CN105978483A - Photovoltaic combiner box and method and device for installation analysis of defend and counterattack diodes of photovoltaic combiner box - Google Patents
Photovoltaic combiner box and method and device for installation analysis of defend and counterattack diodes of photovoltaic combiner box Download PDFInfo
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- CN105978483A CN105978483A CN201510849492.6A CN201510849492A CN105978483A CN 105978483 A CN105978483 A CN 105978483A CN 201510849492 A CN201510849492 A CN 201510849492A CN 105978483 A CN105978483 A CN 105978483A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
The embodiment of the invention provides a photovoltaic combiner box and a method and device for installation analysis of defend and counterattack diodes of a photovoltaic combiner box. The method comprises: the reverse current IZDW and the work voltage UZDW of a shielded photovoltaic battery pack are obtained according to a U-I characteristic curve; the work voltage UW of the shielded photovoltaic battery pack is determined according to the reverse current IZDW; it is determined whether the difference of the work voltage UW and the work voltage UZDW is smaller than a voltage error amplitude limiting or not; and if the difference of the work voltage UW and the work voltage UZDW is smaller than a voltage error amplitude limiting, the minimum number of the defend and counterattack diodes when the reverse current passes through the reverse current verification. According to the invention, the minimum number of the defend and counterattack diodes requiring to be installed can be analyzed to reduce current flowing backwards in the combiner box, reduce the power consumption caused by the conduction pressure drop of the defend and counterattack diodes and improve the operation efficiency of the photovoltaic power generation system when the local photovoltaic module is shielded.
Description
Technical field
The present invention is about photovoltaic combiner box Energy Efficiency Analysis technology, especially with regard to a kind of photovoltaic combiner box and counnter attack two thereof
Pole pipe installing analysis method, device.
Background technology
Along with economic sustainable development and the continuous aggravation of environmental pollution, the development and utilization of regenerative resource has become as
Trend of the times.According to the energy strategy policy of country, solar photovoltaic technology can efficiently solve energy shortage
And the problem reducing carbon emission.How improving photovoltaic efficiency, each assembly and link to photovoltaic generation carry out energy
Effect is analyzed the most particularly important.Header box collects, as being merged by some photovoltaic module string electric currents, the weight being input in inverter
Want a ring, need the power attenuation analyzed and study in its work process.
The invention entitled photovoltaic array conflux box for solar photovoltaic generation system (number of patent application:
Chinese patent 201020564614.X) proposes a section that the series connection of each photovoltaic group string is received fuse, fusing
The other end of device is connected to the input pole of counnter attack diode, and the output stage of counnter attack diode is connected to by current detection module
On positive and negative busbar.But, this patent is stoping between each group of string while circulation, in the course of the work at counnter attack diode
Can produce certain pressure drop (about 0.7V), corresponding creates certain power attenuation.
Summary of the invention
Embodiments provide a kind of photovoltaic combiner box and counnter attack diode installing analysis method, device, to divide
Analysis needs the minimum number of counnter attack diode to be mounted, to solve local light photovoltaic assembly is blocked when, reduces and converges
The anti-electric current that fills in stream case, reduces the power attenuation caused by counnter attack N, improves photovoltaic generation
The operational efficiency of system.
To achieve these goals, the counnter attack diode installing analysis of a kind of photovoltaic combiner box is embodiments provided
Method, this counnter attack diode installing analysis method includes:
The reverse current I of the photovoltaic cell component being blocked is obtained according to U-I characteristic curveZDWAnd running voltage UZDW；
According to described reverse current IZDWDetermine running voltage U of the photovoltaic cell component not being blockedW；
Judge described running voltage UWWith described running voltage UZDWDifference whether less than voltage error amplitude limit；
If it is, the minimum number of counnter attack diode when reversing current through reverse current verification described in determining.
In one embodiment, the reverse current I of the described photovoltaic cell component obtaining according to U-I characteristic curve being blockedZDW
And running voltage UZDW, including:
The initial reverse electric current I of the photovoltaic cell component being blocked is calculated according to U-I characteristic curveZDW0And initialization
Voltage UZDW0；
Number m, the number n of the photovoltaic cell group string that is blocked and described initial reverse electric current according to photovoltaic cell group string
IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein m=aN, N are counnter attack two pole
The number of pipe, a is positive integer；
Judge described initial operating voltage UW0With described initial operating voltage UZDW0Difference whether less than voltage error
Amplitude limit；
If it does not, by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain described reverse current IZDW
And running voltage UZDW。
In one embodiment, described according to described reverse current IZDWDetermine the work electricity of the photovoltaic cell component not being blocked
Pressure UW, including:
Running voltage U of the photovoltaic cell component not being blocked is determined according to described U-I characteristic curveW。
In one embodiment, if described running voltage UWWith described running voltage UZDWNot less than voltage error amplitude limit,
Also include:
By (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine not
Running voltage U of the photovoltaic cell component being blockedW；
Reverse current I after rejudging according to assignmentZDWRunning voltage U determinedWWith the reverse current after assignment
IZDWCorresponding running voltage UZDWDifference whether less than voltage error amplitude limit, loop iteration, until described difference
Less than described voltage error amplitude limit, obtain the reverse current I of the stable state of the photovoltaic cell component being blockedZDWAnd work electricity
Pressure UZDW。
In one embodiment, determine described in the minimum number of counnter attack diode when reversing current through reverse current verification,
Including:
The reverse current I of the stable state of the photovoltaic cell component being relatively blockedZDW=(m-n) IW=(aN-n) IWWith
Big reverse current IfSize；
Determine closest to maximum reverse current IfIZDWThe N value that value is corresponding, this N is minimum of counnter attack diode
Number.
In one embodiment, determine described in the minimum number of counnter attack diode when reversing current through reverse current verification,
Including:
Judge the reverse current I of stable state by the photovoltaic cell component being blockedZDWWith UZDWLong-pending with in peak power
The relation of limit；
Determining the N value of the long-pending correspondence closest to the peak power upper limit, this N is the minimum number of counnter attack diode.
In one embodiment, this counnter attack diode installing analysis method also includes:
If N is 1, described counnter attack diode is located at the output loop of described photovoltaic combiner box.
In one embodiment, this counnter attack diode installing analysis method also includes:
If N is more than 1, each counnter attack diode is located at described photovoltaic combiner boxIndividual photovoltaic cell group string props up
Lu Shang, makesThe individual public counnter attack diode of photovoltaic cell group string branch road.
To achieve these goals, the embodiment of the present invention provides the counnter attack diode installing analysis dress of a kind of photovoltaic combiner box
Putting, this counnter attack diode installing analysis device includes:
Reverse current signal generating unit, the reverse electricity of the photovoltaic cell component for obtaining being blocked according to U-I characteristic curve
Stream IZDWAnd running voltage UZDW；
Running voltage determines unit, for according to described reverse current IZDWDetermine the photovoltaic cell component that is not blocked
Running voltage UW；
Judging unit, it is judged that described running voltage UWWith described running voltage UZDWDifference whether less than voltage error
Amplitude limit；
Number determines unit, the minimum of counnter attack diode during for reversing current through reverse current verification described in determining
Number.
In one embodiment, described reverse current signal generating unit includes:
Initial current computing module, for calculating the initial anti-of the photovoltaic cell component that is blocked according to U-I characteristic curve
To electric current IZDW0And initial operating voltage UZDW0；
Voltage computing module, for number m, the number n of the photovoltaic cell group string that is blocked according to photovoltaic cell group string
And described initial reverse electric current IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein
M=aN, N are the number of counnter attack diode, and a is positive integer；
Amplitude limit judge module, is used for judging described initial operating voltage UW0With described initial operating voltage UZDW0Difference
Whether value is less than voltage error amplitude limit；
Reverse current computing module, for by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain institute
State reverse current IZDWAnd running voltage UZDW。
In one embodiment, described running voltage determine unit specifically for: according to described U-I characteristic curve determine not by
Running voltage U of the photovoltaic cell component blockedW。
In one embodiment, this counnter attack diode installing analysis device also includes:
Assignment unit, when described running voltage UWWith described running voltage UZDWDuring not less than voltage error amplitude limit, use
In by (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine not by
Running voltage U of the photovoltaic cell component blockedW；Described judging unit rejudge according to assignment after reverse current
IZDWRunning voltage U determinedWWith the reverse current I after assignmentZDWCorresponding running voltage UZDWDifference the least
In voltage error amplitude limit.
In one embodiment, described number determines that unit includes:
Comparison module, for comparing the reverse current of the stable state of the photovoltaic cell component being blocked
IZDW=(m-n) IW=(aN-n) IWWith maximum reverse current IfSize；
N value determines module, is used for determining closest to maximum reverse current IfIZDWThe N value that value is corresponding, this N is
The minimum number of counnter attack diode.
In one embodiment, described number determines that unit includes:
Upper limit judge module, for judging the reverse current I of the stable state by the photovoltaic cell component being blockedZDWWith UZDW
The long-pending relation with the peak power upper limit；
N value determines module, determines the N value of the long-pending correspondence closest to the peak power upper limit, and this N is counnter attack diode
Minimum number.
In one embodiment, this counnter attack diode installing analysis device also includes: first arranges unit, when N is 1,
For described counnter attack diode being located at the output loop of described photovoltaic combiner box.
In one embodiment, this counnter attack diode installing analysis device also includes: second arranges unit, when N is more than 1
Time, for each counnter attack diode is located at described photovoltaic combiner boxOn individual photovoltaic cell group string branch road, make
The individual public counnter attack diode of photovoltaic cell group string branch road.
To achieve these goals, the embodiment of the present invention also provides for a kind of photovoltaic combiner box, and many group photovoltaic module strings are divided into
Positive and negative polarities respectively enter described header box, and described header box includes: a plurality of cable, multiple fuses, a chopper,
One spark gap and at least one counnter attack diode；
One end of m bar cable therein is connected to photovoltaic group string positive pole by different electrode input end mouths, separately respectively
One end is commonly connected to cathode output end mouth by a positive output cable, and described m bar cable is equipped with fuse；
Other n bar cable one end is connected to photovoltaic group string positive pole, the other end by different negative input mouths respectively
It is commonly connected to cathode output end mouth by a negative output cable；
Described chopper is arranged on described positive output cable；
Described spark gap is connected between described positive output cable and negative output cable；
Described counnter attack diode is arranged on described positive output cable or wherein one shared one of described m bar cable
Individual counnter attack diode.
In one embodiment, the number of described counnter attack diode is 1, is arranged on described positive output cable.
In one embodiment, the number of described counnter attack diode is N, oftenBar cable shares one of them counnter attack two pole
Pipe.
Utilize the present invention, the minimum number needing counnter attack diode to be mounted can be analyzed, to solve in local photovoltaic group
The when that part being blocked, reduce the anti-electric current that fills in header box, reduce caused by counnter attack N
Power attenuation, improves the operational efficiency of photovoltaic generating system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
It is some embodiments of the present invention, for those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the photovoltaic combiner box of one embodiment of the invention；
Fig. 2 is the structural representation of the photovoltaic combiner box of another embodiment of the present invention；
Fig. 3 is the counnter attack diode installing analysis method flow diagram of one embodiment of the invention；
Fig. 4 is the counnter attack diode installing analysis method flow diagram of another embodiment of the present invention；
Fig. 5 is the U-I characteristic curve schematic diagram of the embodiment of the present invention；
Fig. 6 be the determination of one embodiment of the invention counnter attack diode when reversing current through reverse current verification
The method flow diagram of little number；
Fig. 7 is that the determination of another embodiment of the present invention reverses current through counnter attack diode when reverse current verifies
The method flow diagram of minimum number；
Fig. 8 is the structured flowchart of the counnter attack diode installing analysis device of the embodiment of the present invention；
Fig. 9 is the structured flowchart of the reverse current signal generating unit of the embodiment of the present invention；
Figure 10 is the structured flowchart that the number of the embodiment of the present invention one determines unit；
Figure 11 is the structured flowchart that the number of the embodiment of the present invention two determines unit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.
Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of photovoltaic combiner box, and how group photovoltaic module strings are divided into positive and negative polarities respectively enters described
Header box, this header box includes:
A plurality of cable, multiple fuses, a chopper, a spark gap and at least one counnter attack diode；
One end of m bar cable therein is connected to photovoltaic group string positive pole by different electrode input end mouths, separately respectively
One end is commonly connected to cathode output end mouth by a positive output cable, and described m bar cable is equipped with fuse；
Other n bar cable one end is connected to photovoltaic group string positive pole, the other end by different negative input mouths respectively
It is commonly connected to cathode output end mouth by a negative output cable；
Described chopper is arranged on described positive output cable；
Described spark gap is connected between described positive output cable and negative output cable；
Described counnter attack diode is arranged on described positive output cable or wherein one shared one of described m bar cable
Individual counnter attack diode.
The number of counnter attack diode and position can be set as the case may be, illustrate separately below.
As it is shown in figure 1, the embodiment of the present invention provides a kind of photovoltaic combiner box, many group photovoltaic module strings to be divided into positive and negative polarities
Respectively enteing described header box, this header box includes: a plurality of cable, multiple fuses 12, a chopper 13,
Spark gap 14 and a counnter attack diode 11.
One end of m bar cable 10 therein is just being connected to photovoltaic group string by different electrode input end mouths 40 respectively
Pole (such as photovoltaic array 1 (+)), the other end is commonly connected to cathode output end mouth 50 by a positive output cable 30,
M bar cable is equipped with fuse 12.
Other n bar cable 20 one end is connected to photovoltaic group string positive pole by different negative input mouths 60 respectively,
The other end is commonly connected to cathode output end mouth 70 by a negative output cable 80.
Chopper 13 is arranged on positive output cable 30, and spark gap 14 is connected to positive output cable 30 and negative pole
Between output cable 80；
Counnter attack diode 11 is arranged on positive output cable 30.
Such as Fig. 2, the embodiment of the present invention provides a kind of photovoltaic combiner box, many group photovoltaic module strings to be divided into positive and negative polarities respectively
Entering described header box, this header box includes: a plurality of cable, multiple fuses 12, and a chopper 13, is taken shelter from the thunder
Device 14 and N number of counnter attack diode 11.In Fig. 2, only it is equal to nIllustrate, be not intended to limit.
One end of m bar cable 10 therein is just being connected to photovoltaic group string by different electrode input end mouths 40 respectively
Pole (such as photovoltaic array 1 (+)), the other end is commonly connected to cathode output end mouth 50 by a positive output cable 30,
M bar cable is equipped with fuse 12.
Other n bar cable 20 one end is connected to photovoltaic group string positive pole by different negative input mouths 60 respectively,
The other end is commonly connected to cathode output end mouth 70 by a negative output cable 80.
Chopper 13 is arranged on positive output cable 30, and spark gap 14 is connected to positive output cable 30 and negative pole
Between output cable 80；
OftenBar cable shares one of them counnter attack diode, and in Fig. 2, every 2 cables share one of them counnter attack
Diode.
May each comprise measurement module 15 in the photovoltaic combiner box of Fig. 1 and Fig. 2, this measurement module 15 can be voltage
Table or ammeter.It addition, cathode output end mouth 70 and cathode output end mouth 50 be connected to adjacent segment photovoltaic combiner box or
Person is connected to inverter.
The number of the counnter attack diode shown in Fig. 1 is minimum 1, the counnter attack diode of the embodiment shown in Fig. 2
Number is N, should be noted that it is that counnter attack diode number needs the operating mode meeting the photovoltaic module string being blocked to be steady
State operating mode, different situation counnter attack diode numbers may be different, the following detailed description of.
In the operation of photovoltaic generating system, owing to outside environmental elements disturbance (such as causes due to cloud layer or dust
Photovoltaic module string cover), it will produce inevitable system disturbance.In the case, photovoltaic module in parallel
String output voltage is different；If parallel photovoltaic component string is installed without counnter attack diode, DC side current flowing backwards will be caused,
Affect the normal power output of header box and inverter, even affect the safe and stable operation of photovoltaic battery panel.Therefore,
Electric parameter detection fast and accurately and fault diagnosis properly functioning most important for photovoltaic generating system of excision.
In order to prevent above-mentioned situation from occurring, header box should possess quickly detection, the abnormal function inputting electricity in location,
To identify rapidly the unbalanced input caused because of device failure, the problem of covering, it is ensured that the input voltage of each photovoltaic module string,
Electric current is consistent, it is to avoid issuable energy loss.For this reason, it is necessary to the monitoring mode of header box is studied,
To choose suitable electric parameter and senser element, it is achieved fault diagnosis detection fast and accurately；Meanwhile, reply prison
Point position is optimized, rationally to reduce the loss of header box instrument and to ensure that it is properly functioning, for photovoltaic combiner box
Correct configuration theoretical foundation is provided.
When certain optical crosstalk photovoltaic assembly string is blocked, it is connected to the every other photovoltaic module string of 1 photovoltaic combiner box all
Reverse current will be provided for this photovoltaic module string, and be connected to the photovoltaic module string of other header boxs of 1 inverter
Owing to the effect of this loop counnter attack diode will not provide reverse current for this optical crosstalk photovoltaic assembly.
Assume that, at a header box having m bar input branch road, its input branch road is not provided with counnter attack diode, output
Circuit in series counnter attack diode.In m bar branch road, having the photovoltaic module string of n bar branch road to be blocked, illuminance is
200W/m2(it is preferred that n can be 1)；Remaining m-n road branch road is in accidental conditions, and its illuminance is
1000W/m2.In this case, this header box DC voltage significantly reduces (all because being blocked branches affect
The DC voltage on road is all clamped to equal magnitude of voltage), m-n bar branch road provides reverse current for the branch road that is blocked.
Under above-mentioned stable situation, according to above-mentioned analysis, the DC voltage of each branch road of photovoltaic combiner box is identical, and electric current is full
Foot (m-n) IW=IZDW(reviewing electric current).As shown in the U-I characteristic curve of Fig. 5, it is assumed that be blocked at the beginning of assembly
Beginning running voltage, electric current are respectively UZDW1、IZDW1.If other component operation not being blocked are in identical unidirectional current
Pressure, then its current value can be very big, is unsatisfactory for voltage restrictive condition, therefore this situation unsteady drying.Hidden if increasing
The DC voltage of gear assembly is to UZDW2, under this running voltage, just meet (m-n) IW=IZDW2, then this situation
For steady state condition.
The embodiment of the present invention provides a kind of counnter attack diode installing analysis method of photovoltaic combiner box, as it is shown on figure 3, should
Counnter attack diode installing analysis method includes:
S301: obtain the reverse current I of the photovoltaic cell component being blocked according to U-I characteristic curveZDWAnd running voltage
UZDW；
S302: according to described reverse current IZDWDetermine running voltage U of the photovoltaic cell component not being blockedW；
S303: judge described running voltage UWWith described running voltage UZDWDifference whether less than voltage error amplitude limit；
If it is, carry out S304.
Voltage error amplitude limit UeSize moderate, if too big, solving result error is excessive, if the least possibility
Lead to miss steady operation point.In solution procedure, the voltage U of the assembly that is blockedZDWIt is gradually increased, current value IZDW
For negative value, and its value is gradually reduced (absolute value is gradually increased).The work of the normal work package obtained is solved by this value
Make voltage UWIt is gradually reduced and approaches UZDW。
If difference difference is relatively big (more than voltage error amplitude limit Ue), then it is assumed that do not arrive steady operation point, continue
Increase the running voltage (reducing its operating current) of the assembly that is blocked, and return the operation feelings of the S302 normal assembly of calculating
Condition, rejudge；Otherwise it is assumed that have arrived at steady operation point, jump out circulation.
S304: reverse current through the minimum number of counnter attack diode during reverse current verification described in determining.
Flow process as shown in Figure 1 understands, and the present invention obtains the reverse current of photovoltaic cell component according to U-I characteristic curve
IZDWAnd running voltage UZDW, then determine therefrom that running voltage U of the photovoltaic cell component not being blockedW, finally
According to running voltage UWWith running voltage UZDWThe size of difference determine the minimum number of counnter attack diode.By this
Method, can analyze the minimum number needing counnter attack diode to be mounted, is blocked at local light photovoltaic assembly with solution
Time, reduce the anti-electric current that fills in header box, reduce the power attenuation caused by counnter attack N.
When step S301 is embodied as, as shown in Figure 4, comprise the steps:
S401: calculate the initial reverse electric current I of the photovoltaic cell component being blocked according to U-I characteristic curveZDW0And just
Beginning running voltage UZDW0。
U-I characteristic curve according to the assembly that is blocked (can be according to the work of the characterisitic parameter of normal assembly Yu photovoltaic module
Journey mathematical model calculates), obtain the voltage U under open circuit situationoc.Then at the beginning of running voltage, reverse operation electric current
Initial value is: (Uoc, 0).
S402: according to number m, the number n of the photovoltaic cell group string that is blocked of photovoltaic cell group string and described initial anti-
To electric current IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein m=aN, N are
The number of counnter attack diode, a is positive integer；
S403: judge described initial operating voltage UW0With described initial operating voltage UZDW0Difference whether less than electricity
Hold up poor amplitude limit；If it does not, carry out S404.
S404: by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain described reverse current IZDWAnd
Running voltage UZDW。
CsFor step-length, value is moderate, it is impossible to excessive, and the operating current of the assembly that is blocked the most all increases with this step-length,
Approach steady operation point.
When S302 is embodied as, can determine, according to U-I characteristic curve as shown in Figure 5, the photovoltaic electric not being blocked
Running voltage U of pond assemblyW。
If as it is shown on figure 3, described running voltage UWWith described running voltage UZDWNot less than voltage error amplitude limit,
Counnter attack diode installing analysis method also includes:
S305: by (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDW
Determine running voltage U of the photovoltaic cell component not being blockedW；
Then the reverse current I after rejudging according to assignmentZDWRunning voltage U determinedWWith the reverse electricity after assignment
Stream IZDWCorresponding running voltage UZDWDifference whether less than voltage error amplitude limit, shown in Fig. 3, circulation is repeatedly
In generation, until the described difference stable state of photovoltaic cell component that less than described voltage error amplitude limit, obtains being blocked is reverse
Electric current IZDWAnd running voltage UZDW。
In S304, determine that the method for the minimum number of counnter attack diode when reversing current through reverse current verification has
A lot, but be intended to follow a principle, i.e. the operating mode making the photovoltaic cell component being blocked is stable state.
In one embodiment, as shown in Figure 6, S304 includes:
S601: compare the reverse current I of the stable state of the photovoltaic cell component being blockedZDW=(m-n) IW=(aN-n) IW
With maximum reverse current IfSize；
S602: determine closest to maximum reverse current IfIZDWThe N value that value is corresponding, this N is counnter attack diode
Minimum number.
The manufacturer of photovoltaic module generally provides maximum reverse current I that assembly can bearf, now can be direct
Relatively reverse current IZDWWith IfValue, judge that the configuration of counnter attack diode is whether reasonable, whether determine reverse current
Verified by reverse current.
In one embodiment, as it is shown in fig. 7, S304 includes:
S701: judge the reverse current I of stable state by the photovoltaic cell component being blockedZDWWith UZDWLong-pending and maximum
The relation of power upper limit；
S702: judge the reverse current I of stable state by the photovoltaic cell component being blockedZDWWith UZDWLong-pending and maximum
The relation of power upper limit.
When manufacturer does not provides the reverse value of current of relevant tolerance, running voltage U can be passed throughZDWTake advantage of
With reverse current IZDW, it is the power that each photovoltaic cell consumes.Generally, monomer in Commercial photovoltaic assembly
The peak power upper limit of photovoltaic cell consumption is 25W, exceedes this value, and the heat of generation may destroy monomer photovoltaic
Battery or the encapsulating material of photovoltaic module.
According to the specific size of N value, the installation of counnter attack diode includes following two situation:
If 1 N is 1, counnter attack diode is located at the output loop of described photovoltaic combiner box.
If 2 N are more than 1, each counnter attack diode is located at described photovoltaic combiner boxIndividual photovoltaic cell group string
On branch road, makeThe individual public counnter attack diode of photovoltaic cell group string branch road.
In method shown in Fig. 3, all connect a counnter attack diode in every photovoltaic module loop of photovoltaic combiner box observable index
Design energy consumption low；The design that reverse current installs backward diode than on the output loop of header box is anti-
Little to electric current.While can guarantee that photovoltaic module is not caused damage by current flowing backwards, carry high-power output as far as possible.
Utilize the present invention, the minimum number needing counnter attack diode to be mounted can be analyzed, to solve in local photovoltaic group
The when that part being blocked, reduce the anti-electric current that fills in header box, reduce caused by counnter attack N
Power attenuation, improves the operational efficiency of photovoltaic generating system.
Based on the inventive concept identical with the counnter attack diode installing analysis method shown in Fig. 3, the embodiment of the present application also carries
Supply a kind of counnter attack diode installing analysis device, as described in example below.Due to this counnter attack diode installing analysis
The principle that device solves problem is similar to counnter attack diode installing analysis method, therefore this counnter attack diode installing analysis dress
The enforcement put may refer to the enforcement of counnter attack diode installing analysis method, repeats no more in place of repetition.
The embodiment of the present invention provides the counnter attack diode installing analysis device of a kind of photovoltaic combiner box, as shown in Figure 8, is somebody's turn to do
Counnter attack diode installing analysis device includes: reverse current signal generating unit 801, and running voltage determines unit 802, sentences
Disconnected unit 803 and number determine unit 804.
Reverse current signal generating unit 801 is reverse for the photovoltaic cell component that obtains being blocked according to U-I characteristic curve
Electric current IZDWAnd running voltage UZDW；
Running voltage determines that unit 802 is for according to described reverse current IZDWDetermine the photovoltaic cell component not being blocked
Running voltage UW；
Judging unit 803 judges described running voltage UWWith described running voltage UZDWDifference whether less than voltage by mistake
Difference amplitude limit；
Counnter attack diode when number determines unit 804 for reversing current through reverse current verification described in determining
Minimum number.
In one embodiment, as it is shown in figure 9, reverse current signal generating unit includes: initial current computing module 901, electricity
Pressure computing module 902, amplitude limit judge module 903 and reverse current computing module 904.
Initial current computing module 901 for calculating the initial of the photovoltaic cell component that is blocked according to U-I characteristic curve
Reverse current IZDW0And initial operating voltage UZDW0；
Voltage computing module 902 is for the number m according to photovoltaic cell group string, the number of the photovoltaic cell group string that is blocked
N and described initial reverse electric current IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein
M=aN, N are the number of counnter attack diode, and a is positive integer；
Amplitude limit judge module 903 is used for judging described initial operating voltage UW0With described initial operating voltage UZDW0's
Whether difference is less than voltage error amplitude limit；
Reverse current computing module 904 is for by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain
Described reverse current IZDWAnd running voltage UZDW。
In one embodiment, running voltage determine unit 802 specifically for: according to described U-I characteristic curve determine not by
Running voltage U of the photovoltaic cell component blockedW。
In one embodiment, counnter attack diode installing analysis device also includes:
Assignment unit, when described running voltage UWWith described running voltage UZDWDuring not less than voltage error amplitude limit, use
In by (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine not by
Running voltage U of the photovoltaic cell component blockedW；Judging unit 803 rejudge according to assignment after reverse current
IZDWRunning voltage U determinedWWith the reverse current I after assignmentZDWCorresponding running voltage UZDWDifference the least
In voltage error amplitude limit.
In one embodiment, as shown in Figure 10, number determines that unit includes:
Comparison module 1001, for comparing the reverse current of the stable state of the photovoltaic cell component being blocked
IZDW=(m-n) IW=(aN-n) IWWith maximum reverse current IfSize；
N value determines module 1002, is used for determining closest to maximum reverse current IfIZDWThe N value that value is corresponding, should
N is the minimum number of counnter attack diode.
In one embodiment, as shown in figure 11, number determines that unit includes:
Upper limit judge module 1101, for judging the reverse current I of the stable state by the photovoltaic cell component being blockedZDW
With UZDWThe long-pending relation with the peak power upper limit；
N value determines module 1102, determines the N value of the long-pending correspondence closest to the peak power upper limit, and this N is counnter attack two
The minimum number of pole pipe.
In one embodiment, counnter attack diode installing analysis device also includes: first arranges unit, when N is 1,
For described counnter attack diode being located at the output loop of described photovoltaic combiner box.
In one embodiment, counnter attack diode installing analysis device also includes: second arranges unit, when N is more than 1,
For each counnter attack diode is located at described photovoltaic combiner boxOn individual photovoltaic cell group string branch road, makeIndividual light
The volt public counnter attack diode of set of cells string branch road.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer journey
Sequence product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware
The form of the embodiment of aspect.And, the present invention can use and wherein include computer available programs one or more
The computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) of code
The form of the computer program of upper enforcement.
The present invention is with reference to method, equipment (system) and the stream of computer program according to embodiments of the present invention
Journey figure and/or block diagram describe.It should be understood that can be by computer program instructions flowchart and/or block diagram
Flow process in each flow process and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These can be provided
Computer program instructions processes to general purpose computer, special-purpose computer, Embedded Processor or other programmable datas and sets
Standby processor is to produce a machine so that held by the processor of computer or other programmable data processing device
The instruction of row produces for realizing one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple side
The device of the function specified in frame.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces bag
Including the manufacture of command device, this command device realizes at one flow process of flow chart or multiple flow process and/or block diagram one
The function specified in individual square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
On calculation machine or other programmable devices, execution sequence of operations step is to produce computer implemented process, thus is calculating
The instruction performed on machine or other programmable devices provide for realizing in one flow process of flow chart or multiple flow process and/or
The step of the function specified in one square frame of block diagram or multiple square frame.
The present invention applies specific embodiment principle and the embodiment of the present invention are set forth, above example
Explanation be only intended to help to understand method and the core concept thereof of the present invention；General technology simultaneously for this area
Personnel, according to the thought of the present invention, the most all will change, in sum,
This specification content should not be construed as limitation of the present invention.
Claims (19)
1. the counnter attack diode installing analysis method of a photovoltaic combiner box, it is characterised in that including:
The reverse current I of the photovoltaic cell component being blocked is obtained according to U-I characteristic curveZDWAnd running voltage UZDW；
According to described reverse current IZDWDetermine running voltage U of the photovoltaic cell component not being blockedW；
Judge described running voltage UWWith described running voltage UZDWDifference whether less than voltage error amplitude limit；
If it is, the minimum number of counnter attack diode when reversing current through reverse current verification described in determining.
The counnter attack diode installing analysis method of photovoltaic combiner box the most according to claim 1, it is characterised in that
The reverse current I of the described photovoltaic cell component obtaining according to U-I characteristic curve being blockedZDWAnd running voltage UZDW,
Including:
The initial reverse electric current I of the photovoltaic cell component being blocked is calculated according to U-I characteristic curveZDW0And initialization
Voltage UZDW0；
Number m, the number n of the photovoltaic cell group string that is blocked and described initial reverse electric current according to photovoltaic cell group string
IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein m=aN, N are counnter attack two pole
The number of pipe, a is positive integer；
Judge described initial operating voltage UW0With described initial operating voltage UZDW0Difference whether less than voltage error
Amplitude limit；
If it does not, by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain described reverse current IZDW
And running voltage UZDW。
The counnter attack diode installing analysis method of photovoltaic combiner box the most according to claim 1, it is characterised in that
Described according to described reverse current IZDWDetermine running voltage U of the photovoltaic cell component not being blockedW, including:
Running voltage U of the photovoltaic cell component not being blocked is determined according to described U-I characteristic curveW。
The counnter attack diode installing analysis method of photovoltaic combiner box the most according to any one of claim 1 to 3,
It is characterized in that, if described running voltage UWWith described running voltage UZDWNot less than voltage error amplitude limit, also wrap
Include:
By (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine not
Running voltage U of the photovoltaic cell component being blockedW；
Reverse current I after rejudging according to assignmentZDWRunning voltage U determinedWWith the reverse current after assignment
IZDWCorresponding running voltage UZDWDifference whether less than voltage error amplitude limit, loop iteration, until described difference
Less than described voltage error amplitude limit, obtain the reverse current I of the stable state of the photovoltaic cell component being blockedZDWAnd work electricity
Pressure UZDW。
The counnter attack diode installing analysis method of photovoltaic combiner box the most according to claim 2, it is characterised in that
The minimum number of counnter attack diode during reverse current verification is reversed current through described in determining, including:
The reverse current I of the stable state of the photovoltaic cell component being relatively blockedZDW=(m-n) IW=(aN-n) IWWith
Big reverse current IfSize；
Determine closest to maximum reverse current IfIZDWThe N value that value is corresponding, this N is minimum of counnter attack diode
Number.
The counnter attack diode installing analysis method of photovoltaic combiner box the most according to claim 2, it is characterised in that
The minimum number of counnter attack diode during reverse current verification is reversed current through described in determining, including:
Judge the reverse current I of stable state by the photovoltaic cell component being blockedZDWWith UZDWLong-pending with in peak power
The relation of limit；
Determining the N value of the long-pending correspondence closest to the peak power upper limit, this N is the minimum number of counnter attack diode.
7. according to the counnter attack diode installing analysis method of the photovoltaic combiner box described in claim 5 or 6, its feature
It is, also includes:
If N is 1, described counnter attack diode is located at the output loop of described photovoltaic combiner box.
8. according to the counnter attack diode installing analysis method of the photovoltaic combiner box described in claim 5 or 6, its feature
It is, also includes:
If N is more than 1, each counnter attack diode is located at described photovoltaic combiner boxIndividual photovoltaic cell group string props up
Lu Shang, makesThe individual public counnter attack diode of photovoltaic cell group string branch road.
9. the counnter attack diode installing analysis device of a photovoltaic combiner box, it is characterised in that including:
Reverse current signal generating unit, the reverse electricity of the photovoltaic cell component for obtaining being blocked according to U-I characteristic curve
Stream IZDWAnd running voltage UZDW；
Running voltage determines unit, for according to described reverse current IZDWDetermine the photovoltaic cell component that is not blocked
Running voltage UW；
Judging unit, it is judged that described running voltage UWWith described running voltage UZDWDifference whether less than voltage error
Amplitude limit；
Number determines unit, the minimum of counnter attack diode during for reversing current through reverse current verification described in determining
Number.
The counnter attack diode installing analysis device of photovoltaic combiner box the most according to claim 9, it is characterised in that
Described reverse current signal generating unit includes:
Initial current computing module, for calculating the initial anti-of the photovoltaic cell component that is blocked according to U-I characteristic curve
To electric current IZDW0And initial operating voltage UZDW0；
Voltage computing module, for number m, the number n of the photovoltaic cell group string that is blocked according to photovoltaic cell group string
And described initial reverse electric current IZDW0Calculate the initial operating voltage U of the photovoltaic cell component not being blockedW0, wherein
M=aN, N are the number of counnter attack diode, and a is positive integer；
Amplitude limit judge module, is used for judging described initial operating voltage UW0With described initial operating voltage UZDW0Difference
Whether value is less than voltage error amplitude limit；
Reverse current computing module, for by (IZDW0-Cs) it is assigned to described initial reverse electric current IZDW0, obtain institute
State reverse current IZDWAnd running voltage UZDW。
The counnter attack diode installing analysis device of 11. photovoltaic combiner boxes according to claim 9, it is characterised in that
Described running voltage determine unit specifically for: determine the photovoltaic cell group not being blocked according to described U-I characteristic curve
Running voltage U of partW。
12. according to the counnter attack diode installing analysis device of the photovoltaic combiner box according to any one of claim 9-11,
It is characterized in that, also include:
Assignment unit, when described running voltage UWWith described running voltage UZDWDuring not less than voltage error amplitude limit, use
In by (IZDW-Cs) it is assigned to described reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine not by
Running voltage U of the photovoltaic cell component blockedW；Described judging unit rejudge according to assignment after reverse current
IZDWRunning voltage U determinedWWith the reverse current I after assignmentZDWCorresponding running voltage UZDWDifference the least
In voltage error amplitude limit.
The counnter attack diode installing analysis device of 13. photovoltaic combiner boxes according to claim 10, its feature exists
In, described number determines that unit includes:
Comparison module, for comparing the reverse current of the stable state of the photovoltaic cell component being blocked
IZDW=(m-n) IW=(aN-n) IWWith maximum reverse current IfSize；
N value determines module, is used for determining closest to maximum reverse current IfIZDWThe N value that value is corresponding, this N is
The minimum number of counnter attack diode.
The counnter attack diode installing analysis device of 14. photovoltaic combiner boxes according to claim 10, its feature exists
In, described number determines that unit includes:
Upper limit judge module, for judging the reverse current I of the stable state by the photovoltaic cell component being blockedZDWWith UZDW
The long-pending relation with the peak power upper limit；
N value determines module, determines the N value of the long-pending correspondence closest to the peak power upper limit, and this N is counnter attack diode
Minimum number.
15. according to the counnter attack diode installing analysis device of the photovoltaic combiner box described in claim 13 or 14, and it is special
Levy and be, also include: first arranges unit, when N is 1, for described counnter attack diode is located at described light
The output loop of volt header box.
16. according to the counnter attack diode installing analysis device of the photovoltaic combiner box described in claim 13 or 14, and it is special
Levy and be, also include: second arranges unit, when N is more than 1, described for each counnter attack diode is located at
Photovoltaic combiner boxOn individual photovoltaic cell group string branch road, makeThe individual public counnter attack two of photovoltaic cell group string branch road
Pole is managed.
17. 1 kinds of photovoltaic combiner boxes, many group photovoltaic module strings are divided into positive and negative polarities and respectively enter described header box, and it is special
Levying and be, described header box includes: a plurality of cable, multiple fuses, and a chopper, a spark gap and at least one are anti-
Anti-diode；
One end of m bar cable therein is connected to photovoltaic group string positive pole by different electrode input end mouths, separately respectively
One end is commonly connected to cathode output end mouth by a positive output cable, and described m bar cable is equipped with fuse；
Other n bar cable one end is connected to photovoltaic group string positive pole, the other end by different negative input mouths respectively
It is commonly connected to cathode output end mouth by a negative output cable；
Described chopper is arranged on described positive output cable；
Described spark gap is connected between described positive output cable and negative output cable；
Described counnter attack diode is arranged on described positive output cable or wherein one shared one of described m bar cable
Individual counnter attack diode.
18. photovoltaic combiner boxes according to claim 17, it is characterised in that the number of described counnter attack diode
It is 1, is arranged on described positive output cable.
19. photovoltaic combiner boxes according to claim 17, it is characterised in that the number of described counnter attack diode
For N, oftenBar cable shares one of them counnter attack diode.
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