CN117691947A - Solar photovoltaic panel generation power abnormality diagnosis method and system - Google Patents
Solar photovoltaic panel generation power abnormality diagnosis method and system Download PDFInfo
- Publication number
- CN117691947A CN117691947A CN202410148884.9A CN202410148884A CN117691947A CN 117691947 A CN117691947 A CN 117691947A CN 202410148884 A CN202410148884 A CN 202410148884A CN 117691947 A CN117691947 A CN 117691947A
- Authority
- CN
- China
- Prior art keywords
- power
- solar
- power station
- solar photovoltaic
- photovoltaic panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000005856 abnormality Effects 0.000 title claims abstract description 19
- 238000003745 diagnosis Methods 0.000 title claims description 13
- 238000010248 power generation Methods 0.000 claims abstract description 108
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- 230000002159 abnormal effect Effects 0.000 claims abstract description 47
- 238000013461 design Methods 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims description 40
- 238000012360 testing method Methods 0.000 claims description 24
- 238000005286 illumination Methods 0.000 claims description 18
- 238000012937 correction Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a method and a system for diagnosing abnormal power generation of a solar photovoltaic panel, which relate to the technical field of photovoltaic monitoring and comprise the following steps: obtaining design parameters and sunlight irradiance of a solar photovoltaic power station, calculating expected power generation and actual power generation of the solar photovoltaic power station, judging whether the actual power generation reaches the expected power generation, if yes, judging that no abnormality exists, if no, judging that abnormality exists, if abnormality exists, drawing a power station I-V curve graph based on the real-time actual power generation, determining power generation characteristic data in the power station I-V curve graph, calculating the photoelectric conversion efficiency of the solar photovoltaic power station, screening out solar photovoltaic panels with the photoelectric conversion efficiency lower than that of the power station based on the photoelectric conversion efficiency, and marking the solar panels as abnormal photovoltaic panels. The invention has the advantages that: the solar photovoltaic power station can help technicians to find problems in advance and maintain the problems, so that the performance and the power generation efficiency of the whole solar photovoltaic power station are improved, and meanwhile, the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic monitoring, in particular to a method and a system for diagnosing abnormal power generation of a solar photovoltaic panel.
Background
The diagnosis of abnormal power generated by the solar photovoltaic panel refers to the process of identifying and analyzing the cause of abnormal power generated in the solar photovoltaic power generation system. The process aims at timely finding out abnormal performance of the system, helping operators or maintenance personnel to quickly locate problems and take appropriate measures to ensure normal operation and maximum efficiency of the system.
The current mainstream diagnosis scheme is that a learning model is built by collecting operation data of power generation of a solar photovoltaic panel, so that the monitoring purpose is achieved, the method has higher requirements on data accuracy, and because the solar photovoltaic panel has more power generation influence factors, professional personnel are still required to maintain the collection equipment, the cost is higher, and a method for judging whether the solar photovoltaic panel assembly is abnormal or not only by single data is required.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provides a method and a system for diagnosing the abnormal power generation of a solar photovoltaic panel, and solves the problem that the method for judging whether the solar photovoltaic panel assembly is abnormal or not only needs single data.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a solar photovoltaic panel generation power abnormality diagnosis method and system comprises the following steps:
obtaining design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating the estimated power of the solar photovoltaic power station;
acquiring design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating actual power generation of the solar photovoltaic power station;
judging whether the actual power of the solar photovoltaic power station reaches the predicted power or not based on the predicted power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
if the solar photovoltaic power station is judged to be abnormal, drawing an I-V curve graph of the power station based on real-time actual power generation power of the solar photovoltaic power station, and determining power generation characteristic data in the I-V curve graph of the power station;
determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
based on the photoelectric conversion efficiency of the solar photovoltaic power station, the solar photovoltaic panel with the photoelectric conversion efficiency lower than that of the power station is screened out and marked as an abnormal photovoltaic panel.
Preferably, the obtaining the design parameter and the irradiance of sunlight of the solar photovoltaic power station, and the calculating the actual power of the solar photovoltaic power station specifically includes:
obtaining the output power and the designed rated capacity of a solar photovoltaic power station;
determining a solar radiation intensity ratio of the solar photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
determining a difference between the photovoltaic panel temperature and the photovoltaic panel temperature under standard test conditions based on the current solar photovoltaic panel temperature and the photovoltaic panel temperature under standard conditions;
calculating the actual power of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the solar radiation intensity ratio of the photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition;
the actual generated power calculation formula is as follows:，
in the method, in the process of the invention,for the actual power generation of the solar photovoltaic power station, < >>For the output power of the photovoltaic power generation system, +.>For the rated capacity of the photovoltaic system, +.>For the current solar radiation intensity ratio, +.>For the intensity of solar radiation under standard test conditions, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>Is the photovoltaic panel temperature under standard test conditions.
Preferably, if it is determined that the solar photovoltaic power plant is abnormal, drawing a power plant I-V graph based on real-time actual power generation of the solar photovoltaic power plant, and determining the power generation characteristic data in the power plant I-V graph specifically includes:
calculating short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
calculating an open-circuit voltage of the solar power station based on parameters in the power station I-V graph;
calculating a filling factor of the solar power plant based on parameters in the power plant I-V graph, an open-circuit voltage of the solar power plant and a short-circuit current of the solar power plant;
the short-circuit current of the solar power station is specifically as follows:，
in the method, in the process of the invention,for short-circuit current of solar power station, +.>For the solar radiation intensity of the solar photovoltaic panel, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>The temperature of the photovoltaic panel under standard test conditions;
the open-circuit voltage of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the open circuit voltage of a solar power plant, +.>Is Boltzmann constant, & gt>For the current photovoltaic panel temperature, +.>As a natural logarithmic function>For electron charge +.>Is reverse saturation current;
the filling factor of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the filling factor of a solar power station, +.>For the voltage of the solar power plant at the maximum power point,/->Is the current at the maximum power point of the solar power plant.
Preferably, determining the photoelectric conversion efficiency of the solar photovoltaic power plant based on the power generation characteristic data in the power plant I-V graph specifically includes:
determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
calculating photoelectric conversion efficiency of the solar power station based on maximum output power of the solar photovoltaic panel, illumination incident power, short circuit current of the solar power station, open circuit voltage of the solar power station and filling factor of the solar power station;
the photoelectric conversion efficiency of the solar power station is specifically as follows:，
in the method, in the process of the invention,for photoelectric conversion efficiency, +.>For maximum output power of the solar photovoltaic panel, < >>Is the illumination incident power.
Further, a system for diagnosing abnormal power generated by a solar photovoltaic panel is provided, which is used for implementing the method for diagnosing abnormal power generated by the solar photovoltaic panel, and comprises the following steps:
the estimated power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating estimated power generation of the solar photovoltaic power station;
the actual power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating actual power generation of the solar photovoltaic power station;
the judging module is electrically connected with the estimated power generation module and the actual power generation module, and is used for judging whether the actual power generation power of the solar photovoltaic power station reaches the estimated power generation power or not based on the estimated power generation power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
the power generation characteristic acquisition module is electrically connected with the judging module and is used for drawing a power station I-V curve graph based on real-time actual power generation power of the solar photovoltaic power station and determining power generation characteristic data in the power station I-V curve graph if the solar photovoltaic power station is judged to be abnormal;
the conversion efficiency calculation module is electrically connected with the power generation characteristic acquisition module and is used for determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
the screening module is electrically connected with the conversion efficiency calculation module and is used for screening out solar photovoltaic panels with the photoelectric conversion efficiency lower than that of the power station based on the photoelectric conversion efficiency of the solar photovoltaic power station and marking the solar photovoltaic panels as abnormal photovoltaic panels.
Optionally, the actual power generation module includes, inside:
the collecting unit is used for obtaining the output power and the designed rated capacity of the solar photovoltaic power station;
the solar energy photovoltaic panel comprises a radiation intensity acquisition unit, a control unit and a control unit, wherein the radiation intensity acquisition unit is used for determining the solar radiation intensity ratio of the solar energy photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
the temperature difference value acquisition unit is used for determining the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition based on the current temperature of the solar photovoltaic panel and the temperature of the photovoltaic panel under the standard condition;
the solar photovoltaic power generation system comprises a first calculation unit, a collection unit, a radiation intensity acquisition unit and a temperature difference acquisition unit, wherein the first calculation unit is used for calculating the actual power generation of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the sunlight radiation intensity ratio of a photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under standard test conditions.
Optionally, the power generation characteristic acquisition module internally includes:
the short-circuit current characteristic calculation unit is used for calculating the short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
an open-circuit voltage characteristic calculation unit for calculating an open-circuit voltage of the solar power plant based on parameters in the power plant I-V graph;
the filling factor characteristic calculation unit is electrically connected with the short-circuit current characteristic calculation unit and the open-circuit voltage characteristic calculation unit, and is used for calculating the filling factor of the solar power station based on parameters in the power station I-V curve graph, the open-circuit voltage of the solar power station and the short-circuit current of the solar power station.
Optionally, the conversion efficiency calculation module includes:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
the second calculation unit is electrically connected with the acquisition unit and is used for calculating the photoelectric conversion efficiency of the solar power station based on the maximum output power of the solar photovoltaic panel, the illumination incident power, the short circuit current of the solar power station, the open circuit voltage of the solar power station and the filling factor of the solar power station.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method and a system for diagnosing abnormal power generation of a solar photovoltaic panel. By collecting design parameters and real-time data of the solar photovoltaic power plant, the predicted generated power is calculated and compared with the actual generated power. If abnormality is found, the power generation characteristic data including open-circuit voltage, short-circuit current, filling factor and the like are analyzed by using the I-V curve graph, and photoelectric conversion efficiency is calculated. Finally, through the evaluation to efficiency, the unusual photovoltaic board that photoelectric conversion efficiency is less than average level is screened out, through this mode, can help the technicians to discover the problem in advance, maintain to improve whole solar photovoltaic power plant's performance and generating efficiency, reduce maintenance cost simultaneously.
Drawings
FIG. 1 is a flow chart of a method for diagnosing abnormal power generated by a solar photovoltaic panel;
FIG. 2 is a flow chart of a method for calculating the actual generated power of the solar power plant of the present invention;
FIG. 3 is a flow chart of a method of determining power generation signature data in a power plant I-V graph of the present invention;
FIG. 4 is a flow chart of a method of determining the photoelectric conversion efficiency of a solar photovoltaic power plant of the present invention;
fig. 5 is a frame diagram of a solar photovoltaic panel generation power abnormality diagnosis system according to the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, a method for diagnosing abnormal generated power of a solar photovoltaic panel includes:
obtaining design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating the estimated power of the solar photovoltaic power station;
acquiring design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating actual power generation of the solar photovoltaic power station;
judging whether the actual power of the solar photovoltaic power station reaches the predicted power or not based on the predicted power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
if the solar photovoltaic power station is judged to be abnormal, drawing an I-V curve graph of the power station based on real-time actual power generation power of the solar photovoltaic power station, and determining power generation characteristic data in the I-V curve graph of the power station;
determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
based on the photoelectric conversion efficiency of the solar photovoltaic power station, the solar photovoltaic panel with the photoelectric conversion efficiency lower than that of the power station is screened out and marked as an abnormal photovoltaic panel.
According to the scheme, the design parameters and real-time data of the solar photovoltaic power station are collected, and the expected power generation power is calculated and compared with the actual power generation power. If abnormality is found, the power generation characteristic data including open-circuit voltage, short-circuit current, filling factor and the like are analyzed by using the I-V curve graph, and photoelectric conversion efficiency is calculated. Finally, through the evaluation to efficiency, the unusual photovoltaic board that photoelectric conversion efficiency is less than average level is screened out, through this mode, can help the technicians to discover the problem in advance, maintain to improve whole solar photovoltaic power plant's performance and generating efficiency, reduce maintenance cost simultaneously.
Referring to fig. 2, obtaining design parameters and irradiance of sunlight of a solar photovoltaic power plant, calculating actual power generated by the solar photovoltaic power plant specifically includes:
obtaining the output power and the designed rated capacity of a solar photovoltaic power station;
determining a solar radiation intensity ratio of the solar photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
determining a difference between the photovoltaic panel temperature and the photovoltaic panel temperature under standard test conditions based on the current solar photovoltaic panel temperature and the photovoltaic panel temperature under standard conditions;
calculating the actual power of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the solar radiation intensity ratio of the photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition;
the actual generated power calculation formula is as follows:，
in the method, in the process of the invention,for the actual power generation of the solar photovoltaic power station, < >>Is the output power of the photovoltaic power generation system,for the rated capacity of the photovoltaic system, +.>For the current solar radiation intensity ratio, +.>For the intensity of solar radiation under standard test conditions, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>Is the photovoltaic panel temperature under standard test conditions.
According to the scheme, the sunlight irradiance under the current illumination condition and the temperature information of the photovoltaic panel are obtained by monitoring the output power and the design rated capacity of the solar photovoltaic power station. And comparing the solar radiation intensity and the photovoltaic panel temperature under the current environment condition and the standard test condition, and calculating to obtain the corresponding ratio and temperature difference. And finally, obtaining the actual power generation power of the solar photovoltaic power station under the current condition by using an actual power generation power calculation formula considering the factors. This approach helps to fully understand photovoltaic system performance and provides information for optimizing and assessing system efficiency.
Referring to fig. 3, if it is determined that there is an abnormality in the solar photovoltaic power plant, drawing a power plant I-V graph based on real-time actual power generation of the solar photovoltaic power plant, and determining power generation characteristic data in the power plant I-V graph specifically includes:
calculating short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
calculating an open-circuit voltage of the solar power station based on parameters in the power station I-V graph;
calculating a filling factor of the solar power plant based on parameters in the power plant I-V graph, an open-circuit voltage of the solar power plant and a short-circuit current of the solar power plant;
the short-circuit current of the solar power station is specifically as follows:，
in the method, in the process of the invention,for short-circuit current of solar power station, +.>For the solar radiation intensity of the solar photovoltaic panel, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>The temperature of the photovoltaic panel under standard test conditions;
the open-circuit voltage of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the open circuit voltage of a solar power plant, +.>Is Boltzmann constant, & gt>For the current photovoltaic panel temperature, +.>As a natural logarithmic function>For electron charge +.>Is reverse saturation current;
the filling factor of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the filling factor of a solar power station, +.>For the voltage of the solar power plant at the maximum power point,/->Is the current at the maximum power point of the solar power plant.
According to the scheme, an I-V curve graph is drawn, power parameters in the graph are obtained, relevant power characteristics are calculated, and the short-circuit current is the maximum current generated by the photovoltaic module when the open-circuit voltage is zero. It reflects the current output capability of the photovoltaic module in the short-circuit state. The open circuit voltage is the maximum voltage produced by the photovoltaic module when the current is zero. Which represents the voltage output capability of the photovoltaic module. The fill factor is the ratio between the actual output power and the theoretical maximum output power in the power station I-V graph. It is a comprehensive index describing the current-voltage characteristics of the photovoltaic module. The fill factor is calculated using the short circuit current, the open circuit voltage, and the current and voltage values of the maximum power point. By measuring these parameters, the performance of the photovoltaic module can be understood in depth.
Referring to fig. 4, determining the photoelectric conversion efficiency of the solar photovoltaic power plant based on the power generation characteristic data in the power plant I-V graph specifically includes:
determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
calculating photoelectric conversion efficiency of the solar power station based on maximum output power of the solar photovoltaic panel, illumination incident power, short circuit current of the solar power station, open circuit voltage of the solar power station and filling factor of the solar power station;
the photoelectric conversion efficiency of the solar power station is specifically as follows:，
in the method, in the process of the invention,for photoelectric conversion efficiency, +.>For maximum output power of the solar photovoltaic panel, < >>Is the illumination incident power.
According to the scheme, the maximum output power of the solar photovoltaic panel is determined by observing an I-V curve graph of the solar photovoltaic panel, and the illumination incident power is measured to calculate the photoelectric conversion efficiency of the solar power station. Meanwhile, open-circuit voltage, short-circuit current and filling factors are added to obtain more comprehensive performance evaluation of the photovoltaic system, so that operators can know the running condition of the system, find problems in time and take optimization and maintenance measures to improve the overall efficiency and reliability of the power station.
Further, referring to fig. 5, based on the same inventive concept as the above-described method for diagnosing abnormal power generated by a solar photovoltaic panel, a system for diagnosing abnormal power generated by a solar photovoltaic panel is provided, comprising:
the estimated power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating estimated power generation of the solar photovoltaic power station;
the actual power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating actual power generation of the solar photovoltaic power station;
the judging module is electrically connected with the estimated power generation module and the actual power generation module, and is used for judging whether the actual power generation power of the solar photovoltaic power station reaches the estimated power generation power or not based on the estimated power generation power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
the power generation characteristic acquisition module is electrically connected with the judging module and is used for drawing a power station I-V curve graph based on real-time actual power generation power of the solar photovoltaic power station and determining power generation characteristic data in the power station I-V curve graph if the solar photovoltaic power station is judged to be abnormal;
the conversion efficiency calculation module is electrically connected with the power generation characteristic acquisition module and is used for determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
the screening module is electrically connected with the conversion efficiency calculation module and is used for screening out solar photovoltaic panels with the photoelectric conversion efficiency lower than that of the power station based on the photoelectric conversion efficiency of the solar photovoltaic power station and marking the solar photovoltaic panels as abnormal photovoltaic panels.
The actual power generation module comprises:
the collecting unit is used for obtaining the output power and the designed rated capacity of the solar photovoltaic power station;
the solar energy photovoltaic panel comprises a radiation intensity acquisition unit, a control unit and a control unit, wherein the radiation intensity acquisition unit is used for determining the solar radiation intensity ratio of the solar energy photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
the temperature difference value acquisition unit is used for determining the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition based on the current temperature of the solar photovoltaic panel and the temperature of the photovoltaic panel under the standard condition;
the solar photovoltaic power generation system comprises a first calculation unit, a collection unit, a radiation intensity acquisition unit and a temperature difference acquisition unit, wherein the first calculation unit is used for calculating the actual power generation of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the sunlight radiation intensity ratio of a photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under standard test conditions.
The power generation characteristic acquisition module internally comprises:
the short-circuit current characteristic calculation unit is used for calculating the short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
an open-circuit voltage characteristic calculation unit for calculating an open-circuit voltage of the solar power plant based on parameters in the power plant I-V graph;
the filling factor characteristic calculation unit is electrically connected with the short-circuit current characteristic calculation unit and the open-circuit voltage characteristic calculation unit, and is used for calculating the filling factor of the solar power station based on parameters in the power station I-V curve graph, the open-circuit voltage of the solar power station and the short-circuit current of the solar power station.
The conversion efficiency calculation module internally comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
the second calculation unit is electrically connected with the acquisition unit and is used for calculating the photoelectric conversion efficiency of the solar power station based on the maximum output power of the solar photovoltaic panel, the illumination incident power, the short circuit current of the solar power station, the open circuit voltage of the solar power station and the filling factor of the solar power station.
The use process of the solar photovoltaic panel generation power abnormality diagnosis system is as follows:
step one: obtaining design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating the estimated power of the solar photovoltaic power station;
step two: obtaining the output power and the designed rated capacity of a solar photovoltaic power station;
step three: determining a solar radiation intensity ratio of the solar photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
step four: determining a difference between the photovoltaic panel temperature and the photovoltaic panel temperature under standard test conditions based on the current solar photovoltaic panel temperature and the photovoltaic panel temperature under standard conditions;
step five: calculating the actual power of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the solar radiation intensity ratio of the photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition;
step six: judging whether the actual power of the solar photovoltaic power station reaches the predicted power or not based on the predicted power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
step seven: calculating short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
step eight: calculating an open-circuit voltage of the solar power station based on parameters in the power station I-V graph;
step nine: the fill factor of the solar power plant is calculated based on parameters in the power plant I-V graph, the open circuit voltage of the solar power plant, and the short circuit current of the solar power plant.
Step ten: determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
step eleven: calculating photoelectric conversion efficiency of the solar power station based on maximum output power of the solar photovoltaic panel, illumination incident power, short circuit current of the solar power station, open circuit voltage of the solar power station and filling factor of the solar power station;
step twelve: based on the photoelectric conversion efficiency of the solar photovoltaic power station, the solar photovoltaic panel with the photoelectric conversion efficiency lower than that of the power station is screened out and marked as an abnormal photovoltaic panel.
In summary, the invention has the advantages that: according to the scheme, the design parameters and real-time data of the solar photovoltaic power station are collected, and the expected power generation power is calculated and compared with the actual power generation power. If abnormality is found, the power generation characteristic data including open-circuit voltage, short-circuit current, filling factor and the like are analyzed by using the I-V curve graph, and photoelectric conversion efficiency is calculated. Finally, through the evaluation to efficiency, the unusual photovoltaic board that photoelectric conversion efficiency is less than average level is screened out, through this mode, can help the technicians to discover the problem in advance, maintain to improve whole solar photovoltaic power plant's performance and generating efficiency, reduce maintenance cost simultaneously.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The solar photovoltaic panel generation power abnormality diagnosis method is characterized by comprising the following steps of:
obtaining design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating the estimated power of the solar photovoltaic power station;
acquiring design parameters and sunlight irradiance of a solar photovoltaic power station, and calculating actual power generation of the solar photovoltaic power station;
judging whether the actual power of the solar photovoltaic power station reaches the predicted power or not based on the predicted power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
if the solar photovoltaic power station is judged to be abnormal, drawing an I-V curve graph of the power station based on real-time actual power generation power of the solar photovoltaic power station, and determining power generation characteristic data in the I-V curve graph of the power station;
determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
based on the photoelectric conversion efficiency of the solar photovoltaic power station, the solar photovoltaic panel with the photoelectric conversion efficiency lower than that of the power station is screened out and marked as an abnormal photovoltaic panel.
2. The method for diagnosing abnormal power generated by a solar photovoltaic panel according to claim 1, wherein obtaining the design parameters and irradiance of sunlight of the solar photovoltaic power plant, calculating the actual power generated by the solar photovoltaic power plant comprises:
obtaining the output power and the designed rated capacity of a solar photovoltaic power station;
determining a solar radiation intensity ratio of the solar photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
determining a difference between the photovoltaic panel temperature and the photovoltaic panel temperature under standard test conditions based on the current solar photovoltaic panel temperature and the photovoltaic panel temperature under standard conditions;
calculating the actual power of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the solar radiation intensity ratio of the photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition;
the actual generated power calculation formula is as follows:，
in the method, in the process of the invention,for the actual power generation of the solar photovoltaic power station, < >>For the output power of the photovoltaic power generation system, +.>For the rated capacity of the photovoltaic system, +.>For the current solar radiation intensity ratio, +.>For the intensity of solar radiation under standard test conditions, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>Is the photovoltaic panel temperature under standard test conditions.
3. The method for diagnosing abnormal power generated by a solar photovoltaic panel according to claim 2, wherein if it is determined that the solar photovoltaic power plant is abnormal, drawing a power plant I-V graph based on real-time actual power generated by the solar photovoltaic power plant, and determining power generation characteristic data in the power plant I-V graph specifically comprises:
calculating short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
calculating an open-circuit voltage of the solar power station based on parameters in the power station I-V graph;
calculating a filling factor of the solar power plant based on parameters in the power plant I-V graph, an open-circuit voltage of the solar power plant and a short-circuit current of the solar power plant;
the short-circuit current of the solar power station is specifically as follows:，
in the method, in the process of the invention,for short-circuit current of solar power station, +.>For the solar radiation intensity of the solar photovoltaic panel, < >>Correction factor for temperature influence->For the current photovoltaic panel temperature, +.>The temperature of the photovoltaic panel under standard test conditions;
the open-circuit voltage of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the open circuit voltage of a solar power plant, +.>Is Boltzmann constant, & gt>For the current temperature of the photovoltaic panel,as a natural logarithmic function>For electron charge +.>Is reverse saturation current;
the filling factor of the solar power station is specifically as follows:，
in the method, in the process of the invention,for the filling factor of a solar power station, +.>For the voltage of the solar power plant at the maximum power point,is the current at the maximum power point of the solar power plant.
4. A method for diagnosing a solar photovoltaic panel generated power abnormality as claimed in claim 3, wherein determining the photoelectric conversion efficiency of the solar photovoltaic power plant based on the generated characteristic data in the power plant I-V graph specifically comprises:
determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
calculating photoelectric conversion efficiency of the solar power station based on maximum output power of the solar photovoltaic panel, illumination incident power, short circuit current of the solar power station, open circuit voltage of the solar power station and filling factor of the solar power station;
the photoelectric conversion efficiency of the solar power station is specifically as follows:，
in the method, in the process of the invention,for photoelectric conversion efficiency, +.>For maximum output power of the solar photovoltaic panel, < >>The incident power is illuminated.
5. A solar photovoltaic panel generated power abnormality diagnosis system for implementing a solar photovoltaic panel generated power abnormality diagnosis method according to any one of claims 1 to 4, characterized by comprising:
the estimated power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating estimated power generation of the solar photovoltaic power station;
the actual power generation module is used for acquiring design parameters and sunlight irradiance of the solar photovoltaic power station and calculating actual power generation of the solar photovoltaic power station;
the judging module is electrically connected with the estimated power generation module and the actual power generation module, and is used for judging whether the actual power generation power of the solar photovoltaic power station reaches the estimated power generation power or not based on the estimated power generation power of the solar photovoltaic power station, if so, judging that the solar photovoltaic power station is abnormal, and if not, judging that the solar photovoltaic power station is abnormal;
the power generation characteristic acquisition module is electrically connected with the judging module and is used for drawing a power station I-V curve graph based on real-time actual power generation power of the solar photovoltaic power station and determining power generation characteristic data in the power station I-V curve graph if the solar photovoltaic power station is judged to be abnormal;
the conversion efficiency calculation module is electrically connected with the power generation characteristic acquisition module and is used for determining the photoelectric conversion efficiency of the solar photovoltaic power station based on the power generation characteristic data in the power station I-V curve graph;
the screening module is electrically connected with the conversion efficiency calculation module and is used for screening out solar photovoltaic panels with the photoelectric conversion efficiency lower than that of the power station based on the photoelectric conversion efficiency of the solar photovoltaic power station and marking the solar photovoltaic panels as abnormal photovoltaic panels.
6. The solar photovoltaic panel generation power abnormality diagnosis system according to claim 5, wherein the actual generation module includes inside:
the collecting unit is used for obtaining the output power and the designed rated capacity of the solar photovoltaic power station;
the solar energy photovoltaic panel comprises a radiation intensity acquisition unit, a control unit and a control unit, wherein the radiation intensity acquisition unit is used for determining the solar radiation intensity ratio of the solar energy photovoltaic panel based on the current solar irradiance and the solar radiation intensity under the standard condition;
the temperature difference value acquisition unit is used for determining the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under the standard test condition based on the current temperature of the solar photovoltaic panel and the temperature of the photovoltaic panel under the standard condition;
the solar photovoltaic power generation system comprises a first calculation unit, a collection unit, a radiation intensity acquisition unit and a temperature difference acquisition unit, wherein the first calculation unit is used for calculating the actual power generation of the solar photovoltaic power station through an actual power generation power calculation formula based on the design rated capacity of the solar photovoltaic power station, the sunlight radiation intensity ratio of a photovoltaic panel and the difference between the temperature of the photovoltaic panel and the temperature of the photovoltaic panel under standard test conditions.
7. The solar photovoltaic panel generated power abnormality diagnosis system according to claim 5, wherein the generated power feature acquisition module internally includes:
the short-circuit current characteristic calculation unit is used for calculating the short-circuit current of the solar power station based on parameters in the I-V curve graph of the power station;
an open-circuit voltage characteristic calculation unit for calculating an open-circuit voltage of the solar power plant based on parameters in the power plant I-V graph;
the filling factor characteristic calculation unit is electrically connected with the short-circuit current characteristic calculation unit and the open-circuit voltage characteristic calculation unit, and is used for calculating the filling factor of the solar power station based on parameters in the power station I-V curve graph, the open-circuit voltage of the solar power station and the short-circuit current of the solar power station.
8. The solar photovoltaic panel generation power abnormality diagnosis system according to claim 5, wherein the conversion efficiency calculation module internally includes:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for determining the maximum output power and illumination incident power of a solar photovoltaic panel in a solar photovoltaic power station;
the second calculation unit is electrically connected with the acquisition unit and is used for calculating the photoelectric conversion efficiency of the solar power station based on the maximum output power of the solar photovoltaic panel, the illumination incident power, the short circuit current of the solar power station, the open circuit voltage of the solar power station and the filling factor of the solar power station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410148884.9A CN117691947A (en) | 2024-02-02 | 2024-02-02 | Solar photovoltaic panel generation power abnormality diagnosis method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410148884.9A CN117691947A (en) | 2024-02-02 | 2024-02-02 | Solar photovoltaic panel generation power abnormality diagnosis method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117691947A true CN117691947A (en) | 2024-03-12 |
Family
ID=90139421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410148884.9A Pending CN117691947A (en) | 2024-02-02 | 2024-02-02 | Solar photovoltaic panel generation power abnormality diagnosis method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117691947A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015159190A (en) * | 2014-02-24 | 2015-09-03 | 三菱電機株式会社 | Photovoltaic power generation diagnosis system |
| CN111614317A (en) * | 2020-05-12 | 2020-09-01 | 国家电投集团江西电力有限公司 | IV curve scanning-based diagnosis method for shadow shielding of photovoltaic panel |
| CN113839618A (en) * | 2021-10-15 | 2021-12-24 | 李力洋 | Real-time fault detection method for large grid-connected solar photovoltaic power station |
| CN114243795A (en) * | 2021-11-16 | 2022-03-25 | 国网辽宁省电力有限公司经济技术研究院 | Comprehensive energy collaborative interaction optimization configuration method and system for typical charging station |
| CN115149647A (en) * | 2022-07-12 | 2022-10-04 | 蚌埠阿米拉网络信息咨询有限公司 | Intelligent energy storage system based on light energy power generation |
| CN115333161A (en) * | 2022-09-14 | 2022-11-11 | 郭栋 | Capacity optimization configuration method for power supply system of green water plant |
-
2024
- 2024-02-02 CN CN202410148884.9A patent/CN117691947A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015159190A (en) * | 2014-02-24 | 2015-09-03 | 三菱電機株式会社 | Photovoltaic power generation diagnosis system |
| CN111614317A (en) * | 2020-05-12 | 2020-09-01 | 国家电投集团江西电力有限公司 | IV curve scanning-based diagnosis method for shadow shielding of photovoltaic panel |
| CN113839618A (en) * | 2021-10-15 | 2021-12-24 | 李力洋 | Real-time fault detection method for large grid-connected solar photovoltaic power station |
| CN114243795A (en) * | 2021-11-16 | 2022-03-25 | 国网辽宁省电力有限公司经济技术研究院 | Comprehensive energy collaborative interaction optimization configuration method and system for typical charging station |
| CN115149647A (en) * | 2022-07-12 | 2022-10-04 | 蚌埠阿米拉网络信息咨询有限公司 | Intelligent energy storage system based on light energy power generation |
| CN115333161A (en) * | 2022-09-14 | 2022-11-11 | 郭栋 | Capacity optimization configuration method for power supply system of green water plant |
Non-Patent Citations (2)
| Title |
|---|
| 李熊: "《有机聚合物太阳能电池：活性层、界面》", 31 August 2021, pages: 11 - 16 * |
| 潘小勇、马道胜: "《新能源技术》", 30 November 2019, pages: 110 - 116 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI586066B (en) | Solar power generation monitoring method and the solar power generation monitoring system used in the method | |
| CN111245365B (en) | Photovoltaic module fault diagnosis method based on dynamic weighted depth forest | |
| CN106130480B (en) | A kind of photovoltaic module outdoor generating characteristic and decay situation test system | |
| CN107451600B (en) | Online photovoltaic hot spot fault detection method based on isolation mechanism | |
| CN106368908A (en) | Wind turbine generator set power curve testing method based on SCADA (supervisory control and data acquisition) system | |
| CN113037214B (en) | Photovoltaic module shadow shielding fault diagnosis method based on S-V curve | |
| CN106899268A (en) | Multichannel photovoltaic module outdoor generating characteristic and grid-connected decay situation test system | |
| CN112003564B (en) | Distributed photovoltaic system branch power abnormity early warning method based on intelligent terminal | |
| CN110455827A (en) | A kind of smart new energy solar panel qualification detection system and method | |
| JP2012138448A (en) | Output drop detector and detection method of photovoltaic power generation | |
| CN116865669A (en) | Distributed photovoltaic fault detection system | |
| CN115189647A (en) | Photovoltaic array fault positioning method based on sensor detection method | |
| CN116800172B (en) | Photoelectric conversion method and energy storage system | |
| KR101664953B1 (en) | Diagnosis system of photovoltaic module | |
| Ren et al. | Machine learning applications in health monitoring of renewable energy systems | |
| CN117743794A (en) | Distributed photovoltaic power station fault diagnosis and efficiency loss evaluation system | |
| CN117691947A (en) | Solar photovoltaic panel generation power abnormality diagnosis method and system | |
| CN111894814A (en) | Fault processing system and method for power generation system | |
| CN108322186B (en) | Photovoltaic system fault monitoring method and system | |
| KR101402587B1 (en) | Apparatus for diagnosing failure of photovoltaic string using diagnostic load | |
| CN206948262U (en) | Multichannel photovoltaic module outdoor generating characteristic and grid-connected decay situation test system | |
| CN114595989A (en) | Wind turbine generator performance evaluation method and device | |
| CN107508549B (en) | PID attenuation detection method for string | |
| Elgamal et al. | Performance Metrics for Photovoltaic 4.0 Systems: 27.5 kW Solar Station as an Example | |
| CN114826151A (en) | Sorting method for improving solar cell light and shade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |