer T may sense a signal of a specific frequency at the first side thereof, generate a sensing signal, and feed back the sensing signal to the PLC receiving unit 1141;
the PLC receiving unit 1141 is connected to the second side of the signal transformer T, the PLC receiving unit 1141 is connected to the control module 112, and the PLC receiving unit 1141 is configured to: converting the first off-switch control signal into the second off-switch control signal, and feeding back the second off-switch control signal to the control module 112;
for further example, the PLC receiving unit may include a filtering circuit and an amplifying circuit, and implement signal processing such as filtering and amplifying the control signal of the first shutdown device; specifically, the filter circuit can realize the filter function thereof in a way of connecting capacitors in parallel, can also realize the filter function in a way of connecting inductors in series, can also realize the filter function in a way of a complex impedance network consisting of capacitors and inductors, and can also be in other circuit structures; the amplifying circuit can be an operational amplifier to amplify signals and can also be realized by other circuits; the first shutdown device control signal coupled out by the signal transformer may be subjected to filtering processing and then amplification processing, or may be subjected to amplification processing and then filtering processing, and may be specifically designed according to requirements or actual application environments.
In one embodiment, the signal conversion module 114 further includes a PLC transmitting unit 1142, the PLC transmitting unit 1142 is connected to the control module 112, the PLC transmitting unit 1142 is connected to the second side of the signal transformer T, and the PLC transmitting unit 1142 is configured to: and generates a shutdown signal according to the received control signal from the control module 112, and couples the shutdown signal to the power line through the signal transformer.
In one example, the PLC signal transmitting unit includes a bridge circuit including a bridge circuit.
In a further example, the bridge circuit generates a sine wave with a certain frequency combination according to a received control signal of the control module, feeds the sine wave back to the second side of the signal transformer, and couples the sine wave to the power line through the coupling action of the signal transformer to realize communication with the turn-off controller;
in the above embodiment, the bidirectional communication between the control module and the shutdown controller is realized by the PLC transmission circuit, and the signal transformer.
In one embodiment, the output bypass module 113 includes an output bypass capacitor C1 and an output bypass diode D3;
one end of the output bypass capacitor C1 is connected to the second end of the first photovoltaic unit, and the other end of the output bypass capacitor C1 is connected to the second pole of the transistor switch Q;
the cathode of the output bypass diode D3 is connected to the second terminal of the first photovoltaic cell, and the anode of the output bypass diode D3 is connected to the second terminal of the transistor switch Q.
In the above embodiment, the input bypass diodes connected in parallel at two ends of the third photovoltaic sub-string are removed, the output bypass diodes are connected in parallel between the second pole of the transistor switch and the second end of the first photovoltaic sub-string, and the devices in the first junction box are matched with the devices in the third junction box, so that the turn-off mechanism of the single junction box integrated turn-off device is realized, and the input voltage of the turn-off device is reduced.
Referring to fig. 3, the photovoltaic module further includes a driving module 115, the driving module 115 is connected to the control module 112, the driving module 115 is connected to the control electrode of the transistor switch Q, and the driving module 115 is configured to receive a driving control signal generated by the control module 112, and generate a driving signal according to the driving control signal to drive the transistor switch Q to be turned on or off.
For further example, the driving module 115 is connected to the auxiliary power module 111, and the auxiliary power module is configured to supply power to the driving module 115.
In an example, the driving module 115 may be a push-pull circuit, and the transistor switch is driven to be turned on or off according to a driving control signal generated by the control module; in another example, the driving module is a driving chip, and generates a driving signal through a received driving control signal to turn on or off the driving transistor switch, and thus circuits that can achieve the function of turning on or off the driving transistor are included in the scope of the present invention.
In one embodiment, the control module 112 includes a microcontroller U1,
the output end of the auxiliary power supply module 111 is connected to the microcontroller U1, and the auxiliary power supply module 111 is configured to: supplying power to the microcontroller U1 using the received voltage of the third photovoltaic unit;
the microcontroller U1 is connected to the signal conversion module 114, and the microcontroller U1 is configured to drive the transistor switch to be turned on or off according to the received second switch-off control signal.
Specifically, the microcontroller U1 receives a second off-control signal fed back by the PLC receiving unit 1141, demodulates the second off-control signal to obtain a control instruction of the off-controller included in the second off-control signal, generates a driving control signal according to the instruction, generates a driving signal after receiving the driving control signal, and drives the transistor to be turned on or off;
the microcontroller U1 can also generate a control signal according to the driving condition of the transistor switch at regular time, modulate the control signal and feed back to the PLC transmitting unit 1142, and the PLC transmitting unit generates a shutdown signal according to the received control signal, and couples the shutdown signal to the power line through the signal transformer T to communicate with the shutdown controller.
Referring to fig. 4, an embodiment of the present invention further provides a photovoltaic power generation system, which includes a photovoltaic module 2 and/or a plurality of photovoltaic modules 2 connected in parallel, where the photovoltaic module 2 includes a plurality of photovoltaic modules 1 as mentioned above, and the first output end OUT + and the second output end OUT-of the plurality of photovoltaic modules 1 are sequentially connected, i in fig. 41And inFor the current generated by the photovoltaic module, the arrow in the figure is the flow direction of the current generated by the photovoltaic module.
It can be understood from the above that a plurality of photovoltaic modules are connected in series and/or in parallel to form an array of photovoltaic modules, and the plurality of photovoltaic modules collectively supply power to an external load.
In one embodiment, the photovoltaic power generation system further includes a shutdown controller 4 and a control transformer 3, the shutdown controller 4 is connected to a first side of the control transformer 3, a second side of the control transformer 3 is connected to a first end of the photovoltaic module 2, and the shutdown controller 4 is configured to generate a first shutdown control signal and couple the first shutdown control signal to the power line through the control transformer 3.
In one embodiment, the photovoltaic power generation system further includes an inverter capacitor C2 and a photovoltaic inverter 5, the inverter capacitor C2 is connected in parallel between a first input terminal and a second input terminal of the photovoltaic inverter 5, the first input terminal of the photovoltaic inverter 5 is connected to the first terminal of the photovoltaic module 2, the second input terminal of the photovoltaic inverter 5 is connected to the second terminal of the photovoltaic module 2, the output terminal of the photovoltaic inverter 5 is connected to the power grid 6, and the photovoltaic inverter 5 is configured to: and converting the electric energy generated by the photovoltaic module 2 into direct current and feeding the direct current back to the power grid 6.
In one example, the shutdown controller 4 may be external, i.e., connected to the pv power generation system as a separate device, or integrated into the pv inverter as a part of the inverter, so as to improve the system integration.
The working principle of the photovoltaic module and the photovoltaic power generation system in one embodiment of the present invention is described in detail below with reference to fig. 3 and 4:
the default state of the transistor switch Q is an off state, when the transistor switch Q needs to be turned on, the off controller 4 sends a first off-switch control signal, the control transformer 3 couples the first off-switch control signal to the power line and transmits the first off-switch control signal to the signal transformer T, the signal transformer T decouples the first off-switch control signal coupled to the power line and feeds the first off-switch control signal back to the PLC receiving unit 1142, the PLC receiving unit 1142 performs filtering amplification and other processing on the received signal to obtain a second off-switch control signal, and feeds the second off-switch control signal back to the microcontroller U1, the microcontroller U1 demodulates the received second off-switch control signal and sends the second off-switch control signal to the instruction of the off-switch controller, and then the microcontroller U1 generates a driving control signal and feeds the driving control signal back to the driving module 115, and the driving module generates the driving signal according to the received driving control signal, the transistor switch is driven to be turned on or off, and in the process, the auxiliary power supply module 111 receives the voltage of the third photovoltaic unit to supply power to the microcontroller U1 and the driving module 115;
when the information carried in the first off-switch control signal is an on instruction, the transistor switch is turned on, and when the first off-switch control signal is required to be turned off, the off controller 4 stops sending the first off-switch control signal carrying the on instruction for a period of time, and then the transistor switch Q is turned off, specifically, the microcontroller U1 keeps timing in the working process, when the first off-switch control signal carrying the on instruction is received, the timer is cleared, and when the timer reaches a predetermined value and does not receive the first off-switch control signal carrying the on instruction yet, the microcontroller U1 drives the driving module to drive the driving module to turn off the transistor switch Q, and then the driving module 115 drives the transistor switch Q to turn off.
An embodiment of the present invention further provides an electronic device, including the photovoltaic module related to the foregoing description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A photovoltaic assembly is characterized by comprising a first junction box, a second junction box, a third junction box, a first photovoltaic unit, a second photovoltaic unit and a third photovoltaic unit, wherein any one photovoltaic unit comprises one photovoltaic sub-string or a plurality of photovoltaic sub-strings connected in parallel, the first end of the first photovoltaic sub-string is connected with the first end of the second photovoltaic unit, and the second end of the second photovoltaic unit is connected with the first end of the third photovoltaic unit; each photovoltaic sub-string comprises one photovoltaic cell unit or a plurality of photovoltaic cell units connected in parallel;
a first input bypass diode is arranged in the third junction box, the first input bypass diode is connected to two ends of the first photovoltaic unit in parallel, and a second end of the first photovoltaic unit is used as a first output end of the photovoltaic assembly;
a second input bypass diode is arranged in the second junction box and connected in parallel to two ends of the second photovoltaic unit;
an auxiliary power supply module, a control module, a transistor switch, an output bypass module and a signal conversion module are arranged in the first junction box;
two input ends of the auxiliary power module are respectively connected with two ends of the third photovoltaic unit, an output end of the auxiliary power module is connected with the control module, and the auxiliary power module is used for: supplying power to the control module using the received voltage of the third photovoltaic unit;
the first pole of the transistor switch is connected to the second end of the third photovoltaic unit, the second pole of the transistor switch is connected to the first end of the first side of the signal conversion module, the second end of the first side of the signal conversion module is used as the second output end of the photovoltaic module, the second side of the signal conversion module is connected to the control module, and the signal conversion module is used for: a first off-switch control signal is coupled from a power line, and a second off-switch control signal obtained after the first off-switch control signal is subjected to signal processing is fed back to the control module;
the control module is configured to drive the transistor switch to be switched on or switched off according to the received second switch-off control signal;
the first end of the output bypass module is connected with the second end of the first photovoltaic unit, and the second end of the output bypass module is connected with the second pole of the transistor switch.
2. The photovoltaic module of claim 1, wherein the signal conversion module comprises a signal transformer, a PLC receiving unit;
a first end of a first side of the signal transformer is connected with a second pole of the transistor switch, and a second end of the first side of the signal transformer is used as a second output end of the photovoltaic module; the second side of the signal transformer is connected with the PLC receiving unit, and the signal transformer is used for: coupling the on-off device alternating current control signal out of the power line and feeding the on-off device alternating current control signal back to the PLC receiving unit;
the PLC receiving unit is connected with the second side of the signal transformer, the PLC receiving unit is connected with the control module, and the PLC receiving unit is used for: and converting the first off-switch control signal into a second off-switch control signal, and feeding back the second off-switch control signal to the control module.
3. The photovoltaic module of claim 2, wherein the signal conversion module further comprises a PLC transmission unit, the PLC transmission unit is connected to the control module, the PLC transmission unit is connected to the second side of the signal transformer, and the PLC transmission unit is configured to: and generating a switch-off signal according to the received control signal sent by the control module, and coupling the switch-off signal to the power line through the signal transformer.
4. The photovoltaic module of claim 3, wherein the PLC transmission unit comprises a bridge circuit.
5. The photovoltaic module of claim 1, wherein the output bypass module comprises an output bypass capacitor and an output bypass diode;
one end of the output bypass capacitor is connected with the second end of the first photovoltaic unit, and the other end of the output bypass capacitor is connected with the second pole of the transistor switch;
the cathode of the output bypass diode is connected with the second end of the first photovoltaic unit, and the anode of the output bypass diode is connected with the second pole of the transistor switch.
6. The photovoltaic module according to claim 1, further comprising a driving module, wherein the driving module is connected to the control module, the driving module is connected to the control electrode of the transistor switch, and the driving module is configured to receive a driving control signal generated by the control module and generate a driving signal according to the driving control signal to drive the transistor switch to turn on or turn off.
7. The photovoltaic assembly of claim 1, wherein the control module comprises a microcontroller,
the output end of the auxiliary power supply module is connected with the microcontroller, and the auxiliary power supply module is used for: supplying power to the microcontroller using the received voltage of the third photovoltaic unit;
the microcontroller is connected with the signal conversion module and is configured to drive the transistor switch to be switched on or switched off according to the received second switch-off control signal.
8. A photovoltaic power generation system comprising a photovoltaic module and/or a plurality of photovoltaic modules connected in parallel, the photovoltaic module comprising a plurality of photovoltaic modules according to any one of claims 1 to 7, the first and second outputs of the plurality of photovoltaic modules being connected in series.
9. The photovoltaic power generation system of claim 8, further comprising a shutdown controller and a control transformer, the shutdown controller being connected to a first side of the control transformer, a second side of the control transformer being connected to the first end of the photovoltaic module, the shutdown controller being configured to generate a first shutdown control signal and couple the first shutdown control signal to the power line through the control transformer.
10. The photovoltaic power generation system of claim 8, further comprising an inverter capacitor connected in parallel between a first input terminal and a second input terminal of the photovoltaic inverter, the first input terminal of the photovoltaic inverter being connected to the first terminal of the photovoltaic module, the second input terminal of the photovoltaic inverter being connected to the second terminal of the photovoltaic module, the output terminal of the photovoltaic inverter being connected to a power grid, the photovoltaic inverter being configured to: and converting the electric energy generated by the photovoltaic module into direct current and feeding the direct current back to the power grid.
11. An electronic device comprising the photovoltaic module according to any one of claims 1 to 7.
CN202110779279.8A 2021-07-09 2021-07-09 Photovoltaic module, photovoltaic power generation system and electronic equipment Pending CN113364414A (en)

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