CN104965559B - Brand-new photovoltaic grid-connected inverter multi-wave-crest MPPT working method - Google Patents
Brand-new photovoltaic grid-connected inverter multi-wave-crest MPPT working method Download PDFInfo
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- CN104965559B CN104965559B CN201510347477.1A CN201510347477A CN104965559B CN 104965559 B CN104965559 B CN 104965559B CN 201510347477 A CN201510347477 A CN 201510347477A CN 104965559 B CN104965559 B CN 104965559B
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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 brand-new photovoltaic grid-connected inverter multi-wave-crest MPPT working method. The brand-new photovoltaic grid-connected inverter multi-wave-crest MPPT working method includes determination of a working voltage meeting formula of a photovoltaic system, determination of a shadow judgment formula and shadow scanning and comprises the specific steps of firstly determining the working voltage meeting formula of the photovoltaic system, determining the shadow judgment formula according to the determined working voltage meeting formula of the photovoltaic system after the working voltage meeting formula of the photovoltaic system is determined, and performing shadow scanning after the judgment formula is determined. When a local shadow is produced, a local best working point is possibly located on the right side or the left side of the best working point in the last minute, but it is unknown whether a current working point is the best working point of the system or not at the moment, scanning is required to be performed again, other local best working points are found out and compared, and then the position of the highest one of the powers of the best working points found out in the comparison process is the best working point of the system.
Description
Technical field
The present invention relates to a kind of inverter many crests mppt algorithm, the many crests of specifically a kind of brand-new photovoltaic combining inverter
Mppt method of work, belonging to computer network, graph and image processing, computing power improvement, encrypting and decrypting, Chinese character input etc. should
Use technical field.
Background technology
Each photovoltaic generating system has a pu curve, this curve be parabolic function p=f (u) that is to say, that
Each voltage correspond to a unique performance number, as the control centre of photovoltaic system, one of photovoltaic combining inverter
Major function be exactly running voltage u controlling photovoltaic system in rational value umax, so that the output p of system is in
Big output point pmax.But in actual use because the reason such as shadow occlusion can make the pu curve of original system produce 2
Individual or even more grade of value point u1max, u2max...unmax, and in these grade of value point, only one of which is real maximum
Umax, remaining extreme point is only local maximum, and this phenomenon is to be determined by the self-characteristic of photovoltaic battery panel.Generally
In the case of, usually reduce the capacity of photovoltaic system, avoid producing the region of shade by reducing usable floor area, also have
Some producers reselect maximum power point using fixed cycle scanning method that is to say, that scanning whole system at set intervals
Pu curve, also just say that the running voltage of control system scans from the zero to maximum voltage, to judge the maximum of current operating point
It is the real maximum of system.
Now with the progressively popularization of domestic distributed photovoltaic system, in reality, some local shades unavoidably occur
Problem, such as fallen leaves, lamp stand, trees, parapet etc., so in order to more preferable when in the face of problems, can be loss
It is reduced to minimum it is necessary to there be a set of entirely different and calculation of mppt efficiency in the case of local shades can be greatly improved
Method, based on real application characteristic, be greatly improved judge present operating point maximum be system maximum software
Computational efficiency, photovoltaic system itself is in most cases not have shadow problem, if for the tracking under compatible shadow condition,
The system not having shadow occlusion will become zero from system maximum at set intervals by force, then spend a period of time again
Again from the zero to the process of maximum voltage, this can bring about extra power loss, causes normal system at set intervals
Will wasted power once, accumulation get up be a no small numeral.This situation why occurs it is simply that fixed cycle scans
Method has been not carried out shade and shadeless judgement, is merely only that the system within cycle certain time that achieves avoids being absorbed in
The problem of local maxima operating point.In addition, when shade occurs, shade is not unalterable, when shade becomes
When change, photovoltaic system is followed the trail of and is also intended to follow-up change, between photovoltaic system is possible in local shades and does not block completely
Changed, such as parapet in the east when, morning photovoltaic system occurs local shades problem, but to afternoon, photovoltaic
System will not blocked completely, so complete period scanning method can not carry out the conversion of this state, so cannot meet existing
The application of truth condition, after shade occurs, complete period scanning method equally has very big defect, and complete period scanning method is passive
, real-time cannot be accomplished, it can only realize action in certain time period after shade occurs, rather than horse back action, with
When, when it starts action, time-consuming, and whole sweep limitss cover from the zero to system maximum voltage, and sweep limitss are big, do not have
There is optimization, method comparison is simple, so the real-time either responding from the transformation of shadow condition, system or sweep limitss
Optimization aspect, original complete period scanning method all can not meet the application of reality, therefore, proposes a kind of for the problems referred to above
Brand-new photovoltaic combining inverter many crests mppt method of work.
Content of the invention
For above-mentioned prior art existing problems, the present invention provides a kind of brand-new photovoltaic combining inverter many crests mppt work
Make method, compared to existing technology, the optimum running voltage remembering upper one minute of initiative, by the change of optimum operating voltage
Change the Rule of judgment being used as photovoltaic system shadow condition, limited scanning scope, it is to avoid nonsensical system work, improve and ring
Answer speed and follow the trail of efficiency, can effectively solve the problems, such as in background technology.
For achieving the above object, the technical solution used in the present invention is: a kind of many crests of brand-new photovoltaic combining inverter
Mppt method of work, the running voltage including photovoltaic system meets the determination of formula, the determination of shade judgment formula and shade and sweeps
Retouch, its concrete mode is as follows:
(1), the running voltage of described photovoltaic system meets the determination of formula, and solar components have two in real world applications
Characteristic, one is exactly when intensity of illumination changes, and affects very little to the optimum operating voltage point of photovoltaic system, electric current is affected very
Greatly, when a certain block assembly intensity of illumination is especially low, triggering bypass diode work when just can lead to group string between voltage x current not
, the situation of many crests, another one is when high temperature changes in coupling, and the optimum operating voltage of photovoltaic system changes relatively
Big and meet formula below: vmppt=vmppt0* (1+0.64%* δ t)；Wherein vmppt is the best effort electricity of photovoltaic system
Pressure, t is ambient temperature；
(2), the determination of described shade judgment formula, in the case of there is no shadow occlusion, the characteristic of photovoltaic panel itself and group
String mode determines initial optimum operating voltage when starting working most, when in certain is a string, certain some assembly occurs seriously to block
Or this block when disappearance it may appear that running voltage situation about changing greatly, and shade and asks in any block assembly
During topic, the running voltage of upper one minute is memorized, as the Rule of judgment of next minute shadow condition, be dynamic and active
, determine that judgment formula is exactly: u2 ≠ u1* (1 ± 5%).Wherein u1 is the running voltage of upper one minute, and u2 is next minute
Running voltage；
(3) shaded scan, when local shades, local optimum operating point is possible to the optimal work at upper a minute
Make right side or the left side of point, but be now not aware that present operating point is system best operating point, needing to carry out
Scan and find out other local optimum operating points and compare.After this kind of situation occurs, with current voltage for one point upwards of initial point
Clock best effort spot scan, is scanned beyond one minute and continues to scan in the same direction, until finding from upper after best operating point
Till one minute nearest local optimum point of best operating point, the optimal work that found during being then compared this
Make point power, prominent place is exactly the best operating point of system.
Further, the described initiative optimum running voltage remembering upper one minute, by optimum operating voltage
Change is used as the Rule of judgment of photovoltaic system shadow condition.
Further, described shaded scan is scanned for compression zone.
Further, during the determination of described shade judgment formula, described photovoltaic panel is knowing the correlation of photovoltaic system
After parameter, directly can tentatively judge current system best operating point.
Further, during the determination of described shade judgment formula, after the normal operation of described photovoltaic system, one point in front and back
In clock, temperature can not possibly be mutated, and the change of intensity of illumination is little to the voltage influence of system best operating point.
Further, during the determination of described shade judgment formula, described photovoltaic system voltage is closed with illumination at that time
System is less, larger with the relation of temperature.
Further, within described any block assembly one minute, temperature change is temperature within 5 degree or a minute
Impact brings 3.3% optimum operating voltage to fluctuate at most.
Further, the judgement occurring of described shadow condition, define next minute ibid optimal work of a minute
Make voltage to occur during more than 5% change, to think that photovoltaic system occurs extremely, that is, to have the generation of shadow condition.
The invention has the beneficial effects as follows:
1st, pass through to innovate the mppt tracing algorithm under shadow condition, propose to have or not the judgment formula of shadow condition, realize not having
When having shadow condition to occur, system is run fully according to normal mode, greatly improves generated energy, realizes occurring when shadow condition
When, system quick response, timely action, larger raising dynamic tracing efficiency；
2nd, propose, when shadow condition occurs, how to optimize tracking range, look in realization time the fastest, minimum scope
To system best operating point, significantly evade nonsensical scanning process, the stability and generated energy of photovoltaic system has been had relatively
Big improvement, has good economic benefit and social benefit, is suitable for promoting the use of.
Brief description
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for description, the reality with the present invention
Apply example and be used for explaining the present invention together, be not construed as limiting the invention.
In the accompanying drawings:
Fig. 1 is scanning process flow chart of the present invention.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all
Belong to the scope of protection of the invention.
Embodiment:
A kind of brand-new photovoltaic combining inverter many crests mppt method of work, the running voltage including photovoltaic system meets public affairs
The determination of formula, the determination of shade judgment formula and shaded scan, its concrete mode is as follows:
Step one, the running voltage of described photovoltaic system meet the determination of formula, and solar components have in real world applications
Two characteristics, one is exactly when intensity of illumination changes, and affects very little to the optimum operating voltage point of photovoltaic system, to electric current shadow
Ring very big, when a certain block assembly intensity of illumination is especially low, during triggering bypass diode work, just can lead to voltage electricity between group string
Stream mismatches, and the situation of many crests, another one is when high temperature changes, and the optimum operating voltage of photovoltaic system becomes
Change larger and meet formula below: vmppt=vmppt0* (1+0.64%* δ t)；Wherein vmppt is the optimal work of photovoltaic system
Make voltage, t is ambient temperature；
Step 2, the determination of described shade judgment formula, in the case of there is no shadow occlusion, the characteristic of photovoltaic panel itself and
Group string mode determines initial optimum operating voltage when starting working most, and in certain is a string, certain some assembly occurs seriously to block
When or this block when disappearance it may appear that running voltage situation about changing greatly, and shade in any block assembly
During problem, the running voltage of upper one minute is memorized, as the Rule of judgment of next minute shadow condition, be dynamic and main
Dynamic, determine that judgment formula is exactly: u2 ≠ u1* (1 ± 5%).Wherein u1 is the running voltage of upper one minute, and u2 is next minute
Running voltage；
Step 3, shaded scan, when local shades, local optimum operating point is possible at upper one minute
The right side of good operating point or left side, but now it is not aware that present operating point is system best operating point, needing
It is scanned and finds out other local optimum operating points and compare.After this kind of situation occurs, with current voltage for initial point upwards
Best effort spot scan in one minute, is scanned beyond one minute and continues to scan in the same direction, until finding after best operating point
Till the upper one minute nearest local optimum point of best operating point, found during being then compared this
Good power of operating point, prominent place is exactly the best operating point of system.
The described initiative optimum running voltage remembering upper one minute, is used as by the change of optimum operating voltage
The Rule of judgment of photovoltaic system shadow condition；Described shaded scan is scanned for compression zone；Described shade judgment formula
In determination process, described photovoltaic panel, after knowing the relevant parameter of photovoltaic system, directly can tentatively judge that current system is optimal
Operating point；During the determination of described shade judgment formula, described photovoltaic system is normal run after, in front one minute after, temperature is not
May be mutated, and the change of intensity of illumination is little to the voltage influence of system best operating point；Described shade judgment formula
In determination process, described photovoltaic system voltage is with illumination relation at that time less, larger with the relation of temperature；Described any one piece
Within assembly one minute temperature change be temperature within 5 degree or a minute impact bring at most 3.3% best effort electricity
Pressure fluctuation；Described shadow condition occur occur judgement, define next minute ibid one minute optimum operating voltage occur
Think during more than 5% change that photovoltaic system occurs abnormal, that is, have the generation of shadow condition.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of the spirit or essential attributes of the present invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as limiting involved claim.
The above, only presently preferred embodiments of the present invention, not in order to limit the present invention, every skill according to the present invention
Any trickle amendment, equivalent and improvement that art is substantially made to above example, should be included in technical solution of the present invention
Protection domain within.
Claims (8)
1. a kind of brand-new photovoltaic combining inverter many crests mppt method of work, the running voltage including photovoltaic system meets formula
Determination, the determination of shade judgment formula and shaded scan it is characterised in that: its concrete mode is as follows:
(1), the running voltage of described photovoltaic system meets the determination of formula, and solar components have two spies in real world applications
Property, one is exactly when intensity of illumination changes, and the optimum operating voltage point of photovoltaic system is affected with very little, and electric current is affected very
Greatly, when a certain block assembly intensity of illumination is especially low, triggering bypass diode work when just can lead to group string between voltage x current not
, the situation of many crests, another one is when high temperature changes in coupling, and the optimum operating voltage of photovoltaic system changes relatively
Big and meet formula below: vmppt=vmppt0* (1+0.64%* δ t)；
Wherein vmppt is the optimum operating voltage of photovoltaic system, and t is ambient temperature；
(2), the determination of described shade judgment formula, in the case of there is no shadow occlusion, the characteristic of photovoltaic panel itself and group string side
Formula determines initial optimum operating voltage when starting working most, in certain is a string certain some assembly occur when seriously blocking or
This block when disappearance it may appear that running voltage situation about changing greatly, and when shadow problem in any block assembly,
The running voltage of upper one minute is memorized, as the Rule of judgment of next minute shadow condition, is dynamic and active, really
Determining judgment formula is exactly: u2 ≠ u1* (1 ± 5%)；
Wherein u1 is the running voltage of upper one minute, and u2 is the running voltage of next minute；
(3) shaded scan, when local shades, local optimum operating point is possible in upper one minute best operating point
Right side or left side, but be now not aware that present operating point be system best operating point, need be scanned
And find out other local optimum operating points and compare；After this kind of situation occurs, with current voltage, for initial point, one minute the most upwards
Good work spot scan, is scanned beyond one minute and continues to scan in the same direction after best operating point, until finding from upper one point
Till a nearest local optimum point of clock best operating point, the best operating point that found during being then compared this
Power, prominent place is exactly the best operating point of system.
2. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 it is characterised in that:
The initiative optimum running voltage remembering upper one minute, is used as photovoltaic system shade by the change of optimum operating voltage
The Rule of judgment of situation.
3. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 it is characterised in that:
Described shaded scan is scanned for compression zone.
4. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 it is characterised in that:
During the determination of described shade judgment formula, described photovoltaic panel, can directly just after knowing the relevant parameter of photovoltaic system
Step judges current system best operating point.
5. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 or 4, its feature exists
In: during the determination of described shade judgment formula, after the normal operation of described photovoltaic system, in front one minute after, temperature is impossible
Mutation, and the change of intensity of illumination is little to the voltage influence of system best operating point.
6. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 5 it is characterised in that:
During the determination of described shade judgment formula, described photovoltaic system voltage is little with illumination relation at that time, the pass with temperature
It is larger.
7. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 it is characterised in that:
Within described any block assembly one minute, temperature change is that the impact of temperature within 5 degree or a minute brings 3.3% at most
Optimum operating voltage fluctuation.
8. a kind of brand-new photovoltaic combining inverter many crests mppt method of work according to claim 1 or 7, its feature exists
In the judgement occurring of: described shadow condition, define next minute ibid the optimum operating voltage of a minute occur 5% with
Think during upper change that photovoltaic system occurs abnormal, that is, have the generation of shadow condition.
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| CN105630061B (en) * | 2016-01-19 | 2017-06-30 | 中国计量学院 | A kind of tandem photovoltaic component maximum power point tracing method |
| CN107340799B (en) * | 2017-08-29 | 2019-01-18 | 潍坊学院 | A kind of maximum power point of photovoltaic array tracking based on shadow Detection |
| CN114995578A (en) * | 2022-04-28 | 2022-09-02 | 武汉大学 | Tracking method for maximum power of photovoltaic array under local shadow |
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