CN104300578B - Software achieving method for eliminating false starting and stopping of grid connection photovoltaic inverter - Google Patents
Software achieving method for eliminating false starting and stopping of grid connection photovoltaic inverter Download PDFInfo
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- CN104300578B CN104300578B CN201410542274.3A CN201410542274A CN104300578B CN 104300578 B CN104300578 B CN 104300578B CN 201410542274 A CN201410542274 A CN 201410542274A CN 104300578 B CN104300578 B CN 104300578B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008030 elimination Effects 0.000 claims description 6
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 230000006870 function Effects 0.000 description 6
- 210000003850 cellular structure Anatomy 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H02J3/383—
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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 software achieving method for eliminating false starting and stopping of a grid connection photovoltaic inverter. The grid connection photovoltaic inverter needs to achieve automatic starting and stopping with unattended operation, and because the relation between voltage and power of a photovoltaic battery assembly is unstable at sunrise and sunset moments, repeated starting and stopping happen sometimes. Due to repeated starting and stopping, a grid connection contactor is opened and closed, and after a long time, the service life of the grid connection contactor can be greatly shortened. According to the software achieving method, a series of measures are combined without additionally arranging any device, and through starting time delay, time factors added for normal starting and stopping at the sunrise and sunset moments and cooperation with MPPT, the false starting and stopping at the sunrise and sunset moments can be completely eliminated.
Description
Technical field
The present invention relates to power electronics and photovoltaic inversion device control field, inverse particularly to a kind of elimination grid-connected photovoltaic
Become the software implementation method that device misses start and stop phenomenon.
Background technology
Growing tension with the energy and user requirement more and more higher to power supply reliability, distributed power generation is in power train
Play increasing effect in system, photovoltaic (photovoltaic, pv) electricity generation system be in distributed power generation very
One of important generation mode.Electric energy is served electrical network, referred to as grid-connected system by solar power system.
Photovoltaic combining inverter will be realized unmanned and automatically open machine and shutdown.At sunrise, when sunlight reach necessarily strong
Degree, inverter need to open machine automatically, and the Rule of judgment in general opening machine is all the DC voltage value of photovoltaic cell component.And due to
The characteristic curve of photovoltaic cell component, it is too high that this voltage can not take, and if taking general empirical value, the generating work(of Qi Jihou
Rate is again very little, is not suitable for generating electricity by way of merging two or more grid systems, and therefore can shut down again, sometimes even can be repeated several times by this process.At sunset, work as power
Low to a certain extent, that is, can autostop, and battery component voltage when after sometimes shutting down be not less than and open machine voltage threshold, because
This can open machine again.In a word, the automatic start-stop machine of combining inverter is likely to misoperation several times, and each action all can cause simultaneously
Net contactor carries out separating brake and combined floodgate, therefore accumulates the life-span that can greatly shorten grid-connected contactor.
The main flow way solving this problem at present has two kinds, and one kind is to increase false load device, i.e. preposition power detection
Circuit, when power reaches to a certain degree, inverter just starts.Second is to increase clock chip, according to grid-connected photovoltaic inverter
On-site longitude and latitude extrapolates the time of sunrise sunset, further according to time start and stop photovoltaic DC-to-AC converter.
Content of the invention
The present invention proposes a kind of method only needing to and just eliminating grid-connected photovoltaic inverter mistake start and stop phenomenon using software,
The method its be applied to various single-chip microcomputers for photovoltaic DC-to-AC converter, dsp control chip etc. it is not necessary to increase hardware, therefore not
Extra cost can be increased.
A) condition that setting grid-connected photovoltaic inverter starts and shuts down；
The method that b) time threshold is set；
C) method of mppt algorithm adjustment, mppt is MPPT maximum power point tracking.
Further, the entry condition in step a) is: when battery component voltage is higher than threshold voltage, starts grid-connected inverse
Become device；Halt condition is: is less than threshold power value when running power, combining inverter is shut down.
Further, time delay is set、, after grid-connected photovoltaic inverter reaches entry condition, pass throughAfter restart simultaneously
Net inverter, after combining inverter starts, judges " sunset shutdown flag bit " whether set, if it is,In time no longer
Orderly closedown；
Setting time delay, after grid-connected photovoltaic inverter reaches halt condition,No longer machine is opened in time, and by " sunset
Shutdown flag bit " set, described flag bit is used as the mark that machine is opened in sunrise；
、、For time parameter.
Further, the method for adjustment of described mppt algorithm is: grid-connected photovoltaic inverter is in operation using mppt function
Searching for prominent DC voltage value always；Under low power scenarios, battery power curve change, maximum power point straight
Stream voltage constantly reduces, and mppt search precision also declines therewith, and search voltage may be too low, meeting false triggering orderly closedown, therefore
Under low power scenarios, grid-connected photovoltaic inverter does not restart mppt function, runs using constant voltage mode is fixing.
Further, the power setting of described constant voltage mode is the 4% of grid-connected photovoltaic inverter rated power.
The technique effect of the present invention is as follows:
Grid-connected photovoltaic inverter, in photovoltaic plant unattended operation, can be automatically performed sunrise and open machine and sunset shutdown
Function, and open machine and shutting down and once complete, be not in the phenomenon that by mistake start and stop are repeated several times, thus decrease grid-connected contactor moving
The number of times made, extends its life-span；And this invention does not need to increase extra device, has saved cost.
Brief description
Machine flow chart is opened in the sunrise of Fig. 1 present invention.
Flow chart is shut down in the sunset of Fig. 2 present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the implementation of the present invention is described further.Corresponding to different control chips, adopt
Realized with different program languages.This practical example uses the dsp28335 control chip of ti, the method is pressed following
Flow chart and ins and outs description, realize with c Programming with Pascal Language, will be soft for the control writing the embedded photovoltaic DC-to-AC converter of the program completing
Among part.
Fig. 1 is that machine flow chart is opened in the sunrise of the present invention, first determines whether whether battery component voltage reaches and opens dynamo-electric pressure, reaches
Open time delay after dynamo-electric pressure, just formally start combining inverter afterwards.Then, after being incorporated into the power networks, judge whether it is that " sunrise is opened
Machine ", if " machine is opened in sunrise ", arranges time delayNo longer " orderly closedown ", if " disorderly closedown " or " manual shut-down "
Situation, will not come into force, thus without impact inverter normal operation.
Fig. 2 is that flow chart is shut down in the sunset of the present invention.First determine whether to run whether power is less than threshold valueIf, full
Foot, then be judged as " sunset shutdown ", and inverter is shut down, time delayNo longer open machine, put " sunset shutdown flag bit " simultaneously, this mark
Will position is used as the mark that machine is opened in sunrise.
The adjustment of mppt function: under low power scenarios, when being less thanWhen, stop mppt function, specify simultaneouslyFor
Run DC voltage.
Above-mentioned flow process details is described further: photovoltaic DC-to-AC converter control software should possess " disorderly closedown ", " stop manually
Machine " and " orderly closedown " three kinds of halt modes." orderly closedown " is the sent out power of inverter less than shutdown power threshold
Triggering halt mode, because only that at sunset just can this thing happens, therefore can be realized by this halt mode
The autostop of photovoltaic DC-to-AC converter at sunset.
Set with the sun, irradiation level gradually reduces, the sent out power of inverter is less thanAfterwards, switch to mppt and determine voltage-mode
Formula it is intended thatFor running DC voltage.Reduce further with irradiation level, when the sent out power of inverter gradually reduces, when low
InAfterwards, trigger " orderly closedown ", be " sunset shutdown " by described above may determine that, and " sunset shutdown flag bit " is put
Position, hereafter inverter is in stopped status, time delayNo longer open machine.Arrange this time delay to be because after a shutdown although photovoltaic electric
Pond assembly does not have power substantially, but now voltage is still likely to be greater than and opens dynamo-electric pressure, without this time delay, then exist
Just probably open machine immediately after shutdown, and because power is too low, once more shut down, this process is possible to repeat 2,3
About secondary, cause the error starting phenomenon of photovoltaic DC-to-AC converter.
After " sunset shutdown ", now sunlight irradiation level is very low, is substantially dusk, therefore at second day before sunrise, light
Volt inverter is all without opening machine once again.In other words, if the first time photovoltaic DC-to-AC converter after " sunset shutdown " opens machine, then must
It is so " machine is opened in sunrise ".Therefore " sunset shutdown flag bit " can be used as the judgement symbol whether being " machine is opened in sunrise ".
When morning sunrise, open gate limit value when the voltage of photovoltaic cell component reaches, time delay, now inverter
Open machine, judge " sunset shutdown flag bit " whether set simultaneously, if set, may determine that this time opening machine is that " sunrise is opened
Machine ".After opening machine, power now is very little to cause the mistakenly stop machine phenomenon of inverter it is more likely that " orderly closedown " can be triggered,
Therefore in " machine is opened in sunrise " time delay afterwards, forbid " orderly closedown " during this period, " emergency shutdown " and " manual shut-down " still has
Effect, therefore break down during this period be also can " disorderly closedown ", photovoltaic DC-to-AC converter other functions are not affected.If
Meter time delayIt is to cause the extreme feelings of control panel power-off to prevent from leading to ups electricity to exhaust too long if there is electrical breakdown
Condition, after this extreme case occurs, control panel power down, " sunset shutdown flag bit " will be eliminated, therefore can not after opening machine
Time delay againIt is possible to start and stop phenomenon by mistake can occur.Add this time delayAfterwards, the impact of this kind of situation can be reduced.
For different longitudes and latitudes, different assemblies and different demands, the parameters in the method can root
According to situation adjustment, without departing from following design principles.The setting principle of parameter in the method is done further below
Explanation.
Switch mppt to the power of constant voltage mode: could be arranged to the 4% of photovoltaic DC-to-AC converter rated power, in this work(
Under rate, it is very little not start the power loss that mppt brought, and is negligible.Do not start mppt and adopt and determine voltage-mode
Formula, it is ensured that operation stability, prevents power too low false triggering orderly closedown.
Open machine time delayCould be arranged to 2 minutes, this mainly rises situation by the local sunrise irradiation level of photovoltaic power plant
To determine, design principle is if extreme case leads to control panel power down, opens machine time delayPower output afterwards as far as possible close to or
Exceed " orderly closedown " powerSo that the mistake start-stop time producing is less than 1 time.
Open dynamo-electric pressureDepend primarily on the needs of application, open dynamo-electric pressure and open acc power proportional it is desirable to open machine
Power is slightly larger, just arranges largerIt is desirable to it is less to open acc power, just arrange less.
" orderly closedown " powerAlso the needs of application are depended primarily on,With shut down power proportional it is desirable to inverse
Become device run time longer, that is, when shutting down, power is relatively low, then arrange relatively lowOtherwise, it is desirable to inverter is most in low-power
Fast shutdown, that is, shutdown power is relatively large, then arrange higher.
Meanwhile, open dynamo-electric pressure, forbid " orderly closedown " time delay, " orderly closedown " powerWith forbid opening machine time delay, adjusting of this 4 parameters must be combined together consideration: 1,WithSetting determine time delay after the machine of openingAfterwards
Inverter output power, inverter output power now have to be larger than " orderly closedown " power.2、WithJust determine
Time delay after often shutting downCell panel DC voltage afterwards, DC voltage now is necessarily less than and opens dynamo-electric pressure.
Described constant voltage mode is fixing to run DC voltage, it is set to the nominal mppt of photovoltaic DC-to-AC converter and run direct current
The lower limit of voltage range.
Description for the understanding of specific embodiment is only to understand the present invention for help, rather than is used for limiting this
Bright.Those skilled in the art all can carry out some using the thought of the present invention and change and change, as long as its technological means does not have
There are the thought departing from the present invention and main points, still within protection scope of the present invention.
Claims (4)
1. a kind of elimination grid-connected photovoltaic inverter misses the software implementation method of start and stop phenomenon, and described implementation method includes:
A) condition that setting grid-connected photovoltaic inverter starts and shuts down；
The method that b) time threshold is set；
C) method of mppt algorithm adjustment；
The method of the setting time threshold in step b) is: setting time delay、, when grid-connected photovoltaic inverter reaches entry condition
Afterwards, pass throughAfter restart combining inverter, after combining inverter starts, judge " sunset shutdown flag bit " whether set, such as
It is really,No longer orderly closedown in time；Setting time delay, after grid-connected photovoltaic inverter reaches halt condition,When
Interior no longer open machine, and by " sunset shutdown flag bit " set, described flag bit is used as the mark that machine is opened in sunrise；、、For time parameter.
2. a kind of elimination grid-connected photovoltaic inverter according to claim 1 misses the software implementation method of start and stop phenomenon, and it is special
Levy and be, in step a), the entry condition of grid-connected photovoltaic inverter is: when battery component voltage is higher than threshold voltage, start simultaneously
Net inverter；Halt condition is: is less than threshold power value when running power, combining inverter is shut down.
3. a kind of elimination grid-connected photovoltaic inverter according to claim 1 misses the software implementation method of start and stop phenomenon, and it is special
Levy and be, the method for adjustment of described mppt algorithm is:
Grid-connected photovoltaic inverter is in operation and is searching for prominent DC voltage value always using mppt function；In low-power
In the case of, battery power curve changes, and the DC voltage of maximum power point constantly reduces, and grid-connected photovoltaic inverter is not restarted
Mppt function, runs using constant voltage mode is fixing.
4. a kind of elimination grid-connected photovoltaic inverter according to claim 3 misses the software implementation method of start and stop phenomenon, and it is special
Levy and be, the power setting of described constant voltage mode is the 4% of grid-connected photovoltaic inverter rated power.
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| CN201410542274.3A CN104300578B (en) | 2014-10-15 | 2014-10-15 | Software achieving method for eliminating false starting and stopping of grid connection photovoltaic inverter |
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| CN104300578B true CN104300578B (en) | 2017-01-18 |
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| CN111181195B (en) * | 2020-01-13 | 2022-04-08 | 阳光新能源开发股份有限公司 | Light storage micro-grid system and self-starting method thereof |
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| CN103730911B (en) * | 2013-12-25 | 2015-08-19 | 常熟开关制造有限公司(原常熟开关厂） | The grid-connected control method of photovoltaic combining inverter and grid-connected photovoltaic system |
| CN104090501B (en) * | 2014-07-29 | 2017-01-18 | 阳光电源股份有限公司 | Standby control method and device for photovoltaic inverter and controller |
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Address after: 618000 No. 18, Third Section of Lushan South Road, Deyang City, Sichuan Province Patentee after: Dongfang Electric Automatic Control Engineering Co., Ltd. Address before: 618099 No. 18, Section 3, Lushan South Road, Deyang City, Sichuan Province Patentee before: Sichuan Orient Electric Automatic Control Engineering Co., Ltd. |