CN112019158A - Outdoor life evaluation method and device for photovoltaic module - Google Patents
Outdoor life evaluation method and device for photovoltaic module Download PDFInfo
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- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
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Abstract
The invention discloses an outdoor life evaluation method and device of a photovoltaic module, wherein the method comprises the following steps: solving a pre-constructed component life model according to an indoor humidity freezing test
The model parameters in (1): eaα and n; solving an outdoor acceleration factor relative to an indoor acceleration factor according to a component service life model, model parameters, the target area of the photovoltaic component applied outdoors and preset indoor component internal humidity, component maximum temperature and component temperature difference; and solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module, so as to evaluate the outdoor life of the photovoltaic module. By the scheme provided by the invention, the service life of the photovoltaic module in the outdoor wet and cold environment of the target area can be evaluatedWhether the application requirements are met is met, and support is provided for reliability judgment of the photovoltaic module.
Description
Technical Field
The invention relates to the technical field of photovoltaic, in particular to an outdoor life evaluation method and device for a photovoltaic module.
Background
At present, for the detection and authentication standard of the photovoltaic industry, IEC61215 or IEC 61730 and UL1703 test standards and the like are used. In order to determine the capability of the photovoltaic module to bear a long-term wet freezing environment, a conventional indoor wet freezing accelerated aging test is generally performed according to the requirements of IEC61215, and the photovoltaic module to be detected is placed into a wet freezing environment test box and subjected to a wet freezing test under preset test conditions. For example, for a cigs thin film assembly, the set test conditions are typically: lowest temperature of test chamber: -45 ℃, maximum temperature of test chamber: at 85 ℃, the subzero temperature change rate is not higher than 200 ℃/h, the highest temperature and the lowest temperature are within +/-2 ℃ of the set value, the relative humidity is kept within +/-5% of 85%, the cycle period of the test is 24 hours, the residence time of the highest temperature is not less than 20 hours, and the residence time of the lowest temperature is not less than 0.5 hour.
The existing wet freezing test method is generally suitable for quality test and certification of photovoltaic modules, however, outdoor environment is more complex than indoor test environment, the service life of the photovoltaic modules in the outdoor wet freezing environment cannot be accurately judged according to the test results of the existing wet freezing test, and the test results cannot be used for judging the reliability of the modules.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an outdoor service life evaluation method and device for a photovoltaic module, which can evaluate the service life of the photovoltaic module in an outdoor wet and cold environment and provide support for reliability judgment of the photovoltaic module.
According to an aspect of the present invention, an embodiment of the present invention provides an outdoor life evaluation method of a photovoltaic module, including:
solving model parameters in a pre-constructed component life model according to an indoor wet freezing test, wherein the component life model is as follows:
n is failure cycle number, RH is the internal humidity of the assembly, and T is the maximum temperature of the assemblyDegree, Δ T is the component temperature difference, A is the pre-exponential factor, k is the Boltzmann constant, Eaα and n are model parameters associated with the photovoltaic module;
according to the component service life model, the model parameters, the target area of the photovoltaic component applied outdoors and the preset indoor component internal humidity, the component maximum temperature and the component temperature difference, solving an outdoor acceleration factor relative to an indoor acceleration factor;
and solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module, so as to evaluate the outdoor life of the photovoltaic module.
According to another aspect of the present invention, an embodiment of the present invention provides an outdoor life evaluation device of a photovoltaic module, including:
the model parameter solving module is used for solving model parameters in a pre-constructed component life model according to an indoor wet freezing test, wherein the component life model is as follows:
n is failure cycle number, RH is internal humidity of the assembly, T is maximum temperature of the assembly, delta T is temperature difference of the assembly, A is pre-exponential factor, k is Boltzmann constant, Eaα and n are model parameters associated with the photovoltaic module;
the acceleration factor solving module is used for solving an outdoor acceleration factor relative to an indoor acceleration factor according to the component service life model, the model parameters, the target area of the photovoltaic component applied outdoors and the preset indoor component internal humidity, the component maximum temperature and the component temperature difference;
and the outdoor life evaluation module is used for solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module so as to evaluate the outdoor life of the photovoltaic module.
The invention provides an outdoor service life evaluation method and device of a photovoltaic module, which are characterized in that a module service life model suitable for calculating the service life of the module in a wet freezing environment is constructed in advance; solving model parameters in a pre-constructed component life model according to an indoor wet freezing test; and then, according to the module service life model, the model parameters, the indoor module internal humidity, the module maximum temperature and the module temperature difference of the photovoltaic module in the target area of outdoor application and the preset room, solving an outdoor acceleration factor relative to the indoor acceleration factor. Therefore, after the indoor failure cycle times are obtained through an indoor wet freezing test, the outdoor failure cycle times of the photovoltaic module applied to the target area can be evaluated according to the acceleration factor and the indoor failure cycle times, so that the outdoor service life of the photovoltaic module applied to the target area is evaluated, whether the service life of the photovoltaic module meets the application requirement in the outdoor wet freezing environment of the target area is judged, and support is provided for reliability judgment of the photovoltaic module.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic flow chart of an outdoor life evaluation method for a photovoltaic module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an outdoor life evaluation device for a photovoltaic module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a model parameter solving module according to an embodiment of the present invention;
FIG. 4 is a block diagram of an acceleration factor solving module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1, an embodiment of the present invention provides an outdoor life evaluation method of a photovoltaic module, which may include the steps of:
s110: and solving model parameters in the pre-constructed component service life model according to the indoor wet freezing test.
In the embodiment of the invention, a component life model suitable for calculating the component life in a wet freezing environment is constructed in advance:
wherein N is failure cycle number, RH is internal humidity of the assembly, T is maximum temperature of the assembly, Δ T is temperature difference of the assembly, A is pre-exponential factor, k is Boltzmann constant, EaAnd α and n are model parameters associated with the photovoltaic module.
It can be understood that the component life model constructed by the embodiment of the invention is suitable for calculating the life of the component in the indoor wet and cold environment and is also suitable for calculating the life of the component in the outdoor wet and cold environment.
In the examples of the present invention, Eaα and n are model parameters associated with the photovoltaic module, mainly with the material properties of the photovoltaic module, in the case of a determination of the photovoltaic module to be evaluated, the model parameters EaAlpha and n are relatively fixed. Therefore, for practical application of the component life model, it is necessary toAnd solving model parameters related to the material characteristics of the photovoltaic module in the module service life model.
In practice, the model parameters EaThe consumption capacity of the precipitated fault is characterized and can be called as activation energy; the model parameter α mainly characterizes the material factor; the model parameter n mainly characterizes the humidity index.
In the embodiment of the invention, a plurality of groups of different environmental test boxes can be arranged, and the environmental test boxes are based on the model parameter E in the component life modelaAnd respectively setting a plurality of different environmental test boxes aiming at each model parameter so as to solve the model parameter through the test conditions and the test results of the different environmental test boxes.
In some embodiments of the present invention, different environmental test chambers correspond to different laboratory test conditions, which include three factors: component internal humidity, component maximum temperature, and component temperature differential. In practical application, a component temperature range is usually given, and the component temperature range comprises a component maximum temperature and a component minimum temperature; the component temperature difference may be calculated from the component temperature range.
In some embodiments of the present invention, in order to solve the three model parameters, a plurality of indoor test conditions corresponding to the factors may be constructed for the factors corresponding to each of the three model parameters. Wherein the model parameter corresponding to the humidity inside the component is n, and the model parameter corresponding to the highest temperature of the component is EaAnd the model parameter corresponding to the component temperature difference is alpha.
In the embodiment of the invention, aiming at each factor, at least two indoor test conditions corresponding to the factor meet the following conditions: the at least two laboratory test conditions differ in value for the one factor and are the same in value for the other two factors other than the one factor. For example, in order to solve the model parameter n, two indoor test conditions are set for the internal humidity of the component, and the values of the two indoor test conditions on the maximum temperature of the component and the temperature difference of the component are the same, but the values on the internal humidity of the component are different, as shown in table 1.
TABLE 1
In the embodiment of the invention, aiming at each model parameter, the model parameter is solved according to at least two indoor test conditions and test results corresponding to the factors corresponding to the model parameter and the constructed component life model. The test result is the cycle number of the power ratio reaching the set failure threshold value, namely the indoor failure cycle number.
It is understood that the failure threshold is set by those skilled in the art according to actual requirements, for example, the power ratio of the maximum power after attenuation to the initial maximum power reaches 90%, and it can be determined that the photovoltaic module is failed.
S120: and solving an outdoor acceleration factor relative to an indoor acceleration factor according to the module life model, the model parameters, the target area of the outdoor application of the photovoltaic module, and the preset indoor module internal humidity, the preset module highest temperature and the preset module temperature difference.
The influence on the service life of the photovoltaic module is different when the meteorological environment of different regions is considered, so that the outdoor acceleration factors corresponding to the regions can be solved relative to the indoor acceleration factors for the different regions in which the photovoltaic module is applied outdoors.
In the embodiment of the invention, an outdoor acceleration factor calculation model relative to an indoor acceleration factor calculation model can be constructed according to the component service life model and the model parameters:
wherein AF is an acceleration factor, RH, outdoors versus indoorsuHumidity, Δ T, inside the module outdoorsuIs the temperature difference of the outdoor component, TuMaximum temperature of the module, RH, outdoorstIs the humidity, delta T, inside the indoor assemblytIs the temperature difference of the indoor components, TtIs the highest temperature of the components in the room.
In practical application, an outdoor component life model can be constructed according to the component life model and the model parameters:
and component indoor life model
Then, an acceleration factor calculation model of outdoor versus indoor is constructed according to the component outdoor model and the component indoor life model, wherein,
as can be seen from the above acceleration factor calculation model for outdoor versus indoor, in order to solve the acceleration factor AF for outdoor versus indoor, it is necessary to obtain the humidity inside the component, the temperature difference between the components, and the maximum temperature between the components, and the humidity inside the component, the temperature difference between the components, and the maximum temperature between the components.
In the embodiment of the invention, the indoor humidity, the indoor highest temperature and the indoor temperature difference of the components can be preset by a person skilled in the art according to requirements. For example, the indoor cycling frequency, the indoor module maximum temperature, and the indoor module temperature difference may be set according to IEC61215 test requirements for photovoltaic modules.
In the embodiment of the invention, the internal humidity of the component, the highest temperature of the component and the temperature difference of the component corresponding to the target area of the outdoor application of the photovoltaic component can be obtained and used as the internal humidity of the outdoor component, the highest temperature of the component and the temperature difference of the component.
In practical application, the meteorological data of a target area of the photovoltaic module applied outdoors can be acquired for at least one year, and the meteorological data of the target area for at least one year and the solved model parameters are obtainedNumber EaAnd solving the equivalent highest temperature and the equivalent internal humidity of the assembly, and taking the highest temperature and the internal humidity of the assembly corresponding to the target area of the outdoor application of the photovoltaic assembly.
Specifically, the meteorological data acquired at each acquisition time point can be acquired according to the meteorological data of the target area for at least one year; for each acquisition time point, acquiring meteorological data and solved model parameters E according to the acquisition time pointaSolving equivalent component temperature corresponding to the acquisition time point; and screening out the component temperature with the highest value from the equivalent component temperatures corresponding to the acquisition time points as the equivalent highest component temperature. Screening out the component temperature with the lowest value in a circulation period corresponding to the outdoor circulation frequency as the equivalent component lowest temperature based on the time point corresponding to the highest temperature of the component and the preset outdoor circulation frequency; and calculating to obtain an equivalent component temperature difference according to the equivalent component maximum temperature and the equivalent component minimum temperature. According to the humidity data in the meteorological data of the target area for at least one year and the solved model parameters EaAnd solving equivalent internal humidity of the assembly. It is understood that the solution of the equivalent component temperature and the component internal humidity can be performed by the means commonly used by those skilled in the art, and will not be described in detail herein.
In practical applications, in order to improve the accuracy of the solution result, the equivalent maximum temperature of the component and the equivalent internal humidity of the component may be solved according to the TMY (Typical Meteorological Year) data of the target area.
In the embodiment of the invention, the outdoor acceleration factor relative to the indoor acceleration factor is calculated according to the acquired outdoor component internal humidity, the component maximum temperature and the component temperature difference, the preset indoor component internal humidity, the preset indoor component maximum temperature and the preset indoor component temperature difference and the acceleration factor calculation model.
S130: and solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module, so as to evaluate the outdoor life of the photovoltaic module.
In the embodiment of the invention, in order to solve the outdoor failure cycle number of the photovoltaic module, a humidity freezing test can be firstly carried out according to the preset indoor module internal humidity, the module maximum temperature and the module temperature difference to obtain the indoor failure cycle number of the photovoltaic module; taking the product of the indoor failure cycle number of the photovoltaic module and the acceleration factor of the outdoor relative indoor as the outdoor failure cycle number of the photovoltaic module; and calculating the outdoor service life of the photovoltaic module according to the outdoor failure cycle times and a preset outdoor cycle frequency. In practical application, the process of the wet freezing test is carried out according to a preset indoor circulation frequency. In order to avoid the influence of the cycle frequency on the life calculation, in the embodiment of the present invention, the cycle frequency in the indoor space is consistent with the cycle frequency in the outdoor space, and may be 24h, for example.
In the embodiment of the invention, the indoor failure cycle number of the photovoltaic module can be obtained by the following method:
setting an indoor test condition of a wet freezing test box according to preset indoor component internal humidity, component maximum temperature and component temperature difference; and respectively placing one or more photovoltaic modules in the wet freezing test box, and performing wet freezing tests on the photovoltaic modules according to indoor test conditions.
In the process of carrying out a wet freezing test, obtaining the initial maximum power of the photovoltaic module; performing a wet freezing test according to a preset cycle frequency within a set time period, and performing an electrical performance test on the photovoltaic module according to a preset test frequency to obtain the maximum power of the photovoltaic module during testing; calculating the power ratio during testing according to the maximum power and the initial maximum power during testing of the photovoltaic module and correspondingly recording the testing time; and according to the recorded test time and the corresponding power ratio, fitting to obtain the failure test time when the power ratio reaches a set failure threshold, and according to the preset cycle frequency and the failure test time, calculating to obtain the cycle times when the power ratio reaches the failure threshold, and taking the cycle times as the indoor failure cycle times. Wherein the electrical property test can be performed by an IV tester.
In practical application, in order to improve the accuracy, a plurality of wet freezing test boxes can be arranged according to preset indoor component internal humidity, component maximum temperature and component temperature difference, a plurality of photovoltaic components are placed in the wet freezing test boxes with the same indoor test conditions, and the indoor failure cycle times of the photovoltaic components are calculated respectively; and (4) judging and eliminating abnormal values of the indoor failure cycle times of each photovoltaic module, and obtaining the indoor failure cycle times for solving the outdoor failure cycle times according to the indoor failure cycle times of the rest photovoltaic modules. For example, the average or minimum of the indoor failure cycle numbers of the remaining photovoltaic modules is used as the indoor failure cycle number for solving the outdoor failure cycle number.
The invention provides an outdoor service life evaluation method of a photovoltaic module, which is characterized in that a module service life model suitable for calculating the service life of the module in a wet freezing environment is constructed in advance; solving model parameters in a pre-constructed component life model according to an indoor wet freezing test; and then, according to the module service life model, the model parameters, the indoor module internal humidity, the module maximum temperature and the module temperature difference of the photovoltaic module in the target area of outdoor application and the preset room, solving an outdoor acceleration factor relative to the indoor acceleration factor. Therefore, after the indoor failure cycle times are obtained through an indoor wet freezing test, the outdoor failure cycle times of the photovoltaic module applied to the target area can be evaluated according to the acceleration factor and the indoor failure cycle times, so that the outdoor service life of the photovoltaic module applied to the target area is evaluated, whether the service life of the photovoltaic module meets the application requirement in the outdoor wet freezing environment of the target area is judged, and support is provided for reliability judgment of the photovoltaic module.
In some embodiments of the present invention, in the process of obtaining the indoor failure cycle number of the photovoltaic module under various indoor test conditions through testing, the indoor failure cycle number of the photovoltaic module under the indoor test conditions can be obtained according to the following manner for each indoor test condition by referring to the above method.
Specifically, aiming at each indoor test condition, acquiring the initial maximum power of one or more photovoltaic modules corresponding to the indoor test condition; performing a wet freezing test according to a preset cycle frequency within a set time period, and performing an electrical performance test on the photovoltaic module under an indoor test condition according to a preset test frequency to obtain the maximum power of the photovoltaic module during testing; calculating the power ratio during testing according to the maximum power and the initial maximum power during testing of the photovoltaic module and correspondingly recording the testing time; and according to the recorded test time and the corresponding power ratio, fitting to obtain the failure test time when the power ratio reaches a set failure threshold, and according to the preset cycle frequency and the failure test time, calculating to obtain the indoor failure cycle times when the power ratio reaches the failure threshold.
Based on the above embodiment, an embodiment of the present invention further provides an outdoor life evaluation apparatus for a photovoltaic module, as shown in fig. 2, which may include: a model parameter solving module 201, an acceleration factor solving module 202 and an outdoor life evaluation module 203.
The model parameter solving module 201 is configured to solve model parameters in a pre-constructed component life model according to an indoor humidity freezing test, where the component life model is:
n is failure cycle number, RH is internal humidity of the assembly, T is maximum temperature of the assembly, delta T is temperature difference of the assembly, A is pre-exponential factor, k is Boltzmann constant, EaAnd α and n are model parameters associated with the photovoltaic module.
The acceleration factor solving module 202 is configured to solve an outdoor acceleration factor relative to an indoor acceleration factor according to the component life model, the model parameters, a target area of the photovoltaic component in outdoor application, and a preset indoor component internal humidity, a preset component maximum temperature, and a preset component temperature difference.
The outdoor life evaluation module 203 is configured to solve the outdoor failure cycle number of the photovoltaic module according to the outdoor-to-indoor acceleration factor and the indoor failure cycle number of the photovoltaic module, so as to evaluate the outdoor life of the photovoltaic module.
As shown in FIG. 3, in some embodiments of the invention, the model parameter solution module 201 may include: an indoor test unit 301 and a parameter solving unit 302.
The indoor testing unit 301 is used for obtaining indoor failure cycle times of the photovoltaic module under various indoor testing conditions through testing; wherein, the indoor test condition comprises three factors: the humidity inside the module, the maximum temperature of the module and the temperature difference of the module are all constructed, and each factor is provided with at least two corresponding indoor test conditions.
The parameter solving unit 302 is configured to, for each factor, fit and solve a model parameter corresponding to the factor according to the failure cycle number of the photovoltaic module under at least two indoor test conditions corresponding to the factor, the module internal humidity, the module maximum temperature, and the module temperature difference in the indoor test conditions, and the module life model.
Aiming at each factor, at least two indoor test conditions corresponding to the factor meet the following conditions: the values of the at least two indoor test conditions are different on the factor, and the values of the at least two indoor test conditions on the other two factors except the factor are the same; the model parameter corresponding to the humidity inside the component is n, and the model parameter corresponding to the highest temperature of the component is EaAnd the model parameter corresponding to the component temperature difference is alpha.
Further, as shown in fig. 4, the acceleration factor solving module 202 may include: acceleration factor model construction unit 401, outdoor parameter acquisition unit 402, and acceleration factor calculation unit 403
The acceleration factor model building unit 401 is configured to build an outdoor acceleration factor calculation model relative to an indoor acceleration factor calculation model according to the component life model and the model parameters:
whereinAF is an acceleration factor, RH, outdoors versus indoorsuHumidity, Δ T, inside the module outdoorsuIs the temperature difference of the outdoor component, TuMaximum temperature of the module, RH, outdoorstIs the humidity, delta T, inside the indoor assemblytIs the temperature difference of the indoor components, TtIs the highest temperature of the components in the room.
The outdoor parameter obtaining unit 402 is configured to obtain an inside humidity of the component, a maximum temperature of the component, and a temperature difference of the component corresponding to a target area of the outdoor application of the photovoltaic component at a preset outdoor cycle frequency, and use the inside humidity of the component, the maximum temperature of the component, and the temperature difference of the component as the outside humidity of the component, the maximum temperature of the component, and the temperature difference of the component.
The acceleration factor calculation unit 403 is configured to calculate an outdoor acceleration factor relative to an indoor acceleration factor according to the obtained outdoor component internal humidity, the obtained outdoor component maximum temperature, and the obtained component temperature difference, the preset indoor component internal humidity, the preset indoor component maximum temperature, and the obtained component temperature difference, and the obtained acceleration factor calculation model.
It can be understood that, for the specific functional implementation of each module in the outdoor life evaluation apparatus for a photovoltaic module and each unit in each module provided in the embodiments of the present invention, reference may be made to the specific implementation of each step in the outdoor life evaluation method for a photovoltaic module described above, and details are not described here.
According to the outdoor service life evaluation device of the photovoltaic module, provided by the embodiment of the invention, a module service life model suitable for calculating the service life of the module in a wet freezing environment is constructed in advance; solving model parameters in a pre-constructed component life model according to an indoor wet freezing test; then, according to the component life model, the model parameters, the internal humidity of the photovoltaic component in the target area of outdoor application and the indoor component, the highest temperature of the component and the temperature difference of the component, the acceleration factor of the outdoor relative to the indoor is solved. Therefore, after the indoor failure cycle times are obtained through an indoor wet freezing test, the outdoor failure cycle times of the photovoltaic module applied to the target area can be evaluated according to the acceleration factor and the indoor failure cycle times, so that the outdoor service life of the photovoltaic module applied to the target area is evaluated, whether the service life of the photovoltaic module meets the application requirement in the outdoor wet freezing environment of the target area is judged, and support is provided for reliability judgment of the photovoltaic module.
An embodiment of the present invention further provides an electronic device, please refer to fig. 5, fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device may include: at least one processor 510, such as a CPU (Central Processing Unit), at least one communication interface 530, memory 540, and at least one communication bus 520. Wherein a communication bus 520 is used to enable the connection communication between these components. The communication interface 530 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 530 may further include a standard wired interface and a standard wireless interface. The Memory 540 may be a high-speed RAM (Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 540 may optionally be at least one memory device located remotely from the processor 510. Wherein the memory 540 stores an application program therein and the processor 510 invokes the program code stored in the memory 540 for performing the above-described outdoor lifetime assessment method steps of the photovoltaic module shown in fig. 1.
The communication bus 520 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 520 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
The memory 540 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); memory 540 may also include combinations of the above types of memory.
The processor 510 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 510 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, memory 540 is also used to store program instructions. The processor 410 may invoke program instructions to implement the method for outdoor life assessment of photovoltaic modules as illustrated in fig. 1 herein.
The embodiment of the invention also provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the outdoor life evaluation method of the photovoltaic module in any method embodiment. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It is to be understood that the use of "first," "second," and similar terms in the description of the invention are not intended to imply any order, quantity, or importance, but rather are used to distinguish one element from another.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An outdoor life evaluation method of a photovoltaic module, comprising:
solving model parameters in a pre-constructed component life model according to an indoor wet freezing test, wherein the component life model is as follows:
n is failure cycle number, RH is internal humidity of the assembly, T is maximum temperature of the assembly, delta T is temperature difference of the assembly, A is pre-exponential factor, k is Boltzmann constant, Eaα and n are model parameters associated with the photovoltaic module;
according to the component service life model, the model parameters, the target area of the photovoltaic component applied outdoors and the preset indoor component internal humidity, the component maximum temperature and the component temperature difference, solving an outdoor acceleration factor relative to an indoor acceleration factor;
and solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module, so as to evaluate the outdoor life of the photovoltaic module.
2. The method for evaluating the outdoor life of the photovoltaic module according to claim 1, wherein solving model parameters in a pre-constructed module life model according to an indoor wet freezing test comprises:
testing to obtain indoor failure cycle times of the photovoltaic module under various indoor test conditions; wherein, the indoor test condition comprises three factors: the method comprises the following steps that (1) the internal humidity of a component, the highest temperature of the component and the temperature difference of the component are established, and at least two corresponding indoor test conditions are established for each factor;
for each factor, according to the indoor failure cycle times of the photovoltaic module under at least two indoor test conditions corresponding to the factor, the internal humidity of the module, the highest temperature of the module and the temperature difference of the module in the indoor test conditions, and the service life model of the module, fitting and solving model parameters corresponding to the factor;
aiming at each factor, at least two indoor test conditions corresponding to the factor meet the following conditions: the values of the at least two indoor test conditions are different on the factor, and the values of the at least two indoor test conditions on the other two factors except the factor are the same; the model parameter corresponding to the humidity inside the component is n, and the model parameter corresponding to the highest temperature of the component is EaAnd the model parameter corresponding to the component temperature difference is alpha.
3. The method for evaluating the outdoor life of the photovoltaic module according to claim 2, wherein the test is used for obtaining the indoor failure cycle number of the photovoltaic module under various indoor test conditions, and comprises the following steps:
aiming at each indoor test condition, obtaining the indoor failure cycle times of the photovoltaic module under the indoor test condition according to the following mode:
acquiring initial maximum power of one or more photovoltaic modules corresponding to the indoor test conditions;
performing a wet freezing test according to a preset cycle frequency within a set time period, and performing an electrical performance test on the photovoltaic module under an indoor test condition according to a preset test frequency to obtain the maximum power of the photovoltaic module during testing; calculating the power ratio during testing according to the maximum power and the initial maximum power during testing of the photovoltaic module and correspondingly recording the testing time;
and according to the recorded test time and the corresponding power ratio, fitting to obtain the failure test time when the power ratio reaches a set failure threshold, and according to the preset cycle frequency and the failure test time, calculating to obtain the indoor failure cycle times when the power ratio reaches the failure threshold.
4. The method for estimating outdoor lifetime of a photovoltaic module according to claim 1, wherein said solving for an acceleration factor outdoors versus indoors comprises:
according to the component service life model and the model parameters, constructing an acceleration factor calculation model of outdoor versus indoor:
wherein AF is an acceleration factor, RH, outdoors versus indoorsuHumidity, Δ T, inside the module outdoorsuIs the temperature difference of the outdoor component, TuMaximum temperature of the module, RH, outdoorstIs the humidity, delta T, inside the indoor assemblytIs the temperature difference of the indoor components, TtIs the highest temperature of the components in the room;
acquiring the internal humidity of the component, the highest temperature of the component and the temperature difference of the component corresponding to a target area of outdoor application of the photovoltaic component, and taking the internal humidity of the component, the highest temperature of the component and the temperature difference of the component as the outdoor internal humidity of the component, the highest temperature of the component and the temperature difference of the component;
and calculating to obtain an outdoor acceleration factor relative to an indoor acceleration factor according to the obtained outdoor component internal humidity, the obtained component maximum temperature and the obtained component temperature difference, the preset indoor component internal humidity, the preset component maximum temperature and the preset component temperature difference and the acceleration factor calculation model.
5. The method for estimating outdoor life of a photovoltaic module according to claim 4, wherein the constructing an acceleration factor calculation model of outdoor versus indoor comprises:
constructing an outdoor service life model of the component according to the service life model of the component and the model parameters:
and component indoor life model
Constructing an acceleration factor calculation model for outdoor versus indoor according to the component outdoor model and the component indoor lifetime model, wherein,
6. the method for evaluating the outdoor life of a photovoltaic module according to claim 4, wherein the module internal humidity, the module maximum temperature and the module temperature difference corresponding to the target area of the photovoltaic module outdoor application are obtained according to the following method:
according to the meteorological data of the target area for at least one year and solved model parameters EaSolving the equivalent highest temperature and the equivalent internal humidity of the assembly, and taking the highest temperature and the internal humidity of the assembly corresponding to a target area for outdoor application of the photovoltaic assembly;
and extracting the lowest temperature of the component in a circulation period corresponding to the preset outdoor circulation frequency according to the acquisition time point corresponding to the highest temperature of the component to obtain the temperature difference of the component corresponding to the highest temperature of the component.
7. The method for evaluating the outdoor life of the photovoltaic module according to any one of claims 1 to 6, wherein the step of solving the outdoor failure cycle number of the photovoltaic module according to the acceleration factor and the indoor failure cycle number of the photovoltaic module to evaluate the outdoor life of the photovoltaic module comprises the following steps:
performing a humidity freezing test according to the preset indoor module internal humidity, the preset indoor module maximum temperature and the preset module temperature difference to obtain the indoor failure cycle times of the photovoltaic module;
taking the product of the indoor failure cycle number of the photovoltaic module and the acceleration factor of the outdoor relative indoor as the outdoor failure cycle number of the photovoltaic module;
and calculating the outdoor service life of the photovoltaic module according to the outdoor failure cycle times and a preset outdoor cycle frequency.
8. An outdoor life evaluation device for a photovoltaic module, comprising:
the model parameter solving module is used for solving model parameters in a pre-constructed component life model according to an indoor wet freezing test, wherein the component life model is as follows:
n is failure cycle number, RH is internal humidity of the assembly, T is maximum temperature of the assembly, delta T is temperature difference of the assembly, A is pre-exponential factor, k is Boltzmann constant, Eaα and n are model parameters associated with the photovoltaic module;
the acceleration factor solving module is used for solving an outdoor acceleration factor relative to an indoor acceleration factor according to the component service life model, the model parameters, the target area of the photovoltaic component applied outdoors and the preset indoor component internal humidity, the component maximum temperature and the component temperature difference;
and the outdoor life evaluation module is used for solving the outdoor failure cycle times of the photovoltaic module according to the outdoor acceleration factor relative to the indoor acceleration factor and the indoor failure cycle times of the photovoltaic module so as to evaluate the outdoor life of the photovoltaic module.
9. The outdoor life evaluation device of a photovoltaic module of claim 8, wherein the model parameter solving module comprises:
indoor test unit for
Testing to obtain indoor failure cycle times of the photovoltaic module under various indoor test conditions; wherein, the indoor test condition comprises three factors: the method comprises the following steps that (1) the internal humidity of a component, the highest temperature of the component and the temperature difference of the component are established, and at least two corresponding indoor test conditions are established for each factor;
the parameter solving unit is used for solving model parameters corresponding to each factor in a fitting manner according to the indoor failure cycle times of the photovoltaic module under at least two indoor test conditions corresponding to the factor, the internal humidity of the module, the highest temperature of the module and the temperature difference of the module in the indoor test conditions and the service life model of the module;
aiming at each factor, at least two indoor test conditions corresponding to the factor meet the following conditions: the values of the at least two indoor test conditions are different on the factor, and the values of the at least two indoor test conditions on the other two factors except the factor are the same; the model parameter corresponding to the humidity inside the component is n, and the model parameter corresponding to the highest temperature of the component is EaAnd the model parameter corresponding to the component temperature difference is alpha.
10. The outdoor life evaluation device of a photovoltaic module of claim 8, wherein the acceleration factor solving module comprises:
the acceleration factor model building unit is used for building an outdoor acceleration factor calculation model relative to an indoor acceleration factor calculation model according to the component service life model and the model parameters:
wherein AF is an acceleration factor, RH, outdoors versus indoorsuHumidity, Δ T, inside the module outdoorsuIs the temperature difference of the outdoor component, TuMaximum temperature of the module, RH, outdoorstIs the humidity, delta T, inside the indoor assemblytIs the temperature difference of the indoor components, TtIs the highest temperature of the components in the room;
the photovoltaic module outdoor application control system comprises an outdoor parameter acquisition unit, a photovoltaic module control unit and a control unit, wherein the outdoor parameter acquisition unit is used for acquiring the internal humidity of the photovoltaic module, the highest temperature of the photovoltaic module and the temperature difference of the photovoltaic module corresponding to a target area of outdoor application of the photovoltaic module under a preset outdoor cycle frequency and taking the internal humidity of the photovoltaic module, the highest temperature of the photovoltaic module and the temperature difference of the photovoltaic module as the;
and the acceleration factor calculation unit is used for calculating and obtaining an outdoor acceleration factor relative to an indoor acceleration factor according to the obtained outdoor component internal humidity, the obtained outdoor component maximum temperature and the obtained component temperature difference, the preset indoor component internal humidity, the preset indoor component maximum temperature and the obtained component temperature difference, and the obtained acceleration factor calculation model.
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