CN105978483B - Photovoltaic combiner box and its counnter attack diode installing analysis method, apparatus - Google Patents
Photovoltaic combiner box and its counnter attack diode installing analysis method, apparatus Download PDFInfo
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- CN105978483B CN105978483B CN201510849492.6A CN201510849492A CN105978483B CN 105978483 B CN105978483 B CN 105978483B CN 201510849492 A CN201510849492 A CN 201510849492A CN 105978483 B CN105978483 B CN 105978483B
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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 present invention, which provides a kind of photovoltaic combiner box and its counnter attack diode installing analysis method, apparatus, the counnter attack diode installing analysis method, to be included：The reverse current IZDW of photovoltaic cell component and operating voltage UZDW being blocked according to U I characteristic curves；The operating voltage UW for the photovoltaic cell component not being blocked is determined according to the reverse current IZDW；Judge whether the difference of the operating voltage UW and operating voltage UZDW is less than voltage error amplitude limit；If so, determine the minimum number for reversing current through counnter attack diode when reverse current verifies.Utilize the present invention, can analyze needs the minimum number of counnter attack diode to be mounted, to solve when local photovoltaic module is blocked, reduces the anti-sink current in header box, the power attenuation caused by counnter attack diode conduction voltage drop is reduced, improves the operational efficiency of photovoltaic generating system.
Description
Technical field
The present invention relates to photovoltaic combiner box Energy Efficiency Analysis technology, especially with regard to a kind of photovoltaic combiner box and its counnter attack two
Pole pipe installing analysis method, apparatus.
Background technology
With the continuous aggravation of economic sustainable development and environmental pollution, the development and utilization of regenerative resource has become
Trend of the times.According to the energy strategy policy of country, solar photovoltaic technology can efficiently solve energy shortage and drop
The problem of low-carbon emission.How photovoltaic efficiency is improved, the various components and link to photovoltaic generation carry out Energy Efficiency Analysis then
It is particularly important.Header box as the merging of several photovoltaic module string electric currents is summarized the important ring that is input in inverter, it is necessary to
Analyze and study the power attenuation in its course of work.
Entitled photovoltaic array conflux box (the number of patent application for solar photovoltaic generation system：
One section that the series connection of each photovoltaic string formation is connected to fuse is proposed in Chinese patent 201020564614.X), fuse
Another input pole for being connected to counnter attack diode, the output stage of counnter attack diode are connected to positive negative busbar by current detection module
On.But this patent can generate certain pressure during the work time while counnter attack diode is in circulation between preventing each string formation
It drops (about 0.7V), it is corresponding to generate certain power attenuation.
The content of the invention
An embodiment of the present invention provides a kind of photovoltaic combiner box and its counnter attack diode installing analysis method, apparatus, to divide
Analysis needs the minimum number of counnter attack diode to be mounted, to solve when local photovoltaic module is blocked, reduces header box
Interior anti-sink current, reduces the power attenuation caused by counnter attack diode conduction voltage drop, improves the fortune of photovoltaic generating system
Line efficiency.
To achieve these goals, an embodiment of the present invention provides a kind of counnter attack diode installing analysis of photovoltaic combiner box
Method, the counnter attack diode installing analysis method include：
According to the reverse current I for the photovoltaic cell component that U-I characteristic curves are blockedZDWAnd operating voltage UZDW；
According to the reverse current IZDWDetermine the operating voltage U for the photovoltaic cell component not being blockedW；
Judge the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error amplitude limit；
If so, determine the minimum number for reversing current through counnter attack diode when reverse current verifies.
In one embodiment, the reverse current I of the photovoltaic cell component being blocked according to U-I characteristic curvesZDWAnd
Operating voltage UZDW, including：
According to the initial reverse electric current I for the photovoltaic cell component that the calculating of U-I characteristic curves is blockedZDW0And initialization electricity
Press UZDW0；
According to the number m of photovoltaic cell string formation, the number n for the photovoltaic cell string formation that is blocked and the initial reverse electric current
IZDW0Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N are the number of counnter attack diode,
A is positive integer；
Judge the initial operating voltage UW0With the initial operating voltage UZDW0Difference whether be less than voltage error limit
Width；
If not, by (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain the reverse current IZDWAnd work
Voltage UZDW。
It is described according to the reverse current I in one embodimentZDWDetermine the work electricity for the photovoltaic cell component not being blocked
Press UW, including：
The operating voltage U for the photovoltaic cell component not being blocked is determined according to the U-I characteristic curvesW。
In one embodiment, if the operating voltage UWWith the operating voltage UZDWNot less than voltage error amplitude limit, also wrap
It includes：
By (IZDW-Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWIt determines not hidden
The operating voltage U of the photovoltaic cell component of gearW；
It rejudges according to the reverse current I after assignmentZDWDefinite operating voltage UWWith the reverse current I after assignmentZDW
Corresponding operating voltage UZDWDifference whether be less than voltage error amplitude limit, loop iteration, until the difference be less than the voltage
Error amplitude limit, the reverse current I of the stable state for the photovoltaic cell component being blockedZDWAnd operating voltage UZDW。
In one embodiment, the minimum number for reversing current through counnter attack diode when reverse current verifies is determined,
Including：
Compare the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW=(aN-n) IWIt is anti-with maximum
To electric current IfSize；
It determines closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is the minimum number of counnter attack diode.
In one embodiment, the minimum number for reversing current through counnter attack diode when reverse current verifies is determined,
Including：
Judge the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith UZDWProduct and the maximum power upper limit
Relation；
Determine the corresponding N values of product closest to the maximum power upper limit, which is the minimum number of counnter attack diode.
In one embodiment, which further includes：
If N is 1, the counnter attack diode is located to the output loop of the photovoltaic combiner box.
In one embodiment, which further includes：
If N is more than 1, each counnter attack diode is located at the photovoltaic combiner boxA photovoltaic cell string formation branch
On, makeA public counnter attack diode of photovoltaic cell string formation branch.
To achieve these goals, the embodiment of the present invention provides a kind of counnter attack diode installing analysis dress of photovoltaic combiner box
It puts, which includes：
Reverse current generation unit, for the reversed electricity for the photovoltaic cell component being blocked according to U-I characteristic curves
Flow IZDWAnd operating voltage UZDW；
Operating voltage determination unit, for according to the reverse current IZDWDetermine the photovoltaic cell component not being blocked
Operating voltage UW；
Judging unit judges the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error limit
Width；
Number determination unit, for determining the minimum for reversing current through counnter attack diode when reverse current verifies
Number.
In one embodiment, the reverse current generation unit includes：
Initial current computing module, for calculating the initial anti-of the photovoltaic cell component being blocked according to U-I characteristic curves
To electric current IZDW0And initial operating voltage UZDW0；
Voltage computing module, for number m, the number n for the photovoltaic cell string formation that is blocked according to photovoltaic cell string formation and
The initial reverse electric current IZDW0Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N are
The number of counnter attack diode, a are positive integer；
Amplitude limit judgment module, for judging the initial operating voltage UW0With the initial operating voltage UZDW0Difference be
It is no to be less than voltage error amplitude limit；
Reverse current computing module, for by (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain described anti-
To electric current IZDWAnd operating voltage UZDW。
In one embodiment, the operating voltage determination unit is specifically used for：It determines not hidden according to the U-I characteristic curves
The operating voltage U of the photovoltaic cell component of gearW。
In one embodiment, which further includes：
Assignment unit, as the operating voltage UWWith the operating voltage UZDWDuring not less than voltage error amplitude limit, for inciting somebody to action
(IZDW-Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine the photovoltaic electric not being blocked
The operating voltage U of pond componentW；The judging unit is rejudged according to the reverse current I after assignmentZDWDefinite operating voltage UW
With the reverse current I after assignmentZDWCorresponding operating voltage UZDWDifference whether be less than voltage error amplitude limit.
In one embodiment, the number determination unit includes：
Comparison module, for comparing the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW=
(aN-n)IWWith maximum reverse current IfSize；
N value determining modules, for determining closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is counnter attack two
The minimum number of pole pipe.
In one embodiment, the number determination unit includes：
Upper limit judgment module, for judging the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith UZDW's
The relation of product and the maximum power upper limit；
N value determining modules, determine the corresponding N values of product closest to the maximum power upper limit, which is the minimum of counnter attack diode
Number.
In one embodiment, which further includes：First setting unit when N is 1, is used for
The counnter attack diode is located to the output loop of the photovoltaic combiner box.
In one embodiment, which further includes：Second setting unit when N is more than 1, is used
In each counnter attack diode is located at the photovoltaic combiner boxA photovoltaic cell string formation branch road, makesA photovoltaic cell
The public counnter attack diode of string formation branch.
To achieve these goals, the embodiment of the present invention also provides a kind of photovoltaic combiner box, and multigroup photovoltaic module string is divided into
Positive and negative polarities respectively enter the header box, and the header box includes：A plurality of cable, multiple fuses, a breaker, one take shelter from the thunder
Device and at least a counnter attack diode；
One end of m cable therein is connected to photovoltaic string formation anode by different electrode input end mouths respectively, another
End is commonly connected to cathode output end mouth by a positive output cable, and the m cable is equipped with fuse；
N other cable one end is connected to photovoltaic string formation anode, the other end by different negative input mouths respectively
Cathode output end mouth is commonly connected to by a negative output cable；
The breaker is arranged on the positive output cable；
The arrester is connected between the positive output cable and negative output cable；
The counnter attack diode is arranged on the positive output cable or wherein one of the m cable shares one
Counnter attack diode.
In one embodiment, the number of the counnter attack diode is 1, is arranged on the positive output cable.
In one embodiment, the number of the counnter attack diode is N, oftenBar cable shares one of counnter attack diode.
Using the present invention, the minimum number for needing counnter attack diode to be mounted can be analyzed, to solve in local photovoltaic group
When part is blocked, reduces the anti-sink current in header box, reduce the power caused by counnter attack diode conduction voltage drop
Loss improves the operational efficiency of photovoltaic generating system.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of the photovoltaic combiner box of one embodiment of the invention；
Fig. 2 is the structure diagram 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 diagrames of the embodiment of the present invention；
Fig. 6 is the definite minimum for reversing current through counnter attack diode when reverse current verifies of one embodiment of the invention
The method flow diagram of number；
Fig. 7 be another embodiment of the present invention it is definite reverse current through reverse current verification when counnter attack diode most
The method flow diagram of small number；
Fig. 8 is the structure diagram of the counnter attack diode installing analysis device of the embodiment of the present invention；
Fig. 9 is the structure diagram of the reverse current generation unit of the embodiment of the present invention；
Figure 10 is the structure diagram of the number determination unit of the embodiment of the present invention one；
Figure 11 is the structure diagram of the number determination unit of the embodiment of the present invention two.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of photovoltaic combiner box, multigroup photovoltaic module string be divided into positive and negative polarities respectively enter it is described
Header box, the header box include：
A plurality of cable, multiple fuses, a breaker, an arrester and an at least counnter attack diode；
One end of m cable therein is connected to photovoltaic string formation anode by different electrode input end mouths respectively, another
End is commonly connected to cathode output end mouth by a positive output cable, and the m cable is equipped with fuse；
N other cable one end is connected to photovoltaic string formation anode, the other end by different negative input mouths respectively
Cathode output end mouth is commonly connected to by a negative output cable；
The breaker is arranged on the positive output cable；
The arrester is connected between the positive output cable and negative output cable；
The counnter attack diode is arranged on the positive output cable or wherein one of the m cable shares one
Counnter attack diode.
The number of counnter attack diode and position can be set as the case may be, be illustrated separately below.
As shown in Figure 1, the embodiment of the present invention provides a kind of photovoltaic combiner box, multigroup photovoltaic module string is divided into positive and negative polarities point
Not Jin Ru the header box, which includes：A plurality of cable, multiple fuses 12, a breaker 13, an arrester 14 and one
A counnter attack diode 11.
One end of m cable 10 therein is connected to photovoltaic string formation anode by different electrode input end mouths 40 respectively
(such as photovoltaic array 1 (+)), the other end are commonly connected to cathode output end mouth 50 by a positive output cable 30, and m cable is equal
Equipped with fuse 12.
Other 20 one end of n cable is connected to photovoltaic string formation anode by different negative input mouths 60 respectively, separately
One end is commonly connected to cathode output end mouth 70 by a negative output cable 80.
Breaker 13 is arranged on positive output cable 30, and arrester 14 is connected to positive output cable 30 and is exported with cathode
Between 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, multigroup photovoltaic module string be divided into positive and negative polarities respectively into
Enter the header box, which includes：A plurality of cable, multiple fuses 12, a breaker 13, an arrester 14 and N number of anti-
Anti- diode 11.In Fig. 2, only it is equal to nFor example, it is not intended to limit.
One end of m cable 10 therein is connected to photovoltaic string formation anode by different electrode input end mouths 40 respectively
(such as photovoltaic array 1 (+)), the other end are commonly connected to cathode output end mouth 50 by a positive output cable 30, and m cable is equal
Equipped with fuse 12.
Other 20 one end of n cable is connected to photovoltaic string formation anode by different negative input mouths 60 respectively, separately
One end is commonly connected to cathode output end mouth 70 by a negative output cable 80.
Breaker 13 is arranged on positive output cable 30, and arrester 14 is connected to positive output cable 30 and is exported with cathode
Between cable 80；
OftenBar cable shares one of counnter attack diode, and in Fig. 2, every 2 cables share one of two pole of counnter attack
Pipe.
May each comprise measurement module 15 in the photovoltaic combiner box of Fig. 1 and Fig. 2, the measurement module 15 can be voltmeter or
Ammeter.In addition, cathode output end mouth 70 and cathode output end mouth 50 are connected to adjacent segment photovoltaic combiner box or are connected to inverse
Become device.
The number of counnter attack diode shown in FIG. 1 be minimum 1, the counnter attack diode of embodiment shown in Fig. 2
For number for N, it is necessary to which noticing is, counnter attack diode number needs to meet the operating mode for the photovoltaic module string being blocked for steady state condition,
Different situation counnter attack diode numbers may be different, the following detailed description of.
In the operation of photovoltaic generating system, since outside environmental elements disturbance is (such as since cloud layer or dust cause
Photovoltaic module string masking), it will generate inevitable system disturbance.In the case, photovoltaic module string in parallel output
Voltage is different；If parallel photovoltaic component string without counnter attack diode install, DC side current flowing backwards will be caused, influence header box and
The normal power output of inverter or even the safe and stable operation for influencing photovoltaic battery panel.Therefore, fast and accurately electric parameter is examined
It surveys and fault diagnosis excision is most important for the normal operation of photovoltaic generating system.
The above situation occurs in order to prevent, and header box should possess quick detection, the function of the abnormal input electricity of positioning, with
Rapid identification unbalanced input caused by device failure, masking problem ensures input voltage, the electric current one of each photovoltaic module string
It causes, avoids issuable energy loss.For this reason, it is necessary to the monitoring mode of header box is studied, it is suitable to choose
Electric parameter and senser element realize that fast and accurately fault diagnosis detects；At the same time, reply monitoring location optimizes,
Rationally to reduce the loss of header box instrument and ensure its normal operation, for photovoltaic combiner box correct configuration provide it is theoretical according to
According to.
When certain optical crosstalk volt component string is blocked, the every other photovoltaic module string of 1 photovoltaic combiner box is connected to all
Reverse current will be provided by photovoltaic module string therefore, and be connected to the photovoltaic module strings of other header boxs of 1 inverter due to
The effect of the circuit counnter attack diode will not go here and there therefore photovoltaic module provide reverse current.
Assuming that there is the header box of m items input branch at one, input branch is not provided with counnter attack diode, output loop
Series connection counnter attack diode.In m branch, the photovoltaic module string for having n branch is blocked, illuminance 200W/m2(preferably
1) ground, n can be；Remaining m-n roads branch is in accidental conditions, illuminance 1000W/m2.In this case, should
Header box DC voltage because be blocked branches affect due to significantly reduce that (DC voltage of all branches is clamped to equal electricity
Pressure value), m-n branch provides reverse current for the branch that is blocked.
Under above-mentioned stable situation, according to above-mentioned analysis, the DC voltage of each branch of photovoltaic combiner box is identical, and electric current meets
(m-n)IW=IZDW(reviewing electric current).As shown in the U-I characteristic curves of Fig. 5, it is assumed that initial operating voltage, the electricity for the component that is blocked
Stream is respectively UZDW1、IZDW1.If other component operations not being blocked, in identical DC voltage, current value can be very big, no
Meet voltage restrictive condition, therefore the situation unsteady drying.If increase is blocked, the DC voltage of component is to UZDW2, in the work
Make to meet (m-n) I under voltage justW=IZDW2, then the situation is steady state condition.
The embodiment of the present invention provides a kind of counnter attack diode installing analysis method of photovoltaic combiner box, as shown in figure 3, this is anti-
Anti- diode installing analysis method includes：
S301：According to the reverse current I for the photovoltaic cell component that U-I characteristic curves are blockedZDWAnd operating voltage
UZDW；
S302：According to the reverse current IZDWDetermine the operating voltage U for the photovoltaic cell component not being blockedW；
S303：Judge the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error amplitude limit；Such as
Fruit is to carry out S304.
Voltage error amplitude limit UeSize it is moderate, solving result error is excessive if too big, if too small may lead
Steady operation point is missed in cause.In solution procedure, the voltage U for the component that is blockedZDWGradually increase, current value IZDWFor negative value, and
Its value is gradually reduced (absolute value gradually increases).By the operating voltage U for the normal work component that the value solvesWIt is gradually reduced
And approach UZDW。
If difference difference is larger (to be more than voltage error amplitude limit Ue), then it is assumed that steady operation point is not reached, continues to increase
The operating voltage (reducing its operating current) of the big component that is blocked, and return to the operating condition, again that S302 calculates normal component
Judge；Otherwise it is assumed that having arrived at steady operation point, Xun Huan is jumped out.
S304：Determine the minimum number for reversing current through counnter attack diode when reverse current verifies.
Flow as shown in Figure 1 understands that the present invention obtains the reverse current of photovoltaic cell component according to U-I characteristic curves
IZDWAnd operating voltage UZDW, then determine therefrom that the operating voltage U of the photovoltaic cell component not being blockedW, finally according to work
Voltage UWWith operating voltage UZDWThe size of difference determine the minimum number of counnter attack diode.In this way, can analyze needs
The minimum number of counnter attack diode to be mounted to solve when local photovoltaic module is blocked, reduces in header box
Anti- sink current reduces the power attenuation caused by counnter attack diode conduction voltage drop.
Step S301 is when it is implemented, as shown in figure 4, include the following steps：
S401：According to the initial reverse electric current I for the photovoltaic cell component that the calculating of U-I characteristic curves is blockedZDW0It is and initial
Operating voltage UZDW0。
It (can be according to the characterisitic parameter of normal component and the work of photovoltaic module according to the U-I characteristic curves for the component that is blocked
Journey mathematical model is calculated), obtain the voltage U under open circuit situationoc.Then operating voltage, the initial value of reverse operation electric current are：
(Uoc, 0).
S402：According to the number m of photovoltaic cell string formation, the number n for the photovoltaic cell string formation that is blocked and the initial reverse
Electric current IZDW0Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N are counnter attack diode
Number, a are positive integer；
S403：Judge the initial operating voltage UW0With the initial operating voltage UZDW0Difference whether be less than voltage miss
Poor amplitude limit；If not, carry out S404.
S404：By (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain the reverse current IZDWAnd work electricity
Press UZDW。
CsFor step-length, value is moderate, it is impossible to and excessive, the operating current for the component that is blocked is increased every time with the step-length,
Approach steady operation point.
S302 is when it is implemented, the photovoltaic cell group not being blocked can be determined according to U-I characteristic curves as shown in Figure 5
The operating voltage U of partW。
If the as shown in figure 3, operating voltage UWWith the operating voltage UZDWNot less than voltage error amplitude limit, counnter attack
Diode installing analysis method further includes：
S305：By (IZDW-Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWIt determines
The operating voltage U for the photovoltaic cell component not being blockedW；
Then rejudge according to the reverse current I after assignmentZDWDefinite operating voltage UWWith the reverse current after assignment
IZDWCorresponding operating voltage UZDWDifference whether be less than voltage error amplitude limit, according to shown in Fig. 3, loop iteration, until described
Difference is less than the voltage error amplitude limit, the reverse current I of the stable state for the photovoltaic cell component being blockedZDWAnd work electricity
Press UZDW。
In S304, the method for the minimum number of counnter attack diode when determining to reverse current through reverse current verification has very
It is more, but to follow a principle, i.e. so that the operating mode for the photovoltaic cell component being blocked is stable state.
In one embodiment, as shown in fig. 6, S304 includes：
S601：Compare the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW=(aN-n) IWWith
Maximum reverse current IfSize；
S602：It determines closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is the minimum of counnter attack diode
Number.
The manufacturer of photovoltaic module generally provides the maximum reverse current I that component can be bornf, at this time can be direct
Compare reverse current IZDWWith IfValue, to judge whether the configuration of counnter attack diode reasonable, determine reverse current whether by anti-
It is verified to electric current.
In one embodiment, as shown in fig. 7, S304 includes：
S701：Judge the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith UZDWProduct and maximum power
The relation of the upper limit；
S702：Determine the corresponding N values of product closest to the maximum power upper limit, which is the minimum number of counnter attack diode.
In the case of manufacturer does not provide the reverse value of current of related tolerance, operating voltage U can be passed throughZDWIt is multiplied by
Reverse current IZDW, it is the power that each photovoltaic cell consumes.Under normal circumstances, monomer photovoltaic cell in Commercial photovoltaic component
The maximum power upper limit of consumption is 25W, and more than the value, the heat of generation will likely destroy monomer photovoltaic cell or photovoltaic module
Encapsulating material.
According to the specific size of N values, the installation of counnter attack diode includes following two situation：
If the 1, N is 1, counnter attack diode is located to the output loop of the photovoltaic combiner box.
If the 2, N is more than 1, each counnter attack diode is located at the photovoltaic combiner boxA photovoltaic cell string formation branch
On, makeA public counnter attack diode of photovoltaic cell string formation branch.
In method shown in Fig. 3, every photovoltaic module circuit of photovoltaic combiner box energy consumption ratio is all connected a counnter attack diode
Design energy consumption it is low；Reverse current electricity more reversed than the designing scheme that backward dioded is installed on the output loop of header box
It flows small.While can guarantee that photovoltaic module is not damaged by current flowing backwards, power output is improved as far as possible.
Using the present invention, the minimum number for needing counnter attack diode to be mounted can be analyzed, to solve in local photovoltaic group
When part is blocked, reduces the anti-sink current in header box, reduce the power caused by counnter attack diode conduction voltage drop
Loss improves the operational efficiency of photovoltaic generating system.
Based on the inventive concept identical with counnter attack diode installing analysis method shown in Fig. 3, the embodiment of the present application also carries
A kind of counnter attack diode installing analysis device is supplied, as described in example below.Due to the counnter attack diode installing analysis device
The principle solved the problems, such as is similar to counnter attack diode installing analysis method, therefore the implementation of the counnter attack diode installing analysis device
The implementation of counnter attack diode installing analysis method is may refer to, overlaps will not be repeated.
The embodiment of the present invention provides a kind of counnter attack diode installing analysis device of photovoltaic combiner box, as shown in figure 8, this is anti-
Anti- diode installing analysis device includes：Reverse current generation unit 801, operating voltage determination unit 802, judging unit 803
And number determination unit 804.
Reverse current generation unit 801 is used for the reversed of the photovoltaic cell component being blocked according to U-I characteristic curves
Electric current IZDWAnd operating voltage UZDW；
Operating voltage determination unit 802 is used for according to the reverse current IZDWDetermine the photovoltaic cell component not being blocked
Operating voltage UW；
Judging unit 803 judges the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error
Amplitude limit；
Number determination unit 804 is used to determine the counnter attack diode reversed current through when reverse current verifies most
Small number.
In one embodiment, as shown in figure 9, reverse current generation unit includes：Initial current computing module 901, potentiometer
Calculate module 902, amplitude limit judgment module 903 and reverse current computing module 904.
Initial current computing module 901 is used for the initial of the photovoltaic cell component being blocked according to the calculating of U-I characteristic curves
Reverse current IZDW0And initial operating voltage UZDW0；
Voltage computing module 902 is used for number m, the number n for the photovoltaic cell string formation that is blocked according to photovoltaic cell string formation
And the initial reverse electric current IZDW0Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N
For the number of counnter attack diode, a is positive integer；
Amplitude limit judgment module 903 is used to judge the initial operating voltage UW0With the initial operating voltage UZDW0Difference
Whether voltage error amplitude limit is less than；
Reverse current computing module 904 is used for (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain described
Reverse current IZDWAnd operating voltage UZDW。
In one embodiment, operating voltage determination unit 802 is specifically used for：It determines not hidden according to the U-I characteristic curves
The operating voltage U of the photovoltaic cell component of gearW。
In one embodiment, counnter attack diode installing analysis device further includes：
Assignment unit, as the operating voltage UWWith the operating voltage UZDWDuring not less than voltage error amplitude limit, for inciting somebody to action
(IZDW-Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine the photovoltaic electric not being blocked
The operating voltage U of pond componentW；Judging unit 803 is rejudged according to the reverse current I after assignmentZDWDefinite operating voltage UW
With the reverse current I after assignmentZDWCorresponding operating voltage UZDWDifference whether be less than voltage error amplitude limit.
In one embodiment, as shown in Figure 10, number determination unit includes：
Comparison module 1001, for comparing the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW
=(aN-n) IWWith maximum reverse current IfSize；
N values determining module 1002, for determining closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is anti-
The minimum number of anti-diode.
In one embodiment, as shown in figure 11, number determination unit includes：
Upper limit judgment module 1101, for judging the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith
UZDWProduct and the maximum power upper limit relation；
N values determining module 1102, determines the corresponding N values of product closest to the maximum power upper limit, which is counnter attack diode
Minimum number.
In one embodiment, counnter attack diode installing analysis device further includes：First setting unit, when N is 1, for inciting somebody to action
The counnter attack diode is located at the output loop of the photovoltaic combiner box.
In one embodiment, counnter attack diode installing analysis device further includes：Second setting unit when N is more than 1, is used for
Each counnter attack diode is located at the photovoltaic combiner boxA photovoltaic cell string formation branch road, makesA photovoltaic cell group
The string public counnter attack diode of branch.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It applies specific embodiment in the present invention to be set forth the principle of the present invention and embodiment, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
Thought according to the invention, there will be changes in specific embodiments and applications, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (16)
1. a kind of counnter attack diode installing analysis method of photovoltaic combiner box, which is characterized in that the photovoltaic combiner box includes：It is more
Bar cable, multiple fuses, a breaker, an arrester and an at least counnter attack diode；One end difference of m cable therein
Photovoltaic string formation anode is connected to by different electrode input end mouths, the other end is commonly connected to just by a positive output cable
Pole output port, the m cable are equipped with fuse；N other cable one end passes through different negative inputs respectively
Mouth is connected to photovoltaic string formation cathode, and the other end is commonly connected to cathode output end mouth by a negative output cable；The open circuit
Device is arranged on the positive output cable；The arrester be connected to the positive output cable and negative output cable it
Between；The counnter attack diode is arranged on the positive output cable or a wherein one shared counnter attack of the m cable
Diode；Wherein, the number of the counnter attack diode is 1, is arranged on the positive output cable；The counnter attack diode
Number is N, oftenBar cable shares one of counnter attack diode；
The described method includes：
According to the reverse current I for the photovoltaic cell component that U-I characteristic curves are blockedZDWAnd operating voltage UZDW；
According to the reverse current IZDWDetermine the operating voltage U for the photovoltaic cell component not being blockedW；
Judge the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error amplitude limit；
If so, determine the minimum number for reversing current through counnter attack diode when reverse current verifies.
2. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 1, which is characterized in that described
According to the reverse current I for the photovoltaic cell component that U-I characteristic curves are blockedZDWAnd operating voltage UZDW, including：
According to the initial reverse electric current I for the photovoltaic cell component that the calculating of U-I characteristic curves is blockedZDW0And initial operating voltage
UZDW0；
According to the number m of photovoltaic cell string formation, the number n for the photovoltaic cell string formation that is blocked and the initial reverse electric current IZDW0Meter
Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N are the number of counnter attack diode, and a is just
Integer；
Judge the initial operating voltage UW0With the initial operating voltage UZDW0Difference whether be less than voltage error amplitude limit；
If not, by (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain the reverse current IZDWAnd operating voltage
UZDW。
3. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 1, which is characterized in that described
According to the reverse current IZDWDetermine the operating voltage U for the photovoltaic cell component not being blockedW, including：
The operating voltage U for the photovoltaic cell component not being blocked is determined according to the U-I characteristic curvesW。
4. the counnter attack diode installing analysis method of photovoltaic combiner box according to any one of claim 1 to 3, feature
It is, if the operating voltage UWWith the operating voltage UZDWNot less than voltage error amplitude limit, further include：
By (IZDW-Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine what is be not blocked
The operating voltage U of photovoltaic cell componentW；
It rejudges according to the reverse current I after assignmentZDWDefinite operating voltage UWWith the reverse current I after assignmentZDWIt is corresponding
Operating voltage UZDWDifference whether be less than voltage error amplitude limit, loop iteration, until the difference be less than the voltage error limit
Width, the reverse current I of the stable state for the photovoltaic cell component being blockedZDWAnd operating voltage UZDW。
5. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 2, which is characterized in that determine institute
The minimum number of counnter attack diode when reversing current through reverse current verification is stated, including：
Compare the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW=(aN-n) IWWith maximum reverse electricity
Flow IfSize；
It determines closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is the minimum number of counnter attack diode.
6. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 2, which is characterized in that determine institute
The minimum number of counnter attack diode when reversing current through reverse current verification is stated, including：
Judge the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith UZDWProduct and the maximum power upper limit pass
System；
Determine the corresponding N values of product closest to the maximum power upper limit, which is the minimum number of counnter attack diode.
7. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 5 or 6, which is characterized in that also
Including：
If N is 1, the counnter attack diode is located to the output loop of the photovoltaic combiner box.
8. the counnter attack diode installing analysis method of photovoltaic combiner box according to claim 5 or 6, which is characterized in that also
Including：
If N is more than 1, each counnter attack diode is located at the photovoltaic combiner boxA photovoltaic cell string formation branch road, makesA public counnter attack diode of photovoltaic cell string formation branch.
9. the counnter attack diode installing analysis device of a kind of photovoltaic combiner box, which is characterized in that the photovoltaic combiner box includes：It is more
Bar cable, multiple fuses, a breaker, an arrester and an at least counnter attack diode；One end difference of m cable therein
Photovoltaic string formation anode is connected to by different electrode input end mouths, the other end is commonly connected to just by a positive output cable
Pole output port, the m cable are equipped with fuse；N other cable one end passes through different negative inputs respectively
Mouth is connected to photovoltaic string formation cathode, and the other end is commonly connected to cathode output end mouth by a negative output cable；The open circuit
Device is arranged on the positive output cable；The arrester be connected to the positive output cable and negative output cable it
Between；The counnter attack diode is arranged on the positive output cable or a wherein one shared counnter attack of the m cable
Diode；Wherein, the number of the counnter attack diode is 1, is arranged on the positive output cable；The counnter attack diode
Number is N, oftenBar cable shares one of counnter attack diode；
The counnter attack diode installing analysis device includes：
Reverse current generation unit, for the reverse current I for the photovoltaic cell component being blocked according to U-I characteristic curvesZDW
And operating voltage UZDW；
Operating voltage determination unit, for according to the reverse current IZDWDetermine the work for the photovoltaic cell component not being blocked
Voltage UW；
Judging unit judges the operating voltage UWWith the operating voltage UZDWDifference whether be less than voltage error amplitude limit；
Number determination unit, for determining the minimum for reversing current through counnter attack diode when reverse current verifies
Number.
10. the counnter attack diode installing analysis device of photovoltaic combiner box according to claim 9, which is characterized in that described
Reverse current generation unit includes：
Initial current computing module, for the initial reverse electricity for the photovoltaic cell component being blocked according to the calculating of U-I characteristic curves
Flow IZDW0And initial operating voltage UZDW0；
Voltage computing module, for number m, the number n for the photovoltaic cell string formation that is blocked according to photovoltaic cell string formation and described
Initial reverse electric current IZDW0Calculate the initial operating voltage U for the photovoltaic cell component not being blockedW0, wherein m=aN, N are counnter attack
The number of diode, a are positive integer；
Amplitude limit judgment module, for judging the initial operating voltage UW0With the initial operating voltage UZDW0Difference it is whether small
In voltage error amplitude limit；
Reverse current computing module, for by (IZDW0-Cs) it is assigned to the initial reverse electric current IZDW0, obtain the reversed electricity
Flow IZDWAnd operating voltage UZDW。
11. the counnter attack diode installing analysis device of photovoltaic combiner box according to claim 9, which is characterized in that described
Operating voltage determination unit is specifically used for：The work for the photovoltaic cell component not being blocked is determined according to the U-I characteristic curves
Voltage UW。
12. the counnter attack diode installing analysis device of the photovoltaic combiner box according to any one of claim 9-11, special
Sign is, further includes：
Assignment unit, as the operating voltage UWWith the operating voltage UZDWDuring not less than voltage error amplitude limit, for by (IZDW-
Cs) it is assigned to the reverse current IZDW, again according to the reverse current I after assignmentZDWDetermine the photovoltaic cell group not being blocked
The operating voltage U of partW；The judging unit is rejudged according to the reverse current I after assignmentZDWDefinite operating voltage UWWith tax
Reverse current I after valueZDWCorresponding operating voltage UZDWDifference whether be less than voltage error amplitude limit.
13. the counnter attack diode installing analysis device of photovoltaic combiner box according to claim 10, which is characterized in that described
Number determination unit includes：
Comparison module, for comparing the reverse current I of the stable state for the photovoltaic cell component being blockedZDW=(m-n) IW=(aN-n)
IWWith maximum reverse current IfSize；
N value determining modules, for determining closest to maximum reverse current IfIZDWIt is worth corresponding N values, which is counnter attack diode
Minimum number.
14. the counnter attack diode installing analysis device of photovoltaic combiner box according to claim 10, which is characterized in that described
Number determination unit includes：
Upper limit judgment module, for judging the reverse current I of the stable state for the photovoltaic cell component that will be blockedZDWWith UZDWProduct with
The relation of the maximum power upper limit；
N value determining modules, determine the corresponding N values of product closest to the maximum power upper limit, which is the minimum of counnter attack diode
Number.
15. the counnter attack diode installing analysis device of the photovoltaic combiner box according to claim 13 or 14, which is characterized in that
It further includes：First setting unit when N is 1, returns for the counnter attack diode to be located to the output of the photovoltaic combiner box
Road.
16. the counnter attack diode installing analysis device of the photovoltaic combiner box according to claim 13 or 14, which is characterized in that
It further includes：Second setting unit, when N is more than 1, for each counnter attack diode to be located at the photovoltaic combiner boxA light
It lies prostrate on battery string formation branch, makesA public counnter attack diode of photovoltaic cell string formation branch.
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|---|---|---|---|---|
| CN203117714U (en) * | 2013-03-18 | 2013-08-07 | 保定天威恒通电气有限公司 | Photovoltaic junction box control circuit |
| CN204465447U (en) * | 2015-02-11 | 2015-07-08 | 北京华电天仁电力控制技术有限公司 | A kind of header box for stand-alone PV power station |
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| JP5691891B2 (en) * | 2011-07-04 | 2015-04-01 | 日立金属株式会社 | Connection box for photovoltaic power generation |
| CN202178274U (en) * | 2011-07-20 | 2012-03-28 | 浙江尖山光电股份有限公司 | Intelligent photovoltaic array combiner box |
| US9105765B2 (en) * | 2012-12-18 | 2015-08-11 | Enphase Energy, Inc. | Smart junction box for a photovoltaic system |
| CN104065335B (en) * | 2014-06-04 | 2016-06-29 | 北京京东方能源科技有限公司 | photovoltaic confluence device |
| CN104052399B (en) * | 2014-06-20 | 2017-01-11 | 河海大学常州校区 | Method for estimating reliability of photovoltaic bypass diode |
| CN205104902U (en) * | 2015-11-27 | 2016-03-23 | 国网冀北电力有限公司电力科学研究院 | Photovoltaic confluence box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203117714U (en) * | 2013-03-18 | 2013-08-07 | 保定天威恒通电气有限公司 | Photovoltaic junction box control circuit |
| CN204465447U (en) * | 2015-02-11 | 2015-07-08 | 北京华电天仁电力控制技术有限公司 | A kind of header box for stand-alone PV power station |
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