CN104300578A - 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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- CN104300578A CN104300578A CN201410542274.3A CN201410542274A CN104300578A CN 104300578 A CN104300578 A CN 104300578A CN 201410542274 A CN201410542274 A CN 201410542274A CN 104300578 A CN104300578 A CN 104300578A
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- 230000005611 electricity Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
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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
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- 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 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, particularly a kind of software implementation method eliminating grid-connected photovoltaic inverter mistake start and stop phenomenon.
Background technology
Along with the growing tension of the energy and the requirement of user to power supply reliability more and more higher, distributed power generation plays a part increasing in electric power system, photovoltaic (photovoltaic, PV) electricity generation system is one of very important generation mode in distributed power generation.Electric energy is served electrical network by solar power system, is called grid-connected system.
Photovoltaic combining inverter will realize unattended operation and automatically open machine and shutdown.At sunrise, when sunlight reaches some strength, inverter need 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 be got, and get general empirical value, and the generated output of Qi Jihou is very little again, is not suitable for generating electricity by way of merging two or more grid systems, and therefore can shut down again, sometimes even can repeat this process several times.At sunset, when power is to a certain extent low, namely can autostop, and battery component voltage when sometimes shutting down rear be not less than and open machine voltage threshold, therefore can open machine again.In a word, the automatic start-stop machine of combining inverter all likely misoperation several times, and each action all can cause grid-connected contactor to carry out separating brake and combined floodgate, therefore accumulates the life-span that greatly can shorten grid-connected contactor.
The main flow way of current this problem of solution has two kinds, and one increases false load device, and namely preposition power-sensing circuit, when power acquires a certain degree, inverter just starts.The second increases clock chip, extrapolates the time of sunrise sunset according to the on-site longitude and latitude of grid-connected photovoltaic inverter, then according to time start and stop photovoltaic DC-to-AC converter.
Summary of the invention
The present invention proposes a kind of needs employing software just can eliminate the method that grid-connected photovoltaic inverter misses start and stop phenomenon, the method its be applicable to the various single-chip microcomputer for photovoltaic DC-to-AC converter, DSP control chip etc., do not need to increase hardware, therefore can not increase extra cost.
A) condition that grid-connected photovoltaic inverter starts and shuts down is set;
B) method of setup times thresholding;
C) method of MPPT algorithm adjustment, MPPT and MPPT maximum power point tracking.
Further, the entry condition in step a) is: when battery component voltage is higher than threshold voltage, starts combining inverter; Halt condition is: when operate power is less than threshold power value, and combining inverter is shut down.
Further, time delay is set
,
, after grid-connected photovoltaic inverter reaches entry condition, pass through
after restart combining inverter, after combining inverter starts, judge " sunset shutdown flag bit " whether set, if so,
no longer orderly closedown in time;
Time delay is set
, after grid-connected photovoltaic inverter reaches halt condition,
no longer open machine 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 and adopts MPPT function searching for prominent DC voltage value always; Under low power scenarios; battery power curve changes; the direct voltage of maximum power point constantly reduces; MPPT search precision also declines thereupon; 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, adopts the fixing operation of constant voltage mode.
Further, the power setting of described constant voltage mode is 4% of grid-connected photovoltaic inverter rated power.
Technique effect of the present invention is as follows:
Grid-connected photovoltaic inverter is when photovoltaic plant unattended operation, automatically can complete sunrise and open machine and sunset stopping function, and the machine that opens once completes with shutting down, and there will not be the phenomenon repeatedly repeating start and stop by mistake, thus decrease the number of times of grid-connected contactor action, extend its life-span; And this invention does not need to increase extra device, has saved cost.
Accompanying drawing explanation
Machine flow chart is opened in Fig. 1 sunrise of the present invention.
Flow chart is shut down in Fig. 2 sunset of the present invention.
Embodiment
Below in conjunction with accompanying drawing, implementation of the present invention is described further.Corresponding to different control chips, adopt different program languages to realize.What this practical example adopted is the DSP28335 control chip of TI, describes, use C language programming realization to the method by following flow diagram and ins and outs, the program of having write is embedded among the control software design of photovoltaic DC-to-AC converter.
Fig. 1 is that machine flow chart is opened in sunrise of the present invention, first judges whether battery component voltage reaches and opens dynamo-electric pressure, reach and open the rear time delay of dynamo-electric pressure
, just formally start combining inverter afterwards.Then, after being incorporated into the power networks, judge whether it is " machine is opened in sunrise ", if " machine is opened in sunrise ", time delay is set
no longer " orderly closedown ", if the situation of " disorderly closedown " or " manual shut-down ", can not come into force, therefore can not affect the normal operation of inverter.
Fig. 2 is that flow chart is shut down in sunset of the present invention.First judge that whether operate power is lower than threshold value
if meet, be then judged as " sunset shutdown ", inverter is shut down, time delay
no longer open machine, be set up " sunset shutdown flag bit ", this flag bit is used as the mark that machine is opened in sunrise simultaneously.
The adjustment of MPPT function: under low power scenarios, when lower than
time, stop MPPT function, specify simultaneously
for running direct voltage.
Above-mentioned flow process details is described further: photovoltaic DC-to-AC converter control software design should possess " disorderly closedown ", " manual shut-down " and " orderly closedown " three kinds of halt modes." orderly closedown " be namely inverter send out power lower than shutting down power threshold and the halt mode that triggers, because only at sunset just can this thing happens, the autostop of photovoltaic DC-to-AC converter at sunset therefore can be realized by this halt mode.
Along with the sun sets, irradiance progressively reduces, inverter send out power lower than
after, switch to MPPT constant voltage mode, specify
for running direct voltage.Along with irradiance reduces further, when inverter send out power and progressively reduce, when lower than
after, trigger " orderly closedown ", by illustrating to judge being " sunset shutdown " above, and by " sunset shutdown flag bit " set, after this inverter is in stopped status, time delay
no longer open machine.Arranging this time delay is because after a shutdown, although photovoltaic cell component does not have power substantially, now voltage still may higher than opening dynamo-electric pressure
if there is no this time delay, then just probably open machine immediately after a shutdown, and due to power too low, once more shut down, this process likely can repeat 2, about 3 times, causes the error starting phenomenon of photovoltaic DC-to-AC converter.
After " sunset shutdown ", now terrestrial solar radiation degree is very low, is substantially all dusk, and therefore at second day before sunrise, photovoltaic DC-to-AC converter all can not open machine once again.In other words, if the first time photovoltaic DC-to-AC converter after " sunset shutdown " opens machine, then necessarily " machine is opened in sunrise ".Therefore " sunset shutdown flag bit " can as the judgement symbol whether being " machine is opened in sunrise ".
When sunrise in morning, open gate limit value when the voltage of photovoltaic cell component reaches
, time delay
, now inverter opens machine, judges " sunset shutdown flag bit " whether set simultaneously, if set, then can judge that this time opening machine is " machine is opened in sunrise ".After opening machine, power is now very little, probably can trigger " orderly closedown ", causes the mistakenly stop machine phenomenon of inverter, therefore in " machine is opened in sunrise " time delay afterwards
, forbid during this period " orderly closedown ", " emergency shutdown " and " manual shut-down " is still effective, and therefore breaking down during this period also can " disorderly closedown ", does not affect other functions of photovoltaic DC-to-AC converter.Design time delay
be cause the extreme case of control board power-off if there is electrical breakdown after causing UPS electricity to exhaust for a long time in order to prevent, after this extreme case occurs, control board power down, " sunset shutdown flag bit " will be eliminated, therefore can no longer time delay after opening machine
, likely can there is start and stop phenomenon by mistake.Add this time delay
after, 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 according to circumstances adjust, only otherwise depart from following design principle.Following further instruction is done to the setting principle of parameter in the method.
Switch the power of MPPT to constant voltage mode
: 4% of photovoltaic DC-to-AC converter rated power can be set to, under this power, not start the power loss that MPPT brings very little, negligible.Do not start MPPT and adopt constant voltage mode, ensure that operation stability, preventing the too low false triggering orderly closedown of power.
Open machine time delay
can be set to 2 minutes, this sunrise irradiance rising situation primarily of photovoltaic power plant locality is determined, and design principle is if extreme case causes control board power down, opens machine time delay
power output is afterwards tried one's best close to or is exceeded " orderly closedown " power
, make the mistake start-stop time produced be no more than 1 time.
Open dynamo-electric pressure
depend primarily on the needs of application, open dynamo-electric pressure and open acc power proportional, wish to open acc power slightly large, just arrange larger
, wish to open acc power less, just arrange less
.
" orderly closedown " power
also the needs of application are depended primarily on,
proportional with shutdown power, wish that the invertor operation time is longer, when namely shutting down, power is lower, then arrange lower
otherwise, wish that inverter is shut down as early as possible when low-power, namely shutdown power is relatively large, then arrange higher
.
Meanwhile, dynamo-electric pressure is opened
, forbid " orderly closedown " time delay
, " orderly closedown " power
machine time delay is opened with forbidding
, the consideration that must combine of adjusting of these 4 parameters: 1,
with
setting to determine after the machine of opening time delay
after inverter output power, inverter output power now must be greater than " orderly closedown " power
.2,
with
to determine after orderly closedown time delay
cell panel direct voltage afterwards, direct voltage now must be less than and opens dynamo-electric pressure
.
Described constant voltage mode is fixing runs direct voltage
, the MPPT being set to photovoltaic DC-to-AC converter nominal runs the lower limit of DC voltage range.
Description for the understanding of embodiment be only for help understand the present invention, instead of be used for restriction of the present invention.Those skilled in the art all can utilize thought of the present invention to carry out some and change and change, as long as its technological means does not depart from thought of the present invention and main points, still within protection scope of the present invention.
Claims (5)
1. eliminate the software implementation method that grid-connected photovoltaic inverter misses start and stop phenomenon, described implementation method comprises:
A) condition that grid-connected photovoltaic inverter starts and shuts down is set;
B) method of setup times thresholding;
C) method of MPPT algorithm adjustment.
2. a kind of software implementation method eliminating grid-connected photovoltaic inverter mistake start and stop phenomenon according to claim 1, it is characterized in that, in step a), the entry condition of grid-connected photovoltaic inverter is: when battery component voltage is higher than threshold voltage, starts combining inverter; Halt condition is: when operate power is less than threshold power value, and combining inverter is shut down.
3. a kind of software implementation method eliminating grid-connected photovoltaic inverter mistake start and stop phenomenon according to claim 1, it is characterized in that, the method for the setup times thresholding in step b) is: arrange time delay
,
, after grid-connected photovoltaic inverter reaches entry condition, pass through
after restart combining inverter, after combining inverter starts, judge " sunset shutdown flag bit " whether set, if so,
no longer orderly closedown in time;
Time delay is set
, after grid-connected photovoltaic inverter reaches halt condition,
no longer open machine 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.
4. any elimination grid-connected photovoltaic inverter according to claim 1 misses the software implementation method of start and stop phenomenon, and it is characterized in that, the method for adjustment of described MPPT algorithm is:
Grid-connected photovoltaic inverter is in operation and adopts MPPT function searching for prominent DC voltage value always; Under low power scenarios, battery power curve changes, and the direct voltage of maximum power point constantly reduces, and grid-connected photovoltaic inverter does not restart MPPT function, adopts the fixing operation of constant voltage mode.
5. a kind of software implementation method eliminating grid-connected photovoltaic inverter mistake start and stop phenomenon according to claim 4, it is characterized in that, the power setting of described constant voltage mode is 4% of grid-connected photovoltaic inverter rated power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921174A (en) * | 2015-12-25 | 2017-07-04 | 富士电机株式会社 | Control device |
| CN111181195A (en) * | 2020-01-13 | 2020-05-19 | 合肥阳光新能源科技有限公司 | Light storage micro-grid system and self-starting method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001128365A (en) * | 1999-10-25 | 2001-05-11 | Hitachi Ltd | Operating method for photovoltaic power generation system |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN104090501A (en) * | 2014-07-29 | 2014-10-08 | 阳光电源股份有限公司 | Standby control method and device for photovoltaic inverter and controller |
-
2014
- 2014-10-15 CN CN201410542274.3A patent/CN104300578B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001128365A (en) * | 1999-10-25 | 2001-05-11 | Hitachi Ltd | Operating method for photovoltaic power generation system |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN104090501A (en) * | 2014-07-29 | 2014-10-08 | 阳光电源股份有限公司 | Standby control method and device for photovoltaic inverter and controller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921174A (en) * | 2015-12-25 | 2017-07-04 | 富士电机株式会社 | Control device |
| CN111181195A (en) * | 2020-01-13 | 2020-05-19 | 合肥阳光新能源科技有限公司 | Light storage micro-grid system and self-starting method thereof |
| 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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| CN104300578B (en) | 2017-01-18 |
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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. |