CN110095736B - Inverter MPPT tracking efficiency outdoor test method - Google Patents
Inverter MPPT tracking efficiency outdoor test method Download PDFInfo
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- CN110095736B CN110095736B CN201910501140.XA CN201910501140A CN110095736B CN 110095736 B CN110095736 B CN 110095736B CN 201910501140 A CN201910501140 A CN 201910501140A CN 110095736 B CN110095736 B CN 110095736B
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- 238000010998 test method Methods 0.000 title abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 230000035772 mutation Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009533 lab test Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 238000003491 array Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses an outdoor testing method for MPPT (maximum power point tracking) tracking efficiency of an inverter, which is characterized in that a group-string type online IV tester is adopted to carry out online IV testing on a certain branch of a group-string type inverter in a grid-connected state, the output voltage and the output current value at the grid-connected moment are recorded at the IV curve scanning and switching moment, the Pmp value of MPPT tracking to the maximum power point and the swept surface of an IV curve is calculated, and then the MPPT tracking efficiency of the inverter is calculated. The invention realizes the outdoor test method of the MPPT tracking efficiency of the string inverter, can quickly test the MPPT tracking efficiency of the inverter in the actual production process, saves the process of laboratory inspection, saves time and reduces workload, has certain accuracy and improves the test efficiency. The method fills the blank of the inverter MPPT tracking efficiency outdoor test method, and is the first set of existing outdoor test method.
Description
Technical Field
The invention relates to an outdoor testing method for MPPT (maximum power point tracking) tracking efficiency of an inverter.
Background
With the shortage of global energy and climate warming, renewable energy such as solar power generation gradually replaces the traditional thermal power generation, and becomes a hotspot and development trend of the research in the energy field at present. In a solar power generation system, an inverter is used as very important electrical equipment in the whole solar photovoltaic system, the MPPT tracking efficiency of the inverter directly influences the total output of a photovoltaic module, and the MPPT tracking efficiency has great influence on the power generation capacity. At present, the MPPT tracking efficiency of the inverter only stays in a laboratory test. Photovoltaic simulators are used to directly simulate photovoltaic arrays of various types and configurations in a laboratory test environment, and more particularly, the photovoltaic simulators are used to simulate real working conditions of high intensity for a long time under static conditions (i.e. a given IV curve is kept unchanged during a test) or limited low-intensity changes (e.g. switching between two or more given IV curves during a test).
Under the actual working condition, the photovoltaic array IV curve is more frequently changed without a fixed rule in the test process under the influence of the tested meteorological conditions, and the test can more intuitively reflect the dynamic MPPT tracking performance of the inverter. The MPPT tracking efficiency test under the outdoor working condition has no complete set of test method. Therefore, an outdoor test method for the MPPT tracking efficiency of the inverter needs to be researched, and convenience of field test of a power station is improved.
At present, the MPPT tracking efficiency test of the inverter only has laboratory test, and a photovoltaic simulator simulates outdoor working conditions. Because the outdoor actual working condition can not be completely simulated, the MPPT tracking efficiency test result of the inverter is more different from the actual working condition, the test result of different laboratory equipment can not completely represent the actual climatic conditions of different regions, and the test deviation is easily caused to be larger. The method adopts the actual working condition to carry out the test, the test result completely accords with the conditions of weather, temperature and the like of the place of the power station, and the reliability of the test result is improved. There is currently no outdoor test method but only a laboratory test method.
Disclosure of Invention
The invention aims to solve the problems that: the existing method for testing the MPPT tracking efficiency of the inverter can only be carried out in a laboratory and cannot be used for testing outdoors.
In order to solve the problems, the invention provides an outdoor testing method for inverter MPPT tracking efficiency, which is characterized in that a group-string type online IV tester is adopted to carry out online IV testing on a certain branch of a group-string type inverter in a grid-connected state, the output voltage and the output current value at the grid-connected moment are recorded at the moment of IV curve scanning and switching, the Pmp value of the MPPT tracking to the maximum power point and the swept surface of an IV curve is calculated, the inverter MPPT tracking efficiency is calculated, and the calculation formula of the inverter MPPT tracking efficiency eta is as follows:
wherein, UoutIs the output voltage at the present moment, IoutAnd Pmp is the maximum power point of the output IV curve, which is the output current value at the current moment. The conventional laboratory test has the problem that because the test IV curve is generated by a photovoltaic simulator, Pmp is a determined value which does not need to be tested, while the outdoor test requires a synchronous test of the current IV curve to determine the actual value of Pmp in the current IV curve.
Preferably, the online IV tester adopts a millisecond-level serial online IV tester to ensure that the output voltage and the output current do not change suddenly in a test period, and simultaneously, high-precision output voltage and output current data are acquired in a very short time.
Preferably, the test time of the online IV tester is a maximum value that ensures that the inverter power does not suddenly change. The test time window is required to be controlled to find out a balance point, so that the test time can be ensured to ensure the accuracy of the test result, and the test time is also required to be controlled to ensure that the power is not subjected to sudden change, so that the test result is closer to the true value.
Compared with the prior art, the invention realizes the outdoor test method of the MPPT tracking efficiency of the string inverter, can quickly test the MPPT tracking efficiency of the inverter in the actual production process, saves the process of laboratory inspection, saves time and workload, has certain accuracy and improves the test efficiency. The method fills the blank of the inverter MPPT tracking efficiency outdoor test method, and is the first set of existing outdoor test method.
Drawings
Fig. 1 is a flowchart of an outdoor testing method for tracking efficiency of an inverter MPPT according to the present invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, the inverter MPPT tracking efficiency outdoor test method provided in this embodiment is implemented by performing an online IV test on a branch of a string inverter in a grid-connected state by using a millisecond-class string online IV tester, and recording an output voltage and an output current value at a grid-connected moment at an IV curve scanning and switching moment, and calculating a Pmp value obtained by tracking the MPPT to a maximum power point and an IV curve scanned surface, thereby calculating the inverter MPPT tracking efficiency, where a calculation formula of the inverter MPPT tracking efficiency η is:
wherein, UoutIs the output voltage at the present moment, IoutPmp is the maximum power point of the output IV curve for the output current at the present moment. The testing time of the online IV tester is the maximum value which ensures that the power of the inverter does not generate sudden change.
In this embodiment, 0.1 second is the maximum value of the inverter power that does not change, and Pmp is 1000W, U measured in 0.1 secondoutIs 100V, IoutAt 9.85A, the MPPT tracking efficiency η of the inverter is:
Claims (1)
1. the outdoor testing method for the MPPT tracking efficiency of the inverter is characterized in that a string type online IV tester is adopted to perform online IV testing on a certain branch of the string type inverter in a grid-connected state, the output voltage and the output current value at the moment of grid connection are recorded at the moment of IV curve scanning and switching, the Pmp value of the MPPT tracking to the maximum power point and the Pmp value scanned by the IV curve are calculated, then the MPPT tracking efficiency of the inverter is calculated, and the calculation formula of the MPPT tracking efficiency eta of the inverter is as follows:
wherein, UoutIs the output voltage at the present moment, IoutThe output current value at the current moment is Pmp, and Pmp is the maximum power point of the output IV curve;
the test time of the online IV tester is the maximum value which ensures that the power of the inverter does not generate mutation; the online IV tester adopts a millisecond-level serial online IV tester.
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| KR101089906B1 (en) * | 2010-04-02 | 2011-12-05 | 성균관대학교산학협력단 | Maximum power point tracker, power conversion controller, power inverter of insulating structure, and method for maximum power point tracking of power inverter |
| CN103631308B (en) * | 2013-10-28 | 2016-01-20 | 天门格润科技发展有限公司 | Based on the track algorithm without DC current sensor miniature photovoltaic grid-connected inverter |
| CN104362977B (en) * | 2014-11-06 | 2016-08-31 | 国家电网公司 | Bimodal dynamically/static MPP of a kind of photovoltaic DC-to-AC converter follows the tracks of Efficiency test method |
| CN105785281A (en) * | 2014-12-18 | 2016-07-20 | 国家电网公司 | Photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device |
| CN106203879B (en) * | 2016-07-19 | 2019-11-08 | 上能电气股份有限公司 | A kind of photovoltaic power station system efficiency calculation method |
| CN106597151B (en) * | 2016-12-02 | 2021-01-15 | 中国电力科学研究院有限公司 | Photovoltaic power station switched inverter tracking efficiency testing method and system |
| CN109088598A (en) * | 2018-06-29 | 2018-12-25 | 汉能移动能源控股集团有限公司 | Method, device and equipment for testing maximum power point tracking efficiency of mobile energy |
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