CN103353576A - Photovoltaic module power generation measurement method based on volt-ampere characteristic curve - Google Patents
Photovoltaic module power generation measurement method based on volt-ampere characteristic curve Download PDFInfo
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- CN103353576A CN103353576A CN2013102441930A CN201310244193A CN103353576A CN 103353576 A CN103353576 A CN 103353576A CN 2013102441930 A CN2013102441930 A CN 2013102441930A CN 201310244193 A CN201310244193 A CN 201310244193A CN 103353576 A CN103353576 A CN 103353576A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a photovoltaic module power generation measurement method based on a volt-ampere characteristic curve. The method is characterized in that test equipment possessing continuous photovoltaic module testers is used; software is used to control a time interval of continuous tests and a continuous automatic volt-ampere characteristic curve test is performed; the volt-ampere characteristic test curve is used to determine current maximum output power of the module; accumulation operation is performed on a power value and the time so that the curve of changes along with the time of the maximum power of the photovoltaic module within the certain time is drawn; the accumulated power generation is calculated.
Description
Technical field
The present invention relates to the photovoltaic field tests, be specially a kind of photovoltaic module generated energy measuring method based on volt-ampere characteristic.
Background technology
The volt-ampere characteristic test is the method for testing of test light photovoltaic assembly various performance parameters, and the generated energy of photovoltaic module test normally outdoor natural light according under, utilize the test circuit of inverter self or additional other electric current and voltage meter apparatus to carry out real-time generated energy monitoring under the photovoltaic module duty.We illustrate the method for testing of generation current amount as an example of inverter example.At the positive and negative electrode of the input end of inverter access photovoltaic module, inverter changes the electric current and voltage output characteristics of photovoltaic module by the maximal power tracing algorithm, makes photovoltaic module remain at the maximum power output state.Then pass through photovoltaic module voltage, the current parameters of built-in electric current and voltage test circuit test input, thereby calculate current realtime power, then sample by certain time interval, thereby accumulation obtains the generated energy summation of assembly within a period of time.The generated energy test of carrying out photovoltaic module by inverter is the effective way that extensively adopts at present, but the method is subjected to the impact of different manufacturers inverter maximal power tracing algorithm, larger skew can appear in the maximum power point of assembly, can not truly reflect the generated energy of assembly under actual environment.
In addition the at present measurement of assembly property be mostly standard STC environment (25 ℃, 1000W/m
2Irradiance, AM1.5 spectroscopic light source) the maximum power value Pmax under, but assembly is when outside work, and the conditions such as environment temperature and irradiance are different, need to have a kind of more scientific method to weigh the characteristic of assembly.The test of assembly generated energy is weighed sign as assembly property and is accepted by more people at present, also needs to have better more accurately method to carry out reliably the test of repeatability.
Summary of the invention
The purpose of this invention is to provide a kind of photovoltaic module generated energy measuring method based on volt-ampere characteristic, descend in working order the generated energy of test light photovoltaic assembly can be subject to load and the impact of maximum power control strategy, the problem that the reliability of test result is a greater impact to solve prior art.
In order to achieve the above object, the technical solution adopted in the present invention is:
Photovoltaic module generated energy measuring method based on volt-ampere characteristic, it is characterized in that: utilize the photovoltaic module Testing Instrument for Volt-ampere Characteristic, in a plurality of identical continuous time intervals that fixedly reach, measure the volt-ampere characteristic of photovoltaic module to be measured, and carry out the next measuring condition of testing according to current test curve and set, comprise maximum current test specification and sampling spot set positions, improve test accuracy.Find out photovoltaic module peak power to be measured corresponding in each time interval according to volt-ampere characteristic after each test, and draw out the time dependent curve of photovoltaic module peak power to be measured.Again photovoltaic module peak power to be measured and the time interval in each time interval are multiplied each other and obtain the generated energy of photovoltaic module to be measured in each time interval, then the generated energy of photovoltaic module to be measured in the continuous time interval is accumulated computing, obtain the accumulated generation amount of photovoltaic module to be measured in the continuous time interval, show at last the accumulated generation value in a period of time.
Described photovoltaic module generated energy measuring method based on volt-ampere characteristic is characterized in that: the described time interval can be adjusted from 1 second to 30 minutes according to the measuring accuracy needs.
The present invention is by measure continuous volt-ampere characteristic in Fixed Time Interval, obtain the comparatively accurately maximum power value of photovoltaic module under outdoor different conditions, by obtaining obtainable more accurately the generate electricity value of photovoltaic module under the outside work condition with the time integral mode, because the time interval is selected can improve the accuracy index of follow-on test to as far as possible little to a second level.
The invention has the beneficial effects as follows, novel assembly generated energy method of testing is provided, and improved the accuracy of test, can formulate for the examination criteria of photovoltaic as standard method of measurement foundation is provided.
Description of drawings
Fig. 1 is volt-ampere characteristic synoptic diagram among the present invention.
Fig. 2 is generated energy test synoptic diagram.
Embodiment
Tested photovoltaic module is placed on outdoor unscreened position, positive and negative connection terminal is connected to respectively the test input of photovoltaic module Testing Instrument for Volt-ampere Characteristic.Utilize the photovoltaic module Testing Instrument for Volt-ampere Characteristic, in a plurality of identical continuous time intervals that fixedly reach, measure the volt-ampere characteristic of photovoltaic module to be measured, and carry out the next measuring condition of testing according to current test curve and set, comprise maximum current test specification and sampling spot set positions, improve test accuracy.Find out photovoltaic module peak power to be measured corresponding in each time interval according to volt-ampere characteristic after each test, and draw out the time dependent curve of photovoltaic module peak power to be measured.Again photovoltaic module peak power to be measured and the time interval in each time interval are multiplied each other and obtain the generated energy of photovoltaic module to be measured in each time interval, then the generated energy of photovoltaic module to be measured in the continuous time interval is accumulated computing, obtain the accumulated generation amount of photovoltaic module to be measured in the continuous time interval, show at last the accumulated generation value in a period of time.
As shown in Figure 1, utilization tests out photovoltaic module volt-ampere characteristic such as figure from Testing Instrument for Volt-ampere Characteristic, utilize software to find out wherein maximum power point Pmax, and obtain short-circuit current Isc, as the maximum current test specification of next time test, and according to the testing current scope current sampling interval is set on average and arranges.As shown in Figure 2, horizontal ordinate is the test duration, and Δ t just sets when the test beginning, can not change in the test process.Ordinate is the maximum power point Pmax that finds at curve after each volt-ampere characteristic test curve generates.After the time interval through Δ t1, can produce two test point Pmax.0 and Pmax.1.Consider that the time interval is enough little, and the variation of powertrace satisfies the normal distribution characteristics, the average power content in the Δ t1 directly adopts Pmax.1, as shown in FIG. the generated energy E1=Pmax.1* Δ t in the Δ t1.Accumulated generation amount in the whole test duration just can be designated as E=Pmax.1* Δ t+ Pmax.2* Δ t+ ... + Pmax.N* Δ t.
Claims (2)
1. based on the photovoltaic module generated energy measuring method of volt-ampere characteristic, it is characterized in that: utilize the photovoltaic module Testing Instrument for Volt-ampere Characteristic, in a plurality of identical continuous time intervals that fixedly reach, measure the volt-ampere characteristic of photovoltaic module to be measured, and carry out the next measuring condition of testing according to current test curve and set, comprise maximum current test specification and sampling spot set positions, improve test accuracy; Find out photovoltaic module peak power to be measured corresponding in each time interval according to volt-ampere characteristic after each test, and draw out the time dependent curve of photovoltaic module peak power to be measured; Again photovoltaic module peak power to be measured and the time interval in each time interval are multiplied each other and obtain the generated energy of photovoltaic module to be measured in each time interval, then the generated energy of photovoltaic module to be measured in the continuous time interval is accumulated computing, obtain the accumulated generation amount of photovoltaic module to be measured in the continuous time interval, show at last the accumulated generation value in a period of time.
2. the photovoltaic module generated energy measuring method based on volt-ampere characteristic according to claim 1, it is characterized in that: the described time interval can be adjusted from 1 second to 30 minutes according to the measuring accuracy needs.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104716902A (en) * | 2015-02-27 | 2015-06-17 | 北京天诚同创电气有限公司 | Device and method for measuring maximum power of photovoltaic module and method for measuring generated energy |
| CN104933305A (en) * | 2015-06-12 | 2015-09-23 | 中国电子科技集团公司第四十一研究所 | Method for evaluating declination proportion of photovoltaic array power generation quantity due to abnormal factors |
| CN106533360A (en) * | 2016-11-01 | 2017-03-22 | 常州天合光能有限公司 | Portable outdoor power test device and test method for photovoltaic assemblies |
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| CN104716902A (en) * | 2015-02-27 | 2015-06-17 | 北京天诚同创电气有限公司 | Device and method for measuring maximum power of photovoltaic module and method for measuring generated energy |
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| CN106533360A (en) * | 2016-11-01 | 2017-03-22 | 常州天合光能有限公司 | Portable outdoor power test device and test method for photovoltaic assemblies |
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Effective date of registration: 20190328 Address after: 266555 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: China Electronics Technology Instrument and Meter Co., Ltd. Address before: 233010 No. 726 Huaguang Avenue, Bengbu City, Anhui Province Patentee before: The 41st Institute of CETC |
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