CN105717974A - Maximum power point tracking device and method for photovoltaic cell - Google Patents
Maximum power point tracking device and method for photovoltaic cell Download PDFInfo
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- CN105717974A CN105717974A CN201610219038.7A CN201610219038A CN105717974A CN 105717974 A CN105717974 A CN 105717974A CN 201610219038 A CN201610219038 A CN 201610219038A CN 105717974 A CN105717974 A CN 105717974A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The embodiment of the invention provides a maximum power point tracking device and method for a photovoltaic cell. The tracking method comprises the following steps: sampling output current and output voltage of the photovoltaic cell, so as to obtain a current-voltage sampling set; computing an output power set of the photovoltaic cell according to the current-voltage sampling set, and determining first maximum power in the power set; calculating the average value of multiple powers close to the first maximum power, wherein the multiple powers close to the first maximum power do not include the first maximum power; computing conductivity increment and transient conductivity of the photovoltaic cell, according to the current-voltage sampling set, and regulating the load impedance of the photovoltaic cell according to the relation between the conductivity increment and the transient conductivity, so as to reach second maximum power of the photovoltaic cell; and calculating the average value of the average value of multiple powers close to the first maximum power and the second maximum power, so as to obtain a maximum power point. According to the device and the method, the maximum power point of the photovoltaic cell can be accurately tracked.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, in particular to the maximum of a kind of photovoltaic cell
Power points follows the tracks of device and method.
Background technology
From 18th century since the industrial revolution that Western European country starts, mankind's activity is to tradition energy
The extensive utilization in source has had resulted in serious environmental problem, has to look for new going out in energy problem
Road.Solar energy owing to having that reserves are big, recycling rate of waterused is high, the advantage such as easy to use and safety clean
Mentioned widely and researched and developed utilization.Then, the scientist of countries in the world gradually begins one's study solar energy
Photovoltaic power generation technology.
Due to intensity of illumination the most all in change, so cause the voltage of photovoltaic cell also can occur
Change, the I-U characteristic curve tool of photovoltaic cell is nonlinear, and photovoltaic cell I U characteristic is bent
The coordinate in length and breadth that on line, every bit is corresponding is multiplied, and can obtain photovoltaic power (P)-voltage (U)
Characteristic curve, when voltage constant is a fixed value, photovoltaic cell can Maximum Power Output.If environment
Parameter such as intensity of illumination, ambient temperature etc. change, and the I-U characteristic curve of photovoltaic cell can be sent out
Changing, P-U characteristic also can change, and the output valve of peak power also can be different.We are usual
By the best operating point of photovoltaic cell, referred to as maximum power point, by intensity of illumination and the impact of temperature,
Its size can be varied from.Production application needs make photovoltaic cell work at maximum power point.
How to make photovoltaic cell work at maximum power point, have become as photovoltaic research field instantly the most popular
Topic.
Summary of the invention
It is an object of the invention to provide a kind of maximum power point tracking device and the method for photovoltaic cell.
To achieve these goals, the technical scheme that the embodiment of the present invention uses is as follows:
First aspect, embodiments provides the MPPT maximum power point tracking dress of a kind of photovoltaic cell
Putting, the maximum power point tracking device of described photovoltaic cell includes: sampling module, for photovoltaic electric
The output electric current in pond and output voltage are sampled, and obtain current-voltage sampling set；First analyzes mould
Block, for according to described current-voltage sampling set, calculates the power collection of photovoltaic cell output, and really
The first peak power that fixed described power is concentrated；Second analyzes module, is used for asking for described first maximum
The meansigma methods of the multiple power near power, wherein, the multiple power near the first peak power do not wrap
Include the first peak power；3rd analyzes module, for according to described current-voltage sampling set, calculates
The conductance increment of photovoltaic cell and moment conductance, and according to described conductance increment and described moment conductance
Relation, adjusts the load impedance of photovoltaic cell so that photovoltaic cell reaches the second peak power；Maximum work
Rate point confirms module, for asking for the meansigma methods of described meansigma methods and described both second peak powers,
To obtain maximum power point.
Second aspect, the embodiment of the present invention additionally provides the MPPT maximum power point tracking side of a kind of photovoltaic cell
Method, the maximum power point tracing method of described photovoltaic cell includes: to the output electric current of photovoltaic cell and
Output voltage is sampled, and obtains current-voltage sampling set；According to described current-voltage sampling set,
Calculate the power collection of photovoltaic cell output, and determine the first peak power that described power is concentrated；Ask for
The meansigma methods of the multiple power near described first peak power, wherein, near the first peak power
Multiple power do not include the first peak power；According to described current-voltage sampling set, calculate photovoltaic electric
The conductance increment in pond and moment conductance, and according to described conductance increment and the relation of described moment conductance,
Adjust the load impedance of photovoltaic cell so that photovoltaic cell reaches the second peak power；Ask for described averagely
Value and the meansigma methods of described both second peak powers, to obtain maximum power point.
The maximum power point tracking device of a kind of photovoltaic cell that the embodiment of the present invention provides and method, logical
Cross the output electric current to photovoltaic cell and output voltage is sampled, and utilize multiple methods analyst, so
After various analysis is combined, finally determine the maximum power point of photovoltaic cell.Utilize this
The device and method of invention determines the maximum power point of photovoltaic cell, improves the maximum work of photovoltaic cell
The degree of accuracy of rate point so that what photovoltaic cell was stable is operated in maximum power point, improves photovoltaic cell
Work efficiency.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferable reality cited below particularly
Execute example, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required in embodiment
Accompanying drawing to be used is briefly described, it will be appreciated that the following drawings illustrate only some of the present invention
Embodiment, is therefore not construed as the restriction to scope, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings relevant attached
Figure.
Fig. 1 shows that the maximum power point tracking device of the photovoltaic cell that the embodiment of the present invention provides is fitted
Applied environment schematic diagram for service end；
Fig. 2 shows the maximum power point tracking device of the photovoltaic cell that the embodiment of the present invention provides
Block diagram；
Fig. 3 shows the maximum power point tracing method of the photovoltaic cell that the embodiment of the present invention provides
Flow chart；
Fig. 4 shows the power-voltage characteristic curve of photovoltaic cell；
Fig. 5 shows the current-voltage characteristic curve of photovoltaic cell；
Fig. 6 shows photovoltaic cell power-voltage characteristic curve under different illumination intensity.
Detailed description of the invention
Refer to Fig. 1, be that the maximum power point tracking device 110 of the present invention is applicable to service end 100
Applied environment schematic diagram.This service end 100 may be, but not limited to, the webserver, data
Storehouse server, cloud server etc..Described service end 100 includes maximum power point tracking device
110, memorizer 101, storage control 102 and processor 103.
Described memorizer 101, storage control 102 and processor 103, each element is the most straight
Connect or be indirectly electrically connected with, to realize the transmission of data or mutual.Such as, these elements mutually it
Between can realize being electrically connected with by one or more communication bus or holding wire.Described maximum power point with
It is described that track device 110 includes that at least one can be stored in the form of software or firmware (firmware)
In memorizer 101 or be solidificated in described service end 100 operating system (operating system,
OS) software function module in.Described processor 103 can for perform storage in memorizer 101
Perform module, such as, software function module that described maximum power point tracking device 110 includes or meter
Calculation machine program.
Wherein, memorizer 101 may be, but not limited to, read only memory Read Only Memory,
ROM), programmable read only memory (Programmable Read-Only Memory, PROM), can
Erasable read only memorizer (Erasable Programmable Read-Only Memory, EPROM),
Electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only
Memory, EEPROM), flash memory (FLASH) etc..Wherein, memorizer 101 is used for storing program,
Described processor 103, after receiving execution instruction, performs described program, the aforementioned embodiment of the present invention
The method performed by service end 100 flowing through Cheng Dingyi that any embodiment discloses can apply to place
In reason device 103, or realized by processor 103.
Processor 103 is probably a kind of IC chip, has the disposal ability of signal.Above-mentioned
Processor 103 can be general processor 103, including central processing unit
103 (Central Processing Unit is called for short CPU), network processing unit
103 (Network Processor is called for short NP) etc.；Can also is that digital signal processor
103 (DSP), special IC (ASIC), ready-made programmable gate array (FPGA) or other can compile
Journey logical device, discrete gate or transistor logic, discrete hardware components.Can realize or
Perform disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor 103
Can be microprocessor 103 or this processor 103 can also be the processor 103 of any routine
Deng.
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Generally herein described in accompanying drawing and the group of the embodiment of the present invention that illustrates
Part can be arranged with various different configurations and design.Therefore, below to the basis provided in the accompanying drawings
The detailed description of inventive embodiment is not intended to limit the scope of claimed invention, but only
Only represent the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not having
There is on the premise of making creative work the every other embodiment obtained, broadly fall into present invention protection
Scope.
It should also be noted that similar label and letter represent similar terms, therefore, one in following accompanying drawing
A certain Xiang Yi the accompanying drawing of denier is defined, then need not it is carried out further in accompanying drawing subsequently
Definition and explanation.Meanwhile, in describing the invention, term " first ", " second " etc. are only used
Describe in distinguishing, and it is not intended that indicate or hint relative importance.
Due to the environmental factors such as ambient temperature and intensity of illumination the most all in change, so cause light
The voltage of volt battery also can change.The I-U characteristic curve of photovoltaic cell is nonlinear, by light
The transverse and longitudinal coordinate that on volt battery I-U characteristic curve, every bit is corresponding is multiplied, and can obtain photovoltaic cell merit
Rate (P)-voltage (U) characteristic curve, as shown in Figure 4.
During from fig. 4, it can be seen that voltage constant is fixed value Umax1, photovoltaic cell can export
Peak power Pmax1.If ambient parameter (such as intensity of illumination, ambient temperature etc.) changes,
The I-U characteristic curve of photovoltaic cell can change, and P-U characteristic also can change, peak power
Output valve also can be different.We are generally by the best operating point of photovoltaic cell, referred to as maximum power point.
Maximum power point is affected by the environmental factors such as intensity of illumination and temperature, and its size can be varied from.Real
Needing in the production application of border to make photovoltaic cell work at maximum power point, this is accomplished by using peak power
Point tracking technique.
Maximum power point tracing method and the ultimate principle of device that the embodiment of the present invention provides are to pass through
Constantly detect output electric current and the voltage of photovoltaic cell, use control algolithm to estimate under present case
The peak power of system output, realizes peak power by the load impedance coupling that adjustment is current defeated
Go out.Thus because junction temperature raises, the output power from photovoltaic cells can be reduced at photovoltaic generating system
Time, still can ensure that whole system runs on optimal matching status under current working.
Fig. 5 shows that ambient temperature is constant, the I-U characteristic of photovoltaic cell under different illumination intensity
Curve chart.In figure, A, B represent maximum power point, and 2 suffered intensities of illumination of A, B are not
With.When working in the photovoltaic cell of A point by higher intensity of illumination, and now external loading is protected
Hold certain, then A point in operating point will run to a point.By Fig. 5 it can be seen that a point is not characteristic
Maximum power point on curve 2, operating point B is only the maximum power point on characteristic curve 2, wants
Operating point a is moved to operating point B, is necessary for that load 1 is become load 2 thus realizes maximum work
Rate point is followed the tracks of.
First embodiment
Refer to Fig. 2, it is shown that the MPPT maximum power point tracking of the photovoltaic cell that the embodiment of the present invention provides
The block diagram of device 110.The MPPT maximum power point tracking of the photovoltaic cell that the embodiment of the present invention provides
Device 110 includes: sampling module the 111, first analysis module the 112, second analysis module 113,
3rd analyzes module 114 and maximum power point confirmation module 115.
Sampling module 111, for the output electric current I and output voltage U of photovoltaic cell are sampled,
Obtain current-voltage sampling set.
Due to the environmental factors such as ambient temperature and intensity of illumination the most all in change, so cause light
The output electric current I and output voltage U of volt battery also can change.Time interval △ can be set
T (such as 0.05s), every a time interval △ t, the sampling module 111 output to photovoltaic cell
Electric current I and output voltage U samples, and obtains multiple electric current I-voltage U value, obtains electric current-electricity
Pressure sampling set.
First analyzes module 112, for according to described current-voltage sampling set, calculates photovoltaic cell
The power collection of output, and determine the first peak power Pmax1 that described power is concentrated.
Concrete, owing to described current-voltage sampling set includes the numerical value of multiple electric current I-voltage U
Right, for the numerical value pair of each electric current I-voltage U, utilize formula P=U*I to calculate right
The power answered, therefore, by the numerical value of each electric current I-voltage U to calculating, can obtain
The power collection of photovoltaic cell output.Refer to Fig. 4, its display power P and the characteristic curve of voltage U,
Wherein, each on characteristic curve point is corresponding power (such as P1, P2, P3, Pmax1, P4,
P5, P6, P7) it is based on the numerical value of the multiple electric current I-voltage U power to calculating, work as voltage
During for Umax1, the first peak power Pmax1 can be reached.
Second analyzes module 113, for asking for the multiple merits near described first peak power Pmax1
The meansigma methods of rateMultiple power near first peak power Pmax1 do not include the first maximum work
Rate Pmax1；
In the present embodiment, the first analysis module 112 the first peak power Pmax1 determined is not
Must be real peak power, but must be the value near real peak power, therefore, with
Centered by one analyzes the first peak power Pmax1 that module 112 is determined, extract the first peak power
Multiple power near Pmax1, it should be noted that the multiple power extracted necessarily are close to the
The power points of one peak power Pmax1, and do not include the first peak power Pmax1, such as Fig. 4
In power P 6 and P7 near the first peak power Pmax1.Then analyzed module 113 by second to count
Calculate the meansigma methods of the plurality of powerOwing to time interval △ t is the shortest, peak power Pmax1 is attached
Near power points is the most intensive, the meansigma methods calculated according to the power points extractedThe most accurate.Therefore,
△ t interval time in the present embodiment is the shortest more good, it is contemplated that calculate speed, in the present embodiment
△ t interval time can be 0.05s.Further, owing to eliminating the maximum that power is concentrated, because of
This, the power drawn in this way is closer to real peak power.
3rd analyzes module 114, for according to described current-voltage sampling set, calculates photovoltaic cell
Conductance incrementWith moment conductanceAnd according to described conductance incrementWith described moment conductance's
Relation, the load impedance adjusting photovoltaic cell makes photovoltaic cell reach the second peak power Pmax2.
In embodiments of the present invention, because the output electric current I of photovoltaic cell and output voltage U exists always
Change, thus its moment conductance is also variable, can be come by the relation of conductance increment and moment conductance
Adjust the load impedance of photovoltaic cell to adjust output voltage.
When conductance increment is equal to the negative value of moment conductance, i.e.
Time,
Photovoltaic cell is operated at maximum power point Pmax2；
IfTime,
Owing to the output voltage of photovoltaic cell is on the low side, by adjusting the load impedance of photovoltaic cell to increase
Output voltage values, so that it may so that photovoltaic cell is operated in the second peak power Pmax2；
IfTime,
The output voltage of photovoltaic cell is higher this moment, by adjusting the load impedance of photovoltaic cell to reduce
Its voltage output value, so that it may so that photovoltaic cell is operated in the second peak power Pmax2.
Rapidly, accuracy is high, and photovoltaic system can be made well to run in conductance increment method work.
But its system is computationally intensive, therefore, the processor 103 of service end 100 is required the highest, it is necessary to
Configuration high-speed arithmetic processor.
Maximum power point confirms module 115, is used for asking for described meansigma methodsMaximum with described second
The meansigma methods of power P max2, to obtain maximum power point.
In the present embodiment, due to meansigma methodsClose to real peak power, and second is maximum
Power P max2 is the peak power obtained by conductance increment method, therefore, the two is carried out average fortune
The result obtained after calculation is closest to real maximum power point, the i.e. embodiment of the present invention and follows the tracks of
The maximum power point arrived.
Second embodiment
Refer to Fig. 3, it is shown that the MPPT maximum power point tracking of the photovoltaic cell that the embodiment of the present invention provides
The flow chart of method.The maximum power point tracing method of the photovoltaic cell that the embodiment of the present invention provides includes
Following steps:
Step S1, samples to the output electric current I and output voltage U of photovoltaic cell, obtains electricity
Stream-voltage sample collection.
In the present embodiment, step S1 can be performed by sampling module 111.Due to ambient temperature and
The environmental factorss such as intensity of illumination the most all in change, so cause the output electric current I of photovoltaic cell
Also can change with output voltage U.A time interval △ t (such as 0.05s) can be set, often
Every a time interval △ t, the sampling module 111 output electric current I and output voltage U to photovoltaic cell
Sample, obtain multiple electric current I-voltage U value, obtain current-voltage sampling set.
Step S2, according to described current-voltage sampling set, calculates the power collection of photovoltaic cell output,
And determine the first peak power Pmax1 that described power is concentrated.
In the present embodiment, step S2 can be performed by the first analysis module 112.Concrete, by
The numerical value pair of multiple electric current I-voltage U is included, for each in described current-voltage sampling set
The numerical value pair of electric current I-voltage U, utilize formula P=U*I can calculate correspondence power, therefore,
By the numerical value of each electric current I-voltage U to calculating, the merit of photovoltaic cell output can be obtained
Rate collection.Refer to Fig. 4, its display power P and the characteristic curve of voltage U, wherein, characteristic curve
On power (such as P1, P2, P3, Pmax1, P4, P5, P6, P7) corresponding to each point
It is based on the numerical value of the multiple electric current I-voltage U power to calculating, when voltage is Umax1,
The first peak power Pmax1 can be reached.
Step S3, asks for the meansigma methods of multiple power near described first peak power Pmax1Wherein, the multiple power near the first peak power Pmax1 do not include the first peak power
Pmax1。
In the present embodiment, step S3 can be performed by the second analysis module 113.Analyzed by first
The first peak power Pmax1 that module 112 is determined is not necessarily real peak power, but necessarily
The value near real peak power, therefore, with first analyze that module 112 determines first
Centered by high-power Pmax1, extract the multiple power near the first peak power Pmax1, need
Bright, multiple power of extraction are necessarily close to the power points of the first peak power Pmax1, and
And do not include in the first peak power Pmax1, such as Fig. 4 the merit near the first peak power Pmax1
Rate P6 and P7.Then analyzed module 113 by second and calculate the meansigma methods of the plurality of powerBy
The shortest in time interval △ t, the power points near the first peak power Pmax1 is the most intensive, according to carrying
The meansigma methods that the power points taken calculatesThe most accurate.Therefore, △ interval time in the present embodiment
T is the shortest more good, it is contemplated that calculate speed, interval time, △ t can not be the least, therefore, and this
△ t interval time in embodiment can be 0.05s.Further, concentrate owing to eliminating power
Big value, therefore, the power drawn in this way is closer to real peak power.
Step S4, according to described current-voltage sampling set, calculates the conductance increment of photovoltaic cellWith
Moment conductanceAnd according to described conductance incrementWith described moment conductanceRelation, adjust photovoltaic
The load impedance of battery is so that photovoltaic cell reaches the second peak power Pmax2.
In embodiments of the present invention, because the output electric current I of photovoltaic cell and output voltage U exists always
Change, thus its moment conductance is also variable, can be come by the relation of conductance increment and moment conductance
Adjust the load impedance of photovoltaic cell to adjust output voltage.
When conductance increment is equal to the negative value of moment conductance, i.e.
Time,
Photovoltaic cell is operated at maximum power point Pmax2；
IfTime,
Owing to the output voltage of photovoltaic cell is on the low side, by adjusting the load impedance of photovoltaic cell to increase
Output voltage values, so that it may so that photovoltaic cell is operated in the second peak power Pmax2；
IfTime,
The output voltage of photovoltaic cell is higher this moment, by adjusting the load impedance of photovoltaic cell to reduce
Its voltage output value, so that it may so that photovoltaic cell is operated in the second peak power Pmax2.
Rapidly, accuracy is high, and photovoltaic system can be made well to run in conductance increment method work.
But its system is computationally intensive, therefore, the processor 103 of service end 100 is required the highest, it is necessary to
Configuration high-speed arithmetic processor.
Step S5, asks for described meansigma methodsWith putting down of described both second peak powers Pmax2
Average, to obtain maximum power point.
In the present embodiment, by maximum power point, step S5 can confirm that module 115 performs.Due to
Meansigma methodsClose to real peak power, the second peak power Pmax2 is to pass through conductance increment
The peak power that method obtains, therefore, the result obtained after the two is carried out mean operation is closest to
In the maximum power point that maximum power point, the i.e. embodiment of the present invention trace into.
Furthermore it is also possible under different illumination intensity, at interval of a special time △ t (such as 0.5s)
The output electric current I and output voltage U of photovoltaic cell is sampled, obtains under different illumination intensity
Multiple current-voltage sampling sets.Then, according to the multiple current-voltages sampling under different illumination intensity
Collection, calculates multiple power collection of photovoltaic cell output corresponding to multiple current-voltage sampling set, and really
Multiple 3rd peak powers Pmax3 that fixed the plurality of power collection is corresponding.Then, the multiple 3rd is removed
Maxima and minima in peak power Pmax3, and obtain remaining multiple 3rd peak power
A constant voltage corresponding to Pmax3.Owing to removing the maximum in multiple 3rd peak power Pmax3
Value and minima, improve the degree of accuracy of peak power.Refer to Fig. 6, it is shown that different illumination are strong
Degree (400W/m2、600W/m2、800W/m2、1200W/m2The P-U characteristic of the photovoltaic cell under) is bent
Line chart, the maximum power point under different illumination intensity always occurs from the left and right that voltage is 15V, therefore,
Even if intensity of illumination is different, maximum power point is also a corresponding constant voltage.Finally, constant according to this
The load impedance of Voltage Cortrol photovoltaic cell, makes the output voltage of photovoltaic cell be equal to this constant voltage,
So that photovoltaic cell reaches peak power.
It should be noted that in this article, the relational terms of such as first and second or the like is only used
By an entity or operation separate with another entity or operating space, and not necessarily require or
Imply relation or the order that there is any this reality between these entities or operation.And, term
" include ", " comprising " or its any other variant are intended to comprising of nonexcludability, thus
Make to include that the process of a series of key element, method, article or equipment not only include those key elements, and
And also include other key elements being not expressly set out, or also include for this process, method, thing
Product or the intrinsic key element of equipment.In the case of there is no more restriction, statement " include one
Individual ... " key element that limits, it is not excluded that include the process of described key element, method, article or
Equipment there is also other identical element.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for
For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention
Protection domain within.It should also be noted that similar label represents similar with letter in following accompanying drawing
, therefore, the most a certain Xiang Yi accompanying drawing is defined, then it is right to need not in accompanying drawing subsequently
It defines further and explains.
Claims (10)
1. the maximum power point tracking device of a photovoltaic cell, it is characterised in that described photovoltaic electric
The maximum power point tracking device in pond includes:
Sampling module, for sampling output electric current and the output voltage of photovoltaic cell, obtains electricity
Stream-voltage sample collection；
First analyzes module, for according to described current-voltage sampling set, calculates photovoltaic cell output
Power collection, and determine the first peak power that described power is concentrated；
Second analyzes module, for asking for the average of multiple power near described first peak power
Value, wherein, the multiple power near the first peak power do not include the first peak power；
3rd analyzes module, for according to described current-voltage sampling set, calculating the electricity of photovoltaic cell
Lead increment and moment conductance, and according to described conductance increment and the relation of described moment conductance, adjust light
The load impedance of volt battery is so that photovoltaic cell reaches the second peak power；
Maximum power point confirms module, is used for asking for described meansigma methods and described both second peak powers
Meansigma methods, to obtain maximum power point.
2. the maximum power point tracking device of photovoltaic cell as claimed in claim 1, its feature exists
In, described sampling module is additionally operable to: under different illumination intensity, at interval of a special time to photovoltaic
The output electric current of battery and output voltage are sampled, and the multiple electric currents under acquisition different illumination intensity-
Voltage sample collection.
3. the maximum power point tracking device of photovoltaic cell as claimed in claim 2, its feature exists
In, described first analyzes module is additionally operable to: according to the plurality of current-voltage sampling set, calculate institute
State multiple power collection of photovoltaic cell output corresponding to multiple current-voltage sampling set, and determine described
Multiple 3rd peak powers that multiple power collection are corresponding.
4. the maximum power point tracking device of photovoltaic cell as claimed in claim 3, its feature exists
In, described second analyze module is additionally operable to: the maximum removing in the plurality of 3rd peak power with
Minima, and obtain the constant voltage corresponding to remaining multiple 3rd peak power.
5. the maximum power point tracking device of photovoltaic cell as claimed in claim 4, its feature exists
In, the described 3rd analyzes module is additionally operable to: adjust the load resistance of photovoltaic cell according to described constant voltage
Anti-, make the output voltage of photovoltaic cell be equal to this constant voltage, so that photovoltaic cell reaches maximum rated
Power.
6. the maximum power point tracing method of a photovoltaic cell, it is characterised in that described photovoltaic electric
The maximum power point tracing method in pond includes:
Output electric current and output voltage to photovoltaic cell are sampled, and obtain current-voltage sampling set；
According to described current-voltage sampling set, calculate the power collection of photovoltaic cell output, and determine institute
State the first peak power that power is concentrated；
Ask for the meansigma methods of multiple power near described first peak power, wherein, the first maximum work
Multiple power near rate do not include the first peak power；
According to described current-voltage sampling set, calculate conductance increment and the moment conductance of photovoltaic cell,
And according to described conductance increment and the relation of described moment conductance, adjust the load impedance of photovoltaic cell with
Photovoltaic cell is made to reach the second peak power；
Ask for the meansigma methods of described meansigma methods and described both second peak powers, to obtain peak power
Point.
7. the maximum power point tracing method of photovoltaic cell as claimed in claim 6, its feature exists
In, described maximum power point tracing method also includes: under different illumination intensity, specific at interval of one
Output electric current and the output voltage of photovoltaic cell are sampled by the time, obtain under different illumination intensity
Multiple current-voltage sampling sets.
8. the maximum power point tracing method of photovoltaic cell as claimed in claim 7, its feature exists
In, described maximum power point tracing method also includes: according to the plurality of current-voltage sampling set,
Calculate multiple power collection of photovoltaic cell output corresponding to the plurality of current-voltage sampling set, and really
Multiple 3rd peak powers that fixed the plurality of power collection is corresponding.
9. the maximum power point tracing method of photovoltaic cell as claimed in claim 8, its feature exists
In, described maximum power point tracing method also includes: remove in the plurality of 3rd peak power
Big value and minima, and obtain the constant voltage corresponding to remaining multiple 3rd peak power.
10. the maximum power point tracing method of photovoltaic cell as claimed in claim 9, its feature exists
In, described maximum power point tracing method also includes: adjust photovoltaic cell according to described constant voltage
Load impedance, makes the output voltage of photovoltaic cell be equal to this constant voltage, so that photovoltaic cell reaches
High nominal powers.
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