CN113917255A - Inverter efficiency and power quality testing method - Google Patents
Inverter efficiency and power quality testing method Download PDFInfo
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- CN113917255A CN113917255A CN202111082486.4A CN202111082486A CN113917255A CN 113917255 A CN113917255 A CN 113917255A CN 202111082486 A CN202111082486 A CN 202111082486A CN 113917255 A CN113917255 A CN 113917255A
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- 238000012372 quality testing Methods 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000010248 power generation Methods 0.000 claims abstract description 25
- 238000007405 data analysis Methods 0.000 claims abstract description 9
- 238000007689 inspection Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a method for testing efficiency and power quality of an inverter, and relates to the technical field of inverters. The inverter efficiency and power quality testing method comprises the following steps: s1, respectively selecting a unit from good, medium and poor power generation according to the unit kW power generation amount in the operation period as a tested inverter; s2, respectively selecting 15 inverters of 3, 9 and 3 from the good inverter, the medium inverter and the poor inverter according to the data analysis result, respectively selecting the weighting efficiency of one test inverter from the 3 good inverters and the 9 medium inverters, and nesting the output electric quantity of the rest twelve inverters into a formula to calculate the conversion efficiency of the inverters. The inverters are extracted for testing according to the good, medium and poor three levels according to the unit kW power generation data result in the operation period, so that the sample size and the sample range of sampling investigation are enlarged, the subarray inverters with different power generation data are covered, the accuracy of the test result is improved, and the method is worthy of wide popularization.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to a method for testing efficiency and power quality of an inverter.
Background
The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally 220V,50Hz sine wave). The inverter is a DC to AC transformer, and is actually in a voltage inversion process with a converter, the converter converts the alternating voltage of a power grid into stable 12V direct current for output, and the inverter converts the 12V direct current voltage output by the Adapter into high-frequency high-voltage alternating current; both parts also employ a relatively versatile Pulse Width Modulation (PWM) technique.
At present, when the conversion efficiency of the inverter is detected, only a single machine is detected, the sample amount and the sample range of sampling investigation are small, the subarray inverter with different generated energy data cannot be covered, the test result is not persuasive, and the accuracy is low.
Disclosure of Invention
(I) technical problems to be solved by the invention
Aiming at the defects of the prior art, the invention provides a method for testing the efficiency and the power quality of an inverter, and solves the problem that when the conversion efficiency of the inverter is detected, only a single machine is detected, and the subarray inverter with different generated energy data cannot be covered, so that the test result is not persuasive.
(II) the technical scheme adopted by the invention
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for testing the efficiency of an inverter comprises the following steps:
s1, extracting a sample
Selecting power generation amount data of 22 sub-array inverters from the component comparison area, taking a single inverter as a unit, and selecting one unit from good, medium and poor power generation amounts as a tested inverter according to the unit kW power generation amount of the operation time period;
s2. calculating efficiency
The calculation formula of the unit kW power generation capacity of the inverter is as follows: the inverter unit kW generated energy is equal to the inverter AC output electric quantity/corresponding photovoltaic rated power, and the inverter conversion efficiency calculation formula is as follows: the conversion efficiency is output power/irradiance area 100%, 15 inverters of 3, 9 and 3 are respectively selected from good inverters, medium inverters and difference inverters according to the data analysis result, the weighting efficiency of a test inverter is respectively selected from the 3 good inverters and the 9 medium inverters, the output electric quantity of the rest twelve inverters is sleeved in an inverter conversion efficiency calculation formula to calculate the conversion efficiency of the inverters, namely the maximum conversion efficiency, harmonic waves and waveform distortion of each inverter can be calculated, and the maximum conversion efficiency, the harmonic waves and the waveform distortion of the inverter obtained through calculation are recorded in a table according to numbers.
Preferably, the method for testing the quality of the electric energy of the inverter comprises the following operations: one inverter is extracted from 3 good inverters, 9 medium inverters and 3 poor inverters respectively, three inverters are used, the three-phase voltage deviation, the average frequency deviation, the three-phase current total harmonic, the three-phase voltage unbalance and the direct current component of the three inverters are tested by an electric energy quality tester respectively, whether the test value is in a qualified range is judged, and the test value is recorded into a table according to the number after the test is finished.
Preferably, the inverter efficiency and power quality testing method includes the following operations: 19 series inverters and 3 centralized inverters are randomly extracted on site, and quality inspection and design matching inspection of installation positions are respectively carried out on the extracted 22 inverters.
Preferably, in the step S2, the selected 3 good inverters are named as D1-19, D2-18 and D3-7 respectively, the selected 9 medium inverters are named as D7-16, D8-21, D10-16, D11-17, D12-06, D13-19, D19-16, D19-17 and D20-07, and the selected 3 difference inverters are named as D21-18, D22-16 and D22-05 respectively.
Preferably, the inverters D3-7 and D8-21 test the inverter weighted efficiency, and the other 12 test inverters test the maximum conversion efficiency of the inverter.
Preferably, in the step S2, the data in the data analysis result refers to the unit kW power generation amount of the operation period.
(III) advantageous effects
The invention provides a method for testing efficiency and power quality of an inverter. The method has the following beneficial effects:
according to the method, 15 inverters which are 3, 9 and 3 in good, medium and poor inverters are selected from the results of the kW power generation amount in the unit operation time period, the weighting efficiency of one test inverter is selected from the 3 good inverters and the 9 medium inverters, the output power of the rest twelve inverters is sleeved in a formula to calculate the conversion efficiency of the inverters, namely the maximum conversion efficiency, harmonic waves and waveform distortion of each inverter can be calculated.
Drawings
Fig. 1 is a flowchart of a method for testing inverter efficiency according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a method for testing inverter efficiency, including the following steps:
s1, extracting a sample
Selecting power generation amount data of 22 sub-array inverters from the component comparison area, taking a single inverter as a unit, and selecting one unit from good, medium and poor power generation amounts as a tested inverter according to the unit kW power generation amount of the operation time period;
s2. calculating efficiency
The calculation formula of the unit kW power generation capacity of the inverter is as follows: the inverter unit kW generated energy is equal to the inverter AC output electric quantity/corresponding photovoltaic rated power, and the inverter conversion efficiency calculation formula is as follows: the conversion efficiency is output power/irradiance area 100%, 15 inverters of 3, 9 and 3 inverters are respectively selected from good, medium and difference according to the data analysis result, the weighting efficiency of a testing inverter is respectively selected from the 3 good inverters and the 9 medium inverters, the output electric quantity of the rest twelve inverters is sleeved in an inverter conversion efficiency calculation formula to calculate the conversion efficiency of the inverters, namely the maximum conversion efficiency, harmonic wave and waveform distortion of each inverter can be calculated, then the maximum conversion efficiency, harmonic wave and waveform distortion of the inverters obtained by calculation are recorded in a table according to the number, the inverters are respectively extracted according to the three levels of good, medium and difference according to the data result of the generated energy of a unit kW of the operation time period to test, the sample amount and the sample range of sampling investigation are enlarged, the subarray inverters with different data are covered, the accuracy of the test result is improved.
A method for testing the quality of inverter power, comprising the operations of: the method comprises the steps of extracting one inverter from 3 good inverters, 9 medium inverters and 3 poor inverters, judging whether a test value is in a qualified range or not by three inverters and respectively testing three-phase voltage deviation, average frequency deviation, three-phase current total harmonic, three-phase voltage unbalance and direct current components of the three inverters by using an electric energy quality tester, recording the test value into a table according to numbers after the test is finished, and extracting the inverters according to good, medium and poor three levels according to a data result of unit kW generated energy in an operation period to test.
An inverter efficiency and power quality testing method, a method for installing and detecting an inverter, comprises the following operations: and randomly extracting 19 series inverters and 3 centralized inverters on site, respectively carrying out quality inspection and inspection of the installation position of the extracted 22 inverters in conformity with the design, and mainly inspecting whether the shell of the inverter is complete, whether the installation position is correct and whether the wire connection is tight.
In the S2 step, the selected 3 good inverters are named as D1-19, D2-18 and D3-7 respectively, the selected 9 medium inverters are named as D7-16, D8-21, D10-16, D11-17, D12-06, D13-19, D19-16, D19-17 and D20-07, and the selected 3 poor inverters are named as D21-18, D22-16 and D22-05.
The inverter weighting efficiencies of the D3-7 inverter and the D8-21 inverter are tested, the maximum conversion efficiency of the other 12 inverters is tested, and the inverter weighting efficiency of the D3-7 inverter is 96.22 percent and the inverter weighting efficiency of the D8-21 inverter is 96.29 percent, which are all tested to be qualified. The maximum conversion efficiency of D1-19 is 97.65%, the maximum conversion efficiency of D2-18 is 97.43%, the maximum conversion efficiency of D7-16 is 97.33%, the maximum conversion efficiency of D10-16 is 97.45%, the maximum conversion efficiency of D11-17 is 97.32%, the maximum conversion efficiency of D12-06 is 97.56%, the maximum conversion efficiency of D13-19 is 97.58%, the maximum conversion efficiency of D19-16 is 97.38%, the maximum conversion efficiency of D19-17 is 97.34%, the maximum conversion efficiency of D20-07 is 97.69%, the maximum conversion efficiency of D21-18 is 97.31%, the maximum conversion efficiency of D22-16 is 97.79%, and the maximum conversion efficiency of D22-05 is 97.28%.
In the step S2, the data in the data analysis result refers to the kW power generation amount per unit of the operation period.
Example two:
as shown in fig. 1, an embodiment of the present invention provides a method for testing inverter efficiency, including the following steps:
s1, extracting a sample
Selecting power generation amount data of 22 sub-array inverters from the component comparison area, taking a single inverter as a unit, and selecting one unit from good, medium and poor power generation amounts as a tested inverter according to the unit kW power generation amount of the operation time period;
s2. calculating efficiency
The calculation formula of the unit kW power generation capacity of the inverter is as follows: the inverter unit kW generated energy is equal to the inverter AC output electric quantity/corresponding photovoltaic rated power, and the inverter conversion efficiency calculation formula is as follows: the conversion efficiency is output power/irradiance area 100%, 15 inverters of 3, 9 and 3 inverters are respectively selected from good, medium and difference according to the data analysis result, the weighting efficiency of a testing inverter is respectively selected from the 3 good inverters and the 9 medium inverters, the output electric quantity of the rest twelve inverters is sleeved in an inverter conversion efficiency calculation formula to calculate the conversion efficiency of the inverters, namely the maximum conversion efficiency, harmonic wave and waveform distortion of each inverter can be calculated, then the maximum conversion efficiency, harmonic wave and waveform distortion of the inverters obtained by calculation are recorded in a table according to the number, the inverters are respectively extracted according to the three levels of good, medium and difference according to the data result of the generated energy of a unit kW of the operation time period to test, the sample amount and the sample range of sampling investigation are enlarged, the subarray inverters with different data are covered, the accuracy of the test result is improved.
A method for testing the quality of inverter power, comprising the operations of: the method comprises the steps of extracting one inverter from 3 good inverters, 9 medium inverters and 3 poor inverters, judging whether a test value is in a qualified range or not by three inverters and respectively testing three-phase voltage deviation, average frequency deviation, three-phase current total harmonic, three-phase voltage unbalance and direct current components of the three inverters by using an electric energy quality tester, recording the test value into a table according to numbers after the test is finished, and extracting the inverters according to good, medium and poor three levels according to a data result of unit kW generated energy in an operation period to test.
An inverter efficiency and power quality testing method, a method for installing and detecting an inverter, comprises the following operations: and randomly extracting 19 series inverters and 3 centralized inverters on site, respectively carrying out quality inspection and inspection of the installation position of the extracted 22 inverters in conformity with the design, and mainly inspecting whether the shell of the inverter is complete, whether the installation position is correct and whether the wire connection is tight.
In the S2 step, the selected 3 good inverters are named as D1-19, D2-18 and D3-7 respectively, the selected 9 medium inverters are named as D7-16, D8-21, D10-16, D11-17, D12-06, D13-19, D19-16, D19-17 and D20-07, and the selected 3 poor inverters are named as D21-18, D22-16 and D22-05.
The inverter weighting efficiencies of the D3-7 inverter and the D8-21 inverter are tested, the maximum conversion efficiency of the other 12 inverters is tested, and the inverter weighting efficiency of the D3-7 inverter is 96.22 percent and the inverter weighting efficiency of the D8-21 inverter is 96.29 percent, which are all tested to be qualified. The maximum conversion efficiency of D1-19 is 97.65%, the maximum conversion efficiency of D2-18 is 97.43%, the maximum conversion efficiency of D7-16 is 97.33%, the maximum conversion efficiency of D10-16 is 97.45%, the maximum conversion efficiency of D11-17 is 97.32%, the maximum conversion efficiency of D12-06 is 97.56%, the maximum conversion efficiency of D13-19 is 97.58%, the maximum conversion efficiency of D19-16 is 97.38%, the maximum conversion efficiency of D19-17 is 97.34%, the maximum conversion efficiency of D20-07 is 97.69%, the maximum conversion efficiency of D21-18 is 97.31%, the maximum conversion efficiency of D22-16 is 97.79%, and the maximum conversion efficiency of D22-05 is 97.28%.
In the step S2, the data in the data analysis result refers to the kW power generation amount per unit of the operation period.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for testing the efficiency of an inverter is characterized in that: the method comprises the following steps:
s1, extracting a sample
Selecting power generation amount data of 22 sub-array inverters from the component comparison area, taking a single inverter as a unit, and selecting one unit from good, medium and poor power generation amounts as a tested inverter according to the unit kW power generation amount of the operation time period;
s2. calculating efficiency
The calculation formula of the unit kW power generation capacity of the inverter is as follows: the inverter unit kW generated energy is equal to the inverter AC output electric quantity/corresponding photovoltaic rated power, and the inverter conversion efficiency calculation formula is as follows: the conversion efficiency is output power/irradiance area 100%, 15 inverters of 3, 9 and 3 are respectively selected from good inverters, medium inverters and difference inverters according to the data analysis result, the weighting efficiency of a test inverter is respectively selected from the 3 good inverters and the 9 medium inverters, the output electric quantity of the rest twelve inverters is sleeved in an inverter conversion efficiency calculation formula to calculate the conversion efficiency of the inverters, namely the maximum conversion efficiency, harmonic waves and waveform distortion of each inverter can be calculated, and the maximum conversion efficiency, the harmonic waves and the waveform distortion of the inverter obtained through calculation are recorded in a table according to numbers.
2. The method for testing the electric energy quality of the inverter according to claim 1, wherein the method comprises the following steps: the method comprises the following operations: one inverter is extracted from 3 good inverters, 9 medium inverters and 3 poor inverters respectively, three inverters are used, the three-phase voltage deviation, the average frequency deviation, the three-phase current total harmonic, the three-phase voltage unbalance and the direct current component of the three inverters are tested by an electric energy quality tester respectively, whether the test value is in a qualified range is judged, and the test value is recorded into a table according to the number after the test is finished.
3. The inverter efficiency and power quality testing method according to claim 1, wherein: a method of installation detection for the inverter, comprising the operations of: 19 series inverters and 3 centralized inverters are randomly extracted on site, and quality inspection and design matching inspection of installation positions are respectively carried out on the extracted 22 inverters.
4. The inverter efficiency and power quality testing method according to claim 1, wherein: in the step S2, the selected 3 good inverters are named as D1-19, D2-18 and D3-7 respectively, the selected 9 medium inverters are named as D7-16, D8-21, D10-16, D11-17, D12-06, D13-19, D19-16, D19-17 and D20-07, and the selected 3 poor inverters are named as D21-18, D22-16 and D22-05.
5. The inverter efficiency and power quality testing method according to claim 4, wherein the inverter efficiency and power quality testing method comprises the following steps: the inverters D3-7 and D8-21 test the inverter weighted efficiency, and the other 12 test inverters test the maximum conversion efficiency of the inverter.
6. The inverter efficiency and power quality testing method according to claim 1, wherein: in the step S2, the data in the data analysis result refers to the kW power generation amount per unit operation period.
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- 2021-09-15 CN CN202111082486.4A patent/CN113917255A/en active Pending
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