CN105529739A - Frequent out-of-network prevention method of photovoltaic power generation system - Google Patents
Frequent out-of-network prevention method of photovoltaic power generation system Download PDFInfo
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- CN105529739A CN105529739A CN201610023642.2A CN201610023642A CN105529739A CN 105529739 A CN105529739 A CN 105529739A CN 201610023642 A CN201610023642 A CN 201610023642A CN 105529739 A CN105529739 A CN 105529739A
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- photovoltaic
- timer
- time
- voltage
- polar plate
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010248 power generation Methods 0.000 title abstract description 4
- 230000002265 prevention Effects 0.000 title abstract 4
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000006978 adaptation Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000011084 recovery Methods 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 relates to a frequent out-of-network prevention method of a photovoltaic power generation system. The frequent out-of-network prevention method involves a photovoltaic pole plate voltage sampling unit, a first timer, a second timer, a third timer, a photovoltaic inversion module and a control unit, wherein the photovoltaic pole plate voltage sampling unit is used for sampling the voltage of a photovoltaic pole plate in real time, the control unit is used for correspondingly controlling the photovoltaic inversion module to enter a standby state according to the judgment on timekeeping time of the first timer and the second timer and also recording a corresponding mode, and the control unit is used for controlling the photovoltaic inversion module to enter an inversion state according to the judgment on timekeeping time of the third timer. According to the frequent out-of-network prevention method of the photovoltaic power generation system, proposed by the invention, switching between the standby state and a grid-connected state can be rapidly fulfilled by changing a judgment condition of the system on a standby condition when PV voltage falls and recovers within a short time, and the problem of environmental adaptation with regard to a standby start-stop control scheme in a conventional control technique is solved.
Description
Technical field
The present invention relates to a kind of method that photovoltaic generating system prevents frequent off-grid.
Background technology
Photovoltaic generating system because of its PV side DC source be photovoltaic polar plate, its direct voltage constantly can convert along with the power of illumination, and inverter carries out work according to MPPT curve in certain input voltage range.
Current start and stop logic is substantially all work higher than during working voltage point according to PV voltage, lower than working voltage and higher than standby during standby voltage, lower than the mode of operation of off-grid during standby voltage.This design of operating modes is simple, practical, but under some feature environmental condition, there will be the situation that recovering immediately after decline in the short time appears in PV side voltage, if run according to this kind of mode of operation, then there will be inverter off-grid, reduce energy output, even occur that inverter is frequently de-grid-connected, increase contactor action frequency, reduce the risk in life-span.
Summary of the invention
A kind of photovoltaic generating system is the object of the present invention is to provide to prevent the method for frequent off-grid, to overcome the defect existed in prior art.
For achieving the above object, technical scheme of the present invention is: a kind of photovoltaic generating system prevents the method for frequent off-grid, comprise: photovoltaic polar plate voltage sampling unit, the first timer, the second timer, the 3rd timer, photovoltaic inversion modules and control unit, described photovoltaic polar plate voltage sampling unit is used for real-time sampling photovoltaic polar plate voltage;
Described first timer is used for when the voltage of photovoltaic polar plate is lower than the first setting voltage threshold value U
sLshi Jinhang timing, when the voltage of described photovoltaic polar plate is higher than described first setting voltage threshold value U
sLtime timing reset;
Described second timer is used for when the voltage of photovoltaic polar plate is lower than the second setting voltage threshold value U
sFshi Jinhang timing, when the voltage of described photovoltaic polar plate is higher than described second setting voltage threshold value U
sFtime timing reset;
Described 3rd timer is used for the voltage of photovoltaic polar plate higher than the 3rd setting voltage threshold value U
oNshi Jinhang timing, when the voltage of described photovoltaic polar plate is lower than described three setting voltage threshold value U
oNtime timing reset;
Described control unit for recording the mode of operation of described photovoltaic inversion modules, and adjusts the operating state of described photovoltaic inversion modules according to described first timer, described second timer and described 3rd timer;
Described photovoltaic polar plate voltage sampling unit real-time sampling photovoltaic polar plate voltage;
When the timing time of described first timer is greater than t
ltime, described control unit controls described photovoltaic inversion modules and enters holding state, and is recorded as standby mode;
When the timing time of described second timer is greater than t
ftime, described control unit controls described photovoltaic inversion modules and enters holding state, and is recorded as quick standby mode;
When described photovoltaic inversion modules is in standby mode and the timing time of described 3rd timer is greater than t
lRtime, described control unit controls described photovoltaic inversion modules and enters inverter mode;
When described photovoltaic inversion modules be in quick standby mode and the described 3rd time device timing time be greater than t
fRtime, described control unit controls described photovoltaic inversion modules and enters inverter mode;
Wherein, described first setting voltage threshold value U
sLbe greater than described second setting voltage threshold value U
sF, t
l> t
f, t
lR> t
fR.
In an embodiment of the present invention, t
l> 100 × t
f, t
lR> 10 × t
fR.
In an embodiment of the present invention, 0.5s≤t
l≤ 5s, 0.5ms≤t
f≤ 5ms.
In an embodiment of the present invention, 1min≤t
lR≤ 30min, 0.5s≤t
fR≤ 20s.
In an embodiment of the present invention, U
sL=(1-A) × U
oN, U
sF=(1-B) × U
oN, A>B, and A, B are constant.
In an embodiment of the present invention, A span is: 0.01 to 0.05; B span is: 0.03 to 0.07.
Compared to prior art, the present invention has following beneficial effect: a kind of photovoltaic generating system proposed by the invention prevents the method for frequent off-grid, by changing system to the decision condition of waiting condition, PV voltage occur the short time fall recovery time, standby and grid-connected switching can be carried out fast, solve the environmental adaptation problem about the control program of standby start and stop in existing control technology, decrease the energy output caused because of environmental factor in inverter power generation process to reduce and the frequent off-grid of inverter possible, reduce the start-stop time of inverter, improve inverter operating efficiency and working life.Reduce the mechanical devices such as contactor, relay action frequency, contactor, extend its working life.
Embodiment
Below technical scheme of the present invention is specifically described.
A kind of photovoltaic generating system of the present invention prevents the method for frequent off-grid, comprise: photovoltaic polar plate voltage sampling unit, the first timer, the second timer, the 3rd timer, photovoltaic inversion modules and control unit, photovoltaic polar plate voltage sampling unit is used for real-time sampling photovoltaic polar plate voltage;
First timer is used for when the voltage of photovoltaic polar plate is lower than the first setting voltage threshold value U
sLshi Jinhang timing, when the voltage of photovoltaic polar plate is higher than the first setting voltage threshold value U
sLtime timing reset;
Second timer is used for when the voltage of photovoltaic polar plate is lower than the second setting voltage threshold value U
sFshi Jinhang timing, when the voltage of photovoltaic polar plate is higher than the second setting voltage threshold value U
sFtime timing reset;
3rd timer is used for the voltage of photovoltaic polar plate higher than the 3rd setting voltage threshold value U
oNshi Jinhang timing, when the voltage of photovoltaic polar plate is lower than three setting voltage threshold value U
oNtime timing reset;
Control unit for recording the mode of operation of photovoltaic inversion modules, and adjusts the operating state of photovoltaic inversion modules according to the first timer, the second timer and the 3rd timer;
Further, in the present embodiment, photovoltaic polar plate voltage sampling unit real-time sampling photovoltaic polar plate voltage;
When the timing time of the first timer is greater than t
ltime, control unit controls photovoltaic inversion modules and enters holding state, and is recorded as standby mode;
When the timing time of the second timer is greater than t
ftime, control unit controls photovoltaic inversion modules and enters holding state, and is recorded as quick standby mode;
When photovoltaic inversion modules is in standby mode and the timing time of the 3rd timer is greater than t
lRtime, control unit controls photovoltaic inversion modules and enters inverter mode;
When photovoltaic inversion modules be in quick standby mode and the 3rd time device timing time be greater than t
fRtime, control unit controls photovoltaic inversion modules and enters inverter mode;
Wherein, the first setting voltage threshold value U
sLbe greater than the second setting voltage threshold value U
sF, t
l> t
f, t
lR> t
fR.
Further, in the present embodiment, preferably, t
l> 100 × t
f, t
lR> 10 × t
fR.
Further, in the present embodiment, according to current engineering experience, 0.5s≤t
l≤ 5s, 0.5ms≤t
f≤ 5ms, 1min≤t
lR≤ 30min, 0.5s≤t
fR≤ 20s.
Further, in the present embodiment, U
sL=(1-A) × U
oN, U
sF=(1-B) × U
oN, A>B, and A, B are constant.Preferably, A span is: 0.01 to 0.05; B span is: 0.03 to 0.07.
Further, in the present embodiment, nominal input voltage U and the U of photovoltaic generating system
oNrelation; 3rd setting voltage threshold value U
oNfor the minimum input voltage of photovoltaic generating system, i.e. cut-in voltage, preferably, U
oNvalue is 520V, U
sLvalue is 500V, U
sFvalue is 490V.
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (6)
1. a photovoltaic generating system prevents the method for frequent off-grid, it is characterized in that: comprising: photovoltaic polar plate voltage sampling unit, the first timer, the second timer, the 3rd timer, photovoltaic inversion modules and control unit, described photovoltaic polar plate voltage sampling unit is used for real-time sampling photovoltaic polar plate voltage;
Described first timer is used for when the voltage of photovoltaic polar plate is lower than the first setting voltage threshold value U
sLshi Jinhang timing, when the voltage of described photovoltaic polar plate is higher than described first setting voltage threshold value U
sLtime timing reset;
Described second timer is used for when the voltage of photovoltaic polar plate is lower than the second setting voltage threshold value U
sFshi Jinhang timing, when the voltage of described photovoltaic polar plate is higher than described second setting voltage threshold value U
sFtime timing reset;
Described 3rd timer is used for the voltage of photovoltaic polar plate higher than the 3rd setting voltage threshold value U
oNshi Jinhang timing, when the voltage of described photovoltaic polar plate is lower than described three setting voltage threshold value U
oNtime timing reset;
Described control unit for recording the mode of operation of described photovoltaic inversion modules, and adjusts the operating state of described photovoltaic inversion modules according to described first timer, described second timer and described 3rd timer;
Described photovoltaic polar plate voltage sampling unit real-time sampling photovoltaic polar plate voltage;
When the timing time of described first timer is greater than t
ltime, described control unit controls described photovoltaic inversion modules and enters holding state, and is recorded as standby mode;
When the timing time of described second timer is greater than t
ftime, described control unit controls described photovoltaic inversion modules and enters holding state, and is recorded as quick standby mode;
When described photovoltaic inversion modules is in standby mode and the timing time of described 3rd timer is greater than t
lRtime, described control unit controls described photovoltaic inversion modules and enters inverter mode;
When described photovoltaic inversion modules be in quick standby mode and the described 3rd time device timing time be greater than t
fRtime, described control unit controls described photovoltaic inversion modules and enters inverter mode;
Wherein, described first setting voltage threshold value U
sLbe greater than described second setting voltage threshold value U
sF, t
l> t
f, t
lR> t
fR.
2. a kind of photovoltaic generating system according to claim 1 prevents the method for frequent off-grid, it is characterized in that, t
l> 100 × t
f, t
lR> 10 × t
fR.
3. a kind of photovoltaic generating system according to claim 2 prevents the method for frequent off-grid, it is characterized in that, 0.5s≤t
l≤ 5s, 0.5ms≤t
f≤ 5ms.
4. a kind of photovoltaic generating system according to claim 2 prevents the method for frequent off-grid, it is characterized in that, 1min≤t
lR≤ 30min, 0.5s≤t
fR≤ 20s.
5. a kind of photovoltaic generating system according to claim 1 prevents the method for frequent off-grid, it is characterized in that, U
sL=(1-A) × U
oN, U
sF=(1-B) × U
oN, A>B, and A, B are constant.
6. a kind of photovoltaic generating system according to claim 1 prevents the method for frequent off-grid, it is characterized in that, A span is: 0.01 to 0.05; B span is: 0.03 to 0.07.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610023642.2A CN105529739B (en) | 2016-01-14 | 2016-01-14 | A kind of method that photovoltaic generating system prevents frequent off-grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610023642.2A CN105529739B (en) | 2016-01-14 | 2016-01-14 | A kind of method that photovoltaic generating system prevents frequent off-grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105529739A true CN105529739A (en) | 2016-04-27 |
| CN105529739B CN105529739B (en) | 2018-02-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347202A (en) * | 2017-01-23 | 2018-07-31 | 宝山钢铁股份有限公司 | A kind of method that large capacity wind turbine is temporarily dropped with frequency converter reactance voltage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006187196A (en) * | 1999-04-26 | 2006-07-13 | Sharp Corp | System interconnection inverter arrangement |
| CN103731020A (en) * | 2014-01-24 | 2014-04-16 | 四川英杰电气股份有限公司 | Standby control method of photovoltaic inverter |
| 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 |
| CN104333215A (en) * | 2014-11-25 | 2015-02-04 | 阳光电源股份有限公司 | Method and device for suppressing frequent starting and stopping of inverter |
-
2016
- 2016-01-14 CN CN201610023642.2A patent/CN105529739B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006187196A (en) * | 1999-04-26 | 2006-07-13 | Sharp Corp | System interconnection inverter arrangement |
| CN103731020A (en) * | 2014-01-24 | 2014-04-16 | 四川英杰电气股份有限公司 | Standby control method of photovoltaic inverter |
| 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 |
| CN104333215A (en) * | 2014-11-25 | 2015-02-04 | 阳光电源股份有限公司 | Method and device for suppressing frequent starting and stopping of inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347202A (en) * | 2017-01-23 | 2018-07-31 | 宝山钢铁股份有限公司 | A kind of method that large capacity wind turbine is temporarily dropped with frequency converter reactance voltage |
| CN108347202B (en) * | 2017-01-23 | 2021-04-13 | 宝山钢铁股份有限公司 | Method for resisting voltage sag of frequency converter for high-capacity fan |
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| CN105529739B (en) | 2018-02-16 |
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Address after: 361006 torch garden, torch high tech Zone, Xiamen, Fujian 457 Patentee after: Kehua Data Co.,Ltd. Address before: 361006 torch garden, torch high tech Zone, Xiamen, Fujian 457 Patentee before: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Address after: 361006 torch garden, torch high tech Zone, Xiamen, Fujian 457 Patentee after: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Address before: 361006 torch garden, torch high tech Zone, Xiamen, Fujian 457 Patentee before: XIAMEN KEHUA HENGSHENG Co.,Ltd. |
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Effective date of registration: 20220419 Address after: 361001 room 208-38, Hengye building, No. 100, Xiangxing Road, Xiamen Torch High tech Zone (Xiang'an) Industrial Zone, Xiamen, Fujian Patentee after: Xiamen Kehua shuneng Technology Co.,Ltd. Address before: 361006 torch garden, torch high tech Zone, Xiamen, Fujian 457 Patentee before: Kehua Data Co.,Ltd. |