CN117405975A - Method, system and medium for detecting insulation resistance of PV panel - Google Patents
Method, system and medium for detecting insulation resistance of PV panel Download PDFInfo
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- CN117405975A CN117405975A CN202311717792.XA CN202311717792A CN117405975A CN 117405975 A CN117405975 A CN 117405975A CN 202311717792 A CN202311717792 A CN 202311717792A CN 117405975 A CN117405975 A CN 117405975A
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- 238000009413 insulation Methods 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000007781 pre-processing Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 16
- 238000005457 optimization Methods 0.000 claims description 8
- 230000008030 elimination Effects 0.000 claims description 6
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 238000009499 grossing Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The application provides a method, a system and a medium for detecting insulation resistance of a PV panel, wherein the method comprises the following steps: acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information; acquiring current information of the PV panel, and matching the current information with optimized voltage information; calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information; comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate; generating an insulation grade of the PV panel according to the resistance deviation rate, and applying the PV panel to different scenes to obtain associated information; transmitting the associated information matched with the application scene to the terminal; and calculating insulation resistance according to the voltage information and the current information of the PV panel, and calculating the insulation grade of the PV panel according to the insulation resistance, so that the PV panels with different insulation grades are applied to different scenes, and the use flexibility of the PV panel is improved.
Description
Technical Field
The application relates to the field of PV solar panels, in particular to a method, a system and a medium for detecting insulation resistance of a PV panel.
Background
PV solar panels are an important source of electrical power. PV panel arrays range in size from tens of panels to thousands of PV panels are becoming increasingly common. Typical PV panels are organized as a series connection of individual PV cells. A common configuration is 72 PV cells per panel. The operating voltage of a typical PV cell in a fully illuminated case is about 0.7V. An illuminated PV panel with 72 Direct Current (DC) PV cells would therefore have an output voltage of about 50 volts DC. PV panels are typically connected in series to form a "panel string". The output of the string of PV panels may be connected to an inverter that converts the DC power of the PV panels to Alternating Current (AC) power suitable for the grid. Under the general condition, a combined string voltage of hundreds of volts is generated between five to twenty PV panels in a panel string, the existing PV panels cannot judge the insulation grade according to different insulation resistances in the use process, the PV panels with different insulation grades are difficult to flexibly apply to different scenes, and the use flexibility is poor; in view of the above problems, an effective technical solution is currently needed.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method, a system, and a medium for detecting insulation resistance of a PV panel, which calculate insulation resistance through voltage information and current information of the PV panel, and calculate insulation grades of the PV panel according to the insulation resistance, so that PV panels with different insulation grades are applied in different scenes, and use flexibility of the PV panel is improved.
The embodiment of the application also provides a method for detecting the insulation resistance of the PV panel, which comprises the following steps:
acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
acquiring current information of the PV panel, and matching the current information with the optimized voltage information;
calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
Optionally, in the method for detecting insulation resistance of a PV panel according to the embodiment of the present application, the method includes obtaining voltage information of the PV panel, preprocessing the voltage information to obtain optimized voltage information, and specifically includes:
acquiring PV panel voltage information of different time nodes, and extracting voltage characteristics;
comparing the voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, eliminating the corresponding voltage characteristic, and re-fitting the remaining voltage characteristic to obtain the voltage information of the PV panel;
if the characteristic deviation rate is smaller than the first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
Optionally, in the method for detecting insulation resistance of a PV panel according to the embodiment of the present application, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain optimized voltage information, which specifically includes:
acquiring voltage information of a PV panel, and extracting voltage characteristics;
comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
removing noise characteristics, fitting the remaining voltage characteristics, and generating a time curve of voltage information;
analyzing the slope of the curve according to the time curve;
judging whether the slope of the curve is larger than or equal to a preset slope threshold value or not;
if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
Optionally, in the method for detecting insulation resistance of a PV panel according to the embodiment of the present application, after obtaining current information of the PV panel and matching the current information with optimized voltage information, the method further includes:
acquiring current information of the PV panel, and performing node matching on the current information and the voltage information at the same time to obtain a matching result;
judging whether the matching result meets the requirement;
if the requirements are met, dividing the same time node voltage information by the current information to obtain impedance information, and generating an insulation resistor according to the impedance information;
and if the voltage information or the current information does not meet the requirements, adjusting the voltage optimization parameters or the current optimization parameters to optimally compensate the voltage information or the current information.
Optionally, in the method for detecting insulation resistance of a PV panel according to the embodiment of the present application, insulation levels of the PV panel are generated according to the resistance deviation rate, and application scenes of the PV panel are generated according to different insulation levels, so as to obtain the associated information, which specifically includes:
acquiring the insulation grade of the PV panel, and comparing the insulation grade with a preset grade;
if the insulation grade is greater than a preset grade, generating a first application scene, and according to first scene information of a first application field Jing Shengcheng;
if the insulation level is smaller than or equal to the preset value, generating a second application scene, and generating second scene information according to the second application scene;
and performing similarity calculation on the first scene information and the second scene information, and switching the first application scene and the second application scene according to a calculation result.
Optionally, in the method for detecting insulation resistance of a PV panel according to the embodiment of the present application, insulation levels of the PV panel are generated according to the resistance deviation rate, and application scenes of the PV panel are generated according to different insulation levels, so as to obtain the associated information, which specifically includes:
acquiring the insulation grade of the PV panel, and matching different application scenes according to the insulation grade of the PV panel;
acquiring characteristics of different application scenes and calculating associated characteristics;
analyzing the association degree of the application scene according to the association characteristics;
if the association degree of the application scene is larger than a preset association degree threshold, fusing the application scene and repartitioning the insulation grade of the PV panel;
if the association degree of the application scene is smaller than a preset association degree threshold, the insulation grade of the PV panel is matched with the application scene, and the matching result is transmitted to the terminal.
In a second aspect, embodiments of the present application provide a PV panel insulation resistance detection system, the system comprising: the memory comprises a program of a PV panel insulation resistance detection method, and the program of the PV panel insulation resistance detection method realizes the following steps when being executed by the processor:
acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
acquiring current information of the PV panel, and matching the current information with the optimized voltage information;
calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
Optionally, in the PV panel insulation resistance detection system according to the embodiment of the present application, the method includes obtaining PV panel voltage information, preprocessing the voltage information to obtain optimized voltage information, and specifically includes:
acquiring PV panel voltage information of different time nodes, and extracting voltage characteristics;
comparing the voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, eliminating the corresponding voltage characteristic, and re-fitting the remaining voltage characteristic to obtain the voltage information of the PV panel;
if the characteristic deviation rate is smaller than the first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
Optionally, in the PV panel insulation resistance detection system described in the embodiments of the present application, PV panel voltage information is obtained, and the voltage information is preprocessed to obtain optimized voltage information, which specifically includes:
acquiring voltage information of a PV panel, and extracting voltage characteristics;
comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
removing noise characteristics, fitting the remaining voltage characteristics, and generating a time curve of voltage information;
analyzing the slope of the curve according to the time curve;
judging whether the slope of the curve is larger than or equal to a preset slope threshold value or not;
if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
In a third aspect, embodiments of the present application further provide a computer readable storage medium, where a program for detecting insulation resistance of a PV panel is included, where the program for detecting insulation resistance of a PV panel, when executed by a processor, implements the steps of the method for detecting insulation resistance of a PV panel according to any one of the above.
As can be seen from the above, according to the method, the system and the medium for detecting the insulation resistance of the PV panel provided by the embodiments of the present application, the voltage information is preprocessed by obtaining the voltage information of the PV panel, so as to obtain the optimized voltage information; acquiring current information of the PV panel, and matching the current information with the optimized voltage information; calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information; comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate; generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information; transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode; and calculating insulation resistance according to the voltage information and the current information of the PV panel, and calculating the insulation grade of the PV panel according to the insulation resistance, so that the PV panels with different insulation grades are applied to different scenes, and the use flexibility of the PV panel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting insulation resistance of a PV panel according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a voltage information optimizing method of the PV panel insulation resistance detecting method according to the embodiment of the present application;
fig. 3 is a flowchart of a voltage characteristic rejecting method of the PV panel insulation resistance detecting method according to the embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting insulation resistance of a PV panel according to some embodiments of the present application. The method for detecting the insulation resistance of the PV panel is used in terminal equipment and comprises the following steps:
s101, acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
s102, acquiring current information of a PV panel, and matching the current information with optimized voltage information;
s103, calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
s104, comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
s105, generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and S106, transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
The resistance information is calculated according to the voltage information and the current information of the PV panel, and the insulation grade corresponding to the resistance is judged according to the resistance information, so that the PV panel can be applied to different scenes by different insulation grades, and the insulation effect of the PV panel is improved.
Referring to fig. 2, fig. 2 is a flowchart of a voltage information optimizing method of a method for detecting insulation resistance of a PV panel according to some embodiments of the present application. According to the embodiment of the invention, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, which comprises the following steps:
s201, PV panel voltage information of different time nodes is obtained, and voltage characteristics are extracted;
s202, comparing voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
s203, if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
s204, if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, removing the corresponding voltage characteristic, and re-fitting the rest voltage characteristic to obtain the voltage information of the PV panel;
s205, if the characteristic deviation rate is smaller than a first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
The voltage characteristics of the PV panel are analyzed and compared, the voltage characteristics with larger deviation are removed, the voltage precision of the PV panel is improved, and the removed voltage characteristics are fitted, so that the voltage characteristics can better reflect the voltage change of the PV panel.
Referring to fig. 3, fig. 3 is a flowchart of a voltage characteristic eliminating method of a method for detecting insulation resistance of a PV panel according to some embodiments of the present application. According to the embodiment of the invention, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, specifically:
s301, acquiring voltage information of a PV panel and extracting voltage characteristics;
s302, comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
s303, eliminating noise characteristics, fitting residual voltage characteristics, and generating a time curve of voltage information;
s304, analyzing the slope of the curve according to the time curve, and judging whether the slope of the curve is larger than or equal to a preset slope threshold;
s305, if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and S306, if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
The voltage curve is analyzed, the slope is calculated, the voltage information is optimized according to the voltage curve, and the calculation accuracy of the insulation resistance is improved.
According to the embodiment of the invention, after the current information of the PV panel is obtained and the current information is matched with the optimized voltage information, the method further comprises the following steps:
acquiring current information of the PV panel, and performing node matching on the current information and the voltage information at the same time to obtain a matching result;
judging whether the matching result meets the requirement;
if the requirements are met, dividing the same time node voltage information by the current information to obtain impedance information, and generating an insulation resistor according to the impedance information;
and if the voltage information or the current information does not meet the requirements, adjusting the voltage optimization parameters or the current optimization parameters to optimally compensate the voltage information or the current information.
It should be noted that the voltage information and the current information of the same time node are matched, so that the insulation resistance information of the corresponding time node can be accurately calculated, and the PV panel is flexibly applied.
According to the embodiment of the invention, the insulation grades of the PV panel are generated according to the resistance deviation rate, and the application scene of the PV panel is generated according to different insulation grades, so that the related information is obtained, and the method specifically comprises the following steps:
acquiring the insulation grade of the PV panel, and comparing the insulation grade with a preset grade;
if the insulation grade is greater than a preset grade, generating a first application scene, and according to first scene information of a first application field Jing Shengcheng;
if the insulation level is smaller than or equal to the preset value, generating a second application scene, and generating second scene information according to the second application scene;
and performing similarity calculation on the first scene information and the second scene information, and switching the first application scene and the second application scene according to a calculation result.
It should be noted that, matching different application scenes according to different insulation grades, analyzing the similarity of different application scenes, and flexibly switching different scenes, so that the current use condition of the PV panel can be analyzed in real time when the insulation resistance changes.
According to the embodiment of the invention, the insulation grades of the PV panel are generated according to the resistance deviation rate, and the application scene of the PV panel is generated according to different insulation grades, so that the related information is obtained, and the method specifically comprises the following steps:
acquiring the insulation grade of the PV panel, and matching different application scenes according to the insulation grade of the PV panel;
acquiring characteristics of different application scenes and calculating associated characteristics;
analyzing the association degree of the application scene according to the association characteristics;
if the association degree of the application scene is larger than a preset association degree threshold, fusing the application scene and repartitioning the insulation grade of the PV panel;
if the association degree of the application scene is smaller than a preset association degree threshold, the insulation grade of the PV panel is matched with the application scene, and the matching result is transmitted to the terminal.
It should be noted that, by analyzing the association degree of different application scenes and fusing the application scenes according to the association degree, the insulation grade division precision is improved.
According to an embodiment of the present invention, further comprising:
acquiring temperature information and humidity information of a PV panel, and establishing a first relation curve of the temperature information and insulation resistance according to the temperature information;
establishing a second relation curve of the humidity information and the insulation resistance according to the humidity information;
calculating first interference information of the PV panel according to the first relation curve, and calculating second interference information of the PV panel according to the second relation curve;
comparing the first interference information with the second interference information to generate interference degree;
generating a first interference coefficient and a second interference coefficient according to the interference degree;
multiplying the first interference coefficient by insulation resistance information under the first interference information to obtain first optimized resistance information;
multiplying the second interference coefficient by insulation resistance information under the second interference information to obtain second optimized resistance information;
and fusing the first optimized resistance information and the second optimized resistance information to obtain final insulation resistance information.
It should be noted that, the temperature and humidity of the PV panel can all influence the insulation resistance to different degrees, and the interference of temperature and humidity to the insulation resistance is judged through the influence of analysis temperature and humidity, so that the insulation resistance information under the accurate analysis temperature or humidity interference is improved, and the detection precision of the insulation resistance is improved.
In a second aspect, embodiments of the present application provide a PV panel insulation resistance detection system, the system comprising: the memory and the processor, the memory includes the program of the PV panel insulation resistance detection method, the program of the PV panel insulation resistance detection method is executed by the processor to realize the following steps:
acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
acquiring current information of the PV panel, and matching the current information with the optimized voltage information;
calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
The resistance information is calculated according to the voltage information and the current information of the PV panel, and the insulation grade corresponding to the resistance is judged according to the resistance information, so that the PV panel can be applied to different scenes by different insulation grades, and the insulation effect of the PV panel is improved.
According to the embodiment of the invention, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, which comprises the following steps:
acquiring PV panel voltage information of different time nodes, and extracting voltage characteristics;
comparing the voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, eliminating the corresponding voltage characteristic, and re-fitting the remaining voltage characteristic to obtain the voltage information of the PV panel;
if the characteristic deviation rate is smaller than the first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
The voltage characteristics of the PV panel are analyzed and compared, the voltage characteristics with larger deviation are removed, the voltage precision of the PV panel is improved, and the removed voltage characteristics are fitted, so that the voltage characteristics can better reflect the voltage change of the PV panel.
According to the embodiment of the invention, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, specifically:
acquiring voltage information of a PV panel, and extracting voltage characteristics;
comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
removing noise characteristics, fitting the remaining voltage characteristics, and generating a time curve of voltage information;
analyzing the slope of the curve according to the time curve;
judging whether the slope of the curve is larger than or equal to a preset slope threshold value or not;
if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
The voltage curve is analyzed, the slope is calculated, the voltage information is optimized according to the voltage curve, and the calculation accuracy of the insulation resistance is improved.
According to the embodiment of the invention, after the current information of the PV panel is obtained and the current information is matched with the optimized voltage information, the method further comprises the following steps:
acquiring current information of the PV panel, and performing node matching on the current information and the voltage information at the same time to obtain a matching result;
judging whether the matching result meets the requirement;
if the requirements are met, dividing the same time node voltage information by the current information to obtain impedance information, and generating an insulation resistor according to the impedance information;
and if the voltage information or the current information does not meet the requirements, adjusting the voltage optimization parameters or the current optimization parameters to optimally compensate the voltage information or the current information.
It should be noted that the voltage information and the current information of the same time node are matched, so that the insulation resistance information of the corresponding time node can be accurately calculated, and the PV panel is flexibly applied.
According to the embodiment of the invention, the insulation grades of the PV panel are generated according to the resistance deviation rate, and the application scene of the PV panel is generated according to different insulation grades, so that the related information is obtained, and the method specifically comprises the following steps:
acquiring the insulation grade of the PV panel, and comparing the insulation grade with a preset grade;
if the insulation grade is greater than a preset grade, generating a first application scene, and according to first scene information of a first application field Jing Shengcheng;
if the insulation level is smaller than or equal to the preset value, generating a second application scene, and generating second scene information according to the second application scene;
and performing similarity calculation on the first scene information and the second scene information, and switching the first application scene and the second application scene according to a calculation result.
It should be noted that, matching different application scenes according to different insulation grades, analyzing the similarity of different application scenes, and flexibly switching different scenes, so that the current use condition of the PV panel can be analyzed in real time when the insulation resistance changes.
According to the embodiment of the invention, the insulation grades of the PV panel are generated according to the resistance deviation rate, and the application scene of the PV panel is generated according to different insulation grades, so that the related information is obtained, and the method specifically comprises the following steps:
acquiring the insulation grade of the PV panel, and matching different application scenes according to the insulation grade of the PV panel;
acquiring characteristics of different application scenes and calculating associated characteristics;
analyzing the association degree of the application scene according to the association characteristics;
if the association degree of the application scene is larger than a preset association degree threshold, fusing the application scene and repartitioning the insulation grade of the PV panel;
if the association degree of the application scene is smaller than a preset association degree threshold, the insulation grade of the PV panel is matched with the application scene, and the matching result is transmitted to the terminal.
It should be noted that, by analyzing the association degree of different application scenes and fusing the application scenes according to the association degree, the insulation grade division precision is improved.
According to an embodiment of the present invention, further comprising:
acquiring temperature information and humidity information of a PV panel, and establishing a first relation curve of the temperature information and insulation resistance according to the temperature information;
establishing a second relation curve of the humidity information and the insulation resistance according to the humidity information;
calculating first interference information of the PV panel according to the first relation curve, and calculating second interference information of the PV panel according to the second relation curve;
comparing the first interference information with the second interference information to generate interference degree;
generating a first interference coefficient and a second interference coefficient according to the interference degree;
multiplying the first interference coefficient by insulation resistance information under the first interference information to obtain first optimized resistance information;
multiplying the second interference coefficient by insulation resistance information under the second interference information to obtain second optimized resistance information;
and fusing the first optimized resistance information and the second optimized resistance information to obtain final insulation resistance information.
It should be noted that, the temperature and humidity of the PV panel can all influence the insulation resistance to different degrees, and the interference of temperature and humidity to the insulation resistance is judged through the influence of analysis temperature and humidity, so that the insulation resistance information under the accurate analysis temperature or humidity interference is improved, and the detection precision of the insulation resistance is improved.
A third aspect of the present invention provides a computer readable storage medium having embodied therein a PV panel insulation resistance detection method program which, when executed by a processor, implements the steps of a PV panel insulation resistance detection method as in any of the above.
According to the method, the system and the medium for detecting the insulation resistance of the PV panel, the voltage information of the PV panel is obtained, and the voltage information is preprocessed to obtain the optimized voltage information; acquiring current information of the PV panel, and matching the current information with the optimized voltage information; calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information; comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate; generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information; transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode; and calculating insulation resistance according to the voltage information and the current information of the PV panel, and calculating the insulation grade of the PV panel according to the insulation resistance, so that the PV panels with different insulation grades are applied to different scenes, and the use flexibility of the PV panel is improved.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of units is only one logical function division, and there may be other divisions in actual implementation, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the above-described integrated units of the present invention may be stored in a readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.
Claims (10)
1. A method for detecting insulation resistance of a PV panel, comprising:
acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
acquiring current information of the PV panel, and matching the current information with the optimized voltage information;
calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
2. The method for detecting insulation resistance of a PV panel according to claim 1, wherein the step of obtaining the PV panel voltage information, and preprocessing the voltage information to obtain the optimized voltage information, specifically comprises:
acquiring PV panel voltage information of different time nodes, and extracting voltage characteristics;
comparing the voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, eliminating the corresponding voltage characteristic, and re-fitting the remaining voltage characteristic to obtain the voltage information of the PV panel;
if the characteristic deviation rate is smaller than the first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
3. The method for detecting insulation resistance of a PV panel according to claim 2, wherein the method comprises the steps of obtaining voltage information of the PV panel, preprocessing the voltage information to obtain optimized voltage information, and specifically:
acquiring voltage information of a PV panel, and extracting voltage characteristics;
comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
removing noise characteristics, fitting the remaining voltage characteristics, and generating a time curve of voltage information;
analyzing the slope of the curve according to the time curve;
judging whether the slope of the curve is larger than or equal to a preset slope threshold value or not;
if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
4. The method for detecting insulation resistance of a PV panel according to claim 3, wherein after obtaining current information of the PV panel and matching the current information with the optimized voltage information, further comprising:
acquiring current information of the PV panel, and performing node matching on the current information and the voltage information at the same time to obtain a matching result;
judging whether the matching result meets the requirement;
if the requirements are met, dividing the same time node voltage information by the current information to obtain impedance information, and generating an insulation resistor according to the impedance information;
and if the voltage information or the current information does not meet the requirements, adjusting the voltage optimization parameters or the current optimization parameters to optimally compensate the voltage information or the current information.
5. The method for detecting insulation resistance of a PV panel according to claim 4, wherein the method for detecting insulation resistance of a PV panel according to the resistance deviation rate comprises the steps of:
acquiring the insulation grade of the PV panel, and comparing the insulation grade with a preset grade;
if the insulation grade is greater than a preset grade, generating a first application scene, and according to first scene information of a first application field Jing Shengcheng;
if the insulation level is smaller than or equal to the preset value, generating a second application scene, and generating second scene information according to the second application scene;
and performing similarity calculation on the first scene information and the second scene information, and switching the first application scene and the second application scene according to a calculation result.
6. The method for detecting insulation resistance of a PV panel according to claim 5, wherein the method for detecting insulation resistance of a PV panel according to the resistance deviation rate comprises the steps of:
acquiring the insulation grade of the PV panel, and matching different application scenes according to the insulation grade of the PV panel;
acquiring characteristics of different application scenes and calculating associated characteristics;
analyzing the association degree of the application scene according to the association characteristics;
if the association degree of the application scene is larger than a preset association degree threshold, fusing the application scene and repartitioning the insulation grade of the PV panel;
if the association degree of the application scene is smaller than a preset association degree threshold, the insulation grade of the PV panel is matched with the application scene, and the matching result is transmitted to the terminal.
7. A PV panel insulation resistance detection system, the system comprising: the memory comprises a program of a PV panel insulation resistance detection method, and the program of the PV panel insulation resistance detection method realizes the following steps when being executed by the processor:
acquiring voltage information of a PV panel, and preprocessing the voltage information to obtain optimized voltage information;
acquiring current information of the PV panel, and matching the current information with the optimized voltage information;
calculating the voltage information and the current information of the PV panel successfully matched to obtain insulation resistance information;
comparing the insulation resistance information with preset resistance information to obtain a resistance deviation rate;
generating insulation grades of the PV panel according to the resistance deviation rate, and generating application scenes of the PV panel according to different insulation grades to obtain associated information;
and transmitting the related information of the insulation level of the PV panel matched with the application scene to the terminal in a preset mode.
8. The PV panel insulation resistance detection system according to claim 7, wherein the PV panel voltage information is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, and specifically comprising:
acquiring PV panel voltage information of different time nodes, and extracting voltage characteristics;
comparing the voltage characteristics of the PV panels of adjacent time nodes to obtain a characteristic deviation rate;
if the characteristic deviation rate is larger than the first characteristic deviation rate threshold and smaller than the second characteristic deviation rate threshold, generating first adjustment information, and carrying out average processing on the voltage characteristics of the adjacent time nodes according to the first adjustment information;
if the characteristic deviation rate is larger than the second characteristic deviation rate threshold value, eliminating the corresponding voltage characteristic, and re-fitting the remaining voltage characteristic to obtain the voltage information of the PV panel;
if the characteristic deviation rate is smaller than the first characteristic deviation rate threshold value, smoothing the voltage information to obtain optimized voltage information;
wherein the first characteristic deviation rate is smaller than the second characteristic deviation rate.
9. The PV panel insulation resistance detection system according to claim 8, wherein the PV panel voltage information is obtained, and the voltage information is preprocessed to obtain the optimized voltage information, specifically:
acquiring voltage information of a PV panel, and extracting voltage characteristics;
comparing the voltage characteristics with preset characteristics to obtain analysis results, and screening noise characteristics according to the analysis results;
removing noise characteristics, fitting the remaining voltage characteristics, and generating a time curve of voltage information;
analyzing the slope of the curve according to the time curve;
judging whether the slope of the curve is larger than or equal to a preset slope threshold value or not;
if the voltage curve is greater than or equal to the preset value, generating correction information, and adjusting the slope of the voltage curve according to the correction information;
and if the voltage information is smaller than the threshold value, generating optimized voltage information according to the voltage characteristic fitting after noise elimination.
10. A computer readable storage medium, characterized in that a PV panel insulation resistance detection method program is included in the computer readable storage medium, which PV panel insulation resistance detection method program, when executed by a processor, implements the steps of the PV panel insulation resistance detection method according to any one of claims 1 to 6.
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