CN106130476A - A kind of group string detection control circuit and control method - Google Patents
A kind of group string detection control circuit and control method Download PDFInfo
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- CN106130476A CN106130476A CN201610423842.7A CN201610423842A CN106130476A CN 106130476 A CN106130476 A CN 106130476A CN 201610423842 A CN201610423842 A CN 201610423842A CN 106130476 A CN106130476 A CN 106130476A
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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- 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
The invention discloses a kind of group string detection control circuit, it is applied to Intelligent photovoltaic combiner box, by being each equipped with a solid-state relay and a Hall element for each group of string cable that confluxes, and control unit is utilized to control the break-make of corresponding solid-state relay and complete each group of string according to the signal that gathers of Hall element and conflux the input of electric current in cable and excision.Correspondingly, the invention also discloses a kind of group string detection control method, can quickly detect fault, energy background monitoring, fix a breakdown in time, reduce accident rate；And the group string further disclosing a kind of improvement detects control method, can fix a breakdown in time, reduce accident rate, can failure judgement could recover again, it is to avoid cut group string by mistake.
Description
Technical field
The invention belongs to photovoltaic apparatus automation field, particularly relate to a kind of group string detection being applied to photovoltaic combiner box
Control circuit and control method.
Background technology
Along with the fast development of photovoltaic industry, the requirement to photovoltaic apparatus automaticity is more and more higher, and header box is made
Intermediate link for photovoltaic generating system is particularly important.
Current most of header box is only capable of group string electric current is monitored hot spot effect occur at solar panel
When can not excise fault group string timely and effectively, battery component use at the scene in the middle of the situation of hot spot effect occurs
Have: cloud cover, fallen leaves block, flying bird is blocked, dust blocks.Owing to being only capable of realizing the inspection of the voltage and current to photovoltaic group string
Surveying, be unable to realize Based Intelligent Control, being blocked for panel portions when there is battery component reverse irrigated current can not be certainly
Dynamic control, serious conditions will blow fuse and even burn out battery component.What this problem govern photovoltaic system automatically controls reality
Existing.
The method generally used for solving the hot spot effect of solaode at present is in battery component outfan parallel connection one
Individual bypass diode, the ability probability that is bigger and that break down that single diode true qualities are consumed is the highest, is solving hot spot
The problem bringing other while problem, is not a more satisfactory solution yet.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of group string detection control circuit
With two kinds of control methods, it is applied to Intelligent photovoltaic combiner box, it is possible to realization group string automatic switching, timely and effectively excision fault group
String, thus protect solar panel and reduce accident rate.
Technical scheme: to achieve these goals, the group string detection control circuit of the present invention, it is applied to photovoltaic combiner box
In, including: control unit, solid-state relay and Hall element, on the bronze medal that confluxes of described photovoltaic combiner box, connection has multiple
Group string confluxes cable, and these group strings cable that confluxes is connected with described control unit respectively, and each group of string cable that confluxes is each equipped with
One solid-state relay and a Hall element, described solid-state relay is serially connected in group string and confluxes in cable, and the group string cable that confluxes is horizontal
Wear described Hall element.
Wherein, described Hall element confluxes the current signal of cable for gathering its corresponding group string, and will collect
Current signal sends described control unit to, and the break-make that described control unit controls corresponding solid-state relay according to current signal is come
Complete each group of string to conflux the input of electric current in cable and excision.
Correspondingly, the present invention utilizes above-mentioned group of string detection control circuit carry out the method that group string detection controls, including with
Lower step:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes what cable was configured
Hall element transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then control unit control solid-state relay is cut
This group string disconnected confluxes the current path of cable, and sends alarm signal.
Further, above-mentioned control method is improved by the present invention, and the control method after improvement comprises the following steps:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes what cable was configured
Hall element transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then control unit control solid-state relay is cut
This group string disconnected confluxes the current path of cable；
After this group string confluxes the time period that cable cutting duration reaches default, then control unit controls solid-state relay
Connect this group string to conflux the current path of cable；
Confluxing cable for each group of string, its breaks accumulative, if certain group string confluxes, cable is continuous three times follow
In ring detection, its electric current is negative value or more than 10A, then control unit controls solid-state relay and cuts off this group string and conflux cable
Current path, and send alarm signal；Otherwise, its current path keeps on-state, by breaks zero setting, again
Accumulative.
Beneficial effect: the group string detection control circuit in the present invention and group string detection control method, is applied to Intelligent photovoltaic
Header box, by being each equipped with a solid-state relay and a Hall element for each group of string cable that confluxes, and utilizes control single
Unit controls the break-make of corresponding solid-state relay and completes each group of string according to the signal that gathers of Hall element and conflux electric current in cable
Input and excision, can quickly detect fault；Energy background monitoring, fixes a breakdown in time, reduces accident rate；Solid-state relay
Device reliable operation, the life-span is long, noiseless, and switching speed is fast, compatible good；The control method that present invention further propose that can be fast
Speed can also judge to recover on the basis of detecting fault, it is to avoid cut group string by mistake.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of group string detection control circuit in the present invention；
Fig. 2 is the sample circuit figure of Hall element；
Fig. 3 is the flow chart of group string detection control method in the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1:
Group string detection control circuit in Fig. 1, is applied in Intelligent photovoltaic combiner box, including: control unit, solid-state relay
Device and Hall element, the bronze medal that confluxes of Intelligent photovoltaic combiner box connects and has multiple groups of strings to conflux cable, and these group strings conflux
Cable is connected with control unit respectively, and each group of string cable that confluxes is each equipped with a solid-state relay and a Hall element, Gu
State relay is serially connected in group string and confluxes in cable, and the group string cable that confluxes crosses Hall element；Hall element is used for gathering it
Corresponding group string confluxes the current signal of cable, and sends collections signal to control unit, and control unit is according to collection signal control
Make the break-make of corresponding solid-state relay and conflux the input of electric current in cable and excision completing each group of string.
The sampling of group string electric current is completed by Hall current sensor, and Hall element is former based on magnetic balance type Hall
Reason, i.e. closed loop principle.Its principle is as in figure 2 it is shown, be through Hall element by the flux concentrating around carrying object, and Hall is first simultaneously
Part current terminal by the DC current of regulation, then will produce Hall voltage on Hall element voltage end, after being amplified by this electromotive force
The bucking coil of defeated people's magnetic core, when the magnetic flux that bucking coil produces is fully compensated the magnetic flux that tested electric current produces, bucking coil
Electric current reflect the numerical value of tested electric current in proportion, tested electric current I is that single line passes Hall element, and bucking coil is set to N circle,
Compensation electric current is I0, then have I=I when balance of flux0× N, I0U is obtained after being converted into voltage by sampling resistor R0, then have U0
=I0× R=I × R/N.Therefore, as long as recording U0Tested electric current I can be recorded0。
It is crucial, owing to solar battery group string has higher output voltage that control group gangs up the selection of disconnected relay
(DC1000V), and electric current is the biggest, so relay needs higher safe pressure voltage, and can bear bigger power,
Electromagnetic type relay can not meet requirement, selection solid-state relay in the present invention, not only has and can bear voltage height driving merit
The advantage that rate is big, and noncontacting switch mechanism, improve on-off times and switch response speed.
Embodiment 2:
The present embodiment introduces one group string detection control method for above-mentioned group of string detection control circuit, including following step
Rapid:
After header box is started working, each group string of control unit cycle detection confluxes the operating current of cable, respectively
The group string Hall element that cable configured that confluxes transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then control unit control solid-state relay is cut
This group string disconnected confluxes the current path of cable, and sends alarm signal；Described alarm signal includes numbering and the group string of header box
Conflux the number information of cable.
Under normal operation, the conflux electric current of cable of each group string should be less than 10A, and electric current can not be negative value, if therefore
The current signal that Hall element collects is negative value or more than 10A, then it is assumed that respective sets string confluxes the battery at cable place
Component failure, cuts off in time.
Embodiment 3:
In embodiment 2, once the conflux set of cells at cable place of group string breaks down, and just cuts off, if corresponding battery
Assembly only runs into and can recover fault in short-term, then can reduce the work efficiency of whole solaode.Therefore, the present embodiment pin
Control method in embodiment 2 has been done further improvement by above-mentioned group of string detection control circuit, after header box is started working,
As it is shown on figure 3, group string detection control method comprises the following steps:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes what cable was configured
Hall element transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then control unit control solid-state relay is cut
This group string disconnected confluxes the current path of cable；
After this group string confluxes the time period that cable cutting duration reaches default, then control unit controls solid-state relay
Connect this group string to conflux the current path of cable；
Confluxing cable for each group of string, its breaks accumulative, if certain group string confluxes, cable is continuous three times follow
In ring detection, its electric current is negative value or more than 10A, then control unit controls solid-state relay and cuts off this group string and conflux cable
Current path, and send alarm signal, described alarm signal includes that the numbering of header box and group string conflux the numbering letter of cable
Breath；Otherwise, its current path keeps on-state, by breaks zero setting, again adds up.
Above-mentioned control unit can use single-chip microcomputer, is connected with exchange by RS485 bus, and once single-chip microcomputer detects event
Barrier situation, provides control signal immediately and turns off the solid-state relay at fault group string place, then carry out delay process, and again sentence
Disconnected whether fault, if Failure elimination in 3 samplings, then judges that this fault is to recover fault in short-term, solar components work
Normally, removing fault message immediately, normal this group string that puts into runs；If fault yet suffers from, then judge that this fault is not short-term
Interior situation about can recover voluntarily, the most thoroughly excises this group string, and sends alarm signal to exchange, it is simple to artificial replacing is corresponding
Faulty components, thus reach protect solar panel and reduce accident rate purpose.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, in the technology concept of the present invention, technical scheme can be carried out multiple equivalents, this
A little equivalents belong to protection scope of the present invention.
Claims (7)
1. a group string detection control circuit, is applied in photovoltaic combiner box, it is characterised in that including: control unit, solid-state continue
Electrical equipment and Hall element, the bronze medal that confluxes of described photovoltaic combiner box connects and has multiple groups of strings to conflux cable, and these group strings converge
Stream cable is connected with described control unit respectively, and each group of string cable that confluxes is each equipped with a solid-state relay and a hall sensing
Device, described solid-state relay is serially connected in group string and confluxes in cable, and the group string cable that confluxes crosses described Hall element.
The most according to claim 1 group of string detection control circuit, it is characterised in that described Hall element is used for gathering it
Corresponding group string confluxes the current signal of cable, and the current signal collected sends to described control unit, described control list
Unit controls the break-make of corresponding solid-state relay according to current signal and completes each group of string and conflux the input of electric current in cable and excision.
The most according to claim 2 group of string detection control circuit, it is characterised in that described control unit is according to current signal
Control the break-make of solid-state relay to complete each group of string and conflux the input of electric current in cable and excision, particularly as follows:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes the Hall that cable is configured
Sensor transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then the cut-out of control unit control solid-state relay should
Group string confluxes the current path of cable；
After this group string confluxes the time period that cable cutting duration reaches default, control unit controls that solid-state relay connects should
Group string confluxes the current path of cable；
Confluxing cable for each group of string, its breaks accumulative, if certain group string confluxes, cable is continuous more than three times follow
In ring detection, its electric current is negative value or more than 10A, then control unit controls solid-state relay and cuts off this group string and conflux cable
Current path, and send alarm signal, described alarm signal includes that the numbering of header box and group string conflux the numbering letter of cable
Breath；Otherwise, its current path keeps on-state, by breaks zero setting, again adds up.
4. utilizing the group string detection control circuit described in claim 1 to carry out the method that group string detection controls, its feature exists
In, comprise the following steps:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes the Hall that cable is configured
Sensor transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then the cut-out of control unit control solid-state relay should
Group string confluxes the current path of cable, and sends alarm signal.
The method that the most according to claim 4 group of string detection controls, it is characterised in that described alarm signal includes header box
Numbering and group string conflux the number information of cable.
6. utilizing the group string detection control circuit described in claim 1 to carry out the method that group string detection controls, its feature exists
In, comprise the following steps:
Each group string of control unit cycle detection confluxes the operating current of cable, and i.e. each group string confluxes the Hall that cable is configured
Sensor transmits the electric current collected successively to control unit；
If certain group string confluxes, the electric current of cable is negative value or is more than 10A, then the cut-out of control unit control solid-state relay should
Group string confluxes the current path of cable；
After this group string confluxes the time period that cable cutting duration reaches default, control unit controls that solid-state relay connects should
Group string confluxes the current path of cable；
Confluxing cable for each group of string, its breaks accumulative, if certain group string confluxes, cable is continuous more than three times follow
In ring detection, its electric current is negative value or more than 10A, then control unit controls solid-state relay and cuts off this group string and conflux cable
Current path, and send alarm signal；Otherwise, its current path keeps on-state, by breaks zero setting, again
Accumulative.
The method that the most according to claim 6 group of string detection controls, it is characterised in that described alarm signal includes header box
Numbering and group string conflux the number information of cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610423842.7A CN106130476B (en) | 2016-06-14 | 2016-06-14 | A kind of string formation detection control circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610423842.7A CN106130476B (en) | 2016-06-14 | 2016-06-14 | A kind of string formation detection control circuit and control method |
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| Publication Number | Publication Date |
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| CN106130476A true CN106130476A (en) | 2016-11-16 |
| CN106130476B CN106130476B (en) | 2018-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610423842.7A Active CN106130476B (en) | 2016-06-14 | 2016-06-14 | A kind of string formation detection control circuit and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932641A (en) * | 2017-12-16 | 2019-06-25 | 郑州宇通客车股份有限公司 | A kind of battery system heating relay method for diagnosing faults and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013692A (en) * | 2009-09-04 | 2011-04-13 | 中海阳(北京)新能源电力工程有限公司 | Solar energy generating system and control system of header box thereof |
| CN102931684A (en) * | 2012-11-09 | 2013-02-13 | 东华大学 | Photovoltaic alternate current and direct current intelligent distribution box |
| US20150069840A1 (en) * | 2013-09-09 | 2015-03-12 | Mitsubishi Electric Research Laboratiories, Inc. | Maximum Power Point Tracking for Photovoltaic Power Generation System |
| CN205792457U (en) * | 2016-06-14 | 2016-12-07 | 江苏电科电气设备有限公司 | A kind of group string detection control circuit |
-
2016
- 2016-06-14 CN CN201610423842.7A patent/CN106130476B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013692A (en) * | 2009-09-04 | 2011-04-13 | 中海阳(北京)新能源电力工程有限公司 | Solar energy generating system and control system of header box thereof |
| CN102931684A (en) * | 2012-11-09 | 2013-02-13 | 东华大学 | Photovoltaic alternate current and direct current intelligent distribution box |
| US20150069840A1 (en) * | 2013-09-09 | 2015-03-12 | Mitsubishi Electric Research Laboratiories, Inc. | Maximum Power Point Tracking for Photovoltaic Power Generation System |
| CN205792457U (en) * | 2016-06-14 | 2016-12-07 | 江苏电科电气设备有限公司 | A kind of group string detection control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932641A (en) * | 2017-12-16 | 2019-06-25 | 郑州宇通客车股份有限公司 | A kind of battery system heating relay method for diagnosing faults and device |
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| CN106130476B (en) | 2018-04-17 |
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