CN102122828A - Method for controlling output power of photovoltaic inverter - Google Patents
Method for controlling output power of photovoltaic inverter Download PDFInfo
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- CN102122828A CN102122828A CN2011100934686A CN201110093468A CN102122828A CN 102122828 A CN102122828 A CN 102122828A CN 2011100934686 A CN2011100934686 A CN 2011100934686A CN 201110093468 A CN201110093468 A CN 201110093468A CN 102122828 A CN102122828 A CN 102122828A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 210000003850 cellular structure Anatomy 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 8
- 230000008034 disappearance Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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 provides a method for controlling output power of a photovoltaic inverter. The method comprises the following steps: detecting the rate of change of the direct current bus voltage of the photovoltaic inverter; and when the direct current bus voltage is reduced and the rate of change is more than the threshold, reducing the output power of the photovoltaic inverter so that the photovoltaic inverter keeps grid-connected. The method is characterized by judging whether the photovoltaic cell pack is shadowed according to the rate of change of the direct current bus voltage based on the power change prediction, reducing the output power at the right time to ensure the photovoltaic cell pack and the photovoltaic inverter to be newly balanced and maintaining the direct current bus voltage to ensure the inverter to be continuously grid-connected. The method has the following advantages: the calculation amount is small; the reliability is high; the photovoltaic inverter can be effectively avoided from breaking away from the grid when being suddenly shadowed; and the method is easily applied in practice.
Description
Technical field
The present invention relates to field of photovoltaic power generation, particularly a kind of photovoltaic DC-to-AC converter output power control method.This method is based on the power output variation prediction of photovoltaic DC-to-AC converter.
Background technology
At present, photovoltaic combining inverter is widely used in field of photovoltaic power generation.In actual applications, photovoltaic cell component for example can run into blocking of the shade that caused by cloud layer or building, causes the photovoltaic cell component power output to reduce.At this moment, if the power generating of photovoltaic DC-to-AC converter before keeping blocking can cause the inverter busbar voltage to reduce rapidly, when busbar voltage was lower than minimum and is incorporated into the power networks voltage, this photovoltaic DC-to-AC converter was understood off-grid.This situation is the most common when the solar irradiation quantitative changeization is violent at noon.For guaranteeing that photovoltaic DC-to-AC converter can Maximum Power Output, transform out maximum electric energy, must reduce number of times and the time span that inverter runs into off-grid when blocking daytime.
Summary of the invention
At above problem of the prior art, need a kind ofly can remain the method that photovoltaic DC-to-AC converter generates electricity by way of merging two or more grid systems according to the situation of blocking of shade to photovoltaic cell component.
For this reason, the present invention proposes a kind of control method of photovoltaic DC-to-AC converter power output, comprising: the rate of change that detects the DC bus-bar voltage of photovoltaic DC-to-AC converter; When DC bus-bar voltage reduces and rate of change during greater than threshold value, reduce the power output of photovoltaic DC-to-AC converter, make that photovoltaic DC-to-AC converter keeps generating electricity by way of merging two or more grid systems.
This method is predicted based on variable power, rate of change according to DC bus-bar voltage judges whether to take place shade shading light photovoltaic cell components, reduces power output in good time, makes photovoltaic cell component and photovoltaic DC-to-AC converter reach new balance, keep DC bus-bar voltage, make inverter continue to generate electricity by way of merging two or more grid systems.Amount of calculation of the present invention is little, reliability is high, can effectively avoid photovoltaic DC-to-AC converter off-grid when prominent chance is blocked, and uses in practice easily.
Preferably, in above method, with the rate of change of period of time T detection DC bus-bar voltage, and according to Δ P=k * (Δ V
n+ (Δ V
n-Δ V
N-1)) reduce the power output of photovoltaic DC-to-AC converter, wherein,
Δ P represents to expect variable power;
Δ V
n=V
N-1-V
n, represent the variation of direct voltage in the n cycle, V
N-1Represent n-1 cycle direct voltage constantly, V
nRepresent n cycle direct voltage constantly;
Δ V
N-1=V
N-2-V
N-1, represent the variation of direct voltage in the n-1 cycle; N is the integer more than or equal to 2; V
N-2Represent n-2 cycle direct voltage constantly;
K is a positive number.
More preferably, wherein
Wherein C is the bus capacitor capacity of photovoltaic DC-to-AC converter, and U is a n cycle DC bus-bar voltage constantly.
Description of drawings
The present invention is described in detail according to embodiment and accompanying drawing below.
Fig. 1 is the flow chart of the control method of photovoltaic DC-to-AC converter power output according to an embodiment of the invention;
Fig. 2 is the schematic diagram of DC bus-bar voltage period T variation in time.
Embodiment
According to embodiments of the invention, a kind of control method of photovoltaic DC-to-AC converter power output is proposed, comprising: the rate of change that detects the DC bus-bar voltage of photovoltaic DC-to-AC converter; When DC bus-bar voltage reduces and rate of change during greater than threshold value, reduce the power output of photovoltaic DC-to-AC converter, make that photovoltaic DC-to-AC converter keeps generating electricity by way of merging two or more grid systems.According to this method, when photovoltaic cell component runs into shade and blocks, can suitably reduce the inverter power output according to the rate of change of photovoltaic DC-to-AC converter busbar voltage, thereby keep the inverter busbar voltage, make not off-grid of inverter.
As shown in Figure 1, when the shade that runs into cloud layer or building when photovoltaic cell component blocked, the power output of photovoltaic cell component can reduce, if this moment, photovoltaic DC-to-AC converter kept producing power generating before blocking, the inverter busbar voltage was reduced rapidly.
In the method according to the embodiment of the invention, according to busbar voltage change rate forecast photovoltaic cell component whether shade takes place and block, and judging the inverter power output variation that expection takes place to calculate when shade blocks.For example, when busbar voltage in the time T=10ms reduce to surpass 15V, promptly think and block, and busbar voltage is thought when returning to big or small when blocking generation and blocked disappearance.
For example, according to formula Δ P=k * (Δ V
n+ (Δ V
n-Δ V
N-1)) inverter power of calculation expectation changes, wherein Δ P represents to expect variable power;
Δ V
nThe absolute value of representing DC voltage change in the n cycle, i.e. Δ V
n=V
N-1-V
n
Δ V
N-1The absolute value of representing DC voltage change in the n-1 cycle, i.e. Δ V
N-1=V
N-2-V
N-1, n is the integer more than or equal to 2, as shown in Figure 2.
K is the coefficient that voltage change ratio is converted power, is positive number, it will be appreciated by those skilled in the art that k can adjust frequency according to actual application environment of the present invention and power output to be provided with.Preferably, k generally can get
T is for detecting the time of change in voltage, and C is an inverter bus capacitor capacity, and U is a nT cycle DC bus-bar voltage constantly.
Reduce power output P according to Δ P
n=P
N-1-Δ P wherein is P
nBe n cycle expectation inverter power output constantly, P
N-1It is n-1 cycle inverter power output constantly.Δ P is blocking when taking place permanently in just, and when promptly blocking, power only reduces, and does not increase, and blocks disappearance up to judging, and just can increase power again.
For example, as Δ V
n-Δ V
N-1＞=0 o'clock, the expression busbar voltage was quickened to descend, and this may cause owing to shade has blocked photovoltaic cell component and blocked aggravation.At this moment, according to P
n=P
N-1-Δ P, the inverter power output reduces, and generates electricity by way of merging two or more grid systems to keep this inverter.
The present invention is not limited thereto execution mode, based on the related realization assembly of inventive concept all in protection scope of the present invention.
Claims (3)
1. the control method of a photovoltaic DC-to-AC converter power output is characterized in that, comprising:
Detect the rate of change of the DC bus-bar voltage of photovoltaic DC-to-AC converter;
When DC bus-bar voltage reduces and rate of change during greater than threshold value, reduce the power output of photovoltaic DC-to-AC converter, make that photovoltaic DC-to-AC converter keeps generating electricity by way of merging two or more grid systems.
2. the method for claim 1 is characterized in that, with the rate of change of period of time T detection DC bus-bar voltage, and according to Δ P=k * (Δ V
n+ (Δ V
n-Δ V
N-1)) reduce the power output of photovoltaic DC-to-AC converter, wherein,
Δ P represents to expect variable power;
Δ V
n=V
N-1-V
n, represent the variation of direct voltage in the n cycle, V
N-1Represent n-1 cycle direct voltage constantly, V
nRepresent n cycle direct voltage constantly;
Δ V
N-1=V
N-2-V
N-1, represent the variation of direct voltage in the n-1 cycle; N is the integer more than or equal to 2; V
N-2Represent n-2 cycle direct voltage constantly;
K is a positive number.
3. method as claimed in claim 2 is characterized in that,
Wherein
Wherein C is the bus capacitor capacity of photovoltaic DC-to-AC converter, and U is a n cycle DC bus-bar voltage constantly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110093468.6A CN102122828B (en) | 2011-04-14 | 2011-04-14 | Method for controlling output power of photovoltaic inverter |
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| CN201110093468.6A CN102122828B (en) | 2011-04-14 | 2011-04-14 | Method for controlling output power of photovoltaic inverter |
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| CN102122828A true CN102122828A (en) | 2011-07-13 |
| CN102122828B CN102122828B (en) | 2014-12-03 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332730A (en) * | 2011-08-17 | 2012-01-25 | 国家电网公司 | Method and system for controlling generated output of renewable energy source |
| CN102368670A (en) * | 2011-10-09 | 2012-03-07 | 山亿新能源股份有限公司 | Sensor-free type maximum power tracking control method |
| CN102522782A (en) * | 2011-12-19 | 2012-06-27 | 苏州达方电子有限公司 | Solar current converter system and control method thereof |
| CN103412609A (en) * | 2013-08-21 | 2013-11-27 | 西安龙腾新能源科技发展有限公司 | Output power control method of photovoltaic grid-connected inverter |
| CN103457499A (en) * | 2013-09-17 | 2013-12-18 | 上海交通大学 | Grid-connected inverter and compensation method of direct current bus voltage in grid-connected inverter |
| CN105356506A (en) * | 2015-11-23 | 2016-02-24 | 中国电力科学研究院 | Control method of connection converter for low-voltage AC/DC hybrid power distribution system |
| CN105587476A (en) * | 2016-01-13 | 2016-05-18 | 中国农业大学 | Condition monitoring method and device for wind turbine system |
| CN109672166A (en) * | 2017-10-17 | 2019-04-23 | 丰郅(上海)新能源科技有限公司 | Power optimized system and its optimization method |
| CN111949065A (en) * | 2020-08-25 | 2020-11-17 | 深圳市英威腾电气股份有限公司 | Photovoltaic water pump system and power regulation and control method, device, equipment and medium thereof |
| CN112019015A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
-
2011
- 2011-04-14 CN CN201110093468.6A patent/CN102122828B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332730A (en) * | 2011-08-17 | 2012-01-25 | 国家电网公司 | Method and system for controlling generated output of renewable energy source |
| CN102332730B (en) * | 2011-08-17 | 2015-05-20 | 国家电网公司 | Method and system for controlling generated output of renewable energy source |
| CN102368670B (en) * | 2011-10-09 | 2014-03-19 | 山亿新能源股份有限公司 | Sensor-free type maximum power tracking control method |
| CN102368670A (en) * | 2011-10-09 | 2012-03-07 | 山亿新能源股份有限公司 | Sensor-free type maximum power tracking control method |
| CN102522782A (en) * | 2011-12-19 | 2012-06-27 | 苏州达方电子有限公司 | Solar current converter system and control method thereof |
| CN103412609A (en) * | 2013-08-21 | 2013-11-27 | 西安龙腾新能源科技发展有限公司 | Output power control method of photovoltaic grid-connected inverter |
| CN103412609B (en) * | 2013-08-21 | 2016-02-10 | 西安龙腾新能源科技发展有限公司 | The output power control method of photovoltaic combining inverter |
| CN103457499A (en) * | 2013-09-17 | 2013-12-18 | 上海交通大学 | Grid-connected inverter and compensation method of direct current bus voltage in grid-connected inverter |
| CN105356506A (en) * | 2015-11-23 | 2016-02-24 | 中国电力科学研究院 | Control method of connection converter for low-voltage AC/DC hybrid power distribution system |
| CN105587476A (en) * | 2016-01-13 | 2016-05-18 | 中国农业大学 | Condition monitoring method and device for wind turbine system |
| CN105587476B (en) * | 2016-01-13 | 2018-03-13 | 中国农业大学 | A kind of state monitoring method and device for wind generator system |
| CN109672166A (en) * | 2017-10-17 | 2019-04-23 | 丰郅(上海)新能源科技有限公司 | Power optimized system and its optimization method |
| CN112019015A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN111949065A (en) * | 2020-08-25 | 2020-11-17 | 深圳市英威腾电气股份有限公司 | Photovoltaic water pump system and power regulation and control method, device, equipment and medium thereof |
| CN111949065B (en) * | 2020-08-25 | 2022-05-17 | 深圳市英威腾电气股份有限公司 | Photovoltaic water pump system and power regulation and control method, device, equipment and medium thereof |
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Inventor after: Cui Peiju Inventor after: Zhou Qian Inventor after: Li Yuanfu Inventor after: Pan Wenwu Inventor before: Zhou Qian Inventor before: Chen Xiaogao |
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