CN108270397B - A kind of cutoff device opens control method and photovoltaic system - Google Patents
A kind of cutoff device opens control method and photovoltaic system Download PDFInfo
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- CN108270397B CN108270397B CN201810234057.6A CN201810234057A CN108270397B CN 108270397 B CN108270397 B CN 108270397B CN 201810234057 A CN201810234057 A CN 201810234057A CN 108270397 B CN108270397 B CN 108270397B
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- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 238000004891 communication Methods 0.000 claims description 74
- 230000002045 lasting effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
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- 230000001934 delay Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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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
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
What the present invention provided a kind of cutoff device opens control method, since each cutoff device is to receive provisioning instruction in batches, or bus capacitor has been completed precharge before each cutoff device receives provisioning instruction, or each cutoff device receives provisioning instruction in batches again after bus capacitor precharge, it can avoid the lasting high current that all components are started to charge to bus capacitor by zero simultaneously by cutoff device, solve the problems, such as in the prior art since service life of the lasting high current to bus capacitor has an impact.The present invention also provides a kind of photovoltaic systems, equally solve the problems, such as in the prior art by above-mentioned technical characteristic since service life of the lasting high current to bus capacitor has an impact.
Description
Technical field
The present invention relates to photovoltaic system technical field, in particular to a kind of cutoff device opens control method and photovoltaic system
System.
Background technique
Component level cutoff device is typically arranged in current photovoltaic system, after the output end series connection of each cutoff device
It is linked into the header box or inverter of rear class.It is usually that an electronic switch is connected in the loop inside cutoff device；When this
When electronic switch disconnects, the voltage or power that cutting institute's connection component externally exports guarantee that whole system is in safe voltage model
It encloses；When electronic switch closure, component is externally exported, and guarantees normal power generation.
In above system, when receiving shutdown instruction, as long as each cutoff device disconnects its internal main switch (i.e. above
In electronic switch)；When receiving provisioning instruction, each respective main switch of cutoff device quick-make, at this point, by
Bus capacitor capacity in subsequent equipment is larger, and after cutoff device closure, which is in short circuit curve, will form and continues
Short circuit current, referring to Fig. 1；Also, when the series-parallel number of group is more, the short circuit current is bigger, is continued until bus capacitor
Until voltage stabilization；And the lasting high current will have an impact the service life of bus capacitor, influence the reliable of subsequent equipment
Property.
Summary of the invention
What the present invention provided a kind of cutoff device opens control method and photovoltaic system, is set with solving rear class in the prior art
For the problem that the service life of bus capacitor is impacted.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of cutoff device opens control method, is applied to photovoltaic system, the photovoltaic system include communication host and
Multiple cutoff devices；The input terminal of the cutoff device connects at least one component；The output end string of multiple cutoff devices
Subsequent equipment is accessed after connection；The cutoff device includes: communication module, controller, drive module and main switch；The shutdown dress
The control method of opening set includes:
The communication host issues the communication module in provisioning instruction to each cutoff device；
The provisioning instruction received is forwarded to the controller by the communication module；
The controller exports open signal to the drive module according to the provisioning instruction；
The drive module controls the main switch according to the open signal and is closed；
Wherein, the communication host issues the communication module in provisioning instruction to each cutoff device, comprising:
The communication host according to predetermined number, in batches the provisioning instruction is sent to each cutoff device
Interior communication module；
Alternatively, the communication host is after the bus capacitor of the subsequent equipment completes precharge, while issuing described
Communication module in provisioning instruction to each cutoff device；
Or the communication host is after the bus capacitor of the subsequent equipment completes precharge, it is a according to presetting
Number, the communication module being sent to the provisioning instruction in each cutoff device in batches.
Preferably, the open signal includes:
The impulse wave of the default rule first exported, and, the normal open signal after the impulse wave.
Preferably, the drive module controls the main switch according to the open signal and is closed, comprising:
The drive module first controls the main switch according to the impulse wave and works in impulse modulation according to default rule
Mode；
Then the drive module is normally closed further according to the normal open signal control main switch.
Preferably, the impulse wave of the default rule are as follows: pulsewidth and the fixed impulse wave of frequency, alternatively, pulsewidth and/or
The impulse wave of changeable frequency.
Preferably, the predetermined number is 1.
A kind of photovoltaic system, comprising: communication host and multiple cutoff devices；Wherein:
The input terminal of the cutoff device connects at least one component；
Subsequent equipment is accessed after the output end series connection of multiple cutoff devices；
The cutoff device includes: communication module, controller, drive module and main switch；
The communication host for according to predetermined number, in batches provisioning instruction is sent to each cutoff device
Interior communication module；Alternatively, after the bus capacitor of the subsequent equipment completes precharge, while issuing the provisioning instruction
Communication module in each cutoff device；Or after the bus capacitor of the subsequent equipment completes precharge, according to
Predetermined number, the communication module being sent to the provisioning instruction in each cutoff device in batches；
The communication module is used to the provisioning instruction received being forwarded to the controller；
The controller is used to export open signal to the drive module according to the provisioning instruction；
The drive module is used to control the main switch according to the open signal and be closed.
Preferably, the open signal includes:
The impulse wave of the default rule first exported, and, the normal open signal after the impulse wave.
Preferably, when the drive module is used to control main switch closure according to the open signal, it is specifically used for:
The main switch is first controlled according to the impulse wave and works in pulsed mode according to default rule；Then root again
It is normally closed that the main switch is controlled according to the normal open signal.
Preferably, the impulse wave of the default rule are as follows: pulsewidth and the fixed impulse wave of frequency, alternatively, pulsewidth and/or
The impulse wave of changeable frequency.
Preferably, the cutoff device further include: power module, for the electric energy of institute's connection component to be carried out voltage conversion
It powers afterwards for the communication module and the controller.
Cutoff device provided by the invention opens control method, first pass through communication host according to predetermined number, in batches
, provisioning instruction is sent to the communication module in each cutoff device；Alternatively, the bus capacitor in subsequent equipment completes preliminary filling
After electricity, while issuing the communication module in the provisioning instruction to each cutoff device；It will be received by communication module again
Provisioning instruction be forwarded to controller；By controller according to the provisioning instruction, open signal is exported to drive module；Again by driving
Module controls main switch closure according to open signal, and that realizes component output opens function.Since each cutoff device is in batches
Provisioning instruction is received, or bus capacitor has been completed preliminary filling before each cutoff device receives provisioning instruction
Electricity, or each cutoff device receives provisioning instruction in batches again after bus capacitor precharge, can avoid whole groups
The lasting high current that part is started to charge to bus capacitor by zero simultaneously by cutoff device solves in the prior art due to continuing
The high current the problem of service life of bus capacitor is had an impact.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the voltage and current waveform diagram of the bus capacitor for the cutoff device subsequent equipment that the prior art provides；
Fig. 2 is the structural schematic diagram of photovoltaic system provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of cutoff device provided in an embodiment of the present invention；
Fig. 4 a is the flow chart for opening control method of cutoff device provided in an embodiment of the present invention；
Fig. 4 b is the partial process view for opening control method of cutoff device provided in an embodiment of the present invention；
Fig. 5 be another embodiment of the present invention provides execution cutoff device open the busbar voltage obtained after control method
Waveform diagram；
Fig. 6 is the waveform diagram of the component voltage and component electric current when the cutoff device that the prior art provides is opened；
Fig. 7 be another embodiment of the present invention provides execution cutoff device open the component voltage obtained after control method
With the waveform diagram of component electric current.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
Referring to fig. 2, photovoltaic system includes: communication host and multiple cutoff devices；
Communication host can be using modes such as 485 communications, plc communication or wireless communications；The communication host can be realized
With the communication between component level equipment (such as cutoff device), inverter or monitoring backstage.
The output end of multiple cutoff devices is connected, and connected component is made to become group string, and the both ends access after series connection
The input terminal of subsequent equipment；The subsequent equipment is conventional header box or inverter；
Cutoff device refers to that the component level product for having turn-off capacity, such as switching off device, optimizer, input terminal are connected to
A few component, it can be one-to-one connection, be also possible to a pair of of multi-connection；The cutoff device has shutdown and communication function
Energy.
Fig. 3 show the electrical diagram of cutoff device, specifically includes that communication module 101, controller 102, drive module
103 and main switch 104；In the prior art, when the provisioning instruction received is transmitted to controller 102 by communication module 101, control
Device 102 processed will control main switch 104 by drive module 103 and be closed；It is set in order to avoid biggish short circuit current will affect rear class
In the standby bus capacitor service life, what the present embodiment proposed a kind of cutoff device opens control method, as shown in fig. 4 a, comprising:
S101, communication host issue the communication module in provisioning instruction to each cutoff device；
Optionally, step S101 can be specially any one among following three mode:
A, the communication mould being sent to provisioning instruction in each cutoff device of communication host according to predetermined number, in batches
Block；
Preferably, which is 1.
B, communication host is after the bus capacitor of subsequent equipment completes precharge, while issuing provisioning instruction to each pass
Communication module in disconnected device；
C, communication host subsequent equipment bus capacitor complete precharge after, according to predetermined number, in batches will
Provisioning instruction is sent to the communication module in each cutoff device.
The provisioning instruction received is forwarded to controller by S102, communication module；
S103, controller export open signal to drive module according to provisioning instruction；
S104, drive module control main switch closure according to open signal.
In the prior art, conventional provisioning instruction is sent in the form of communication broadcast, i.e., disposably issues out in batches
Logical instruction；When all cutoff devices are closed at, the impact to rear class bus is certainly existed.Therefore, the present embodiment passes through
Employing mode A sends the mode of provisioning instruction in batches, realize step S101, can be to avoid the impact to rear class bus, specifically
:
For photovoltaic system shown in Fig. 2, wherein comprising n group string, i.e. S1, S2 ... Sn；It include multiple in each group of string
Cutoff device.Each cutoff device can receive provisioning instruction in batches, there is m cutoff device closure, 0 < m≤n every time.As most
Simply, m=1 only opens a cutoff device every time, i.e. communication host first sends the one of shutdown of provisioning instruction control
Device closure, then second cutoff device closure is controlled, and so on, until all cutoff devices are closed；It can make in this way
The waveform of busbar voltage is obtained as shown in figure 5, playing bus capacitor delays role.It avoids all components and passes through cutoff device
Lasting high current when charging simultaneously to bus capacitor, solves in the prior art since lasting high current is to bus capacitor
The problem of service life has an impact.
In view of completing all provisioning instruction occupied total times, m can take biggish value, such as every secondary control 3 passes
Disconnected device closure etc., particular number can be adjusted according to the numerical value of n in real system, be not specifically limited, existed herein
In the protection scope of the application.
Alternatively, step S101 can be pre-charged bus capacitor using pre-charging device with employing mode B, make each
Bus capacitor voltage can be raised to the degree close with group string voltage before a cutoff device closure, and then avoid all components
The lasting high current started to charge simultaneously to bus capacitor by zero by cutoff device, also can be realized the guarantor for bus capacitor
Shield.
Or step S101 first can be pre-charged bus capacitor with employing mode C, by bus capacitor electricity
Pressure is raised to suitable voltage, then each cutoff device closure of secondary control in batches, the cutoff device institute connection component being closed for the first time
Voltage it is close with bus capacitor voltage；Also it can be realized delaying for bus capacitor.
The effect of above three mode is close, wherein the cost of mode A is lower, is conducive to application；It, can be in practical application
It is selected as the case may be, within the scope of protection of this application.
It is worth noting that if being the bus of subsequent equipment when the cutoff device of a group string is closed at, in group string
The short circuit current of capacitor charging is larger, and this impact can be such that component voltage is dragged down by moment, as shown in fig. 6, component voltage is lower than
It will lead to that cutoff device is under-voltage to restart at critical under-voltage；It is closed after restarting, impacts once more again, it could be complete after being repeated several times
The work of portion's normally closed, and impact repeatedly and restart and will affect device lifetime, reduce reliability.
Therefore, control method is opened another embodiment of the present invention provides another cutoff device, in employing mode A
Basis on or employing mode B after the completion of precharge in the lower situation of bus capacitor voltage, it is preferred that step
Open signal in S103 and S203 includes:
The impulse wave of the default rule first exported, and, the normal open signal after the impulse wave.
At this point, b, step S104 include the following two step executed in sequence referring to fig. 4:
S401, drive module first control main switch according to the impulse wave and work in pulsed mode according to default rule；
S402, drive module are normally closed further according to normal open signal control main switch.
Through the above steps, it enables the controller to according to PWM (Pulse Width Modulation, pulse width tune
System) mode controls main switch；The default regular impulse wave for first issuing a period of time, enables the electric energy of institute's connection component
It is enough slowly gradually to be charged to the bus capacitor of subsequent equipment；
Referring to Fig. 7, under PWM mode control, component electric current can also be divided into multiple rising, not will cause very big impact electricity
Stream；Component voltage can be divided into multiple decline, and each fall is all smaller, not will lead to that cutoff device is under-voltage to restart.
Optionally, which can be with are as follows: pulsewidth and the fixed impulse wave of frequency, alternatively, pulsewidth and/
Or the impulse wave of changeable frequency.That is, service time Ton and turn-off time Toff and cycle times of the pwm pulse in Fig. 7
Number, can be configured according to the actual situation；And each pwm pulse pulsewidth and interval can be different, as pulsewidth by
Gradual change is big, can shorten the system stable time；It is not specifically limited, can exist depending on its specific application environment herein
In the protection scope of the application.
After continuous several cycles, the voltage of bus capacitor is gradually increasing, then normal by normal open signal control main switch
It closes, that realizes component output opens function；It can avoid disposably filling bus capacitor with biggish dash current in this way
Influence brought by electric for the cutoff device service life, improves the reliability of system, meanwhile, it also can further ensure that bus
Capacitor delays.
Another embodiment of the present invention additionally provides a kind of photovoltaic system, referring to fig. 2, comprising: communication host and multiple shutdowns
Device；Wherein:
The input terminal of cutoff device connects at least one component；
The output end of multiple cutoff devices is connected, and connected component is made to become group string, and the both ends access after series connection
Subsequent equipment；The subsequent equipment is conventional header box or inverter；
Referring to Fig. 3, which includes: communication module 101, controller 102, drive module 103 and main switch 104；
Wherein:
Communication host is for the communication being sent to provisioning instruction in each cutoff device according to predetermined number, in batches
Module 101；Alternatively, after the bus capacitor of subsequent equipment completes precharge, while issuing provisioning instruction to each shutdown and filling
Set interior communication module 101；Or after the bus capacitor of subsequent equipment completes precharge, according to predetermined number, in batches
The secondary communication module 101 being sent to provisioning instruction in each cutoff device；
Communication module 101 is used to the provisioning instruction received being forwarded to controller 102；
Controller 102 is used to export open signal to drive module 103 according to provisioning instruction；
Drive module 103 is used to control main switch 104 according to open signal and be closed.
Preferably, open signal includes:
The impulse wave of the default rule first exported, and, the normal open signal after impulse wave.
Preferably, when drive module 103 is used to control main switch closure according to open signal, it is specifically used for:
Main switch is first controlled according to impulse wave and works in pulsed mode according to default rule；Then believe further according to normal open
Number control main switch it is normally closed.
Preferably, the impulse wave of rule is preset are as follows: pulsewidth and the fixed impulse wave of frequency, alternatively, pulsewidth and/or frequency
Variable impulse wave.
Preferably, referring to Fig. 3, the cutoff device further include: power module 105, for by the electric energy of institute's connection component into
Row voltage is powered after converting into communication module 101 and controller 102.
Specific principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of cutoff device opens control method, which is characterized in that be applied to photovoltaic system, the photovoltaic system includes logical
Believe host and multiple cutoff devices；The input terminal of the cutoff device connects at least one photovoltaic module；Multiple shutdown dresses
Subsequent equipment is accessed after the output end series connection set；The cutoff device includes: that communication module, controller, drive module and master open
It closes；The control method of opening of the cutoff device includes:
The communication host issues the communication module in provisioning instruction to each cutoff device；
The provisioning instruction received is forwarded to the controller by the communication module；
The controller exports open signal to the drive module according to the provisioning instruction；
The drive module controls the main switch according to the open signal and is closed；
Wherein, the communication host issues the communication module in provisioning instruction to each cutoff device, comprising:
The communication host the provisioning instruction being sent in each cutoff device according to predetermined number, in batches
Communication module；
Alternatively, the communication host while issuing described open-minded after the bus capacitor of the subsequent equipment completes precharge
It instructs to the communication module in each cutoff device；
Or the communication host according to predetermined number, divides after the bus capacitor of the subsequent equipment completes precharge
The communication module of batch being sent to the provisioning instruction in each cutoff device.
2. cutoff device according to claim 1 opens control method, which is characterized in that the open signal includes:
The impulse wave of the default rule first exported, and, the normal open signal after the impulse wave.
3. cutoff device according to claim 2 opens control method, which is characterized in that the drive module is according to institute
It states open signal and controls the main switch closure, comprising:
The drive module first controls the main switch according to the impulse wave and works in pulsed mode according to default rule；
Then the drive module is normally closed further according to the normal open signal control main switch.
4. cutoff device according to claim 2 opens control method, which is characterized in that the pulse of the default rule
Wave are as follows: pulsewidth and the fixed impulse wave of frequency, alternatively, the impulse wave of pulsewidth and/or changeable frequency.
5. cutoff device according to claim 1 to 4 opens control method, which is characterized in that the predetermined number
It is 1.
6. a kind of photovoltaic system characterized by comprising communication host and multiple cutoff devices；Wherein:
The input terminal of the cutoff device connects at least one photovoltaic module；
Subsequent equipment is accessed after the output end series connection of multiple cutoff devices；
The cutoff device includes: communication module, controller, drive module and main switch；
Provisioning instruction for being sent in each cutoff device according to predetermined number, in batches by the communication host
Communication module；Alternatively, after the bus capacitor of the subsequent equipment completes precharge, while the provisioning instruction is issued to each
Communication module in a cutoff device；Or after the bus capacitor of the subsequent equipment completes precharge, according to default
Number, the communication module being sent to the provisioning instruction in each cutoff device in batches；
The communication module is used to the provisioning instruction received being forwarded to the controller；
The controller is used to export open signal to the drive module according to the provisioning instruction；
The drive module is used to control the main switch according to the open signal and be closed.
7. photovoltaic system according to claim 6, which is characterized in that the open signal includes:
The impulse wave of the default rule first exported, and, the normal open signal after the impulse wave.
8. photovoltaic system according to claim 7, which is characterized in that the drive module is used for according to the open signal
When controlling main switch closure, it is specifically used for:
The main switch is first controlled according to the impulse wave and works in pulsed mode according to default rule；Then further according to institute
It is normally closed to state the normal open signal control main switch.
9. photovoltaic system according to claim 7, which is characterized in that the impulse wave of the default rule are as follows: pulsewidth and frequency
The fixed impulse wave of rate, alternatively, the impulse wave of pulsewidth and/or changeable frequency.
10. according to any photovoltaic system of claim 6 to 9, which is characterized in that the cutoff device further include: power supply
Module, for power after voltage is converted into the communication module and the controller electric energy of connected photovoltaic module.
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| CN108964136B (en) * | 2018-09-17 | 2020-09-11 | 阳光电源股份有限公司 | Photovoltaic turn-off system and control method thereof |
| CN109149777B (en) | 2018-09-28 | 2020-07-07 | 阳光电源股份有限公司 | Shutdown control system and method |
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| JP2015233386A (en) * | 2014-06-10 | 2015-12-24 | 日東工業株式会社 | Photovoltaic power generation system |
| KR20160046126A (en) * | 2014-10-20 | 2016-04-28 | 주식회사 맥사이언스 | Method and Apparatus of Inspecting Solar Module |
| CN106602998A (en) * | 2017-02-28 | 2017-04-26 | 阳光电源股份有限公司 | Instruction sending device and photovoltaic component closing system |
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| US8854193B2 (en) * | 2009-12-29 | 2014-10-07 | Tigo Energy, Inc. | Systems and methods for remote or local shut-off of a photovoltaic system |
| CN106981881A (en) * | 2016-01-18 | 2017-07-25 | 台达电子企业管理（上海）有限公司 | A kind of photovoltaic generating system and its rapidly switch off method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015233386A (en) * | 2014-06-10 | 2015-12-24 | 日東工業株式会社 | Photovoltaic power generation system |
| KR20160046126A (en) * | 2014-10-20 | 2016-04-28 | 주식회사 맥사이언스 | Method and Apparatus of Inspecting Solar Module |
| CN106602998A (en) * | 2017-02-28 | 2017-04-26 | 阳光电源股份有限公司 | Instruction sending device and photovoltaic component closing system |
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