CN107994868A - A kind of photovoltaic module degradation detecting device and method based on dc power conversion - Google Patents
A kind of photovoltaic module degradation detecting device and method based on dc power conversion Download PDFInfo
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- CN107994868A CN107994868A CN201711473047.XA CN201711473047A CN107994868A CN 107994868 A CN107994868 A CN 107994868A CN 201711473047 A CN201711473047 A CN 201711473047A CN 107994868 A CN107994868 A CN 107994868A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 16
- 230000015556 catabolic process Effects 0.000 title claims abstract description 15
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 15
- 230000032683 aging Effects 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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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
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Abstract
The invention discloses a kind of photovoltaic module degradation detecting device and method based on dc power conversion, it is component aging that the present invention quickly detects photovoltaic using DC DC current transformers, basic principle is that the I V curves of photovoltaic cell are directly measured, carried out curve fitting by data obtained by measurement, its corresponding I V curve can be substantially obtained.Then, its corresponding open-circuit voltage Voc, short circuit current flow Isc, maximum power point voltage and electric current Vmpp and Impp can be tried to achieve successively.Aging and degree of aging whether occurs finally by the photovoltaic cell that compared with its theoretical values and theoretical curve, then can judge measured exactly.Photovoltaic module degradation detecting method of the present invention based on dc power conversion, not only control method is simple and clear, and infrastructure cost is relatively low, small volume, works at the same time that scope is wider, is applicable to the application of large, medium and small power.
Description
Technical field
The present invention relates to photovoltaic art, more particularly to a kind of photovoltaic module degradation detecting device based on dc power conversion
And method.
Background technology
The service life of photovoltaic generating system is generally 25 years.But since photovoltaic module inevitably occurs always
Change phenomenon, therefore generating efficiency is also inevitably affected.For example, the shadow caused by being subject to photovoltaic module aging
Ring, its generating efficiency is average to be declined with annual 0.8% speed, while causes photovoltaic module I-V curve to change.Specifically,
Compared to I-V, P-V curve that aging does not occur, a degree of deflection can occur for the curve of uneven aging.When uneven old
When changing more serious, due to that cannot be mutually matched between each photovoltaic module, even if all photovoltaic modulies be subject to intensity of illumination,
Temperature is just the same, its overall I-V, P-V curve even there is also multi-peaks phenomenon.On the one hand, due between photovoltaic module
Mismatch, each photovoltaic module can not be operated at its own maximum power point, so as to cause declining to a great extent for generated energy.Separately
On the one hand, the mismatch between photovoltaic module can also be further exacerbated by uneven aging, form vicious circle.
The method of the component aging detection of conventional photovoltaic includes electroluminescent method, ultraviolet light fluorescence method and infrared image analysis method
Deng, these methods there is detecting step is cumbersome, detection speed is slow, it is poor for applicability and cannot outdoor detection the defects of.And institute
Result is not directly perceived enough, inadequate digitization, have higher technical requirements to user, therefore commercial Application is not extensive.
The content of the invention
The present invention seeks to：A kind of photovoltaic module degradation detecting device and method based on dc power conversion, step are provided
Step is simple, and structural visual.
The technical scheme is that：
A kind of photovoltaic module degradation detecting device based on dc power conversion, it is characterised in that including：
DC-DC current transformers, described two input terminals of DC-DC current transformers are connected with photovoltaic module positive and negative anodes respectively, and two defeated
Outlet connection load；
Controller, the controller connect DC-DC current transformers, control its duty cycle d, and then adjust the work of photovoltaic module
Point is in the position of I-V curve；
Current Voltage harvester, gathers DC-DC current transformer input and output Current Voltages respectively, and gathered data is sent
To controller.
Preferably, it is also associated with filter capacitor Cin between two input terminals of the DC-DC current transformers.
A kind of photovoltaic module degradation detecting method based on dc power conversion, including：
S1, the Current Voltage to photovoltaic cell are directly measured, and are carried out curve fitting, obtained by data obtained by measurement
To its corresponding I-V curve；
S2, try to achieve the corresponding open-circuit voltage Voc of photovoltaic cell, short circuit current flow Isc, maximum power point voltage and electric current successively
Vmpp、Impp；
S3, finally by compared with its theoretical values and theoretical curve, judging whether measured photovoltaic cell is sent out
Raw aging and degree of aging.
Preferably, during the photovoltaic module ageing management, a DC-DC is cascaded between load in photovoltaic cell
Current transformer, by adjusting the size of DC-DC current transformer duty cycles d, adjusts operating point in the position of I-V curve, so as to obtain phase
Corresponding voltage and current value, it is assumed that M (d) is voltage conversion ratio, therefore DC-DC input and output voltages can be written as
Then, it is assumed that η is the transfer efficiency of DC-DC, then has
Formula (1) is substituted into (2), then is had
Wherein Rin and Rout is input and output resistance, in photovoltaic system, Rpv=Rin and Rload=Rout, therefore formula
(3) it is written as
Wherein Rpv refers to photovoltaic cell equivalent load, and Rload refers to the load resistance after being connected to DC-DC.
It is an advantage of the invention that：
Compared with prior art, photovoltaic module degradation detecting device and method of the present invention based on dc power conversion,
Not only control method is simple and clear, and infrastructure cost is relatively low, small volume, and it is wider to work at the same time scope, is applicable to large, medium and small
The application of type power.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and embodiments：
Fig. 1 is the DC-DC current transformers method detection component aging method operation principle block diagram of photovoltaic；
Fig. 2 is the DC-DC current transformers method detection component aging method simplification figure of photovoltaic；
Fig. 3 is DC-DC current transformer photovoltaic degradation detecting methods operating point service chart.
Embodiment
The present invention comes quickly to detect that photovoltaic is component aging using DC-DC current transformers, and basic principle is the I-V to photovoltaic cell
Curve is directly measured, and is carried out curve fitting by data obtained by measurement, and it is bent can to substantially obtain its corresponding I-V
Line.Then, can try to achieve successively its corresponding open-circuit voltage Voc, short circuit current flow Isc, maximum power point voltage and electric current Vmpp and
Impp.It is finally by the photovoltaic cell measured by compared with its theoretical values and theoretical curve, then can judging exactly
No generation aging and degree of aging.
As illustrated in fig. 1 and 2, the photovoltaic module degradation detecting device of the invention based on dc power conversion, including：
DC-DC current transformers, described two input terminals of DC-DC current transformers are connected with photovoltaic module positive and negative anodes respectively, and two defeated
Outlet connection loads, and filter capacitor Cin is also associated between two input terminals of the DC-DC current transformers；
Controller, the controller connect DC-DC current transformers, control its duty cycle d, and then adjust the work of photovoltaic module
Point is in the position of I-V curve；
Current Voltage harvester, gathers DC-DC current transformer input and output Current Voltages respectively, and gathered data is sent
To controller.
The present invention cascades a DC-DC current transformer in photovoltaic cell between load, by adjusting DC-DC current transformer duties
Size than d, adjusts operating point in the position of I-V curve, so as to obtain corresponding voltage and current value, it is assumed that M (d) is voltage
Ratio is changed, therefore DC-DC input and output voltages can be written as
Then, it is assumed that η is the transfer efficiency of DC-DC, then has
Formula (1) is substituted into (2), then is had
Wherein Rin and Rout is input and output resistance, in photovoltaic system, Rpv=Rin and Rload=Rout, therefore formula
(3) it is written as
Wherein Rpv refers to photovoltaic cell equivalent load, and Rload refers to the load resistance after being connected to DC-DC.
As shown in figure 3, using this method photovoltaic module real work point I-V curve change in location schematic diagram.With
First three methods compare, this control method is not only simple and clear, and cost is relatively low, small volume, and it is wider to work at the same time scope,
It is applicable to the application of large, medium and small power.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Present disclosure can be understood and implemented according to this, it is not intended to limit the scope of the present invention.It is all to lead according to the present invention
The modification for wanting the Spirit Essence of technical solution to be done, should be covered by the protection scope of the present invention.
Claims (4)
- A kind of 1. photovoltaic module degradation detecting device based on dc power conversion, it is characterised in that including：DC-DC current transformers, described two input terminals of DC-DC current transformers are connected with photovoltaic module positive and negative anodes respectively, two output terminals Connection load；Controller, the controller connect DC-DC current transformers, control its duty cycle d, and then the operating point for adjusting photovoltaic module exists The position of I-V curve；Current Voltage harvester, gathers DC-DC current transformer input and output Current Voltages respectively, and gathered data is sent to control Device processed.
- 2. the photovoltaic module degradation detecting device according to claim 1 based on dc power conversion, it is characterised in that institute State and be also associated with filter capacitor Cin between two input terminals of DC-DC current transformers.
- A kind of 3. photovoltaic module degradation detecting method based on dc power conversion, it is characterised in that including：S1, the Current Voltage to photovoltaic cell are directly measured, and are carried out curve fitting by data obtained by measurement, are obtained it Corresponding I-V curve；S2, try to achieve the corresponding open-circuit voltage Voc of photovoltaic cell, short circuit current flow Isc, maximum power point voltage and electric current successively Vmpp、Impp；S3, finally by compared with its theoretical values and theoretical curve, judging whether measured photovoltaic cell occurs always Change and degree of aging.
- 4. the photovoltaic module degradation detecting method according to claim 3 based on dc power conversion, it is characterised in that institute During stating photovoltaic module ageing management, a DC-DC current transformer is cascaded between load in photovoltaic cell, passes through adjusting The size of DC-DC current transformer duty cycles d, adjusts operating point in the position of I-V curve, so as to obtain corresponding voltage and current Value, it is assumed that M (d) is voltage conversion ratio, therefore DC-DC input and output voltages can be written as<mrow> <msub> <mi>V</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <mfrac> <msub> <mi>V</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mrow> <mi>M</mi> <mrow> <mo>(</mo> <mi>d</mi> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>Then, it is assumed that η is the transfer efficiency of DC-DC, then has<mrow> <mi>&eta;</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>I</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> </mrow> <mrow> <msubsup> <mi>V</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> <mn>2</mn> </msubsup> <mo>/</mo> <msub> <mi>R</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> </mrow> </mfrac> <mo>=</mo> <msup> <mrow> <mo>(</mo> <mfrac> <msub> <mi>V</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> <msub> <mi>V</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> </mfrac> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>R</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <msub> <mi>R</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>Formula (1) is substituted into (2), then is had<mrow> <mi>&eta;</mi> <mo>=</mo> <mi>M</mi> <msup> <mrow> <mo>(</mo> <mi>d</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>R</mi> <mrow> <mi>i</mi> <mi>n</mi> </mrow> </msub> <msub> <mi>R</mi> <mrow> <mi>o</mi> <mi>u</mi> <mi>t</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>Wherein Rin and Rout is input and output resistance, in photovoltaic system, Rpv=Rin and Rload=Rout, therefore formula (3) It is written as<mrow> <msub> <mi>R</mi> <mrow> <mi>P</mi> <mi>V</mi> </mrow> </msub> <mo>=</mo> <mi>&eta;</mi> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>R</mi> <mrow> <mi>l</mi> <mi>o</mi> <mi>a</mi> <mi>d</mi> </mrow> </msub> <mrow> <mi>M</mi> <msup> <mrow> <mo>(</mo> <mi>d</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>Wherein Rpv refers to photovoltaic cell equivalent load, and Rload refers to the load resistance after being connected to DC-DC.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112910411A (en) * | 2021-01-25 | 2021-06-04 | 杭州易达光电有限公司 | Regionalized photovoltaic operation and maintenance management system |
| CN115514021A (en) * | 2022-11-11 | 2022-12-23 | 云南电网能源投资有限责任公司 | Fault regulation and control method and system for distributed photovoltaic power station and computer equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112910411A (en) * | 2021-01-25 | 2021-06-04 | 杭州易达光电有限公司 | Regionalized photovoltaic operation and maintenance management system |
| CN115514021A (en) * | 2022-11-11 | 2022-12-23 | 云南电网能源投资有限责任公司 | Fault regulation and control method and system for distributed photovoltaic power station and computer equipment |
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Application publication date: 20180504 |