CN208079018U - A kind of photovoltaic module degradation detecting device based on dc power transformation - Google Patents
A kind of photovoltaic module degradation detecting device based on dc power transformation Download PDFInfo
- Publication number
- CN208079018U CN208079018U CN201721900367.4U CN201721900367U CN208079018U CN 208079018 U CN208079018 U CN 208079018U CN 201721900367 U CN201721900367 U CN 201721900367U CN 208079018 U CN208079018 U CN 208079018U
- Authority
- CN
- China
- Prior art keywords
- photovoltaic module
- curve
- photovoltaic
- current
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a kind of photovoltaic module degradation detecting devices based on dc power transformation, it is component aging that the utility model quickly detects photovoltaic using DC-DC current transformers, basic principle is directly measured the I-V curve of photovoltaic cell, it is 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 Isc, maximum power point voltage and electric current Vmpp and Impp can be acquired successively.It is compared finally by with its theoretical values and theoretical curve, then can accurately judge whether measured photovoltaic cell occurs aging and degree of aging.The photovoltaic module degradation detecting method that the utility model is converted based on dc power, not only control method is simple and clear, and infrastructure cost is relatively low, small volume, works at the same time that range is wider, is applicable to the application of large, medium and small power.
Description
Technical field
The utility model is related to photovoltaic art, more particularly to a kind of photovoltaic module ageing management based on dc power transformation
Device.
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, due to by the shadow caused by photovoltaic module aging
It rings, generating efficiency is average to be declined with annual 0.8% speed, while photovoltaic module I-V curve being caused 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, and whole 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, 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
That there is detecting steps is cumbersome, detection speed is slow Deng, these methods, it is poor for applicability and cannot outdoor detection the defects of.And institute
Result is not intuitive enough, inadequate digitization, have higher technology requirement to user, therefore commercial Application is not extensive.
Utility model content
The utility model aim is：A kind of photovoltaic module degradation detecting device converted based on dc power, step are provided
Simply, and structural visual.
The technical solution of the utility model is：
A kind of photovoltaic module degradation detecting device based on dc power transformation, including：
DC-DC current transformers, two input terminals of the DC-DC current transformers are connect 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 ratio d, and then adjust the work of photovoltaic module
Point is in the position of I-V curve；
Current Voltage harvester acquires DC-DC current transformer input and output electric current voltages, and gathered data is sent respectively
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 transformation, including：
S1, the Current Voltage of photovoltaic cell is directly measured, is carried out curve fitting, is obtained by data obtained by measurement
To its corresponding I-V curve；
S2, the corresponding open-circuit voltage Voc of photovoltaic cell, short circuit current Isc, maximum power point voltage and electric current are acquired successively
Vmpp,Impp；
S3, it is compared finally by with its theoretical values and theoretical curve, judges 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 adjusts operating point in the position of I-V curve, to obtain phase by adjusting the size of DC-DC current transformer duty ratios d
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.
The utility model has the advantages that：
Compared with prior art, the photovoltaic module degradation detecting method that the utility model is converted based on dc power, no
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 range, is applicable to large, medium and small
The application of power.
Description of the drawings
The utility model is further described with reference to the accompanying drawings and embodiments：
Fig. 1 is the DC-DC current transformer methods detection component aging method operation principle block diagram of photovoltaic；
Fig. 2 is the DC-DC current transformer methods detection component aging method simplification figure of photovoltaic；
Fig. 3 is DC-DC current transformer photovoltaic degradation detecting methods operating point service chart.
Specific implementation mode
Quickly to detect, photovoltaic is component aging, and basic principle is to photovoltaic cell using DC-DC current transformers for the utility model
I-V curve directly measured, carried out curve fitting by data obtained by measurement, its corresponding I- can be substantially obtained
V curves.Then, its corresponding open-circuit voltage Voc, short circuit current Isc, maximum power point voltage and electric current Vmpp can be acquired successively
And Impp.It is compared finally by with its theoretical values and theoretical curve, then can accurately judge measured photovoltaic cell
Whether aging and degree of aging are occurred.
As illustrated in fig. 1 and 2, the photovoltaic module degradation detecting device based on dc power transformation of the utility model, including：
DC-DC current transformers, two input terminals of the DC-DC current transformers are connect 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 ratio d, and then adjust the work of photovoltaic module
Point is in the position of I-V curve；
Current Voltage harvester acquires DC-DC current transformer input and output electric current voltages, and gathered data is sent respectively
To controller.
The utility model cascades a DC-DC current transformer in photovoltaic cell between load, by adjusting DC-DC current transformers
The size of duty ratio d adjusts operating point in the position of I-V curve, 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
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 range,
It is applicable to the application of large, medium and small power.
Above-described embodiment is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
People can understand the content of the utility model and implement according to this, the scope of protection of the utility model can not be limited with this.It is all
According to the modification that the Spirit Essence of the utility model main technical schemes is done, should all cover in the scope of protection of the utility model
Within.
Claims (2)
1. a kind of photovoltaic module degradation detecting device based on dc power transformation, which is characterized in that including：
DC-DC current transformers, two input terminals of the DC-DC current transformers are connect with photovoltaic module positive and negative anodes respectively, two output ends
Connection load；
Controller, the controller connect DC-DC current transformers, control its duty ratio d, and then the operating point for adjusting photovoltaic module exists
The position of I-V curve；
Current Voltage harvester acquires DC-DC current transformer input and output electric current voltages, and gathered data is sent to control respectively
Device processed.
2. the photovoltaic module degradation detecting device according to claim 1 based on dc power transformation, which is characterized in that institute
It states and is also associated with filter capacitor Cin between two input terminals of DC-DC current transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721900367.4U CN208079018U (en) | 2017-12-29 | 2017-12-29 | A kind of photovoltaic module degradation detecting device based on dc power transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721900367.4U CN208079018U (en) | 2017-12-29 | 2017-12-29 | A kind of photovoltaic module degradation detecting device based on dc power transformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208079018U true CN208079018U (en) | 2018-11-09 |
Family
ID=64034460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721900367.4U Active CN208079018U (en) | 2017-12-29 | 2017-12-29 | A kind of photovoltaic module degradation detecting device based on dc power transformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208079018U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994868A (en) * | 2017-12-29 | 2018-05-04 | 西交利物浦大学 | A kind of photovoltaic module degradation detecting device and method based on dc power conversion |
| 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 |
-
2017
- 2017-12-29 CN CN201721900367.4U patent/CN208079018U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994868A (en) * | 2017-12-29 | 2018-05-04 | 西交利物浦大学 | A kind of photovoltaic module degradation detecting device and method based on dc power conversion |
| 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 |
| CN112910411B (en) * | 2021-01-25 | 2022-06-24 | 杭州易达光电有限公司 | Regionalized photovoltaic operation and maintenance management system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11031906B2 (en) | Current-voltage curve scan method for photovoltaic module, and optimizer | |
| CN102097854B (en) | Multi-power supply feed system and control method thereof | |
| CN102904444B (en) | DC/DC (direct-current/direct-current) conversion and control system based on proton exchange membrane fuel cell | |
| CN102163871B (en) | Multi-power supply system and method | |
| CN104330746B (en) | Energy-saving ageing testing device of inverter | |
| CN106712527B (en) | Isolated photovoltaic array simulator system based on calculation method | |
| CN208079018U (en) | A kind of photovoltaic module degradation detecting device based on dc power transformation | |
| CN102013853B (en) | Solar control system capable of providing direct-current power supply and control method thereof | |
| CN102868311B (en) | Inverter input-stage circuit with wide voltage input range and inverter | |
| CN104953945A (en) | High-efficiency photovoltaic power generation system and method | |
| CN203761633U (en) | Energy-saving LED traffic light with long service life | |
| CN107994868A (en) | A kind of photovoltaic module degradation detecting device and method based on dc power conversion | |
| CN208112509U (en) | A kind of twin-stage input step-up DC constant voltage output converter | |
| CN201898365U (en) | Energy supply system for multiple power supplies | |
| CN104735845A (en) | Efficient 60-W LED driving power source | |
| CN102983788A (en) | Self-coordination photovoltaic component optimizer | |
| CN103369769A (en) | LED fly-back constant current driving circuit | |
| CN108377099B (en) | Two-stage input boost DC constant voltage output converter | |
| CN108365761B (en) | DC constant voltage output converter | |
| CN204497972U (en) | A kind of novel retention time circuit structure | |
| CN108377098B (en) | Constant voltage output circuit of two-stage input inverter power supply | |
| US11626834B2 (en) | Power backfeed control method, converter, and photovoltaic power generation system | |
| CN207782754U (en) | A kind of photovoltaic module degradation detecting device based on power difference transformation | |
| CN201393179Y (en) | Photovoltaic off-grid inverter | |
| CN204168143U (en) | high-frequency isolation type photovoltaic controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |