LU504189B1 - A system for monitoring the surface temperature of photovoltaic modules - Google Patents

A system for monitoring the surface temperature of photovoltaic modules Download PDF

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Publication number
LU504189B1
LU504189B1 LU504189A LU504189A LU504189B1 LU 504189 B1 LU504189 B1 LU 504189B1 LU 504189 A LU504189 A LU 504189A LU 504189 A LU504189 A LU 504189A LU 504189 B1 LU504189 B1 LU 504189B1
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Luxembourg
Prior art keywords
temperature
temperature data
historical
data
photovoltaic
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LU504189A
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French (fr)
Inventor
Fan Zhang
Yun Tang
Quanxi Sun
Weiguo Yang
Dehui Zhu
Jijun Ye
Han Wang
Yang Liu
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Huaneng Xinjiang Energy Dev Co Ltd New Energy Dongjiang Branch
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Publication of LU504189B1 publication Critical patent/LU504189B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photovoltaic Devices (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)

Abstract

The invention provides a system for monitoring the surface temperature of photovoltaic modules comprising: a collection acquisition module for acquiring a collection of historical temperature data for each photovoltaic module; a temperature acquisition module for collecting temperature data based on a temperature sensor on the surface of the photovoltaic module; a problem component determination module: for comparing the first temperature data of the same photovoltaic module with the maximum permissible operating temperature. By acquiring and comparing the temperature on the surface of the PV element in real time, identifying the problem element and determining the component failure problem through analysis, it enables timely and accurate temperature monitoring of the PV element and increases its service life.

Description

A system for monitoring the surface temperature of photovoltaic | “°°6188 modules
Technical field
The present invention relates to the field of temperature monitoring and in particular to a system for monitoring the surface temperature of photovoltaic modules.
Background technology
At present, the collection of temperature of photovoltaic power generation system is very important for system power generation, the temperature has a large impact on photovoltaic components, according to the requirements of technical supervision work, the infrared inspection of photovoltaic components needs to be carried out every year to replace the components with hot spots, busbar desoldering and burst boards,.
However, the summer weather is hot and the inspection cycle is long, personnel are prone to heat stroke. And because manual monitoring cannot be done in a timely manner, it can lead to bigger problems with the photovoltaic components and reduce their service life.
The present invention therefore provides a system for monitoring the surface temperature of photovoltaic modules.
Content of the invention
The present invention provides a system for monitoring the surface temperature of photovoltaic modules for identifying problematic components by acquiring and comparing the surface temperature of photovoltaic components in real time, and identifying component failure problems by analysing the problematic components. This enables timely and accurate temperature monitoring of photovoltaic modules, thereby reducing the likelihood of serious module failures and increasing the service life of the modules.
The present invention provides a system for monitoring the surface temperature of photovoltaic modules, comprising a collection acquisition module: for acquiring a collection of historical temperature data for each photovoltaic element in a target photovoltaic module a temperature determination module: for obtaining the maximum temperature at which each photovoltaic element in the target photovoltaic module is allowed to operate in accordance with the device operating criteria and in combination with the set of historical temperature data, temperature acquisition module: for collecting the first temperature data of the corresponding photovoltaic element in real time based on the temperature sensors set on the surface of each photovoltaic element, problem component determination module: for comparing the first temperature data of the same PV element with the maximum temperature allowed to operate and determining thé/504189 problem component,
Component problem verification module: for activating a backup temperature sensor of said problem element, for temperature acquisition verification and for determining the problem of the element.
In one possible way of implementation, a collection acquisition module, comprising a historical data acquisition unit: for acquiring historical temperature data for each PV element in the target PV module and for acquiring historical element performance for the PV element corresponding to the historical temperature data, a historical data analysis unit: for analysing the corresponding historical temperature data based on a first temperature-performance criterion to obtain a collection of historical temperature data for each PV element, wherein a PV element corresponds to a collection of historical temperature data, and each collection of historical temperature data contains all valid historical temperature data for the same PV element, the corresponding historical element performance and the results of the analysis of the historical temperature data.
In one possible way of implementation, a temperature determination module, comprising: a performance screening unit: for determining, based on historical component performance, whether a current PV component has experienced a component failure problem; temperature screening unit: for obtaining the temperature data analysis results corresponding to the component in which the component failure problem has occurred, and determining whether the occurrence of the component failure problem is due to a temperature anomaly;
If the temperature data analysis result is judged not to be caused by a temperature abnormality, the current historical temperature data, historical component performance and temperature data analysis result are rejected and the judgment is made again; if the temperature data analysis result is judged to be caused by a temperature anomaly, extracting the corresponding historical temperature data; a collection determination unit: for constructing an abnormal temperature data collection based on said abnormal temperature historical temperature data and constructing a normal temperature data collection from the remaining historical temperature data; comparing the historical temperature data in the abnormal temperature data set one by one to obtain the minimum abnormal temperature in the abnormal temperature data set as the first reference temperature; comparing the historical temperature data in the normal temperature data collection one by one to obtain the maximum normal temperature in the normal temperature data collection as thé/504189 second reference temperature; a temperature determination unit: for determining whether the first reference temperature is greater than the second reference temperature; if the first reference temperature is greater than the second reference temperature, calculating the average value of the first reference temperature and the second reference temperature as the maximum temperature at which the photovoltaic element is currently allowed to operate;
Instead, the first reference temperature is removed from the abnormal temperature data set and the second reference temperature is removed from the normal temperature data set, and the comparison is carried out again to determine the corrected first reference temperature and the corrected second reference temperature, and the comparison is judged again until the corrected first reference temperature is greater than the corrected second reference temperature to obtain the maximum temperature at which the PV element is currently allowed to operate.
In one possible way of implementation, a performance screening unit, comprising: if the current PV element does not have a component failure problem, screening all historical temperature data in the historical temperature data collection and comparing them to obtain a maximum value of said historical temperature data as the maximum reference temperature at which the current PV element is allowed to operate, to be transmitted to the problem element determination module;
If a component failure problem occurs, the corresponding historical temperature data and the results of the historical temperature data analysis are extracted and transmitted to the temperature screening unit.
In one possible way of implementation, a temperature acquisition module, comprising: a data acquisition unit: for collecting temperature data for a number of areas on the surface of the photovoltaic element at the corresponding moment when the measured temperatures of the temperature sensors on the surface of the photovoltaic element are all higher than a preset temperature a temperature difference determination unit: for comparing the collected temperature data one by one and determining the temperature difference value between each temperature data and the remaining temperature data
Comparison transmission unit: for comparing all temperature difference values, taking the maximum temperature difference value as the first temperature data of the current photovoltaic element and transmitting said first temperature data and the corresponding temperature sensor number to the problem element determination module.
In one possible way of implementation, the problem element determination modulleV504189 comprising: a temperature comparison unit: if the current PV element has not had a component failure problem, comparing the first temperature data of the current PV element with a maximum reference temperature;
If the first temperature data is greater than the maximum reference temperature of the PV element, the current PV element is judged to be a possible problem element and the corresponding temperature sensor number is transmitted to the component problem inspection module; conversely, the current PV element is judged to be fault-free if the current PV element has had a component failure problem, the first temperature data of the current PV element is compared with the maximum temperature data allowed to operate;
If the first temperature data is greater than the maximum temperature data of the PV element, the current PV element is judged to be a problem component and the corresponding temperature sensor number is transmitted to the component problem inspection module;
Conversely, the current PV element is judged to be fault-free.
In one possible way of implementation, a component problem inspection module, comprising: a number determination unit: for determining the number of the PV element with a component fault and a possible fault problem based on the number of the temperature sensor; data re-acquisition unit: for activating the corresponding backup temperature sensor based on said PV element number and re-acquiring temperature data for the current PV element in combination with the original temperature sensor to obtain a second temperature data; temperature difference judgement unit: for judging the temperature difference value between each temperature data in the second temperature data and the remaining temperature data based on the obtained second temperature data;
If the temperature difference value is higher than the first preset temperature difference value, the corresponding temperature sensor number is obtained, the fault location of the problem element is determined, and a corresponding fault list is constructed;
Problem identification unit: used to identify problems with PV components based on a list of faults and transmit them to the intelligent management terminal for early warning.
In one possible way of implementation, a problem determination unit, comprising a fault classification subunit: for classifying the fault list based on the fault location and determining the maximum temperature difference value corresponding to the problem element within a predetermined element area; fault determination subunit: for determining the fault problem of the PV element corresponding to the current temperature difference value based on a comparison of satd/504189 maximum temperature difference value with a temperature difference-fault criterion
Fault warning subunit: for determining the corresponding fault number and fault level based on said fault problem and transmitting it to the intelligent management terminal for early 5 warning and maintenance.
Other features and advantages of the present invention will be set forth in the subsequent specification and, in part, will become apparent from the specification or will be understood by carrying out the invention. The objects and other advantages of the present invention may be achieved and obtained by means of the structures particularly indicated in the written specification, the claims, and the accompanying drawings.
The technical solutions of the invention are described in further detail below by means of the accompanying drawings and embodiments.
Description of attached figures
The accompanying drawings are used to provide a further understanding of the invention and form part of the specification and, together with the embodiments of the invention, are used to explain the invention and do not constitute a limitation of the invention. In the accompanying drawings:
Figure 1 shows a structural view of a system for monitoring the surface temperature of photovoltaic modules in an embodiment of the present invention;
Figure 2 shows a structural diagram of a temperature determination module in A system for monitoring the surface temperature of photovoltaic modules in an embodiment of the present invention;
Figure 3 shows a structural diagram of a component problem checking module in A system for monitoring the surface temperature of photovoltaic modules in an embodiment of the present invention.
Specific embodiments
Preferred embodiments of the invention are described below in conjunction with the accompanying drawings, it being understood that the preferred embodiments described herein are for the purpose of illustrating and explaining the invention only and are not intended to limit the invention.
Example 1:
Embodiments of the present invention provide A system for monitoring the surface temperature of photovoltaic modules, as shown in Figure 1, comprising: a collection acquisition module: for acquiring a collection of historical temperature data for each photovoltaic element in a target photovoltaic module;
a temperature determination module: for obtaining the maximum temperature at whid{}504189 each photovoltaic element in the target photovoltaic module is allowed to operate according to the device operating criteria and in combination with the set of historical temperature data; temperature acquisition module: for collecting the first temperature data of the corresponding photovoltaic element in real time based on the temperature sensors set on the surface of each photovoltaic element; problem component determination module: for comparing the first temperature data of the same PV element with the maximum temperature allowed to operate and determining the problem component;
Component problem verification module: for activating a backup temperature sensor of said problem element, for temperature acquisition verification and for determining the problem of the element.
The target PV module in this embodiment refers to all components of the PV generation area where temperature monitoring is required, wherein the target PV module comprises a target
PV element, a housing and a connector.
In this embodiment, PV element means a component of the target PV module that plays an important role, for example, the PV element may be a solar panel.
In this embodiment, the historical temperature collection is a collection containing historical temperature data for the current PV element, corresponding historical element performance and the results of the analysis of the historical temperature data.
In this embodiment, the device operating standard is the operating standard for the PV element to perform normal work in the current environment, for example, one of the operating standards of the device is the minimum power available for one square meter of PV element for one hour under normal sunlight is 1 kilowatt, if the power available is less than 1 kilowatt, then the PV element is judged to have a problem.
In this embodiment, the maximum allowable operating temperature is the maximum temperature difference between the temperature data collected by the corresponding temperature sensor when the PV element is performing normal operation, obtained based on the historical temperature data of the PV element.
In this embodiment, the temperature sensor is a sensor provided on the surface of the photovoltaic element to measure the temperature of the surface of the photovoltaic element.
The first temperature data in this embodiment means that when a temperature of the PV element is higher than a preset temperature value, the real-time temperature data of the current
PV element is collected and the temperature difference of all temperature data is obtained, where the maximum temperature difference value is the corresponding first temperature data.
The element in question in this embodiment is the photovoltaic element for which thé/504189 obtained first temperature data is higher than the maximum temperature corresponding to the permitted operation.
In this embodiment, the standby temperature sensor is a temperature sensor that is pre-set at the corresponding position of the PV element and does not carry out temperature data collection under normal conditions, and activates the standby temperature sensor for temperature data collection when the PV element has a problem.
In this embodiment, the problems of the components include hot spots, desoldering, etc.
The beneficial effect of the above technical solution is that by acquiring and comparing the surface temperature of the photovoltaic components in real time, thereby identifying the problematic components, and by analysing the problematic components to identify component failure problems, it enables timely and accurate temperature monitoring of the photovoltaic components, thereby reducing the likelihood of serious component failures and increasing service life.
Example 2:
Based on Example 1, a collection acquisition module, comprising: (a) a historical data acquisition unit: for obtaining historical temperature data for each PV element in the target PV module and obtaining historical component performance of the PV element corresponding to the historical temperature data; a historical data analysis unit: for analysing the corresponding historical temperature data based on a first temperature-performance criterion to obtain a collection of historical temperature data for each PV element wherein a PV element corresponds to a collection of historical temperature data, and each collection of historical temperature data contains all valid historical temperature data for the same PV element, the corresponding historical element performance and the results of the analysis of the historical temperature data.
The target PV module in this embodiment refers to all components of the PV generation area where temperature monitoring is required, wherein the target PV module comprises a target
PV element, a housing and a connector.
In this embodiment, the PV element is a component that plays an important role in the target PV module, for example, the PV element may be a solar panel.
In this embodiment, the historical temperature data is obtained by processing the temperature data acquired by the temperature sensor during the historical operation of the current
PV element.
In this embodiment, the historical component performance refers to the working performance of the current photovoltaic component based on each historical temperature data/504189 for example, the historical component working performance includes component working stability, component normal working capacity, etc.
In this embodiment, the first temperature-performance criterion refers to the performance criterion situation corresponding to each temperature data of the current photovoltaic element, for example, when the temperature data is 10 degrees Celsius, that 1s, the temperature difference on the surface of the photovoltaic element reaches 10 degrees Celsius, then the corresponding element working stability is 5 (total score of 10), the normal working capacity of the element 1s 1.1 (the normal working capacity of the element is greater than 1 that 1s, the element can work)
This means that the component can work when the temperature data is 10 degrees Celsius, but the working stability is poor.
In this embodiment, the historical temperature data collection is a collection containing the historical temperature data of the current PV element, the corresponding historical element performance and the results of the historical temperature data analysis.
In this embodiment, one photovoltaic element corresponds to one historical temperature data set.
The beneficial effect of the above technical solution is that by obtaining the historical temperature data of the photovoltaic components and thus determining the maximum temperature allowed to work based on the historical temperature and comparing it with the real time temperature, the problematic components can be identified, making the temperature monitoring of the photovoltaic components more accurate and thus reducing the possibility of serious component failures.
Example 3:
Based on Example 2, a temperature determination module, as shown in Figure 2, comprising: a performance screening unit: for determining whether a component failure problem has occurred for a current PV component based on historical component performance temperature screening unit: for obtaining the temperature data analysis results corresponding to the component in which the component failure problem has occurred, and determining whether the occurrence of the component failure problem is due to a temperature abnormality;
If the temperature data analysis result is judged not to be caused by a temperature abnormality, the current historical temperature data, historical component performance and temperature data analysis result are rejected and the judgment is made again; if the temperature data analysis result is judged to be caused by a temperature anomaly,
extracting the corresponding historical temperature data; LUS04189 a collection determination unit: for constructing an abnormal temperature data collection based on said abnormal temperature historical temperature data and constructing a normal temperature data collection from the remaining historical temperature data; comparing the historical temperature data in the abnormal temperature data set one by one to obtain the minimum abnormal temperature in the abnormal temperature data set as the first reference temperature; comparing the historical temperature data in the normal temperature data collection one by one to obtain the maximum normal temperature in the normal temperature data collection as the second reference temperature; a temperature determination unit: for determining whether the first reference temperature is greater than the second reference temperature; if the first reference temperature is greater than the second reference temperature, the average value of the first reference temperature and the second reference temperature is calculated as the maximum temperature at which the PV element is currently allowed to operate;
Conversely, the first reference temperature is removed from the abnormal temperature data set and the second reference temperature is removed from the normal temperature data set, and the comparison is carried out again to determine the corrected first reference temperature and the corrected second reference temperature, and the comparison is judged again until the corrected first reference temperature is greater than the corrected second reference temperature to obtain the maximum temperature at which the current photovoltaic element is allowed to operate.
In this embodiment, the historical component operating performance refers to the current
PV component operating performance when operating based on each historical temperature data, for example, the historical component operating performance includes component operating stability, component normal operating capability, etc.
In this embodiment, a component that has a component failure problem is a component that does not have normal operating capability and only needs to be identified as a component failure, and does not need to be subject to a component failure problem determination, which is then performed in the component problem inspection module.
In this embodiment, the temperature data analysis result is based on the temperature data analysis to obtain the corresponding analysis results, temperature data analysis results include normal temperature analysis and abnormal temperature analysis, some components have a failure, but its corresponding temperature data belongs to the normal temperature data range, so you need to determine whether the temperature data corresponding to the component is normal temperature data based on the temperature data analysis results and historical component performance Therefore, it is necessary to determine whether the temperature data correspondiftg/504189 to the component is normal based on the results of the temperature data analysis and the historical performance of the component.
In this embodiment, the abnormal temperature data set is a set constructed of historical temperature data with abnormal temperature data, and the normal temperature data set is a set constructed of historical temperature data with normal temperature data.
In this embodiment, the first reference temperature is the historical temperature data in the abnormal temperature data set compared one by one to obtain a minimum abnormal temperature in the abnormal temperature data set.
In this embodiment, the second reference temperature is the historical temperature data in the normal temperature data set compared one by one to obtain a maximum normal temperature in the normal temperature data set.
In this embodiment, where the first reference temperature is greater than the second reference temperature, the average of the first reference temperature and the second reference temperature is taken as the maximum temperature at which the PV element is currently allowed to operate.
The beneficial effect of the above technical solution is that by obtaining the historical temperature data of the photovoltaic element and determining the maximum temperature allowed to work, and thus comparing it with the real-time temperature, the problematic element can be identified, making the temperature monitoring of the photovoltaic element more accurate, thus reducing the possibility of serious failures of the element and increasing its service life.
Example 4:
Based on Example 3, a performance screening unit, comprising; if the current PV element does not have a component failure problem, screening all the historical temperature data in the historical temperature data collection and comparing them to obtain a maximum value of said historical temperature data as the maximum reference temperature at which the current PV element is allowed to operate, to be transmitted to the problem element determination module;
If a component failure problem occurs, the corresponding historical temperature data and the results of the historical temperature data analysis are extracted and transmitted to the temperature screening unit.
In this embodiment, the maximum temperature allowed to work is the maximum temperature difference between the temperature data collected by the corresponding temperature sensor when the PV element is performing normal operation, obtained based on the historical temperature data of the PV element.
In this embodiment, the historical temperature data refers to the temperature data obtainéd/504189 by the temperature sensor during the historical operation of the current photovoltaic element after processing.
In this embodiment, the historical temperature data collection is a collection containing the historical temperature data of the current photovoltaic element, the corresponding historical element performance and the historical temperature data analysis results.
The beneficial effect of the above technical solution is that by acquiring the historical temperature data of the photovoltaic element and determining the maximum temperature at which it is allowed to operate, and thus comparing it with the real time temperature, the problematic element can be identified, making the temperature monitoring of the photovoltaic element more accurate, thus reducing the possibility of serious failures of the element and increasing its service life.
Example 5:
Based on Example 3, a temperature acquisition module, comprising; a data acquisition unit: for collecting temperature data for a number of areas on the surface of the photovoltaic element at a corresponding moment when the measured temperatures of the temperature sensors on the surface of the photovoltaic element are all higher than a preset temperature; a temperature difference determination unit: for comparing the collected temperature data one by one and determining the temperature difference value between each temperature data and the remaining temperature data comparison transmission unit: for comparing all temperature difference values, taking the maximum temperature difference value as the first temperature data of the current photovoltaic element and transmitting said first temperature data and the corresponding temperature sensor number to the problem element determination module.
In this embodiment, the preset temperature is the maximum temperature value at which the photovoltaic element can operate, determined on the basis of the current element performance of the photovoltaic element and the corresponding environment.
The temperature data in this embodiment is the real-time temperature data collected by the temperature sensors on the surface of the PV element.
The temperature difference value in this embodiment refers to the temperature difference value between the corresponding each temperature data and the remaining temperature data based on the collected real-time temperature data, wherein the temperature difference value is a positive number, for example, if the real-time temperature data is 20, 21, 21, 23, 24, then the corresponding temperature difference value is 1, 1, 3, 4,0, 2, 3, 2, 3, 1.
In this embodiment, the maximum temperature difference value is the temperatuk&504189 difference value of the largest difference in the temperature difference value, when the maximum temperature difference value exists more than one, extract the corresponding all temperature data and the corresponding temperature difference value.
In this embodiment, the first temperature data is when a temperature of the photovoltaic element is higher than a preset temperature value, the current real-time temperature data of the photovoltaic element is collected, and the temperature difference of all temperature data is obtained, where the maximum temperature difference value, that is, the corresponding first temperature data.
The beneficial effect of the above technical solution is that by acquiring the surface temperature of the PV element in real time and thus comparing it with the historical temperature data to identify the problem element, it enables timely and accurate temperature monitoring of the PV element, thus reducing the possibility of serious failures of the element.
Example 6:
Based on Example 5, a problem element determination module, comprising; a temperature comparison unit: comparing the first temperature data of the current PV element with a maximum reference temperature if the current PV element has not experienced a component failure problem;
If the first temperature data is greater than the maximum reference temperature of the PV element, the current PV element is judged to be a possible problem element and the corresponding temperature sensor number is transmitted to the component problem inspection module; conversely, the current PV element is judged to be fault-free; if the current PV element has had a component failure problem, the first temperature data of the current PV element is compared with the maximum temperature data allowed to operate;
If the first temperature data is greater than the maximum temperature data of the PV element, the current PV element is judged to be a problem component and the corresponding temperature sensor number is transmitted to the component problem inspection module;
Conversely, the current photovoltaic element is judged to be fault-free.
In this embodiment, the component fault problem refers to the corresponding fault problem when the component does not work properly.
In this embodiment, the first temperature data means that when a temperature of the PV element is higher than a preset temperature value, the real-time temperature data of the current
PV element is collected and the temperature difference of all temperature data is obtained, where the maximum temperature difference value is the corresponding first temperature data.
In this embodiment, the maximum reference temperature is the maximum temperature dakd/504189 in the corresponding temperature data set that can be used as the maximum reference temperature of the PV component when the current PV component has not had a component failure problem, and the maximum reference temperature of the same PV component is less than or equal to the maximum temperature data allowed to operate.
In this embodiment, the problem component is the PV component that has a fault problem, and when the first temperature data is greater than the maximum reference temperature of the PV component, the current PV component may or may not be a problem component.
In this embodiment, the maximum temperature data allowed to work is the maximum temperature difference between the temperature data collected by the corresponding temperature sensor when the PV element is subjected to normal operation, obtained based on the historical temperature data of the PV element.
The beneficial effect of the above technical solution is that by acquiring and comparing the surface temperature of the PV element in real time, thereby identifying the problem element and determining the element failure problem through analysis of the problem element, it is possible to make the temperature monitoring of the PV element timely and accurate, thereby reducing the possibility of serious element failure and increasing the service life.
Example 7:
Based on Example 6, a component problem inspection module, as shown in Figure 3, comprising: a number determination unit: for determining the number of the PV element with a component fault and a possible fault problem based on the number of the temperature sensor; data re-acquisition unit: for activating the corresponding backup temperature sensor based on said PV element number and re-acquiring temperature data for the current PV element in combination with the original temperature sensor to obtain a second temperature data; temperature difference judgement unit: for judging the temperature difference value between each temperature data in the second temperature data and the remaining temperature data based on the obtained second temperature data; if the temperature difference value is higher than the first preset temperature difference value, obtaining the corresponding temperature sensor number, determining the fault location of the problem element and constructing a corresponding fault list;
Problem determination unit: for determining, based on the fault list, the problems existing in the photovoltaic element and transmitting to the intelligent management terminal for early warning.
In this embodiment, the standby temperature sensor is a temperature sensor that is pre-set on each area of the PV element surface and does not collect temperature during normal operatid/504189 of the PV element. When the PV element fails, the standby temperature sensor is used to collect temperature data in order to determine the location of the failure and the cause of the failure.
In this embodiment, the second temperature data means that when the PV element fails, in order to determine the location of the failure and the cause of the failure, the original temperature sensor and the backup temperature sensor are used to collect the real-time temperature data of the current PV element and obtain the temperature difference of all the temperature data, where the maximum temperature difference value, which is the corresponding second temperature data.
In this embodiment, the temperature difference value refers to the temperature difference value between the corresponding each temperature data and the remaining temperature data based on the collected real time temperature data, which is compared one by one, where the temperature difference value is a positive number, for example, if the real time temperature data is 20, 21, 21, 23, 24, the corresponding temperature difference value is 1, 1, 3, 4, 0, 2, 3, 2, 3, 1.
In this embodiment, the first predetermined temperature difference value is the maximum temperature difference value corresponding to the allowed operation of the element in the standard operating condition based on the current element performance of the PV element.
In this embodiment, a problem element is a PV element that has a fault problem.
In this embodiment, the list of faults refers to the list corresponding to different fault problems determined on the basis of different temperature difference values, for example, light spots corresponding to a temperature difference value of 2 degrees Celsius - 3 degrees Celsius and desoldering corresponding to a temperature difference value of 5 degrees Celsius - 6 degrees
Celsius.
The beneficial effect of the above technical solution is that by acquiring and comparing the surface temperature of the photovoltaic components in real time, thereby identifying problem components and examining the problems of the problem components, thereby identifying the problems and providing early warning, the temperature monitoring of the photovoltaic components can be made timely and accurate, thereby reducing the possibility of serious component failures and increasing the service life.
Example 8:
Based on Example 7, a problem determination unit, comprising; a fault classification subunit: for classifying the fault list based on the fault location, determining the maximum temperature difference value corresponding to the problem element within a predetermined element area; fault determination subunit: for determining the fault problem of the PV element corresponding to the current temperature difference value based on a comparison of said maximum temperature difference value with a temperature difference-fault criterion; LUS04189 fault warning subunit: for determining the corresponding fault number and fault level based on said fault problem and transmitting it to the intelligent management terminal for early warning and maintenance.
The fault location in this embodiment is the location where the PV element is faulty based on the number of the temperature sensor to determine the corresponding location and thus the location of the fault.
In this embodiment, the fault list refers to the list corresponding to different fault problems determined based on different temperature difference values, for example, the light spot corresponds to a temperature difference value of 2 degrees Celsius - 3 degrees Celsius, and the desoldering corresponds to a temperature difference value of 5 degrees Celsius - 6 degrees
Celsius.
In this embodiment, the preset element area is determined based on the total area of the photovoltaic element, e.g. if the total area of the photovoltaic element is 10 square meters, the preset element area is 1 square meter, and based on the area of the preset element, it is possible to determine the location of the element failure where the fault problem occurs.
The maximum temperature difference value in this embodiment is the maximum temperature difference value corresponding to the temperature data collected by the temperature sensor within the predetermined element area.
The temperature difference-fault criterion in this embodiment is a criterion for the temperature difference and the cause of the fault determined based on the fault results of all photovoltaic components in the database, e.g. a light spot corresponds to a temperature difference value of 2 degrees Celsius - 3 degrees Celsius and a desoldering corresponds to a temperature difference value of 5 degrees Celsius - 6 degrees Celsius.
In this embodiment, the fault problems include light spots, desoldering, etc.
The beneficial effect of the above technical solution is that by acquiring and comparing the surface temperature of the photovoltaic components in real time, thereby identifying problem components, and by analysing the problem components, identifying component failure problems and providing early warning of the problems, the temperature monitoring of the photovoltaic components can be made timely and accurate, thereby reducing the possibility of serious component failures and increasing the service life.
It is clear that a person skilled in the art can make various modifications and variations of the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their technical equivalents, the invention is also intended to include these modifications and variations.
LU504189

Claims (8)

CLAIMS LU504189
1. À system for monitoring the surface temperature of photovoltaic modules, characterized in that it comprises: a collection acquisition module: for acquiring a collection of historical temperature data for each photovoltaic element in the target photovoltaic module; a temperature determination module: for obtaining the maximum temperature at which each photovoltaic element in the target photovoltaic module is allowed to operate, in accordance with the device operating criteria and in combination with the set of historical temperature data; temperature acquisition module: for collecting the first temperature data of the corresponding photovoltaic element in real time based on the temperature sensors set on the surface of each photovoltaic element; problem component determination module: for comparing the first temperature data of the same PV element with the maximum temperature allowed to operate and determining the problem component; component problem verification module: for activating a backup temperature sensor of said problem component, for temperature collection verification and for determining the problem of the component.
2. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 1, characterised in that the collection acquisition module, comprising: a historical data acquisition unit: for acquiring historical temperature data for each photovoltaic element in the target photovoltaic module and acquiring historical element performance for the photovoltaic element corresponding to the historical temperature data; a historical data analysis unit: for analysing the corresponding historical temperature data based on a first temperature-performance criterion to obtain a collection of historical temperature data for each PV element; wherein a PV element corresponds to a collection of historical temperature data, and each collection of historical temperature data contains all valid historical temperature data for the same PV element, the corresponding historical element performance and the results of the analysis of the historical temperature data.
3. A system for monitoring the surface temperature of photovoltaic modules as claimed bY 904189 claim 2, characterized in that the temperature determination module, comprising: a performance screening unit: for determining whether a current photovoltaic component has experienced a component failure problem based on historical component performance;
temperature filtering unit: for obtaining the temperature data analysis results corresponding to the component with the component failure problem and determining whether the component failure problem is caused by a temperature abnormality; if the temperature data analysis results determine that it is not caused by a temperature abnormality;
If the temperature data analysis result is judged not to be caused by a temperature abnormality, the current historical temperature data, historical component performance and temperature data analysis result are rejected and the judgment is made again;
if the temperature data analysis result is judged to be caused by a temperature anomaly, extracting the corresponding historical temperature data; a collection determination unit: for constructing an abnormal temperature data collection based on said abnormal temperature historical temperature data and constructing a normal temperature data collection from the remaining historical temperature data;
comparing the historical temperature data in the abnormal temperature data set one by one to obtain the minimum abnormal temperature in the abnormal temperature data set as the first reference temperature;
comparing the historical temperature data in the normal temperature data collection one by one to obtain the maximum normal temperature in the normal temperature data collection as the second reference temperature;
a temperature determination unit: for determining whether the first reference temperature is greater than the second reference temperature;
if the first reference temperature is greater than the second reference temperature, the average value of the first reference temperature and the second reference temperature is calculated as the maximum temperature at which the PV element is currently allowed to operate;
Conversely, the first reference temperature is removed from the abnormal temperature data set and the second reference temperature is removed from the normal temperature data set, and the comparison is carried out again to determine the corrected first reference temperature and the corrected second reference temperature, and the comparison is judged again until the corrected 904189 first reference temperature is greater than the corrected second reference temperature to obtain the maximum temperature at which the current photovoltaic element is allowed to operate.
4. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 3, characterized in that the performance screening unit, comprising: if the photovoltaic module is not currently experiencing a component failure problem, screening all historical temperature data in the historical temperature data collection and comparing them to obtain a maximum value of said historical temperature data as the maximum reference temperature at which the photovoltaic module is currently allowed to operate, for transmission to the problem component determination module; if a component failure problem occurs, the corresponding historical temperature data and the results of the historical temperature data analysis are extracted and transmitted to the temperature screening unit.
5. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 1, characterized in that the temperature acquisition module, comprising: a data acquisition unit: for collecting temperature data for a number of areas on the surface of the photovoltaic element at the corresponding moment when the measured temperatures of the temperature sensors on the surface of the photovoltaic element are all above a preset temperature; a temperature difference determination unit: for comparing the collected temperature data one by one and determining the temperature difference value between each temperature data and the remaining temperature data; Comparison transmission unit: for comparing all temperature difference values, taking the maximum temperature difference value as the first temperature data of the current photovoltaic element and transmitting said first temperature data and the corresponding temperature sensor number to the problem element determination module.
6. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 4, characterized in that the problem element determination module, comprises: a temperature comparison unit: comparing the first temperature data of the current photovoltaic element with a maximum reference temperature if the current photovoltaic element has not had a component failure problem; 0506188 If the first temperature data is greater than the maximum reference temperature of the PV element, the current PV element is judged to be a possible problem element and the corresponding temperature sensor number is transmitted to the component problem inspection module; conversely, the current PV element is judged to be fault-free; if the current PV element has had a component failure problem, the first temperature data of the current PV element is compared with the maximum temperature data allowed to operate; If the first temperature data is greater than the maximum temperature data of the PV element, the current PV element is judged to be a problem component and the corresponding temperature sensor number is transmitted to the component problem inspection module; conversely, the current PV element is judged to be fault-free.
7. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 1, characterized in that the component problem inspection module, comprising: a number determination unit: for determining, based on the number of the temperature sensor, the number of the photovoltaic element with a component failure and a possible failure problem; data reacquisition unit: for activating the corresponding backup temperature sensor based on said photovoltaic element number and reacquiring temperature data for the current photovoltaic element in combination with the original temperature sensor to obtain a second temperature data; temperature difference judgement unit: for judging the temperature difference value between each temperature data in the second temperature data and the remaining temperature data based on the obtained second temperature data; if the temperature difference value is higher than the first preset temperature difference value, obtaining the corresponding temperature sensor number, determining the fault location of the problem element and constructing a corresponding fault list; Problem determination unit: for determining, based on the fault list, the problems existing in the photovoltaic element and transmitting to the intelligent management terminal for early warning.
8. A system for monitoring the surface temperature of photovoltaic modules as claimed in claim 6, characterized in that the problem determination unit, comprising: 7504769 a fault classification subunit: for classifying a fault list based on the fault location and determining the maximum temperature difference value corresponding to the problem element within a predetermined element area;
fault determination subunit: for determining the fault problem of the PV element corresponding to the current temperature difference value based on a comparison of said maximum temperature difference value with a temperature difference-fault criterion;
Fault warning subunit: for determining the corresponding fault number and fault level based on said fault problem and transmitting it to the intelligent management terminal for early warning and maintenance.
LU504189A 2023-04-04 2023-05-11 A system for monitoring the surface temperature of photovoltaic modules LU504189B1 (en)

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CN202310359258.XA CN116582085A (en) 2023-04-04 2023-04-04 Photovoltaic module surface temperature monitoring system

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LU504189B1 true LU504189B1 (en) 2023-11-14

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