CN107247475A - Suitable for the stagnant ring disturbance global maximum power point tracking method of band of photovoltaic optimizer - Google Patents
Suitable for the stagnant ring disturbance global maximum power point tracking method of band of photovoltaic optimizer Download PDFInfo
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- CN107247475A CN107247475A CN201710277911.2A CN201710277911A CN107247475A CN 107247475 A CN107247475 A CN 107247475A CN 201710277911 A CN201710277911 A CN 201710277911A CN 107247475 A CN107247475 A CN 107247475A
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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
Abstract
The invention discloses a kind of stagnant ring disturbance global maximum power point tracking method of band suitable for photovoltaic optimizer, including：S1：Controlling switch pipe is turned on, after entry condition is met, and with the disturbance global maximum power point tracking method operation of stagnant ring, otherwise continues the conducting of maintained switch pipe, until meeting entry condition；S2：Whole scan program is performed, it is continuous since specified initial value to change pulse duty factor, compare and draw global maximum power and its corresponding pulse duty factor；S3：Stagnant ring disturbance program is run by initial value of the corresponding pulse duty factor of maximum power value, changes dutycycle and finds partial power's extreme value；S4：Repeat step S3, step S2 is repeated at interval of preset time.The invention has the advantages that：Improve generating efficiency of the photovoltaic generating system in the case where local shades block operating mode, contribute to the smooth startup of photovoltaic generating system, it is to avoid traditional perturbation observation method judge by accident in generated output consecutive variations caused by inverter off-network.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, and in particular to a kind of stagnant ring disturbance of band suitable for photovoltaic optimizer is complete
Office's maximum power point tracing method.
Background technology
In the operation of actual photovoltaic generating system, photovoltaic array easily by the factor such as shadow occlusion influenceed, this illumination
Uneven situation can cause generated output significantly to decline, under egregious cases, and system output power is seriously reduced can band incoming call
Net stability problem, may cause fire damage to the photovoltaic element in photovoltaic array；Meanwhile, under local shades obstruction conditions,
Output power of photovoltaic module curve shows multi-peak feature, is that MPPT maximum power point tracking brings difficulty.
The content of the invention
It is contemplated that at least solving one of above-mentioned technical problem.
Therefore, it is an object of the invention to propose a kind of stagnant ring disturbance global maximum power of band suitable for photovoltaic optimizer
Point-tracking method, lifts the efficiency of acquisition system maximum power point.
To achieve these goals, embodiment of the invention discloses that a kind of stagnant ring disturbance of band suitable for photovoltaic optimizer
Global maximum power point tracking method, including photovoltaic module, photovoltaic optimizer, concentration inverter, the photovoltaic module pass through light
Volt optimizer is with concentrating inverter to be connected, and the photovoltaic optimizer includes power circuit and control circuit, and the power circuit is
Buck converters, the control circuit is used for the input voltage and input current for gathering the photovoltaic module, and according to the light
The input voltage and input current for lying prostrate component send pulse signal to the switching tube of the Buck converters, to pass through the pulse
Signal controls the conducting state of the switching tube, the described method comprises the following steps：S1：The control circuit controls the switch
Pipe is turned on, when meeting default entry condition, into step S2；S2：It is continuous since specified initial value to change pulse duty factor, than
Relatively draw global maximum power and its corresponding pulse duty factor；S3：It is initial using the corresponding pulse duty factor of maximum power value
Value starts, and changes dutycycle by gathering the corresponding power of dutycycle at hysteresis band, finds partial power's extreme value； S4：Weight
Multiple step S3, step S2 is repeated at interval of preset time.
Further, the dutycycle of the pulse signal continuously changed differs fixed step size successively from small to large.
Further, step S3 further comprises：
S301：Evaluation work point A power PA, operating point A dutycycle is the first dutycycle；
S302：A step-length, which is moved, to first direction reaches operating point B, operating point B power PB；
S303：Two step-lengths, which are moved, to second direction reaches operating point C, operating point C power PC, the first direction and
The second direction it is in opposite direction；
S304：Calculate Δ P1=PB-PA,ΔP2=PA-PCIf, Δ P1With Δ P2Symbol is identical and is positive sign, then operating voltage
Disturbed according to former direction；If symbol is all negative sign, operating voltage is disturbed to opposite direction；If symbol is different, work electricity
Pressure is constant.
The stagnant ring disturbance global maximum power point tracking method of band suitable for photovoltaic optimizer according to embodiments of the present invention,
Using the disturbance of stagnant ring by the way of whole scan is combined, can in the case where local shades such as block at the complex environment can with compared with
Fast speed tracing is to global maximum power point, and the entry condition that system is performed when starting judges to contribute to the smooth of photovoltaic system
Start.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the stagnant ring disturbance global maximum power point tracking method of the band suitable for photovoltaic optimizer of the embodiment of the present invention
Flow chart；
Fig. 2 is the circuit diagram of the photovoltaic optimizer of one embodiment of the invention；
Fig. 3 is the stagnant ring disturbance global maximum power point tracking of the band suitable for photovoltaic optimizer of one embodiment of the invention
The program execution flow figure of method；
Fig. 4 is the execution flow chart of the perturbation observation method subprogram of the stagnant ring effect of one embodiment of the invention；
Fig. 5 (a) is the schematic diagram of the perturbation observation method of the stagnant ring of band of one embodiment of the invention, and Fig. 5 (b) disturbs for tradition
Method and the schematic diagram with stagnant ring method of perturbation；
Fig. 6 is the execution flow chart of the whole scan subprogram of one embodiment of the invention；
Fig. 7 is the connection diagram of photovoltaic module in emulation of the invention；
Fig. 8 is Buck type photovoltaics optimizer topology in present invention emulation；
Fig. 9 (a) is that optimizer power output compares figure under two kinds of algorithms in situation one during the present invention emulates one, and Fig. 9 (b) is
Change in duty cycle oscillogram, situation in Fig. 9 (c) inventions emulation one in algorithm under two kinds of algorithms in situation one in present invention emulation one
Optimizer power output compares figure under two kinds of algorithms in two, and Fig. 9 (d) is to be calculated during the present invention emulates one in situation two under two kinds of algorithms
Change in duty cycle oscillogram in method；
Figure 10 (a) is that optimizer power output compares figure under two kinds of algorithms during the present invention emulates two, and Figure 10 (b) is the present invention
Change in duty cycle oscillogram in algorithm under two kinds of algorithms in emulation two；
Figure 11 is the light intensity change oscillogram in present invention emulation three；
Figure 12 is the photovoltaic module voltage power curve map in present invention emulation three；
Figure 13 (a) be the present invention emulation three in two kinds of algorithms under optimizer power output compare figure, Figure 13 (b) is this hair
Change in duty cycle oscillogram in algorithm under two kinds of algorithms in bright emulation three；
Figure 14 (a) is the connection diagram of photovoltaic module in present invention emulation four, and Figure 14 (b) is list in present invention emulation four
Photovoltaic member connection diagram in individual photovoltaic module；
Figure 15 is the output characteristics figure of single photovoltaic module in present invention emulation four；
Figure 16 is photovoltaic system gross output figure in present invention emulation four；
Figure 17 (a) is to be compared figure, Figure 17 (b) by two kinds of algorithm power outputs under the influence of shadow occlusion during the present invention emulates four
It is change in duty cycle oscillogram in algorithm under two kinds of algorithms in present invention emulation four.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicate or dark
Specific orientation must be had, with specific azimuth configuration and operation by showing the device or element of meaning, therefore it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying and be relative
Importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
With reference to following description and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.In these descriptions
In accompanying drawing, some particular implementations in embodiments of the invention are specifically disclosed, to represent the implementation for implementing the present invention
Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, the present invention
Embodiment includes all changes, modification and the equivalent fallen into the range of the spirit and intension of attached claims.
The present invention is described below in conjunction with accompanying drawing.
Fig. 1 is the stagnant ring disturbance global maximum power point tracking method of the band suitable for photovoltaic optimizer of the embodiment of the present invention
Flow chart, Fig. 2 is the circuit diagram of the photovoltaic optimizer of one embodiment of the invention.As depicted in figs. 1 and 2, one kind is applied to
The stagnant ring disturbance global maximum power point tracking method of the band of photovoltaic optimizer, including photovoltaic module PV, photovoltaic optimizer (including work(
Rate circuit and control circuit) and concentrate inverter (to load RL).Photovoltaic module PV passes through photovoltaic optimizer and load RLConnection.
Power circuit is Buck converters, and control circuit is used for the input voltage and input current for gathering photovoltaic module PV, and according to light
The input voltage and input current for lying prostrate component PV send pulse signal to the switching tube Q of Buck converters, to pass through pulse signal
Controlling switch pipe Q conducting state.Include suitable for the stagnant ring disturbance global maximum power point tracking method of band of photovoltaic optimizer
Following steps：
S1：The conducting of circuit controling switch pipe is controlled, when meeting default entry condition, into step S2；
S2：It is continuous since specified initial value to change pulse duty factor, compare and draw global maximum power and its corresponding arteries and veins
Rush dutycycle；
S3：Started using the corresponding pulse duty factor of maximum power value as initial value, by gathering the duty at hysteresis band
Change dutycycle than corresponding power, find partial power's extreme value；
S4：Repeat step S3, step S2 is repeated at interval of preset time.
Specifically, Fig. 3 is the stagnant global maximum work of ring disturbance of the band suitable for photovoltaic optimizer of one embodiment of the invention
The program execution flow figure of rate point-tracking method.As shown in figure 3, on optimizer (i.e. power circuit+control circuit) after electricity, program
Unloaded judgement is first carried out, if electric current, which is persistently more than, starts the threshold current specified time, starts to perform MPPT maximum power point tracking
Program；If being unsatisfactory for entry condition, it is 1 to set output duty cycle.TcntInitial value the overall situation be first carried out sweep for 0, i.e. program
Retouch subprogram.Whole scan is since specified dutycycle initial value, by under different duty under the sequential recording at fixed step size interval
Optimizer power, the power under a particular duty cycle is only recorded in major cycle each time.When optimizer voltage is less than threshold value
During voltage, then stop whole scan algorithm, before power points is moved at power maximum point.
Program structure is loop structure, TsamFor the timer variable of MPPT maximum power point tracking algorithm, TcntFor whole scan
The timer variable of subprogram, IsmpFor current sampling data, IlimProgram is disturbed to enter whole scan subprogram or entering stagnant ring
Starting current threshold value, UsmpFor voltage sample value, UlimTo enter the voltage threshold that stagnant ring disturbs program, D is dutycycle.Excellent
Change after device startup, every time into timer variable during major cycle from subtracting 1, until timer variable is kept to 0, timer variable is again
Initial value is loaded, respective code is performed.TsamWhen being kept to 0, start to perform with stagnant ring disturbance global maximum power point tracing algorithm,
TsamThe value of loading determines that sample frequency and stagnant ring disturb the frequency of subprogram；Similarly, TcntDetermine the sub- journey of whole scan
The frequency of sequence.Change Tsam、TcntValue be fine-tuning stagnant ring disturbance subprogram and whole scan subprogram matching relationship.
In practice, the matching relationship of stagnant ring disturbance subprogram and whole scan subprogram have impact on the operating efficiency of photovoltaic optimizer.
In one embodiment of the invention, the dutycycle of multiple pulse signals differs fixed step size successively from small to large.
Fig. 4 is the execution flow chart of the perturbation observation method subprogram of the stagnant ring effect of one embodiment of the invention.As shown in figure 4, at this
In one embodiment of invention, step S3 includes：
S301：Evaluation work point A power PA(PA=UA×IA), operating point A dutycycle is the first dutycycle；
S302：A step delta d, which is moved, to first direction reaches operating point B (DBFor operating point B dutycycle), operating point
B power PB(PB=UB×IB)；
S303：Two step-lengths, which are moved, to second direction reaches operating point C (DCFor operating point C dutycycle), operating point C
Power PC(PC=UC×IC), first direction and second direction it is in opposite direction；
S304：Δ P is calculated respectively1=PB-PA,ΔP2=PA-PCIf, Δ P1With Δ P2More than zero, then intermediate variable t increases
1, on the contrary subtract 1；T=2 is to represent Δ P1With Δ P2Symbol is identical and is positive sign, then operating voltage is disturbed according to former direction；If
T=-2 is to represent Δ P1With Δ P2Symbol is all negative sign, and operating voltage is disturbed to opposite direction；If symbol is different, t=0, work
Make voltage constant.
Fig. 5 (a) is the schematic diagram of the perturbation observation method of the stagnant ring of band of one embodiment of the invention.As shown in Fig. 5 (a), if
Present operating point is A ', and perturbation direction is voltage positive direction, then can be successively to B ', C ' work(according to the perturbation observation method of the present invention
Rate is sampled, it can be seen that Δ P1With Δ P2Symbol is identical and for positive sign, and the perturbation observation method with stagnant ring can maintain positive direction
Disturbance voltage is until searching out maximum power point A "；It can be drawn for the operative scenario for tracking power drop with analogy：Algorithm meeting
The disturbance voltage of negative direction is maintained until searching out maximum power point.The perturbation observation method of the stagnant ring of band of the present invention can be according to light
The peak power of volt component is exported.
Fig. 5 (b) is traditional method of perturbation and the schematic diagram with stagnant ring method of perturbation.As shown in Fig. 5 (b), for disturbing with stagnant ring
Next dynamic observation algorithm, if sampling A ", now environmental change, intensity of illumination reduction samples B ", C ", calculates Δ
P1With Δ P2Symbol contrary sign, algorithm will maintain present operating voltage.
For the traditional method of perturbation of contrast, if optimizer is operated on the left of maximum functional point, voltage is disturbed to voltage rise direction
Dynamic, environmental change when now sampling A ', intensity of illumination reduction, subsequent time samples B ', and algorithm judges voltage disturbance direction
Direction is reduced for voltage, the perturbation direction of traditional method of perturbation is away from maximum power point as seen from the figure.That is disturbance observation
Method is judged by accident, during irradiation level continuous decrease, is then likely to occur situation about continuously judging by accident.With traditional perturbation observation method phase
Compare, in the perturbation observation method with stagnant ring of the present invention, the power information that C points are gathered by increasing forms stagnant ring, carries out
Two-way disturbance with hysteresis characteristic, so as to inhibit the reforming phenomena of traditional perturbation observation method.It can be deduced by above-mentioned analysis
Go out：In the case of intensity of illumination continuous decrease, the perturbation observation method with stagnant ring is not in that traditional perturbation observation method connects
The situation of continuous erroneous judgement.
Fig. 6 is the execution flow chart of the whole scan subprogram of one embodiment of the invention.As shown in Fig. 3 Fig. 6, TcntIt is
Timing variable, during common count status, program runs stagnant ring Perturbed algorithms, TcntFrom subtracting, TcntEnd cycle is counted when=0, is entered
Enter whole scan program.When entering whole scan program every time, test initialization flag bit ScanInit is first determined whether, to the overall situation
The parameters such as surface sweeping starting dutycycle, the Pmax for recording peak power and the corresponding dutycycle Dmax of peak power are assigned just
Value, initialization flag position ScanInit terminate in whole scan rearmounted 1, for indicating that the parameter of next whole scan is initial
Change.The input power of optimizer is measured since being originated dutycycle, the power under initial duty cycle is regard as peak power Pmax
So as to comparison next time, similarly, starting dutycycle is Dmax.Enter dutycycle increase fixed step size after program every time, survey
The optimizer input power after dutycycle increase is measured, is compared with Pmax, if more powerful after change in duty cycle, records larger
Power and its corresponding dutycycle.The step-length used in whole scan is larger, excellent under different duty by comparing successively
Change the power output of device, the maximum power point in interval from starting dutycycle to the dutycycle upper limit may finally be obtained.Arrival is accounted for
Stop scanning when sky is than the upper limit 0.99, setting dutycycle is the corresponding value of maximum power point, and reload timing variable Tcnt, etc.
Treat to enter whole scan program next time.
The stagnant ring disturbance global maximum power point tracking method of the band suitable for photovoltaic optimizer of the embodiment of the present invention has
Following features：
1st, dutycycle is output as 1 when optimizer is unloaded, and optimizer is in holding state：At this moment program instantaneous acquiring is passed through excellent
Change the electric current of device, it is excellent with reference to starting in the way of low-voltage judges with whole scan when electric current persistently exceeds no-load current threshold value
Change device；Terminate after Light Condition, whole scan program is first carried out, photovoltaic is progressively detected by the dutycycle for being superimposed fixed step size
Component input voltage, it is to avoid optimizer is restarted due to input voltage less than system operating voltage.Current Voltage during startup
Compound Rule of judgment, help to concentrate grid-connected inverters so that being able to of photovoltaic system smoothly starts.Meanwhile, it is first carried out
Whole scan algorithm can ensure photovoltaic system under the conditions of shadow occlusion can with faster speed find peak power
Point carries out electric energy output；
If the 2, system has passed through unloaded judgement, low-voltage judgement, system enters the following method of operation：Normal running conditions
Under, run according to stagnant ring perturbation scheme, program timing performs whole scan algorithm.Traditional disturbance observation mentioned hereinabove
Method, the perturbation observation method with stagnant ring, whole scan method.It can be seen that three kinds of algorithms are not quite similar, it is global maximum with the disturbance of stagnant ring
Power points tracing overcomes the problem of traditional perturbation observation method is continuously judged by accident, has the disadvantage only trace into partial power
Maximum point, and the method for whole scan can realize the tracking of global maximum power point, but can cause larger in scanning process
Power loss.
The characteristic of the present invention is the advantage for taking composite algorism, and suitable whole scan opportunity can be work at present
Point can also make one during being moved to global power maximum point, whole scan to photovoltaic module fan-out capability and simply comment
Estimate, to prevent optimizer input voltage deficiency from causing optimizer to restart, optimizer is in normal operation during program major part
Between performing stagnant ring disturbance program, so avoid the power loss that whole scan algorithm is brought.
Below by by the stagnant ring of the band suitable for photovoltaic optimizer of the embodiment of the present invention disturb global maximum power point with
Track method is emulated, to further illustrate the stagnant ring disturbance global maximum power point track side of the band of photovoltaic optimizer of the present invention
The beneficial effect of method.
Fig. 7 is the connection diagram of photovoltaic module in emulation of the invention.As shown in fig. 7, Simulation Experimental Platform is PSIM,
String is organized in units of three photovoltaic module series connection in emulation experiment, emulation is using two groups of series-parallel forms of group, each photovoltaic
The equal inverse parallel of component outlet side has diode.
Fig. 8 is Buck type photovoltaics optimizer topology in present invention emulation.As shown in figure 8, the topology used in emulation is
BUCK type DC-DC converters, C modules are an emulation elements in PSIM, and corresponding calculation can be realized by C language programming
Method logic.
Emulation one：Idle condition correlation emulation
The emulation under idle condition is carried out by taking three photovoltaic module series connection with photovoltaic optimizer as an example.The first situation
Started with idle condition, load-side is closed a floodgate during 1.5s, simulates this operating mode when photovoltaic system normally starts；At the beginning of second case
Beginning state is normal operating conditions, and in 1.5s, load-side is tripped, and load-side is closed a floodgate again during 2s, when simulating load-side fault
Tripping operation and the situation of reclosing.
Fig. 9 (a) is that optimizer power output compares figure under two kinds of algorithms in situation one during the present invention emulates one, and Fig. 9 (b) is
Change in duty cycle oscillogram, situation in Fig. 9 (c) inventions emulation one in algorithm under two kinds of algorithms in situation one in present invention emulation one
Optimizer power output compares figure under two kinds of algorithms in two, and Fig. 9 (d) is to be calculated during the present invention emulates one in situation two under two kinds of algorithms
Change in duty cycle oscillogram in method.As seen from Figure 9, system input power is close to zero during zero load, and common disturbance is calculated
Dutycycle perturbation direction is uncertain in method, and dutycycle is to fluctuate in situation one, and dutycycle persistently rises in situation two；
Keep dutycycle to be 1 during zero load with stagnant ring disturbance global maximum power point tracing, so that ensure during system reclosing can be with
The very first time detects the curent change on dc bus, it is ensured that system can be recovered to normal shape with a faster speed
State.
Emulation two：Startup emulation under low power condition
It is similar with emulation one, carried out by taking three photovoltaic module series connection with photovoltaic optimizer as an example under low-power operating mode
Emulation, intensity of illumination suffered by photovoltaic module is 600W/m2；Assuming that the minimum operating voltage of optimizer is 12V, when optimizer works electric
Force down when 12V, optimizer restarting, i.e., each variable reverts to initial value value in algorithm；Initially accounted in common stagnant ring algorithm
Empty ratio is set to 0.8.
Figure 10 (a) is that optimizer power output compares figure under two kinds of algorithms during the present invention emulates two, and Figure 10 (b) is the present invention
Change in duty cycle oscillogram in algorithm under two kinds of algorithms in emulation two.It can be drawn by Figure 10, global maximum work is disturbed with stagnant ring
Dutycycle to height from scanning in start-up course for rate point tracing, and when input voltage is less than 12V, program exits whole scan
Program, is exported with the maximum power point scanned before.Again it can be seen that can guarantee that optimizer can be with normal work
Dutycycle is less than 0.8, and initial duty cycle is set to 0.8 in common stagnant ring algorithm, and at this moment optimizer input voltage will be less than
12V, optimizer will restart repeatedly, situation shown in Figure 10 occur.Optimizer power output can be received in this case
Limitation.
Emulation three：Global maximum power point tracing, which is disturbed, with stagnant ring continuously declines the emulation under situation in illumination
Figure 11 is that light intensity change oscillogram, Figure 12 in present invention emulation three is photovoltaic module electricity in present invention emulation three
Press power.It is similar with emulation one, carry out low-power work by taking three photovoltaic module series connection with photovoltaic optimizer as an example
Emulation under condition, intensity of illumination unification and variety suffered by photovoltaic module, change waveform is as shown in figure 11.At the 0.8s moment, illumination is strong
Degree per second declines 400W/m2, stop declining to 1.8s moment intensity of illumination.Figure 12 provides photovoltaic module power-voltage curve, says
Maximum power point is moved to the direction that voltage reduces during bright intensity of illumination declines.
Figure 13 (a) be the present invention emulation three in two kinds of algorithms under optimizer power output compare figure, Figure 13 (b) is this hair
Change in duty cycle oscillogram in algorithm under two kinds of algorithms in bright emulation three.As seen from Figure 13 in illumination continuous decrease process
In, common Perturbed algorithms remain that dutycycle is constant, illustrate that dutycycle perturbation direction is not moved to maximum power point direction,
After drop process terminates under light illumination, duty Bizet changes therewith, and this process reflects common method of perturbation and there is erroneous judgement now
As.Relatively with common perturbation observation method, global maximum power point tracing is disturbed during illumination continuous decrease with stagnant ring
Dutycycle moving direction toward peak power move, in this process, it can be seen that with stagnant ring disturb global maximum power point with
Track method overcomes the misjudgment phenomenon of traditional perturbation observation method, and with higher efficiency in whole process.
Emulation four：The emulation that global maximum power point tracing tracks power under the conditions of multi-peak is disturbed with stagnant ring
Figure 14 (a) is the connection diagram of photovoltaic module in present invention emulation four, and Figure 14 (b) is list in present invention emulation four
Photovoltaic member connection diagram in individual photovoltaic module.It is similar with emulation one, connected with three photovoltaic modulies with photovoltaic optimizer
Exemplified by carry out low-power operating mode under emulation.The connected mode of photovoltaic member in a photovoltaic module, i.e., 12 are given in Figure 14 (b)
Individual photovoltaic member series connection is in parallel with a diode reverse, is formed in a photovoltaic module by three such structures in series.Currently
When stating three structure light differences, the output characteristics of photovoltaic module is in multi-peak characteristic.Only one of which photovoltaic is assumed in simulations
Component is by shadow occlusion, and foregoing three structures difference light is 1000W/m2、800W/m2、600W/m2.In order that result has more
It is illustrative, emulate by the way of No Load Start, i.e. load-side is closed a floodgate during 0.6s.
Figure 15 is the output characteristics figure of single photovoltaic module in present invention emulation four, and Figure 16 is photovoltaic in present invention emulation four
System gross output figure.The output characteristics of single photovoltaic module is as shown in figure 15.Use and disturbed with stagnant ring as seen from Figure 16
The photovoltaic system power output of dynamic global maximum power point tracing is higher.
Figure 17 (a) is to be compared figure, Figure 17 (b) by two kinds of algorithm power outputs under the influence of shadow occlusion during the present invention emulates four
It is change in duty cycle oscillogram in algorithm under two kinds of algorithms in present invention emulation four.The optimizer by shadow occlusion is individually analyzed,
Its power out-put characteristic and change in duty cycle oscillogram as shown in figure 17, in Figure 17 (a) it can be seen that common Perturbed algorithms with
Track power is partial power's maximum point, and system photovoltaic system upon actuation is ensure that with stagnant ring disturbance global maximum power point tracing
System is just exported with global maximum power point.This point difference causes with stagnant ring disturbance global maximum power point tracing multiple
General labourer's condition has more excellent output.
In addition, the stagnant ring disturbance global maximum power point tracking method of the band suitable for photovoltaic optimizer of the embodiment of the present invention
Other compositions and effect be all known for a person skilled in the art, in order to reduce redundancy, do not repeat.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is by claim and its equivalent limits.
Claims (3)
1. a kind of stagnant ring disturbance global maximum power point tracking method of band suitable for photovoltaic optimizer, it is characterised in that including
Photovoltaic module, photovoltaic optimizer, concentration inverter, the photovoltaic module are connected by photovoltaic optimizer with concentration inverter, institute
Stating photovoltaic optimizer includes power circuit and control circuit, and the power circuit is Buck converters, and the control circuit is used for
The input voltage and input current of the photovoltaic module are gathered, and is pressed according to the input voltage and input current of the photovoltaic module
Pulse signal is sent to the switching tube of the Buck converters according to methods described, to control the switch by the pulse signal
The conducting state of pipe, the described method comprises the following steps：
S1：The control circuit controls the switching tube conducting, when meeting default entry condition, into step S2；
S2：It is continuous since specified initial value to change pulse duty factor, compare and show that global maximum power and its corresponding pulse are accounted for
Sky ratio；
S3：Started using the corresponding pulse duty factor of maximum power value as initial value, by gathering the dutycycle pair at hysteresis band
The power answered changes dutycycle, finds partial power's extreme value；
S4：Repeat step S3, step S2 is repeated at interval of preset time.
2. the stagnant ring disturbance global maximum power point tracking method of the band according to claim 1 suitable for photovoltaic optimizer,
Characterized in that, the dutycycle of the pulse signal continuously changed differs fixed step size successively from small to large.
3. the stagnant ring disturbance global maximum power point tracking method of the band according to claim 2 suitable for photovoltaic optimizer,
Characterized in that, step S3 further comprises：
S301：Evaluation work point A power PA, operating point A dutycycle is the first dutycycle；
S302：A step-length, which is moved, to first direction reaches operating point B, operating point B power PB；
S303：Two step-lengths, which are moved, to second direction reaches operating point C, operating point C power PC, the first direction and described
Second direction it is in opposite direction；
S304：Calculate Δ P1=PB-PA,ΔP2=PA-PCIf, Δ P1With Δ P2Symbol is identical and for positive sign, then operating voltage according to
Former direction is disturbed；If symbol is all negative sign, operating voltage is disturbed to opposite direction；If symbol is different, operating voltage is not
Become.
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