CN115333469A - Photovoltaic module cleaning method and device - Google Patents
Photovoltaic module cleaning method and device Download PDFInfo
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- CN115333469A CN115333469A CN202210863492.1A CN202210863492A CN115333469A CN 115333469 A CN115333469 A CN 115333469A CN 202210863492 A CN202210863492 A CN 202210863492A CN 115333469 A CN115333469 A CN 115333469A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000012544 monitoring process Methods 0.000 claims abstract description 146
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 238000012549 training Methods 0.000 claims description 6
- YHXISWVBGDMDLQ-UHFFFAOYSA-N moclobemide Chemical compound C1=CC(Cl)=CC=C1C(=O)NCCN1CCOCC1 YHXISWVBGDMDLQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 description 31
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/10—Cleaning arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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 photovoltaic module cleaning method and device. The photovoltaic module cleaning method comprises the following steps: acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power; acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning; converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power; and judging whether the first power and the second power meet a preset cleaning condition, and if so, cleaning the target photovoltaic module. Therefore, the photovoltaic module dust can be cleaned in time, loss caused by improper cleaning of the photovoltaic module is avoided, and the best effect of cleaning yield of the photovoltaic module is achieved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module cleaning method and device.
Background
Photovoltaic power generation converts light into electricity through a photovoltaic module. However, when dust exists on the photovoltaic module, the penetration of light to the module is influenced, and further, the power generation is influenced, so that the dust on the module needs to be cleaned. However, cleaning the components is also costly, which can seriously affect the photovoltaic power generation if the cleaning is not timely or less frequent, and can undoubtedly increase the cleaning cost if the cleaning is frequent for a number of times in order to ensure cleaning of the components. The existing cleaning method mainly comprises the following steps: and judging whether the cleaning is reasonable or not according to a direct dust collection method. Or comparing the electrical parameters of the assembly which is not cleaned by cleaning or comparing the electrical parameters of the assembly before and after cleaning. However, these methods have the following disadvantages: whether the cleaning is unreasonable is judged according to the direct dust collection method, and the power is influenced by other factors due to the fact that the dust and the power are not in a linear relation, so that the problem of inaccurate detection is caused according to the direct dust collection judgment method. In addition, through the electric parameter comparison of the assembly which is not cleaned during cleaning or the electric parameter comparison before and after the double-sided assembly is cleaned, the problem of inaccurate detection is easily caused by special weather or single error and the like.
Disclosure of Invention
The invention provides a photovoltaic module cleaning method and device, which are used for determining when dust of a photovoltaic module is cleaned, improving the accuracy of cleaning detection and judgment, realizing timely cleaning, and avoiding the problems that the photovoltaic power generation is influenced due to untimely cleaning of the module, the cleaning cost is increased due to too many cleaning times and the like.
According to an aspect of the present invention, there is provided a photovoltaic module cleaning method including:
acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power;
acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning;
converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power;
and judging whether the first power and the second power meet preset cleaning conditions, and if so, cleaning the target photovoltaic module.
Optionally, the obtaining measured power data of the target photovoltaic module after the historical cleaning, and determining the predicted power of the target photovoltaic module under the standard parameter condition according to the measured power data after the historical cleaning includes:
obtaining historical monitoring power of the target photovoltaic module after each cleaning when the monitoring irradiation reaches the preset irradiation;
respectively converting each historical monitoring power into theoretical power corresponding to the target photovoltaic module under each standard parameter condition;
and performing iterative training by adopting a time sequence prediction method based on the theoretical power corresponding to the target photovoltaic module under each standard parameter condition to obtain the predicted power of the target photovoltaic module under the standard parameter condition.
Optionally, the converting each historical monitoring power into a theoretical power corresponding to the target photovoltaic module under the standard parameter condition includes:
and converting the historical monitoring power into corresponding theoretical power of the target photovoltaic module under each standard parameter condition according to standard parameter conditions, historical monitoring power and a power influence coefficient of temperature.
Optionally, the time series prediction method comprises at least one or more of naive prediction method, moving average method, weighted moving average method and ARIMA.
Optionally, the standard parameter condition is: standard irradiation and standard temperature conditions.
Optionally, the converting the predicted power of the target photovoltaic module under the standard parameter condition into a corresponding predicted power at the monitored temperature, and recording as the second power includes:
and converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power of the target photovoltaic module under the monitoring temperature according to the standard parameter condition, the predicted power of the target photovoltaic module under the standard parameter condition and the power influence coefficient of the temperature to the power, and recording as a second power.
Optionally, the determining whether the first power and the second power meet a preset cleaning condition, and if so, cleaning the target photovoltaic module includes:
and judging whether the difference value of the first power and the second power is larger than a preset difference value or not, and cleaning the target photovoltaic module if the difference value of the first power and the second power is larger than the preset difference value.
Optionally, the preset irradiation is a standard irradiation.
Optionally, after cleaning the photovoltaic module, the method further comprises:
acquiring monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation in real time;
and converting the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation into theoretical power under the condition of standard parameters, and storing the theoretical power in a historical database.
According to another aspect of the present invention, there is provided a photovoltaic module cleaning apparatus including:
the monitoring temperature acquisition module is used for acquiring the monitoring temperature corresponding to the target photovoltaic module when the monitoring irradiation reaches the preset irradiation;
the first power acquisition module is used for acquiring monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches the preset irradiation, and recording the monitoring power as first power;
the historical measured power data acquisition module is used for acquiring measured power data of the target photovoltaic module after historical cleaning;
the predicted power determining module is used for determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actually measured power data after the historical cleaning;
the second power determining module is used for converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power;
and the judging module is used for judging whether the first power and the second power meet preset cleaning conditions or not, and cleaning the target photovoltaic module if the first power and the second power meet the preset cleaning conditions.
According to the technical scheme of the embodiment of the invention, the photovoltaic module cleaning method and the device are provided, and the photovoltaic module cleaning method comprises the following steps: acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power; acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning; converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power; and judging whether the first power and the second power meet preset cleaning conditions, and if so, cleaning the target photovoltaic module. Therefore, measured power data of the target photovoltaic module after historical cleaning is converted into predicted power under the condition of standard parameters and then converted into predicted power under the condition of monitoring temperature, namely second power, the second power is compared with the actually measured monitored power (namely first power) of the target photovoltaic module, whether the preset cleaning condition is met or not is judged, if yes, dust of the photovoltaic module exerts adverse influence on photovoltaic power generation, and the photovoltaic module needs to be cleaned. If the preset cleaning condition is not met, the situation that the dust of the photovoltaic module does not influence or has little influence on photovoltaic power generation at the moment is indicated, and the photovoltaic module does not need to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be timely cleaned, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased and the like is avoided, and the best cleaning benefit of the photovoltaic assembly is achieved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a method for cleaning a photovoltaic module provided in an embodiment of the present invention;
FIG. 2 is a flow chart of another photovoltaic module cleaning method provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a photovoltaic module cleaning apparatus provided in an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a photovoltaic module cleaning method provided in an embodiment of the present invention, and this embodiment may be applied to a photovoltaic system processing platform, and implement reasonable and timely cleaning of dust on a photovoltaic module, and avoid a loss caused by improper cleaning of the module. As shown in fig. 1, the method includes:
and S110, acquiring the corresponding monitoring temperature and monitoring power of the target photovoltaic module when the monitoring irradiation reaches the preset irradiation, and recording the monitoring power as a first power.
Because the power of photovoltaic module can be influenced to photovoltaic module dust, influence photovoltaic generated energy. In order to accurately judge whether the photovoltaic module needs to be cleaned in time, the actual power of the target photovoltaic module needs to be monitored. When the actual power of the target photovoltaic module is monitored, the power of the photovoltaic module can be influenced to a certain extent due to irradiation, the error of the monitoring value is large when the irradiation value is selected to be low, and the monitoring value cannot be easily reached when the irradiation value is high. Therefore, a preset irradiation value is preset, a monitored irradiation value is collected in real time, and when the irradiation value reaches the preset irradiation value, the monitored temperature and power of the target photovoltaic module are recorded.
In addition, the monitoring temperature and the power of the photovoltaic module are collected through preset irradiation, so that the monitoring deviation caused by special weather can be avoided, and the collected data is easy to obtain.
Optionally, the preset irradiation is a standard irradiation. The error of the monitoring value is larger when the lower irradiation value is selected, but the error is not easy to reach when the higher irradiation value is selected. Therefore, it is important to select the range of standard irradiation appropriately. Preferably, the monitoring error is small and easily achieved when the preset irradiation is the standard irradiation. Preferably, the value range of the standard irradiation can be 600-1000W/m 2 。
The value range and the specific value of the standard irradiation can be set according to the actual situation, and are not specifically limited herein.
S120, actual measurement power data of the target photovoltaic module after historical cleaning are obtained, and the predicted power of the target photovoltaic module under the standard parameter condition is determined according to the actual measurement power data after the historical cleaning.
The target photovoltaic module can monitor and store actual measurement power data after being cleaned every time. The actually measured power data of the target photovoltaic module after being cleaned each time is theoretical power of other influence factors which influence the power generation power of the photovoltaic module except dust factors. In other words, if the power measured by actual measurement of the photovoltaic module during a period of operation is greatly different from the power measured immediately after the photovoltaic module is cleaned, it is indicated that the factor causing the large difference between the theoretical power generation power and the actual power generation power of the photovoltaic module is the dust of the photovoltaic module.
The photovoltaic module is subjected to photoelectric conversion and is influenced by temperature, so that actually measured power data after historical cleaning cannot be directly used as theoretical power to be compared with subsequent second power. Therefore, the measured power data after the historical cleaning is converted into the predicted power of the target photovoltaic module under the condition of standard parameters.
Optionally, the standard parameter conditions are standard irradiation and standard temperature conditions.
And S130, converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitored temperature, and recording the predicted power as second power.
Because the photoelectric power conversion of the photovoltaic module can be influenced by the temperature, in order to ensure the accuracy and effectiveness of subsequent cleaning judgment and avoid the influence of the temperature on the judgment accuracy, the predicted power of the target photovoltaic module under the standard parameter condition is converted into the corresponding predicted power under the monitoring temperature, so that the influence conditions of the first power and the second power by the temperature are consistent.
The first power and the second power are respectively an actual measurement power value and a predicted power value corresponding to the target photovoltaic module under the same monitoring temperature and preset irradiation, and under the condition that the temperature and irradiation influence conditions are the same, whether the preset cleaning condition is met or not is judged according to the first power and the second power, so that the influence of temperature and irradiation factors on cleaning judgment can be eliminated.
And S140, judging whether the first power and the second power meet preset cleaning conditions, and cleaning the target photovoltaic module if the first power and the second power meet the preset cleaning conditions.
The actual measured power data of the target photovoltaic module after each cleaning is theoretical power capable of excluding other influence factors which influence the power generation power of the photovoltaic module except dust factors, the predicted power of the target photovoltaic module under the standard parameter condition is determined according to the actual measured power data after historical cleaning, and the corresponding predicted power, namely the second power, at the monitoring temperature is converted according to the predicted power of the target photovoltaic module under the standard parameter condition, so that the second power is theoretical power capable of excluding other influence factors which influence the power generation power of the photovoltaic module except dust factors. In other words, if the first power and the second power do not satisfy the preset cleaning condition, it indicates that dust on the photovoltaic module does not affect or has little effect on photovoltaic power generation, and the photovoltaic module does not need to be cleaned at this time. If the first power and the second power meet the preset cleaning condition, it is indicated that dust of the photovoltaic module has adverse effect on photovoltaic power generation, and the photovoltaic module needs to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be cleaned in time, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased, and the like is solved, and the best cleaning benefit of the photovoltaic assembly is achieved.
In the technical scheme of the embodiment, the working principle of the cleaning method for the photovoltaic module is as follows: referring to fig. 1, when the monitored irradiation reaches the preset irradiation, acquiring the monitored temperature and the monitored power corresponding to the target photovoltaic module, and recording the monitored power as a first power; acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning; converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power; and judging whether the first power and the second power meet preset cleaning conditions, and if so, cleaning the target photovoltaic module. Therefore, actual measurement power data of the target photovoltaic module after historical cleaning is converted into prediction power under a standard parameter condition and then converted into prediction power under a monitoring temperature, namely second power, the second power is compared with the actually measured monitoring power (namely first power) of the target photovoltaic module, whether the preset cleaning condition is met or not is judged, if yes, dust of the photovoltaic module adversely affects photovoltaic power generation, and the photovoltaic module needs to be cleaned. If the preset cleaning condition is not met, the situation that the dust of the photovoltaic module does not influence or has little influence on photovoltaic power generation at the moment is indicated, and the photovoltaic module does not need to be cleaned at the moment. From this, through monitoring temperature and power under the collection predetermines the irradiation, on the one hand the data acquisition obtains easily, and on the other hand gathers through the irradiation of setting for and calculates monitoring power, can avoid the deviation because of special weather leads to be favorable to improving data acquisition's accuracy, and then improve the accuracy that follow-up detection judged. And the predicted power, namely the second power, is obtained by conversion on the basis of the data after the historical cleaning, so that the error problem caused by single data acquisition contrast can be avoided, and the accuracy of detection and judgment is improved. In addition, compared with the mode that whether the cleaning is reasonable or not is judged by adopting a method for collecting direct deposited dust in the prior art, quantitative judgment can be realized through final first power and second power electrical parameter judgment, so that the judgment accuracy is improved, the dust of the photovoltaic module can be timely cleaned, the loss caused by improper cleaning of the photovoltaic module is avoided, the problems that the photovoltaic power generation amount is influenced due to untimely cleaning, the cleaning cost is excessively increased due to the cleaning times and the like are solved, and the best cleaning benefit effect of the photovoltaic module is realized.
According to the technical scheme of the embodiment, the photovoltaic module cleaning method comprises the following steps: acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power; acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning; converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power; and judging whether the first power and the second power meet preset cleaning conditions, and if so, cleaning the target photovoltaic module. Therefore, measured power data of the target photovoltaic module after historical cleaning is converted into predicted power under the condition of standard parameters and then converted into predicted power under the condition of monitoring temperature, namely second power, the second power is compared with the actually measured monitored power (namely first power) of the target photovoltaic module, whether the preset cleaning condition is met or not is judged, if yes, dust of the photovoltaic module exerts adverse influence on photovoltaic power generation, and the photovoltaic module needs to be cleaned. If the preset cleaning condition is not met, the situation that the dust of the photovoltaic module does not influence or has little influence on photovoltaic power generation at the moment is indicated, and the photovoltaic module does not need to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be cleaned in time, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased, and the like is solved, and the best cleaning benefit of the photovoltaic assembly is achieved.
Fig. 2 is a flow chart of another photovoltaic module cleaning method provided in the embodiment of the present invention. Referring to fig. 2, the method includes:
s210, when the monitored irradiation reaches the preset irradiation, acquiring the monitored temperature and the monitored power corresponding to the target photovoltaic module, and recording the monitored power as a first power.
S220, obtaining historical monitoring power of the target photovoltaic module after each cleaning when the monitoring irradiation reaches the preset irradiation.
The target photovoltaic module can monitor and store actual measurement power data after being cleaned every time, namely historical monitoring power when the monitoring irradiation reaches preset irradiation.
And S230, converting each historical monitoring power into corresponding theoretical power of the target photovoltaic module under each standard parameter condition.
Wherein, because photovoltaic module carries out photoelectric conversion and can receive the influence of temperature, consequently, the actual measurement power after target photovoltaic module washs at every turn can not directly be compared as theoretical power and second power. Therefore, each historical monitoring power is respectively converted into the theoretical power corresponding to the target photovoltaic module under each standard parameter condition.
Wherein the standard parameter conditions are standard irradiation and standard temperature conditions.
Optionally, the converting each historical monitoring power into a theoretical power corresponding to the target photovoltaic module under the standard parameter condition includes:
and converting the historical monitoring power into theoretical power corresponding to the target photovoltaic module under each standard parameter condition according to the standard parameter condition, the historical monitoring power and the influence coefficient of the temperature on the power.
The specific values of the temperature-to-power influence coefficient, the photovoltaic module type selection and the like can be set according to actual conditions, and are not specifically limited.
Illustratively, the monitoring temperature when the irradiation reaches the preset irradiation is set to C X Standard temperature of C y Historical monitoring power is P a ', the coefficient of influence of temperature on power is alpha, and the corresponding theoretical power under the condition of standard parameters is P b Then P is b The calculation formula of (2) is as follows:
P b ＝(1-(C X -C y )*α)*P a ′
s240, carrying out iterative training by adopting a time sequence prediction method based on the corresponding theoretical power of the target photovoltaic module under each standard parameter condition to obtain the predicted power of the target photovoltaic module under the standard parameter condition.
The historical monitoring power is converted into the corresponding theoretical power of the target photovoltaic module under each standard parameter condition, iterative training is performed by adopting a time sequence prediction method to obtain the predicted power under the standard parameter condition, and the condition that errors are caused by direct comparison of single-time acquired data can be avoided.
Optionally, the time series prediction method comprises at least one or more of a naive prediction method, a moving average method, a weighted moving average method, and ARIMA.
It should be noted that which prediction method is specifically adopted may be selected according to actual situations, and is not limited herein.
And S250, converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power of the target photovoltaic module under the monitored temperature according to the standard parameter condition, the predicted power of the target photovoltaic module under the standard parameter condition and the power influence coefficient of the temperature under the standard parameter condition, and recording as a second power.
Because the photovoltaic conversion of the photovoltaic module is influenced by the temperature, in order to ensure that the subsequent cleaning judgment is not influenced by the temperature and the irradiation factor, the predicted power of the target photovoltaic module under the standard parameter condition is converted into the corresponding predicted power (namely, the second power) of the target photovoltaic module under the monitoring temperature, so that the influence of the first power and the second power on the temperature is consistent, and the influence of the temperature and the irradiation factor on the cleaning judgment is eliminated.
Wherein the standard parameter conditions are standard irradiation and standard temperature conditions. Illustratively, the monitoring temperature when the irradiation reaches the preset irradiation is set to C X Standard temperature of C y The influence coefficient of temperature on power is alpha, and the predicted power under the condition of standard parameters is P s The corresponding predicted power at the monitored temperature is P t Then P is t The calculation formula of (2) is as follows:
P t ＝(1-(C X -C y )*α)*P s
s260, judging whether the difference value of the first power and the second power is larger than a preset difference value or not, and cleaning the target photovoltaic module if the difference value of the first power and the second power is larger than the preset difference value.
The preset difference value may be set according to an actual situation, and is not specifically limited herein.
Specifically, if the difference between the first power (actually measured monitoring power) and the second power (theoretical power) is greater than a preset difference, it indicates that dust on the photovoltaic module has an adverse effect on photovoltaic power generation, and the photovoltaic module needs to be cleaned at this time. If the difference value between the first power and the second power is smaller than or equal to the preset difference value, the situation that dust of the photovoltaic module does not affect or has little influence on photovoltaic power generation is shown, and the photovoltaic module does not need to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be timely cleaned, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased and the like is avoided, and the best cleaning benefit of the photovoltaic assembly is achieved.
And S270, acquiring and obtaining the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation in real time.
The target photovoltaic module is subjected to power actual measurement after being judged to be required to be cleaned and cleaned each time, namely, the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation is monitored and collected in real time, so that the second power is obtained based on the actual measurement power value after historical cleaning during cleaning judgment each time, and the accuracy and the effectiveness of cleaning judgment are ensured.
And S280, converting the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation into the theoretical power under the condition of standard parameters, and storing the theoretical power into a historical database.
Specifically, according to the standard parameter conditions (i.e., the standard irradiation and the standard temperature conditions), the monitoring power and the temperature influence coefficient of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation, the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation is converted into the corresponding theoretical power of the target photovoltaic module under each standard parameter condition according to the power conversion formula in the step S230, which is not described herein again. The monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation is converted into the theoretical power under the condition of standard parameters and stored in the historical database, so that the actually measured power data of the target photovoltaic module after historical cleaning in the historical database can be conveniently taken when the photovoltaic module is cleaned and judged each time, the error problem caused by single data acquisition comparison can be avoided, and the accuracy of detection and judgment is improved.
In the technical scheme of the embodiment, the working principle of the cleaning method for the photovoltaic module is as follows: acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power; acquiring historical monitoring power of the target photovoltaic module after each cleaning when the monitoring irradiation reaches the preset irradiation; respectively converting each historical monitoring power into corresponding theoretical power of the target photovoltaic module under each standard parameter condition; performing iterative training by adopting a time sequence prediction method based on the theoretical power corresponding to the target photovoltaic module under each standard parameter condition to obtain the predicted power of the target photovoltaic module under the standard parameter condition; according to the standard parameter condition, the predicted power of the target photovoltaic module under the standard parameter condition and the influence coefficient of the temperature on the power, converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power of the target photovoltaic module under the monitoring temperature, and recording the predicted power as a second power; judging whether the difference value of the first power and the second power is larger than a preset difference value, if so, cleaning the target photovoltaic module; after a target photovoltaic module is cleaned, acquiring and acquiring monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation in real time; and converting the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation into the theoretical power under the condition of standard parameters, and storing the theoretical power in a historical database. Therefore, actual measurement power data of the target photovoltaic module after historical cleaning is converted into prediction power under a standard parameter condition and then converted into prediction power under a monitoring temperature, namely second power, the second power is compared with a difference value of the actually measured monitoring power (namely first power) of the target photovoltaic module, whether the preset difference value is met or not is judged, if yes, dust of the photovoltaic module does not influence photovoltaic power generation, and the photovoltaic module needs to be cleaned. If the preset difference value is not met, the situation that dust of the photovoltaic module does not influence or has little influence on photovoltaic power generation at the moment is indicated, and the photovoltaic module does not need to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be cleaned in time, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased, and the like is solved, and the best cleaning benefit of the photovoltaic assembly is achieved.
Fig. 3 is a schematic structural diagram of a photovoltaic module cleaning apparatus provided in an embodiment of the present invention. As shown in fig. 3, the apparatus includes: the monitoring temperature acquisition module 10 is used for acquiring the monitoring temperature corresponding to the target photovoltaic module when the monitoring irradiation reaches the preset irradiation; the first power obtaining module 20 is configured to obtain monitoring power corresponding to a target photovoltaic module when the monitored irradiation reaches a preset irradiation, and record the monitoring power as a first power; a historical actual measurement power data acquisition module 30, configured to acquire actual measurement power data of the target photovoltaic module after historical cleaning; the predicted power determining module 40 is used for determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actually measured power data after the historical cleaning; the second power determining module 50 is configured to convert the predicted power of the target photovoltaic module under the standard parameter condition into a corresponding predicted power at the monitored temperature, and record the predicted power as a second power; and the judging module 60 is configured to judge whether the first power and the second power meet a preset cleaning condition, and if so, cleaning the target photovoltaic module.
The technical scheme of this embodiment through providing a photovoltaic module belt cleaning device, this photovoltaic module belt cleaning device includes: the monitoring temperature acquisition module is used for acquiring the monitoring temperature corresponding to the target photovoltaic module when the monitoring irradiation reaches the preset irradiation; the first power acquisition module is used for acquiring monitoring power corresponding to the target photovoltaic module when the monitoring irradiation reaches the preset irradiation, and recording the monitoring power as first power; the historical actual measurement power data acquisition module is used for acquiring actual measurement power data of the target photovoltaic module after historical cleaning; the predicted power determining module is used for determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actually measured power data after the historical cleaning; the second power determining module is used for converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitoring temperature, and recording the predicted power as second power; and the judging module is used for judging whether the first power and the second power meet the preset cleaning condition, and if so, cleaning the target photovoltaic module. Therefore, actual measurement power data of the target photovoltaic module after historical cleaning is converted into prediction power under a standard parameter condition and then converted into prediction power under a monitoring temperature, namely second power, the second power is compared with the actually measured monitoring power (namely first power) of the target photovoltaic module, whether the preset cleaning condition is met or not is judged, if yes, dust of the photovoltaic module adversely affects photovoltaic power generation, and the photovoltaic module needs to be cleaned. If the preset cleaning condition is not met, the situation that the dust of the photovoltaic module does not influence or has little influence on photovoltaic power generation at the moment is indicated, and the photovoltaic module does not need to be cleaned at the moment. Therefore, the dust of the photovoltaic assembly can be cleaned in time, loss caused by improper cleaning of the photovoltaic assembly is avoided, the problem that photovoltaic power generation is influenced due to untimely cleaning, the cleaning cost is excessively increased, and the like is solved, and the best cleaning benefit of the photovoltaic assembly is achieved.
Optionally, the historical measured power data obtaining module 30 includes:
and the historical monitoring power acquisition unit is used for acquiring the historical monitoring power of the target photovoltaic module after being cleaned each time when the monitoring irradiation reaches the preset irradiation.
Optionally, the predicted power determining module 40 includes:
the theoretical power determining unit is used for respectively converting each historical monitoring power into the theoretical power corresponding to the target photovoltaic module under each standard parameter condition;
and the predicted power determining unit is used for performing iterative training by adopting a time sequence prediction method based on the theoretical power corresponding to the target photovoltaic module under each standard parameter condition to obtain the predicted power of the target photovoltaic module under the standard parameter condition.
Optionally, the theoretical power determining unit is further configured to convert the historical monitoring power into theoretical power corresponding to the target photovoltaic module under each standard parameter condition according to the standard parameter condition, the historical monitoring power, and a power influence coefficient of temperature.
Optionally, the time series prediction method comprises at least one or more of naive prediction method, moving average method, weighted moving average method and ARIMA.
Optionally, the standard parameter conditions are: standard irradiation and standard temperature conditions.
Optionally, the second power determining module 50 includes:
and the second power determining unit is used for converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power of the target photovoltaic module under the monitored temperature according to the standard parameter condition, the predicted power of the target photovoltaic module under the standard parameter condition and the power influence coefficient of the temperature on the power, and recording the predicted power as the second power.
Optionally, the determining module 60 includes: and the judging unit is used for judging whether the difference value of the first power and the second power is greater than a preset difference value or not, and cleaning the target photovoltaic module if the difference value is greater than the preset difference value.
Optionally, the preset irradiation is a standard irradiation.
Optionally, the photovoltaic module cleaning device further comprises: and the post-cleaning monitoring power acquisition module is used for acquiring and acquiring the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation in real time.
And the theoretical power conversion and storage module is used for converting the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation into the theoretical power under the condition of standard parameters and storing the theoretical power in a historical database.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A photovoltaic module cleaning method is characterized by comprising the following steps:
acquiring monitoring temperature and monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches a preset irradiation, and recording the monitoring power as a first power;
acquiring actual measurement power data of the target photovoltaic module after historical cleaning, and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actual measurement power data after the historical cleaning;
converting the predicted power of the target photovoltaic module under the standard parameter condition into corresponding predicted power under the monitored temperature, and recording as second power;
and judging whether the first power and the second power meet preset cleaning conditions, and if so, cleaning the target photovoltaic module.
2. The method according to claim 1, wherein the step of obtaining measured power data of the target photovoltaic module after the historical cleaning and determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the measured power data after the historical cleaning comprises:
obtaining historical monitoring power of the target photovoltaic module after each cleaning when the monitoring irradiation reaches the preset irradiation;
respectively converting each historical monitoring power into theoretical power corresponding to the target photovoltaic module under each standard parameter condition;
and performing iterative training by adopting a time sequence prediction method based on the theoretical power corresponding to the target photovoltaic module under each standard parameter condition to obtain the predicted power of the target photovoltaic module under the standard parameter condition.
3. The method for cleaning photovoltaic modules according to claim 2, wherein the step of converting each historical monitoring power into a theoretical power corresponding to the target photovoltaic module under the standard parameter condition comprises:
and converting the historical monitoring power into theoretical power corresponding to the target photovoltaic module under each standard parameter condition according to standard parameter conditions, historical monitoring power and a power influence coefficient of temperature.
4. The method of claim 2, wherein the time series prediction method comprises at least one or more of a naive prediction method, a moving average method, a weighted moving average method, and ARIMA.
5. The method according to claim 1, wherein the standard parameter conditions are: standard irradiation and standard temperature conditions.
6. The method for cleaning photovoltaic modules according to claim 1, wherein the step of converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power at the monitored temperature and recording the predicted power as the second power comprises the following steps:
and converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power of the target photovoltaic module under the monitoring temperature according to the standard parameter condition, the predicted power of the target photovoltaic module under the standard parameter condition and the power influence coefficient of the temperature to the power, and recording as a second power.
7. The method for cleaning a photovoltaic module according to claim 1, wherein the step of judging whether the first power and the second power meet a preset cleaning condition, and if so, cleaning the target photovoltaic module comprises the steps of:
and judging whether the difference value of the first power and the second power is larger than a preset difference value or not, and cleaning the target photovoltaic module if the difference value of the first power and the second power is larger than the preset difference value.
8. The method according to claim 1, wherein the predetermined irradiation is a standard irradiation.
9. The photovoltaic module cleaning method according to claim 1, further comprising, after cleaning the photovoltaic module:
acquiring monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation in real time;
and converting the monitoring power of the cleaned photovoltaic module when the monitoring irradiation reaches the preset irradiation into the theoretical power under the condition of standard parameters, and storing the theoretical power in a historical database.
10. A photovoltaic module cleaning device, comprising:
the monitoring temperature acquisition module is used for acquiring the monitoring temperature corresponding to the target photovoltaic module when the monitoring irradiation reaches the preset irradiation;
the first power acquisition module is used for acquiring monitoring power corresponding to a target photovoltaic module when the monitoring irradiation reaches the preset irradiation, and recording the monitoring power as first power;
the historical actual measurement power data acquisition module is used for acquiring actual measurement power data of the target photovoltaic module after historical cleaning;
the predicted power determining module is used for determining the predicted power of the target photovoltaic module under the condition of standard parameters according to the actually measured power data after the historical cleaning;
the second power determining module is used for converting the predicted power of the target photovoltaic module under the standard parameter condition into the corresponding predicted power under the monitoring temperature and recording the predicted power as second power;
and the judging module is used for judging whether the first power and the second power meet preset cleaning conditions, and cleaning the target photovoltaic module if the first power and the second power meet the preset cleaning conditions.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388664A (en) * | 2023-03-17 | 2023-07-04 | 江苏华信新能源管理有限公司 | Dedusting method, device, equipment and storage medium for photovoltaic equipment |
| CN117367624A (en) * | 2023-12-05 | 2024-01-09 | 徐州威聚电子材料有限公司 | Semiconductor cleaning liquid temperature detection method and detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388664A (en) * | 2023-03-17 | 2023-07-04 | 江苏华信新能源管理有限公司 | Dedusting method, device, equipment and storage medium for photovoltaic equipment |
| CN117367624A (en) * | 2023-12-05 | 2024-01-09 | 徐州威聚电子材料有限公司 | Semiconductor cleaning liquid temperature detection method and detection device |
| CN117367624B (en) * | 2023-12-05 | 2024-02-23 | 徐州威聚电子材料有限公司 | Semiconductor cleaning liquid temperature detection method and detection device |
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