CN115825633A - Assessment method and device of photovoltaic inverter complete machine test system and upper computer - Google Patents
Assessment method and device of photovoltaic inverter complete machine test system and upper computer Download PDFInfo
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Abstract
The invention relates to an evaluation method and a device of a complete machine test system of a photovoltaic inverter, wherein the evaluation method of the complete machine test system of the photovoltaic inverter comprises the following steps: acquiring a plurality of test data; calculating the test equipment variation of the complete machine test system of the photovoltaic inverter according to the test data; calculating the variation of testing personnel of the whole photovoltaic inverter testing system according to the test data and the variation of the testing equipment; calculating the photovoltaic inverter variation of the whole photovoltaic inverter test system according to the test data; calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter; and obtaining an evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation. The evaluation method of the complete photovoltaic inverter test system provided by the embodiment of the invention can evaluate the stability of the complete photovoltaic inverter test system.
Description
Technical Field
The invention relates to the technical field of new energy photovoltaic, in particular to an evaluation method and device for a complete machine test system of a photovoltaic inverter and an upper computer.
Background
At present, with the rapid development of the global human society and the rapid consumption of non-renewable energy sources, an energy crisis will occur in the near future. Under the circumstances, the renewable new energy industry, especially the photovoltaic inverter industry, is vigorously developed in various regions of various countries. When the market is in use, the demand of the photovoltaic inverter using new energy resources is increasing, and meanwhile, the requirements on the long-term operation reliability and quality of the photovoltaic inverter are stricter. How to build a reliable complete photovoltaic inverter test system, how to determine whether the complete photovoltaic inverter test system can stably operate, and how to detect the reliability of actual working parameters of the complete photovoltaic inverter test system are important points of exploration.
At present, a building mode of a complete machine testing system of a photovoltaic inverter in the industry is generally built by combining instruments of multiple models and brands with upper computer software, certain defects exist in operation time sequence and logic of each equipment instrument, mutual interference can be formed among the instruments when the system operates, and further the reliability of relevant parameters of a tested product is reduced.
Disclosure of Invention
The technical problem mainly solved by the embodiment of the invention is to provide an evaluation method and device for a complete machine test system of a photovoltaic inverter and an upper computer, which can evaluate the stability of the complete machine test system of the photovoltaic inverter.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: the evaluation method of the complete photovoltaic inverter test system is provided, and comprises the following steps:
acquiring a plurality of test data;
calculating the test equipment variation of the complete machine test system of the photovoltaic inverter according to the test data;
calculating the variation of testing personnel of the whole photovoltaic inverter testing system according to the test data and the variation of the testing equipment;
calculating the photovoltaic inverter variation of the whole photovoltaic inverter test system according to the test data;
calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter;
and obtaining an evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation.
In some embodiments, calculating the test equipment variation of the photovoltaic inverter complete machine test system according to the test data comprises:
acquiring a first constant and a test equipment variation formula;
calculating a first range mean value of a complete machine test system of the photovoltaic inverter according to the test data;
and calculating the variation of the test equipment according to the first range mean value, the first constant and the variation formula of the test equipment.
In some embodiments, the test data includes the number of parts and the number of measurements, and calculating the variation of the tester of the complete photovoltaic inverter test system according to the test data and the variation of the test equipment includes:
acquiring a second constant and a variation formula of a tester;
calculating a second pole difference average value of the whole photovoltaic inverter test system according to the test data;
and calculating the variation of the testers according to the variation of the test equipment, the number of parts, the measurement times, the second pole difference average value, the second constant and the variation formula of the testers.
In some embodiments, the tester variability formula is:
In some embodiments, calculating the pv inverter degradation of the pv inverter overall test system from the test data comprises:
acquiring a third constant and a photovoltaic inverter variation formula;
calculating a third pole difference mean value of the complete machine test system of the photovoltaic inverter according to the test data;
and calculating the variation of the photovoltaic inverter according to the third pole difference average value, the third constant and the variation formula of the photovoltaic inverter.
In some embodiments, calculating the total variation of the complete photovoltaic inverter test system according to the test equipment variation, the tester variation and the photovoltaic inverter variation comprises:
acquiring a total variation formula;
and calculating the total variation according to the test equipment variation, the tester variation, the photovoltaic inverter variation and the total variation formula.
In some embodiments, the evaluation result includes a fluctuation result of the test equipment, a fluctuation result of the test personnel, and a fluctuation result of the photovoltaic inverter;
obtaining the evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation comprises the following steps:
acquiring a fluctuation ratio threshold value of the test equipment, a fluctuation ratio threshold value of a test person and a fluctuation ratio threshold value of the photovoltaic inverter;
calculating a fluctuation ratio of the test equipment, a fluctuation ratio of the test personnel and a fluctuation ratio of the photovoltaic inverter according to the variation of the test equipment, the variation of the test personnel, the variation of the photovoltaic inverter and the total variation;
comparing the fluctuation proportion of the test equipment with the fluctuation proportion threshold of the test equipment to obtain a fluctuation result of the test equipment;
comparing the fluctuation proportion of the testers with the fluctuation proportion threshold of the testers to obtain the fluctuation result of the testers;
and comparing the photovoltaic inverter fluctuation ratio with the photovoltaic inverter fluctuation ratio threshold value to obtain the fluctuation result of the photovoltaic inverter.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: the utility model provides an evaluation device of photovoltaic inverter complete machine test system, the device includes:
the first acquisition module is used for acquiring a plurality of test data;
the first calculation module is used for calculating the test equipment variation of the whole photovoltaic inverter test system according to the test data;
the second calculation module is used for calculating the variation of testing personnel of the whole photovoltaic inverter testing system according to the testing data and the variation of the testing equipment;
the third calculation module is used for calculating the photovoltaic inverter variation of the complete photovoltaic inverter test system according to the test data;
the fourth calculation module is used for calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter;
and the second acquisition module is used for acquiring an evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation.
In some embodiments, the first calculation module comprises:
the first constant unit is used for acquiring a first constant and a test equipment variation formula;
the first calculation unit is used for calculating a first range mean value of the complete machine test system of the photovoltaic inverter according to the test data;
and the second calculating unit is used for calculating the variation of the test equipment according to the first range mean value, the first constant and the test equipment variation formula.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: provided is a host computer including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above evaluation method of the photovoltaic inverter complete machine test system.
Different from the situation of the related art, the evaluation method, the evaluation device and the upper computer of the complete photovoltaic inverter test system provided by the embodiment of the invention obtain the test equipment variation, the tester variation, the photovoltaic inverter variation and the total variation of the complete photovoltaic inverter test system by obtaining a plurality of test data and calculating the test data, so that the stability of the complete photovoltaic inverter test system is evaluated. The evaluation method and device for the complete machine test system of the photovoltaic inverter and the upper computer provided by the embodiment of the invention establish a reliable mathematical model, and test equipment variation, tester variation, photovoltaic inverter variation and total variation of the complete machine test system of the photovoltaic inverter are calculated through experiments, so that the fluctuation of the complete machine test system of the photovoltaic inverter can be directly and definitely quantified, and powerful data support is provided for research personnel to inquire fluctuation abnormity of the complete machine test system of the photovoltaic inverter; powerful guarantee and scientific basis are provided for research and development personnel to directionally and regularly optimize and improve the complete machine test system and improve the product shipment detection qualification rate.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
FIG. 1 is a schematic structural diagram of a part of test equipment and a photovoltaic inverter in a photovoltaic inverter complete machine test system;
FIG. 2 is a schematic structural diagram of another part of testing equipment and a photovoltaic inverter in the photovoltaic inverter complete machine testing system;
fig. 3 is a schematic flowchart of an evaluation method of a complete photovoltaic inverter test system according to an embodiment of the present invention;
FIG. 4 is a schematic flowchart of a method for calculating the degradation of a test device of a complete photovoltaic inverter test system according to test data, provided by an embodiment of the present invention;
FIG. 5 is a schematic flow chart for calculating variation of a tester of a complete machine testing system of a photovoltaic inverter according to test data and variation of testing equipment, provided by an embodiment of the invention;
FIG. 6 is a schematic flowchart of a process for calculating a PV inverter variation of a PV inverter complete machine testing system according to test data provided by an embodiment of the present invention;
FIG. 7 is a schematic flow chart for calculating the total variation of the complete PV inverter testing system according to the variation of the testing equipment, the variation of the tester, and the variation of the PV inverter according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of obtaining an evaluation result of a complete pv inverter test system according to variation of test equipment, variation of test personnel, variation of a pv inverter, and total variation according to an embodiment of the present invention;
FIG. 9 is a schematic view of a process for detecting a photovoltaic inverter in a photovoltaic inverter complete machine test system;
FIG. 10 is a statistical table of test data for testing the input voltage of a photovoltaic inverter in accordance with an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an evaluation apparatus of a complete photovoltaic inverter test system according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a first computing module according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of an upper computer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. Additionally, while functional block divisions are performed in the device diagrams, with logical sequences shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than the block divisions in the device diagrams, or the flowcharts.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of a part of test equipment and a photovoltaic inverter in a complete photovoltaic inverter test system, and fig. 2 is a schematic structural diagram of another part of test equipment and a photovoltaic inverter in the complete photovoltaic inverter test system.
In fig. 1 and 2, a photovoltaic inverter complete machine test system 1000 includes a photovoltaic inverter 200 and a test apparatus 300, and the test apparatus 300 includes: photovoltaic array simulator 301, start-up power 302, level shift circuit 303, level shift circuit 304, PC305, PC306, VAC step down 307, VAC step up 308, contactor 309, vacuum switch 310, grid 311, photovoltaic input sensor 312, photovoltaic output sensor 313, and digital power meter 314.
The pv inverter complete machine test system 1000 includes the above-mentioned pv inverter 200 and test equipment 300, and further includes a tester 400 (not shown). Tester 400 is used to test photovoltaic inverter 200 according to the test guidelines. The test guide comprises operation steps of starting a test, replacing the photovoltaic inverter, ending the test and the like.
The photovoltaic array simulator 301 is a three-phase voltage high-frequency PWM rectifier, converts alternating current input by the grid 311 after being subjected to voltage reduction by the VAC voltage reduction 301 into direct current required by the photovoltaic inverter 200, and the photovoltaic array simulator 301 is configured to simulate a PV input of the photovoltaic inverter 200 on the solar power generation side.
The VAC step-down 307 may achieve electrical isolation for reducing the input voltage of the photovoltaic array simulator 301 and increasing the dc-controlled voltage range.
Photovoltaic input sensor 312 is used to collect ac current and voltage at the input of photovoltaic inverter 200 in real time.
The photovoltaic output sensor 313 is used for collecting the output direct current and voltage of the photovoltaic inverter 200 in real time.
The digital power meter 314 is configured to calculate a photovoltaic conversion efficiency of the photovoltaic inverter 200, and the digital power meter 314 may obtain an input ac current and a voltage of the photovoltaic inverter 200, and an output dc current and a voltage of the photovoltaic inverter 200, which are acquired by the photovoltaic input sensor 312 and the photovoltaic output sensor 313 in real time. The photovoltaic conversion efficiency calculated by digital power meter 314 is the ratio of the output power of photovoltaic inverter 200 and the input power of photovoltaic inverter 200.
Further, the ac current and voltage at the input end of the photovoltaic inverter 200 and the dc current and voltage at the output end of the photovoltaic inverter 200 collected by the digital power meter 31 are fed back to the photovoltaic upper computer test software in the PC305 or the PC 306. Finally, the pv upper computer test software calculates the ratio of the output power of pv inverter 200 to the input power of pv inverter 200 to obtain the pv conversion efficiency, and the test data is stored in the server or PC305 or PC306 for the user to query. The test data includes: the input ac current and voltage of photovoltaic inverter 200, the output dc current and voltage of photovoltaic inverter 200, and the photovoltaic conversion efficiency.
Further, the digital power meter 314 further includes a current and voltage acquisition module (not shown), the analog voltage signal is converted into a digital signal by an operational amplifier analog-to-digital conversion circuit (not shown), and the digital power meter 314 reads the digital signal and displays the digital signal in real time through a display screen (not shown).
Further, one end of contactor 309 is connected to VAC boost 308 at the output of photovoltaic inverter 200, and the other end of contactor 309 is connected to grid 311. The contactor 309 is used for cutting off the grid connection of the alternating current output and the power grid 309, has the functions of under-voltage protection, zero-voltage protection and the like, is suitable for frequent operation and remote control, and enables the photovoltaic inverter 200 to work more reliably and have a longer service life.
The level conversion circuit 303 and the level conversion circuit 304 respectively acquire and convert the electrical signal of the photovoltaic array simulator 301 and the electrical signal output by the photovoltaic inverter 200 into a low level signal through the RS485, and output the low level signal to the PC305 and the PC306 for real-time display and monitoring of test data.
The PC305 and the PC306 may be one upper computer or a plurality of upper computers which communicate with each other. The upper computers are all provided with photovoltaic upper computer test software which is used for displaying test steps and test data of the photovoltaic inverter test system in real time and recording test progress and test results.
It should be noted that the photovoltaic inverter test system 1000 in the embodiment of the present invention tests the photovoltaic conversion efficiency of the photovoltaic inverter 200. In some embodiments, the pv inverter overall test system 1000 tests the following four sets of data. The first group of data is photovoltaic PV test data, and comprises startup writing parameters, serial number writing, PV voltage calculation, AC current calculation, grid-connected efficiency, insulation impedance, grid-connected harmonic waves and the like. The second group of data is discharge test data, including communication detection, calculation of discharge voltage and current, calculation of discharge power, discharge harmonic and the like. The third group of data is charging test data, including calculating charging efficiency, charging harmonic, charging direct current component, etc. The fourth group of data is EPS test data, and comprises output voltage calibration condition calculation, load current calibration condition calculation, EPS mode efficiency calculation and the like.
Referring to fig. 9, fig. 9 is a schematic diagram illustrating a process of detecting a photovoltaic inverter in a photovoltaic inverter complete machine test system.
The photovoltaic inverter detecting step comprises the following steps:
step S101 starts.
The step S101 is that the tester 400 controls the photovoltaic inverter complete machine test system 1000 to start testing the photovoltaic inverter 200 according to the test guidance.
And S102, connecting the photovoltaic inverter with test equipment.
The tester 400 connects the photovoltaic inverter 200 with the test equipment 300 according to the test guide, and starts the upper computer test software to select a test program.
And step S103, reading the external bar code of the machine.
Tester 400 scans the external barcode of photovoltaic inverter 200, which is the fuselage serial number. Then, the test apparatus 300 reads the machine external barcode of the photovoltaic inverter 200.
And S104, checking the machine burning bar code and the scanning bar code.
The test equipment 300 compares the burning machine barcode of the test equipment 300 with the machine external barcode of the photovoltaic inverter 200 to obtain a comparison result.
Step S105, determine whether to check OK? If yes, go to step S106. If not, go to step S117.
The testing device 300 confirms whether the identity of the pv inverter is correct and whether the pv inverter is ready through the comparison result.
And S106, calling a product testing program by the upper computer to start testing.
The PC305 and/or the PC306 in the test device 300 are both an upper computer, and the upper computer calls a pre-stored product test program and starts the test program. The product test program is the photovoltaic upper computer test software.
And S107, reading the hardware version, and calculating the PV self-loss power.
PC305 and/or PC306 in test apparatus 300 reads the hardware version of pv inverter 200, and calculates the PC self-loss power of pv inverter 200 according to the hardware version.
And step S108, reading the temperature of the machine and the real-time temperature of the environment.
PC305 and/or PC306 in test apparatus 300 read the machine temperature and ambient real-time temperature of the photovoltaic inverter.
Step S109, determine whether the temperature difference exceeds the standard? If yes, go to step S117. If not, go to step S110.
The above steps allow the test temperature of photovoltaic inverter 200 to be controlled.
Step S110, PV voltage is calculated, and AC voltage calibration effect is achieved.
The PC305 and/or the PC306 in the test equipment 300 perform waveform calibration on the input voltage and the output voltage of the photovoltaic inverter, and obtain a waveform calibration result.
Step S111, determine whether to calibrate OK? If yes, go to step S112. If not, go to step S117.
The PC305 and/or the PC306 in the testing apparatus 300 compare the waveform calibration results according to the pre-stored calibration effect, so that the testing data obtained by the testing apparatus 300 is more accurate and reliable.
And S112, carrying out high-low direct current voltage grid connection test.
The PC305 and/or the PC306 control the VAC boost 308 to boost the dc power output by the photovoltaic inverter 200 differently, and the test is performed with different dc powers being incorporated into the grid 311.
And step S113, detecting the direct current input performance.
PC305 and/or PC306 acquire test data of the dc input terminal of photovoltaic inverter 200 to detect the dc input performance of photovoltaic inverter 200.
And step S114, alternating current output performance detection.
PC305 and/or PC306 acquire test data of the ac output terminal of photovoltaic inverter 200 to detect the ac output performance of photovoltaic inverter 200.
And step S115, detecting the power generation amount.
PC305 and/or PC306 acquire the amount of power at the input of photovoltaic inverter 200 to detect the amount of photovoltaic power generation at the input of photovoltaic inverter 200.
And step S116, storing the test log and the result.
The memory in PC305 and/or PC306 is used to store test logs including test data, test progress, and the like, and test results.
And step S117, end.
The PC305 and/or the PC306 controls the test program to end, or the tester 400 controls the test program to end.
It should be noted that the step of detecting the photovoltaic inverter is completed by the cooperation of the photovoltaic inverter 200, the test equipment 300 and the tester 400 in the photovoltaic inverter complete machine test system 1000.
At present, the photovoltaic inverter complete machine test system 1000 in the industry is generally built by combining multi-model and multi-brand instruments with test software of an upper computer, certain defects exist in operation time sequence and logic of each equipment instrument, mutual interference can be formed between the instruments when the photovoltaic inverter complete machine test system 1000 operates, and further the reliability of relevant parameters of a tested product is reduced. Therefore, the embodiment of the present invention provides an evaluation method for the complete photovoltaic inverter test system 1000, which can detect the stability of the complete photovoltaic inverter test system 1000, so as to correct the complete photovoltaic inverter test system 1000, and make the complete photovoltaic inverter test system 1000 more objectively reflect the operation performance of the photovoltaic inverter 2000.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating an evaluation method of a complete photovoltaic inverter test system according to an embodiment of the present invention.
The evaluation method of the complete machine test system of the photovoltaic inverter comprises the following steps:
s1, obtaining a plurality of test data.
The test data is test data of a complete photovoltaic inverter test system, such as the dc input voltage, the dc input current, the ac output voltage, the ac output current, and the like of the photovoltaic inverter.
In the embodiment of the invention, the complete photovoltaic inverter testing system comprises a plurality of photovoltaic inverters, a plurality of testing devices and a plurality of testing personnel.
In a complete machine test system of a photovoltaic inverter, generally considered under ideal conditions, factors causing system deterioration of the complete machine test system of the photovoltaic inverter mainly come from testers, test equipment and the photovoltaic inverter, the testers, the test equipment and the photovoltaic inverter are not interfered with each other and are independent of each other, and other influence factors can be ignored, so that a mathematical model establishment formula is as follows:
wherein FV is the total variation of the whole photovoltaic inverter test system, and C is a constant term. The EV is a deterioration of the test equipment caused by the test equipment, and generally, the EV is a test equipment in which the same tester uses the same pv inverter to test in different test equipment, and at this time, the EV considers that the only factor causing the fluctuation of the whole pv inverter test system as the test equipment. Similarly, the AV is the deterioration of the tester caused by the operation of the tester, and generally, different testers use the same photovoltaic inverter to test in the same test equipment, and at this time, the only factor causing the fluctuation of the whole photovoltaic inverter test system is considered as the tester. Similarly, PV is the photovoltaic inverter deterioration caused by the photovoltaic inverter test fluctuation, and generally, the PV is tested in the same test equipment by the same tester using different photovoltaic inverters, and at this time, the only factor causing the photovoltaic inverter complete machine test system fluctuation deterioration is considered as the photovoltaic inverter.
Specifically, in order to obtain test data of the complete photovoltaic inverter test system to calculate variation AV of a tester and variation PV of the photovoltaic inverter, before evaluation, the complete photovoltaic inverter test system needs to be operated as follows:
firstly, randomly selecting 10 or more photovoltaic inverters 200 with good functions for random numbering, wherein 10 complete machines are taken as an example in the embodiment of the invention, and the random numbering is 1 to 10.
Then, 3 or more skilled production line testers are randomly selected and numbered, in the embodiment of the invention, 10 complete machines are taken as an example, and numbers A, B and C are randomly numbered. The tester guides the test equipment and the photovoltaic inverter to be connected according to the test, and the tester starts the test. Each person respectively carries out random disordered blind test on 10 photovoltaic inverters for 3 rounds and more, and 3 rounds are taken as an example in the embodiment of the invention. Thereby acquiring a total of 90 sets of test data.
And finally, calling test data from a PC upper computer of the photovoltaic inverter complete machine test system, and importing the test data into a data statistical analysis table, wherein the photovoltaic input voltage is exemplified.
As shown in fig. 10, fig. 10 is a test data statistical table for testing the input voltage of the photovoltaic inverter according to the embodiment of the present invention. The first row in fig. 10 includes 10 photovoltaic inverters 1 to 10. The first column in fig. 10 includes three testers a, B, C, each testing 10 pv inverters three times.
It should be noted that the test data also includes a plurality of test data obtained by testing the same tester in different test devices by using the same photovoltaic inverter. For example, a plurality of photovoltaic array simulators 301 of FIG. 1 may be included. When each photovoltaic array simulator 301 is tested, different photovoltaic array simulators 301, the same testing equipment and the same tester, test the same photovoltaic inverter.
And S2, calculating the test equipment variation of the complete machine test system of the photovoltaic inverter according to the test data.
Specifically, the variation EV of the test equipment is calculated according to test data obtained by testing the same photovoltaic inverter in different test equipment by the same tester.
Further, referring to fig. 4, fig. 4 is a schematic flowchart of calculating a variation of a test device of a complete pv inverter test system according to test data according to an embodiment of the present invention.
In some embodiments, calculating the test equipment variation of the photovoltaic inverter complete machine test system according to the test data comprises:
and S21, acquiring a first constant and a test equipment variation formula.
The test equipment variation EV is determined by multiplying the first worst mean value by a first constant (K1). The first constant K1 is a number multiplied by the number of evaluators depending on the number of measurements and the number of parts. Typically, the first constant K1 is a fixed constant.
The test equipment variation formula is as follows:
wherein EV means that the test equipment is deteriorated,
is the first range average, and K1 is the first constant.
And S22, calculating a first range mean value of the complete machine test system of the photovoltaic inverter according to the test data.
The first range mean comprises the sum of the range means for each test subject divided by the number of test subjects.
Taking fig. 10 as an example, the calculation formula of the first range mean is:
Taking the example of fig. 10 as an example,
the content of the compound was 0.054000,
is a non-volatile organic compound (I) of 0.037778,
is a content of 0.045000 in terms of,
is 0.045592.
And S23, calculating the variation of the testing equipment according to the first range mean value, the first constant and the variation formula of the testing equipment.
And substituting the first range mean value and the first constant of each test device into the test device variation formula to obtain the test device variation of each test device.
And S3, calculating the variation of the tester of the complete machine testing system of the photovoltaic inverter according to the test data and the variation of the testing equipment.
Specifically, variation AV of the tester is calculated according to test data obtained by testing different testers in the same test equipment by using the same photovoltaic inverter.
Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a process of calculating variation of a tester of a complete photovoltaic inverter test system according to test data and variation of test equipment according to an embodiment of the present invention.
In some embodiments, the test data includes the number of parts and the number of measurements, and calculating the variation of the tester of the complete photovoltaic inverter test system according to the test data and the variation of the test equipment includes:
and S31, acquiring a second constant and a tester variation formula.
Wherein the variation AV of the tester is calculated from the second pole difference mean value
And a second constant K2. K2 depends on the number of raters in the gauge study. Typically, the second constant K2 is a fixed constant.
In some embodiments, the tester variability formula is:
Taking the example of fig. 10 as an example,
is a number of 10 and is provided with,
is 3.
And S32, calculating a second pole difference average value of the complete machine test system of the photovoltaic inverter according to the test data.
The second mean range is the mean range of the test data in all rounds for all testers.
The calculation formula of the second pole difference mean value is as follows:
wherein the content of the first and second substances,
is the average value of the second pole difference,
the maximum mean of the test data in all rounds for all testers,
the minimum mean of the data was tested in all rounds for all testers.
Taking the example of fig. 10 as an example,
is 0.013750.
And S33, calculating the variation of the testers according to the variation of the test equipment, the number of parts, the measurement times, the average value of the second range, the second constant and the variation formula of the testers.
Specifically, the variation of the tester is obtained by substituting the variation of the test equipment, the number of parts, the number of times of measurement, the average value of the second range and the second constant into a variation formula of the tester.
And S4, calculating the photovoltaic inverter variation of the whole photovoltaic inverter test system according to the test data.
Specifically, a third constant and a photovoltaic inverter variation formula are obtained first, then the test data are used for calculating a third pole difference mean value according to the third constant and the third constant are substituted into the photovoltaic inverter variation formula to obtain the photovoltaic inverter variation.
The photovoltaic inverter variation formula is as follows:
and PV is the variation of the photovoltaic inverter, rp is the mean value of the third pole difference, and K3 is a third constant.
The photovoltaic inverter variation PV is determined by the pole difference RP of the part mean value and the third constant K3. K3 depends on the number of parts used in the gauge study. Typically, the third constant K3 is a fixed constant.
And Rp is the mean value of the third pole difference, namely the mean value of the part is extremely poor. As shown in fig. 10, rp is 0.232222.
And S5, calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter.
Specifically, the total variation of the complete photovoltaic inverter test system is determined by the variation of test equipment, the variation of testers and the variation of the photovoltaic inverter.
Referring to fig. 7, fig. 7 is a schematic flowchart of calculating a total variation of a complete pv inverter test system according to a variation of test equipment, a variation of testers, and a variation of a pv inverter according to an embodiment of the present invention.
In some embodiments, calculating the total variation of the complete photovoltaic inverter test system according to the test equipment variation, the tester variation and the photovoltaic inverter variation comprises:
and S51, acquiring a total variation formula.
The total variation formula is as follows:
wherein FV is total variation, EV is test equipment variation, PV is photovoltaic inverter variation, and AV is tester variation.
And S52, calculating the total variation according to the test equipment variation, the tester variation, the photovoltaic inverter variation and the total variation formula.
And substituting the variation of the test equipment, the variation of the tester and the variation of the photovoltaic inverter into a total variation formula to obtain the total variation of the complete machine test system of the photovoltaic inverter.
And S6, obtaining an evaluation result of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel, the variation of the photovoltaic inverter and the total variation.
Specifically, the fluctuation result of the test equipment can be obtained according to the ratio of the variation of the test equipment to the total variation. And obtaining the fluctuation result of the tester according to the ratio of the variation of the tester to the total variation. According to the ratio of the variation of the photovoltaic inverter to the total variation, the fluctuation result of the photovoltaic inverter can be obtained. The larger the above ratio is, the larger the fluctuation is.
Referring to fig. 8, fig. 8 is a schematic flow chart illustrating obtaining an evaluation result of a complete pv inverter test system according to test equipment variation, tester variation, pv inverter variation, and total variation according to an embodiment of the present invention.
In some embodiments, the evaluation results include results of fluctuations of the test equipment, results of fluctuations of the test personnel, and results of fluctuations of the photovoltaic inverter. Obtaining the evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation comprises the following steps:
and S61, acquiring a fluctuation ratio threshold of the testing equipment, a fluctuation ratio threshold of the testing personnel and a fluctuation ratio threshold of the photovoltaic inverter.
For example, the fluctuation ratio threshold value of the test equipment can be set to be 10%, the fluctuation ratio threshold value of the tester can be set to be 30%, and the fluctuation ratio threshold value of the photovoltaic inverter can be set to be 30%. The fluctuation proportion threshold of the test equipment, the fluctuation proportion threshold of the test personnel and the fluctuation proportion threshold of the photovoltaic inverter can be set according to actual requirements.
And S62, calculating a fluctuation ratio of the test equipment, a fluctuation ratio of the test personnel and a fluctuation ratio of the photovoltaic inverter according to the variation of the test equipment, the variation of the test personnel, the variation of the photovoltaic inverter and the total variation.
The fluctuation ratio of the test equipment is
The ratio of fluctuation of the tester is
The fluctuation ratio of the photovoltaic inverter is
. Wherein FV is total variation, EV is test equipment variation, PV is photovoltaic inverter variation, and AV is tester variation.
And S63, comparing the fluctuation ratio of the test equipment with the fluctuation ratio threshold of the test equipment to obtain the fluctuation result of the test equipment.
If the fluctuation proportion of the test equipment is larger than or equal to the fluctuation proportion threshold value of the test equipment, the fluctuation result of the test equipment is that the fluctuation of the test equipment is large, and the test equipment needs to be maintained or replaced.
If the fluctuation proportion of the test equipment is smaller than the threshold value of the fluctuation proportion of the test equipment, the fluctuation result of the test equipment is that the fluctuation of the test equipment is small, and the test equipment does not need to be maintained or replaced.
And S64, comparing the fluctuation ratio of the testers with the fluctuation ratio threshold of the testers to obtain the fluctuation result of the testers.
If the fluctuation proportion of the testers is larger than or equal to the fluctuation proportion threshold of the testers, the fluctuation result of the testers is that the fluctuation of the testers is large, and the testers need to be replaced or trained.
If the fluctuation proportion of the testers is smaller than the fluctuation proportion threshold of the testers, the fluctuation result of the testers is that the fluctuation of the testers is small, and the testers do not need to be replaced or trained.
And S65, comparing the photovoltaic inverter fluctuation ratio with a photovoltaic inverter fluctuation ratio threshold value to obtain a photovoltaic inverter fluctuation result.
If the fluctuation ratio of the photovoltaic inverter is greater than or equal to the fluctuation ratio threshold of the photovoltaic inverter, the fluctuation result of the photovoltaic inverter is that the photovoltaic inverter fluctuates greatly, and the photovoltaic inverter needs to be maintained or replaced.
If the fluctuation proportion of the photovoltaic inverter is smaller than the fluctuation proportion threshold value of the photovoltaic inverter, the fluctuation result of the photovoltaic inverter is that the fluctuation of the photovoltaic inverter is small, and the photovoltaic inverter does not need to be maintained or replaced.
The evaluation method of the complete machine test system of the photovoltaic inverter provided by the embodiment of the invention comprises the following steps: acquiring a plurality of test data; calculating the test equipment variation of the complete machine test system of the photovoltaic inverter according to the test data; calculating the variation of testing personnel of the whole photovoltaic inverter testing system according to the test data and the variation of the testing equipment; calculating the photovoltaic inverter variation of the whole photovoltaic inverter test system according to the test data; calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter; and obtaining an evaluation result of the complete machine testing system of the photovoltaic inverter according to the variation of the testing equipment, the variation of the testing personnel, the variation of the photovoltaic inverter and the total variation. The evaluation method of the complete photovoltaic inverter test system provided by the embodiment of the invention can simultaneously meet the test requirements of the photovoltaic inverter with multiple power sections, is convenient for testers to operate, can effectively reduce the investment cost, and improves the equipment investment return rate. And a scientific mathematical statistical method is adopted, a reliable mathematical model is established, and the total variation, the test equipment variation, the photovoltaic inverter variation and the variation of testers of the whole photovoltaic inverter test system are calculated through reliability experiments, so that the system fluctuation variation can be directly and definitely quantified, and powerful data support is provided for research and development personnel to inquire the fluctuation abnormity of the test system. Meanwhile, a method for detecting control variables by hypothesis is introduced, and the change of the test equipment, the change of the photovoltaic inverter and the change of the tester are mutually independent and do not influence each other, so that the fluctuation change condition of the system can be quickly and definitely positioned. The method provides a scientific basis for research personnel to directionally and regularly optimize the complete machine test system of the photovoltaic inverter, and provides a powerful guarantee for improving the product shipment detection qualification rate.
Referring to fig. 11, fig. 11 is a schematic structural diagram of an evaluation apparatus of a complete photovoltaic inverter test system according to an embodiment of the present invention. The evaluation device 100 of the complete photovoltaic inverter test system includes:
a first obtaining module 11, configured to obtain a plurality of test data;
the first calculation module 12 is used for calculating the test equipment variation of the complete photovoltaic inverter test system according to the test data;
the second calculation module 13 is used for calculating variation of testing personnel of the complete machine testing system of the photovoltaic inverter according to the testing data and the variation of the testing equipment;
the third calculating module 14 is used for calculating the photovoltaic inverter variation of the complete photovoltaic inverter testing system according to the testing data;
the fourth calculation module 15 is used for calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter;
and a second obtaining module 16, configured to obtain an evaluation result of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation, and the total variation.
Referring to fig. 12, fig. 12 is a schematic structural diagram of the first computing module 12 according to an embodiment of the present invention.
In some embodiments, the first computing module 12 includes:
a first constant unit 121, configured to obtain a first constant and a test equipment variation formula;
the first calculating unit 122 is configured to calculate a first range mean value of the complete photovoltaic inverter test system according to the test data;
the second calculating unit 123 is configured to calculate the variation of the testing device according to the first range mean, the first constant, and the testing device variation formula.
The evaluation apparatus 100 of the complete photovoltaic inverter test system provided in the embodiment of the present invention includes: a first obtaining module 11, configured to obtain a plurality of test data; the first calculation module 12 is used for calculating the test equipment variation of the complete photovoltaic inverter test system according to the test data; the second calculation module 13 is used for calculating variation of testing personnel of the complete machine testing system of the photovoltaic inverter according to the testing data and the variation of the testing equipment; the third calculation module 14 is used for calculating the photovoltaic inverter variation of the complete photovoltaic inverter test system according to the test data; the fourth calculation module 15 is used for calculating the total variation of the whole photovoltaic inverter test system according to the variation of the test equipment, the variation of the test personnel and the variation of the photovoltaic inverter; and a second obtaining module 16, configured to obtain an evaluation result of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation, and the total variation. The evaluation device 100 for the complete photovoltaic inverter test system provided by the embodiment of the invention can evaluate the stability of the complete photovoltaic inverter test system.
It should be noted that the evaluation apparatus 100 of the complete pv inverter test system can execute the evaluation method of the complete pv inverter test system provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in the embodiment of the evaluation apparatus of the complete pv inverter test system, reference may be made to the evaluation method of the complete pv inverter test system provided in the embodiment of the present invention.
Referring to fig. 13, fig. 13 is a schematic structural diagram of an upper computer according to an embodiment of the present invention. The upper computer 10 may be implemented by a Micro Control Unit (MCU), a Digital Signal Processing (DSP) controller, a microcomputer, a desktop computer, an all-in-one machine, and a notebook computer.
As shown in fig. 13, the upper computer 10 includes at least one processor 11 and a memory 12, wherein the memory 12 may be built in the upper computer 10 or externally installed outside the upper computer 10, and the memory 12 may also be a remotely installed memory and connected to the upper computer 10 through a network.
The memory 12, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The memory 12 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 12 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 12 may optionally include memory located remotely from the processor 11, which may be connected to the terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The processor 11 executes various functions of the terminal and processes data by running or executing software programs and/or modules stored in the memory 12 and calling data stored in the memory 12, so as to perform overall monitoring on the terminal, for example, implement the evaluation method of the photovoltaic inverter overall test system according to any embodiment of the present application.
The number of the processors 11 may be one or more, and one processor 11 is illustrated in fig. 8. The processor 11 and the memory 12 may be connected by a bus or other means. The processor 11 may include a Central Processing Unit (CPU), digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), controller, field Programmable Gate Array (FPGA) device, or the like. The processor 11 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An evaluation method of a complete photovoltaic inverter test system is characterized by comprising the following steps:
acquiring a plurality of test data;
calculating the variation of the test equipment of the complete machine test system of the photovoltaic inverter according to the test data;
calculating variation of testing personnel of the complete machine testing system of the photovoltaic inverter according to the testing data and the variation of the testing equipment;
calculating the photovoltaic inverter variation of the complete photovoltaic inverter test system according to the test data;
calculating the total variation of the whole photovoltaic inverter test system according to the test equipment variation, the test personnel variation and the photovoltaic inverter variation;
and obtaining an evaluation result of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation and the total variation.
2. The method for evaluating the complete photovoltaic inverter test system according to claim 1, wherein the calculating the test equipment variation of the complete photovoltaic inverter test system according to the test data comprises:
acquiring a first constant and a test equipment variation formula;
calculating a first range mean value of the complete machine test system of the photovoltaic inverter according to the test data;
and calculating the variation of the test equipment according to the first range mean value, the first constant and the variation formula of the test equipment.
3. The evaluation method of the complete photovoltaic inverter test system according to claim 1, wherein the test data comprises the number of parts and the number of measurements, and the calculating the variation of the tester of the complete photovoltaic inverter test system according to the test data and the variation of the test equipment comprises:
acquiring a second constant and a variation formula of a tester;
calculating a second pole difference mean value of the complete photovoltaic inverter test system according to the test data;
and calculating the variation of the testers according to the variation of the test equipment, the number of the parts, the measurement times, the second pole difference average value, the second constant and the variation formula of the testers.
4. The evaluation method of the complete photovoltaic inverter test system according to claim 3, wherein the variation formula of the tester is as follows:
5. The method of claim 1, wherein the calculating the PV inverter variation of the PV inverter complete machine test system according to the test data comprises:
acquiring a third constant and a photovoltaic inverter variation formula;
calculating a third pole difference mean value of the complete photovoltaic inverter test system according to the test data;
and calculating the photovoltaic inverter variation according to the third pole difference average value, the third constant and the photovoltaic inverter variation formula.
6. The method for evaluating the complete photovoltaic inverter test system according to claim 1, wherein the calculating the total variation of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation and the photovoltaic inverter variation comprises:
acquiring a total variation formula;
and calculating the total variation according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation and the total variation formula.
7. The evaluation method of the complete photovoltaic inverter test system according to claim 1, wherein the evaluation result comprises a fluctuation result of test equipment, a fluctuation result of test personnel and a fluctuation result of a photovoltaic inverter;
the obtaining of the evaluation result of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation and the total variation comprises the following steps:
acquiring a fluctuation proportion threshold value of test equipment, a fluctuation proportion threshold value of a tester and a fluctuation proportion threshold value of a photovoltaic inverter;
calculating a fluctuation ratio of the test equipment, a fluctuation ratio of the test personnel and a fluctuation ratio of the photovoltaic inverter according to the variation of the test equipment, the variation of the test personnel, the variation of the photovoltaic inverter and the total variation;
comparing the fluctuation proportion of the test equipment with the fluctuation proportion threshold of the test equipment to obtain a fluctuation result of the test equipment;
comparing the fluctuation proportion of the testers with the fluctuation proportion threshold of the testers to obtain the fluctuation result of the testers;
and comparing the photovoltaic inverter fluctuation ratio with the photovoltaic inverter fluctuation ratio threshold value to obtain the fluctuation result of the photovoltaic inverter.
8. An evaluation device of a complete photovoltaic inverter test system is characterized by comprising:
the first acquisition module is used for acquiring a plurality of test data;
the first calculation module is used for calculating the variation of test equipment of the complete photovoltaic inverter test system according to the test data;
the second calculation module is used for calculating variation of testing personnel of the whole photovoltaic inverter testing system according to the testing data and the variation of the testing equipment;
the third calculation module is used for calculating the photovoltaic inverter variation of the complete photovoltaic inverter test system according to the test data;
the fourth calculation module is used for calculating the total variation of the whole photovoltaic inverter test system according to the test equipment variation, the test personnel variation and the photovoltaic inverter variation;
and the second obtaining module is used for obtaining an evaluation result of the complete photovoltaic inverter test system according to the test equipment variation, the test personnel variation, the photovoltaic inverter variation and the total variation.
9. The evaluation device of the complete photovoltaic inverter test system according to claim 8, wherein the first calculation module comprises:
the first constant unit is used for acquiring a first constant and a test equipment variation formula;
the first calculation unit is used for calculating a first range mean value of the complete photovoltaic inverter test system according to the test data;
and the second calculating unit is used for calculating the variation of the test equipment according to the first range mean value, the first constant and the test equipment variation formula.
10. A host computer, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of evaluating a photovoltaic inverter integrity test system as claimed in any one of claims 1 to 7.
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