CN108832893A - Photovoltaic module cutoff device, shutdown control method and intelligent assembly - Google Patents
Photovoltaic module cutoff device, shutdown control method and intelligent assembly Download PDFInfo
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- CN108832893A CN108832893A CN201810637632.7A CN201810637632A CN108832893A CN 108832893 A CN108832893 A CN 108832893A CN 201810637632 A CN201810637632 A CN 201810637632A CN 108832893 A CN108832893 A CN 108832893A
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- 208000031361 Hiccup Diseases 0.000 abstract description 7
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 11
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Classifications
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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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
This application provides a kind of photovoltaic module cutoff device, shutdown control method and intelligent assemblies, when photovoltaic module output voltage is lower than voltage threshold, drive module is continued as by energy-storage module and one-way conduction circuit, and electric energy is provided, guarantee that the under-voltage rear cutoff device of photovoltaic module will not power off immediately, and is to continue with conducting a period of time；Meanwhile after the output voltage of photovoltaic module is lower, controller control control switch continues that preset duration is connected.To guarantee to detect that photovoltaic module scans always from open circuit voltage conditions to short circuit current state, that is, measure the complete IV curve of photovoltaic module；Meanwhile in application process, after photovoltaic module is under-voltage or out of power, cutoff device will not be immediately turned off, and be to continue with conducting a period of time, the phenomenon that avoiding photovoltaic module from having the hiccups repeatedly, improve the stability of photovoltaic system.
Description
Technical field
The invention belongs to field of photovoltaic power generation more particularly to a kind of photovoltaic module cutoff devices, shutdown control method and intelligence
It can component.
Background technique
Photovoltaic power generation technology is used widely as a kind of renewable energy power generation technology, and photovoltaic array exports direct current
Electricity is transmitted to power grid after inverter is transformed into alternating current.The voltage of tandem photovoltaic array is very high, in order to improve photovoltaic system peace
Require photovoltaic system that can rapidly switch off entirely.Current technology scheme be in each photovoltaic module increase Quick shut-off device or
Intelligent wiring box with turn-off function.
As shown in Figure 1, the device mainly includes power module 1, sampling module 2, controller 3, drive module 4 and controls to open
Close 5, wherein power module 1 takes electricity from photovoltaic module both ends, and sampling module 2 acquires the voltage of photovoltaic module in real time and is transmitted to
Controller 3；Control switch 5 is connected in the loop of power circuit of photovoltaic module, and controller 3 can export control control according to control logic
Make the control signal of 5 ON/OFF of switch, which is transmitted to drive module 4, by drive module 4 according to receiving
It controls signal and controls 5 ON/OFF of control switch；When photovoltaic module works normally, control control switch 5 is connected, photovoltaic group
Part normally exports electric energy；When photovoltaic module shutdown, control control switch 5 is disconnected, and photovoltaic module externally exports disconnection, output electricity
Pressure is 0, to realize the safety protection function of photovoltaic module.
On the one hand, cutoff device constitutes intelligent assembly together with assembly set, needs to carry out IV curve inspection when leaving the factory
It surveys, with parameters such as the voltages, electric current, power that determine intelligent assembly.When carrying out IV curve detection, usually by external equipment with
The output end of the intelligent assembly links together, and is continuously adjusted by load, intelligent assembly is swept always from open circuit voltage conditions
Short circuit current state is retouched, and records every electrical parameter of each scanning element.Cutoff device itself, which needs to turn off when under-voltage, to be protected
Shield, when this will lead to scanning to low pressure stage, cutoff device is shut off output, and external equipment can not detect photovoltaic module at this time
Low pressure segment data especially can't detect very important short circuit current parameter.
On the other hand, photovoltaic system is cascaded power generation by multiple photovoltaic modulies, when some photovoltaic module is blocked
When, it will cause the output power of photovoltaic module insufficient, voltage, which is pulled low, even enters bypass mode to 0V.Increase cutoff device
Afterwards, cutoff device takes electricity from photovoltaic module, once photovoltaic module is under-voltage or out of power, the control switch of cutoff device just be will disconnect.
Later, since control switch disconnects, photovoltaic module can recover immediately open-circuit voltage, and control system can re-close control and hold
It closes, is equivalent to band at this time and carries starting, in closure moment, component voltage moment, which is dragged down, leads to under-voltage shutdown again, repeatedly,
I.e. photovoltaic module is had the hiccups, this will seriously affect the stability of photovoltaic system.
By above content as it can be seen that current cutoff device is unable to satisfy intelligent assembly IV curve detection, meanwhile, system application
It is easy to cause and has the hiccups repeatedly in the process, seriously affect the stability of photovoltaic system.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of photovoltaic module cutoff device, shutdown control method and intelligence
Component is unable to satisfy IV curve detection to solve current photovoltaic module cutoff device, meanwhile, it is be easy to cause in use process anti-
The technical issues of strike-on is belched.Its technical solution is specific as follows：
In a first aspect, this application provides a kind of photovoltaic module cutoff devices, including：Power module, control module, driving
Module, control switch, energy-storage module and one-way conduction circuit；
The output end of the input terminal connection photovoltaic module of the power module, the output end of the power module is the light
The other modules lied prostrate in component cutoff device provide electric energy；
The one-way conduction circuit is connected on the prime of the energy-storage module, for when one-way conduction circuit cut-off
Prevent the energy-storage module from discharging electric energy to the photovoltaic module side；
The energy-storage module is parallel to before the drive module, described in being greater than when the voltage on the energy-storage module
When the output voltage of photovoltaic module, electric energy is provided by the module connected after the energy-storage module；
The control module, for when detect the photovoltaic module output voltage be less than voltage threshold when,
Output controls the conductivity control signal of the control switch conducting in preset duration；
The drive module, the conductivity control signal for being exported according to the control module drive the control switch to lead
It is logical.
Optionally, the anode of the energy-storage module connects the feeder ear of the drive module, and cathode connects ground terminal；
The anode of the one-way conduction circuit connects the output end of the power module, and cathode connects the energy-storage module
Anode.
Optionally, the anode of the energy-storage module connects the feeder ear of the control module and the drive module, cathode
Connect ground terminal；
The anode of the one-way conduction circuit connects the output end of the power module, and cathode connects the energy-storage module
Anode.
Optionally, the one-way conduction circuit is connected on the input terminal of the power module, and the one-way conduction circuit
Cathode connect the input terminal of the power module；
The anode of the energy-storage module is connected to the cathode of the one-way conduction circuit and the input terminal of the power module
Between, the cathode of the energy-storage module connect ground terminal.
Optionally, the controller is specifically used for：
When the output voltage of the photovoltaic module is less than the voltage threshold, start timing, and exports the control control
The conductivity control signal of switch conduction processed, when timing duration is less than the output voltage etc. of the preset duration and the photovoltaic module
When the voltage threshold, timing is reset.
Optionally, the controller is also used to：
When timing duration is equal to or more than the preset duration, and the output voltage of the photovoltaic module is still less than the electricity
When pressing threshold value, the shutdown that output controls the control switch shutdown controls signal.
Optionally, the energy-storage module includes at least one capacitor.
Optionally, the one-way conduction circuit is diode；
Alternatively,
The one-way conduction circuit includes switching tube, the first end of the switching tube be the one-way conduction circuit just
Pole, second end are the cathode of the one-way conduction circuit, and control terminal connects the output end of the control module, when control module is examined
When measuring the output voltage of the photovoltaic module and being lower than the voltage of the energy-storage module, controls the switch terminals and disconnect；
Alternatively,
The one-way conduction circuit includes relay, the first contact of the relay be the one-way conduction circuit just
Pole, the second contact are the cathode of the one-way conduction circuit, and coil connects the output end of the control module, when control module is examined
When measuring the output voltage of the photovoltaic module and being lower than the voltage of the energy-storage module, first contact and described second are controlled
Contact disconnects；
Alternatively,
The one-way conduction circuit includes photoelectrical coupler, and the input terminal of the photoelectrical coupler connects the control module
Output end, the first output end is the anode of the one-way conduction circuit, and second output terminal is the negative of the one-way conduction circuit
Pole controls described the when control module detects that the output voltage of the photovoltaic module is lower than the voltage of the energy-storage module
One output end and second output terminal disconnect.
Second aspect, this application provides a kind of photovoltaic module turn off control method, be applied to first aspect is any can
Photovoltaic module cutoff device described in the implementation of energy, the method includes：
Obtain the output voltage of the photovoltaic module；
When the output voltage is less than voltage threshold, controls the control switch and continue that preset duration is connected.
Optionally, described when the output voltage is less than voltage threshold, controlling the control switch, to continue conducting default
Duration, including：
When the output voltage of the photovoltaic module is less than the voltage threshold, starts timing and export the control control
The conductivity control signal of switch conduction；
When the output voltage that timing duration is less than the preset duration and the photovoltaic module is equal to or more than the voltage
When threshold value, timing is reset；
When timing duration is equal to or more than the preset duration, and the output voltage of the photovoltaic module is still less than the electricity
When pressing threshold value, the shutdown that output controls the control switch shutdown controls signal.
The third aspect, present invention also provides a kind of intelligent assembly, including photovoltaic module and first aspect any one
Cutoff device described in possible implementation.
Photovoltaic module cutoff device provided by the present application, including power module, control module, drive module, control switch,
Energy-storage module and one-way conduction circuit.Wherein, energy-storage module is connected to the prime of drive module, when the output voltage of photovoltaic module
When less than voltage on energy-storage module, which provides electric energy for drive module；One-way conduction circuit is connected to energy storage mould
The prime of block, when energy-storage module energy storage, the one-way conduction circuit is connected, when the output voltage of photovoltaic module is lower than energy-storage module
On voltage when the one-way conduction circuit end, to prevent energy-storage module from releasing energy to photovoltaic module side.When photovoltaic module
When output voltage is less than voltage threshold, control module control control switch continues that preset duration is connected；Photovoltaic module shutdown dress
It sets, when photovoltaic module output voltage is lower than voltage threshold, drive module is continued as by energy-storage module and one-way conduction circuit
Electric energy is provided, guarantees that the under-voltage rear cutoff device of photovoltaic module will not power off immediately, and is to continue with conducting preset duration.To guarantee
It is able to detect that photovoltaic module scans always from open circuit voltage conditions to short circuit current state, that is, measures the complete IV of photovoltaic module
Curve；Meanwhile in application process, after photovoltaic module is under-voltage or out of power, cutoff device will not be immediately turned off, and be to continue with conducting
For a period of time, the phenomenon that avoiding photovoltaic module from having the hiccups repeatedly improves the stability of photovoltaic system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of schematic illustration of the cutoff device of existing photovoltaic module；
Fig. 2 a is a kind of schematic illustration of photovoltaic module cutoff device of the embodiment of the present application；
Fig. 2 b is the schematic illustration of the embodiment of the present application another kind photovoltaic module cutoff device；
Fig. 3 is the schematic illustration of the embodiment of the present application another kind photovoltaic module cutoff device；
Fig. 4 is a kind of flow chart of photovoltaic module shutdown control method of the embodiment of the present application；
Fig. 5, which is that the IV curved measurement of the photovoltaic module provided by the embodiments of the present application with cutoff device is main in the process, to join
Several waveform diagrams；
Fig. 6 is the waveform of the major parameter when photovoltaic module provided by the embodiments of the present application with cutoff device is blocked
Schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 2 a is referred to, a kind of schematic illustration of photovoltaic module cutoff device of the embodiment of the present application, this implementation are shown
In example, energy-storage module and one-way conduction circuit are arranged between power module and drive module.
As shown in Figure 2 a, which includes power module 110, control module 120, drive module 130, control switch
140, energy-storage module 150 and one-way conduction circuit 160；
Wherein, the output end of the input terminal connection photovoltaic module of power module 110, power module 110 is in cutoff device
Other modules (e.g., control module and drive module etc.) provide electric energy.
Energy-storage module 150 is connected between power module 110 and drive module 130；One-way conduction circuit 160 is connected on electricity
Between source module 110 and energy-storage module 150, wherein the output end of the anode connection power module 110 of one-way conduction circuit 160,
Cathode connects energy-storage module 150.
When the output voltage of photovoltaic module is higher than the voltage on energy-storage module 150, one-way conduction circuit 160 is connected, this
When, the electric energy that power module 110 exports is transmitted in energy-storage module 150 as 150 energy storage of energy-storage module.When the output of photovoltaic module
When voltage is less than the voltage on energy-storage module 150, one-way conduction circuit 160 ends, and energy-storage module 150, which releases energy, can and pass
The drive module 130 of rear class is transported to, the cut-off of one-way conduction circuit 160 can prevent the electric energy on energy-storage module 150 to be transmitted to light
Components side is lied prostrate, and then prevents the voltage on energy-storage module 150 from being dragged down rapidly, is continued whithin a period of time for drive module 130
Power supply provides required electric energy for the conducting of control switch 160.
In Fig. 2 a, energy-storage module 150 is indicated using capacitor, and one-way conduction circuit is indicated using diode.Certainly, in this Shen
In other embodiments please, energy-storage module 150 and one-way conduction circuit can also use other implementations.
The charge consumption that common control switch 140 (e.g., MOSFET etc.) needs when being held on is very low, substantially circuit
Quiescent current, therefore the load of energy-storage module 150 is very low, and therefore, the capacitor of very little can make control switch 140 for a long time
Inside it is held on.
Control module 120, for exporting control 140 ON/OFF of control switch according to the output voltage of photovoltaic module
Control signal；When the output voltage of photovoltaic module is less than voltage threshold, control module 120 controls control switch 140 and continues to lead
Logical preset duration.
Wherein, voltage threshold can be according to the parameter setting of control switch, for example, the blanking voltage of control switch.
In one embodiment of the application, control module 120 includes sampling module and controller, and sampling module is for adopting
Collect the output voltage of photovoltaic module and be supplied to controller, controller controls control switch according to the voltage that sampling module acquires
Conduction and cut-off state.
Specifically, when control module 120 detects that the output voltage of photovoltaic module is less than voltage threshold, when default
The conductivity control signal that continuing to output in length is connected control switch 140 is transmitted to drive module 130,130 basis of drive module
The conductivity control signal drive control switch 140 conducting.
As shown in Figure 2 b, in another embodiment of the application, the anode connection drive module 130 of energy-storage module 150
With the feeder ear of control module 120, cathode connects ground terminal；The anode of one-way conduction circuit 160 connects the defeated of power module 110
Outlet, cathode connect the anode of energy-storage module 160.In the present embodiment, when the output voltage of photovoltaic module is lower than energy-storage module 150
Voltage when, one-way conduction circuit 160 turn off, by energy-storage module 150 be rear class control module 120 and drive module 130 supply
Electricity, so that 130 drive control switch 140 of drive module continues that preset duration is connected.
In other alternative embodiments of the application, one-way conduction circuit can be realized in the following way：
1) diode
The just extremely anode of one-way conduction circuit of diode, the cathode of diode are the cathode of one-way conduction circuit, when
When the output voltage of photovoltaic module is lower than the voltage of energy-storage module, diode ends the power flow photovoltaic group for preventing energy-storage module
Part side；
2) switching tube
The control terminal of anode, cathode of the first end, second end of switching tube respectively as one-way conduction circuit, switching tube connects
Connect the output end of control module.Wherein, switching tube can be MOSFET, triode etc..
The anode of the S of NMOS tube extremely one-way conduction circuit, the cathode of D extremely one-way conduction circuit, the pole G and control module
Output end connection；When control module detect photovoltaic module output voltage be less than energy-storage module voltage when, control NMOS
Pipe shutdown.
Using PNP type triode, wherein the anode of the transmitting extremely one-way conduction circuit of triode, current collection are extremely unidirectionally led
The cathode of circuit passband, the output end of base stage link control module.When control module detects that the output voltage of photovoltaic module is less than
When the voltage of energy-storage module, control triode shutdown.
3) relay
Two contacts of relay, i.e. the first contact and the second contact are respectively as the positive terminal of one-way conduction circuit and negative
Extremely, the output end of coil link control module.When control module detects the output voltage of photovoltaic module lower than energy-storage module
Voltage when, control the first contact and the second contact and disconnect, prevent the power flow photovoltaic module side of energy-storage units.
4) photoelectrical coupler
Two output ends of the input terminal link control module of photoelectrical coupler, i.e. the first output end, second output terminal point
Not Wei one-way conduction circuit positive terminal and negative pole end, when control module detects the output voltage of photovoltaic module lower than energy storage mould
When the voltage of block, the device of the first output end and second output terminal connector that control photoelectrical coupler is disconnected, to prevent from storing up
The power flow photovoltaic module side of energy unit.
Photovoltaic module cutoff device provided in this embodiment passes through when photovoltaic module output voltage is lower than voltage threshold
Energy-storage module and one-way conduction circuit continue as drive module and provide electric energy, guarantee that the under-voltage rear cutoff device of photovoltaic module will not be stood
It powers off, and is to continue with conducting a period of time；Meanwhile after the output voltage of photovoltaic module is lower, controller controls control switch
Continue that preset duration is connected.To guarantee to detect that photovoltaic module is scanned always from open circuit voltage conditions to short circuit current shape
State measures the complete IV curve of photovoltaic module；Meanwhile in application process, after photovoltaic module is under-voltage or out of power, cutoff device
The phenomenon that will not immediately turning off, and being to continue with conducting a period of time, photovoltaic module is avoided to have the hiccups repeatedly, improves photovoltaic system
Stability.
Fig. 3 is referred to, the schematic illustration of the cutoff device of the embodiment of the present application another kind photovoltaic module, this reality are shown
The difference for applying example and Fig. 2 a illustrated embodiment is, the prime of power module is arranged in energy-storage module and one-way conduction circuit.
As shown in figure 3, the cutoff device includes power module 210, control module 220, drive module 230, control switch
240, energy-storage module 250 and one-way conduction circuit 260.The mould of same names in the effect and embodiment illustrated in fig. 2 of these modules
Block effect is identical, no longer repeats one by one herein.
As shown in figure 3, energy-storage module 250 is connected in parallel on the input terminal of power module 210, one-way conduction circuit 260 is connected on
The input terminal of power module 210, and the input terminal of the cathode connection power module 210 of one-way conduction circuit 260.Energy-storage module
250 anode is connected between the cathode of one-way conduction circuit 260 and the input terminal of power module 210, the cathode of energy-storage module
Connect ground terminal.
When the output voltage of photovoltaic module is higher than the voltage on energy-storage module 250, one-way conduction circuit 260 is connected, light
Component is lied prostrate as the charging of energy-storage module 250, that is, 250 energy storage of energy-storage module；When the output voltage of photovoltaic module is lower than energy-storage module
When voltage on 250, one-way conduction circuit 260 ends, and energy-storage module 250 releases energy to the power module 210 of rear class, so
Afterwards, the energy transmission on power module 210 is to drive module 230.The cut-off of one-way conduction circuit 260 can prevent energy-storage module
Electric energy on 250 is transmitted to photovoltaic module side, and then prevents the voltage on energy-storage module 250 from being dragged down rapidly, in a period of time
Interior is 230 continued power of drive module, provides electric energy for the conducting of control switch 240.
Photovoltaic module cutoff device provided in this embodiment passes through when photovoltaic module output voltage is lower than voltage threshold
Energy-storage module and one-way conduction circuit continue as the power module power supply of rear class, and then provide electric energy for drive module, guarantee light
Cutoff device will not power off immediately after volt component is under-voltage, and be to continue with conducting a period of time；Meanwhile the output voltage of photovoltaic module
After being lower, controller control control switch continues that preset duration is connected.To guarantee to detect photovoltaic module from open circuit electricity
Pressure condition scans always to short circuit current state, that is, measures the complete IV curve of photovoltaic module；Meanwhile in application process, light
After volt component is under-voltage or out of power, cutoff device will not be immediately turned off, and be to continue with conducting a period of time, avoid photovoltaic module repeatedly
The phenomenon that hiccup, occurs, and improves the stability of photovoltaic system.
On the other hand, present invention also provides a kind of intelligent assemblies, including pass described in photovoltaic module and above-described embodiment
Disconnected device.
Corresponding to above-mentioned photovoltaic module cutoff device embodiment, present invention also provides photovoltaic modulies to turn off control method
Embodiment.
Fig. 4 is referred to, a kind of flow chart of photovoltaic module shutdown control method of the embodiment of the present application is shown, this method is answered
It is turned off for above-mentioned photovoltaic module in the control module in control device, as shown in figure 4, this method may comprise steps of：
S110 obtains the output voltage of photovoltaic module.
Control module includes sampling module and controller, wherein sampling module acquires the output voltage of photovoltaic module, and mentions
Supply controller.
S120, judges whether the output voltage of photovoltaic module is less than voltage threshold；If it is less than voltage threshold, then execute
S130；If being not less than the voltage threshold, returns and execute S110.
S130, control control switch continue that preset duration is connected.
In one embodiment of the application, when the output voltage of photovoltaic module is less than voltage threshold, start timing simultaneously
The conductivity control signal of output control control switch conducting；When timing duration is less than the output voltage of preset duration and photovoltaic module
When equal to or more than voltage threshold, timing is reset.When timing duration is equal to or more than preset duration, and the output electricity of photovoltaic module
When pressure is still less than voltage threshold, the shutdown control instruction of output control control switch shutdown.
Photovoltaic module provided in this embodiment turns off control method, when photovoltaic module output voltage is lower than voltage threshold,
The power module power supply of rear class is continued as by energy-storage module and one-way conduction circuit, and then provides electric energy for drive module, is protected
Cutoff device will not power off immediately after card photovoltaic module is under-voltage, and be to continue with conducting a period of time；Meanwhile the output of photovoltaic module
After voltage is lower, control control switch continues that preset duration is connected.To guarantee to detect photovoltaic module from open-circuit voltage
State scans always to short circuit current state, that is, measures the complete IV curve of photovoltaic module；Meanwhile in application process, photovoltaic
Component is under-voltage or it is out of power after, cutoff device will not immediately turn off, and be to continue with conducting a period of time, avoid photovoltaic module from beating repeatedly
The phenomenon that belch, occurs, and improves the stability of photovoltaic system.
Two kinds of application scenarios of the photovoltaic module cutoff device will be introduced respectively below：
A kind of application scenarios：Measure IV curve
Assuming that IV detection device is scanned from the open circuit voltage conditions (40V) of photovoltaic module to short circuit current state (0V), electricity
Press threshold value Uth=8V, preset duration T_delay=10ms.
The IV curved measurement that Fig. 5 shows the photovoltaic module provided by the embodiments of the present application with cutoff device is main in the process
Want parameter waveform schematic diagram；
T0~t1 period：Photovoltaic module works normally, and output voltage is open-circuit voltage, such as 40V；
T1~t2 period：It carries out the first stage of IV measurement, the scanning voltage of stage IV detection device is gradually from opening
Road voltage status (e.g., 40V) gradually decreases, and scanning voltage is reduced to under-voltage point (e.g., 8V).
T2~t4 period：The output voltage of photovoltaic module is always less than 8V in the period.When scanning voltage is reduced to
When 8V or less, cutoff device detects that the output voltage of photovoltaic module lower than 8V, starts timing, meanwhile, controller can be at this
The conductivity control signal of output control control switch conducting in period；Due to the presence of energy-storage module and one-way conduction circuit,
The voltage of the power supply circuit of cutoff device slowly declines but without under-voltage, i.e., cutoff device can work normally；Therefore, mould is driven
It is constantly within the period that block can control control switch according to conductivity control signal.When timing duration is until reaching 10ms
When, controller controls control switch shutdown.Wherein, the t3 moment be scanning voltage be 0 at the time of.
The output voltage that the enough IV detection devices of 10ms scan through photovoltaic module reduces the parameter in this section of section 0V from 8V.It can
See, this method can measure the complete IV curve of intelligent assembly.
Another application scenarios：Photovoltaic module is blocked
Fig. 6 is referred to, the master when photovoltaic module provided by the embodiments of the present application with cutoff device is blocked is shown
Want the waveform diagram of parameter.In the present embodiment, voltage threshold Uth=8V, preset duration T_delay=20ms.
Before the t1 moment, photovoltaic module is worked normally, and output voltage is open-circuit voltage Voc；
T1~t2 period, photovoltaic module are blocked, for example, floating clouds, tree shade, sundries, dust etc., lead to the photovoltaic module
Output power is insufficient, and output voltage is pulled low to rapidly 8V；
T2~t4 period (20ms), since the t2 moment, the output voltage of photovoltaic module is lower than 8V, the timing since t2,
Meanwhile controller exports the conductivity control signal of control control switch conducting within the period；Simultaneously as energy-storage module and list
Presence to turning circuit, the voltage of the power supply circuit of cutoff device slowly decline but not under-voltage, that is, cutoff device is at this moment
It can be worked normally in section；Therefore, drive module can according to conductivity control signal control control switch within the period always
Conducting.
The theoretically timing since the t2 moment, 20ms time can may be very for blocking in short-term with timing to t4 moment
After a short while, the output voltage of photovoltaic module is gradually brought to 8V (t3 moment), at this point, timer is reset, control switch one
It is directly held on, will not shut down protection.To escape the under-voltage in short-term of moment, cutoff device is made smoothly to put into photovoltaic group
In part, hiccup number is reduced, the stability of photovoltaic system is improved.
For the various method embodiments described above, for simple description, therefore, it is stated as a series of action combinations, but
Be those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because according to the present invention, certain
A little steps can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know that, it is retouched in specification
The embodiment stated belongs to preferred embodiment, and related actions and modules are not necessarily necessary for the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Step in each embodiment method of the application can be sequentially adjusted, merged and deleted according to actual needs.
Each embodiment device of the application and module in terminal and submodule can be merged according to actual needs, be divided
With delete.
In several embodiments provided herein, it should be understood that disclosed terminal, device and method, Ke Yitong
Other modes are crossed to realize.For example, terminal embodiment described above is only schematical, for example, module or submodule
Division, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple submodule or
Module may be combined or can be integrated into another module, or some features can be ignored or not executed.Another point is shown
The mutual coupling, direct-coupling or communication connection shown or discussed can be through some interfaces, between device or module
Coupling or communication connection are connect, can be electrical property, mechanical or other forms.
Module or submodule may or may not be physically separated as illustrated by the separation member, as mould
The component of block or submodule may or may not be physical module or submodule, it can and it is in one place, or
It may be distributed on multiple network modules or submodule.Some or all of mould therein can be selected according to the actual needs
Block or submodule achieve the purpose of the solution of this embodiment.
In addition, each functional module or submodule in each embodiment of the application can integrate in a processing module
In, it is also possible to modules or submodule physically exists alone, it can also be integrated with two or more modules or submodule
In a module.Above-mentioned integrated module or submodule both can take the form of hardware realization, can also use software function
Energy module or the form of submodule are realized.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of photovoltaic module cutoff device, which is characterized in that including：Power module, control module, drive module, control are opened
Pass, energy-storage module and one-way conduction circuit；
The output end of the input terminal connection photovoltaic module of the power module, the output end of the power module is the photovoltaic group
Other modules in part cutoff device provide electric energy；
The one-way conduction circuit is connected on the prime of the energy-storage module, for preventing when the one-way conduction circuit ends
The energy-storage module discharges electric energy to the photovoltaic module side；
The energy-storage module is parallel to before the drive module, for being greater than the photovoltaic when the voltage on the energy-storage module
When the output voltage of component, electric energy is provided by the module connected after the energy-storage module；
The control module, for presetting when the output voltage for detecting the photovoltaic module is less than voltage threshold
Output controls the conductivity control signal of the control switch conducting in duration；
The drive module, the conductivity control signal for being exported according to the control module drive the control switch conducting.
2. cutoff device according to claim 1, which is characterized in that the anode of the energy-storage module connects the driving mould
The feeder ear of block, cathode connect ground terminal；
The anode of the one-way conduction circuit connects the output end of the power module, and cathode is connecting the energy-storage module just
Pole.
3. cutoff device according to claim 1, which is characterized in that the anode of the energy-storage module connects the control mould
The feeder ear of block and the drive module, cathode connect ground terminal；
The anode of the one-way conduction circuit connects the output end of the power module, and cathode is connecting the energy-storage module just
Pole.
4. cutoff device according to claim 1, which is characterized in that the one-way conduction circuit is connected on the power supply mould
The input terminal of block, and the cathode of the one-way conduction circuit connects the input terminal of the power module；
The anode of the energy-storage module is connected between the cathode of the one-way conduction circuit and the input terminal of the power module,
The cathode of the energy-storage module connects ground terminal.
5. cutoff device according to claim 1, which is characterized in that the controller is specifically used for：
When the output voltage of the photovoltaic module is less than the voltage threshold, start timing, and exports the control control and open
The conductivity control signal for closing conducting, be equal to when the output voltage that timing duration is less than the preset duration and the photovoltaic module or
When greater than the voltage threshold, timing is reset.
6. cutoff device according to claim 5, which is characterized in that the controller is also used to：
When timing duration is equal to or more than the preset duration, and the output voltage of the photovoltaic module is still less than the voltage threshold
When value, the shutdown that output controls the control switch shutdown controls signal.
7. cutoff device according to claim 1, which is characterized in that the energy-storage module includes at least one capacitor.
8. cutoff device according to claim 1-7, which is characterized in that the one-way conduction circuit is two poles
Pipe；
Alternatively,
The one-way conduction circuit includes switching tube, and the first end of the switching tube is the anode of the one-way conduction circuit, the
Two ends are the cathode of the one-way conduction circuit, and control terminal connects the output end of the control module, when control module detects
When the output voltage of the photovoltaic module is lower than the voltage of the energy-storage module, controls the switch terminals and disconnect；
Alternatively,
The one-way conduction circuit includes relay, and the first contact of the relay is the anode of the one-way conduction circuit,
Second contact is the cathode of the one-way conduction circuit, and coil connects the output end of the control module, when control module detects
When being lower than the voltage of the energy-storage module to the output voltage of the photovoltaic module, first contact and second touching are controlled
Point disconnects；
Alternatively,
The one-way conduction circuit includes photoelectrical coupler, and the input terminal of the photoelectrical coupler connects the defeated of the control module
Outlet, the first output end are the anode of the one-way conduction circuit, and second output terminal is the cathode of the one-way conduction circuit, when
When control module detects that the output voltage of the photovoltaic module is lower than the voltage of the energy-storage module, first output is controlled
End and second output terminal disconnect.
9. a kind of photovoltaic module turns off control method, which is characterized in that be applied to the described in any item photovoltaic groups of claim 1-8
Part cutoff device, the method includes：
Obtain the output voltage of the photovoltaic module；
When the output voltage is less than voltage threshold, controls the control switch and continue that preset duration is connected.
10. according to the method described in claim 9, it is characterized in that, described when the output voltage is less than voltage threshold, control
The control switch is made to continue that preset duration is connected, including：
When the output voltage of the photovoltaic module is less than the voltage threshold, starts timing and export the control control switch
The conductivity control signal of conducting；
When the output voltage that timing duration is less than the preset duration and the photovoltaic module is equal to or more than the voltage threshold
When, timing is reset；
When timing duration is equal to or more than the preset duration, and the output voltage of the photovoltaic module is still less than the voltage threshold
When value, the shutdown that output controls the control switch shutdown controls signal.
11. a kind of intelligent assembly, which is characterized in that including photovoltaic module and the described in any item shutdown dresses of claim 1-8
It sets.
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