With the end of the 630 and 930 PV projects, there are more and more outdoor test jobs for PV inverters. How to quickly and efficiently test inverter efficiency, how to find a suitable test tool? Here will find the answer for you.
According to the survey of relevant institutions, China's PV installed capacity ranks first in the world, and the newly installed grid-connected capacity is 34.5GW, an increase of 127%. The global output of all links in the photovoltaic industry chain is over 50%, ranking first in the world. As we all know, the photovoltaic industry is an emerging industry combining semiconductor technology and new solar energy, and is an important field of international energy competition.
Therefore, it is not difficult to conclude that the development of the photovoltaic industry will lead the boom in the modern energy field; therefore, the research on photovoltaic inverters at home and abroad will be even more birthday, and there will be a certain increase in the demand and installation of photovoltaic inverters. .
Figure 1 data source: public information, Zhiyan consulting
With the increase in the number of photovoltaic inverters and the increasing use of applications, we cannot ignore a problem - how to test PV inverters after installation?
Photovoltaic inverters are carried out in the laboratory during the development and production process, and there are many test equipment that can be used. For example, oscilloscopes, multimeters, power analyzers, high temperature test chambers, safety inspection equipment, etc., which are common in R&D testing. In the production process, there will be corresponding test equipment or test system available. In the laboratory or factory stage, PV inverters need to test more projects, such as MPPT voltage range detection, MPPT tracking accuracy detection, efficiency detection, grid-connected current harmonic detection, DC component detection and so on.
figure 2
However, by the actual stage of the installation, given the objective conditions, we will be able to use fewer inspection equipment. For example, in the outdoor area below, it is difficult for us to have a proper orientation to take power to start the test equipment, but it is necessary to check or simply check the fault before and after the equipment is used.
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At this point, engineers often drag a long and long power supply line, lift a larger device to do a simple check on its related electrical parameters, or take out the multimeter with you to see if the components are damaged. Either way, it brings a lot of trouble to engineers who are testing or troubleshooting on site.
With the impact of the entire photovoltaic industry on traditional power systems, a brief check of the electrical parameters of the inverter has been added to the power quality analyzer. The following figure shows the inverter detection parameters and interface of the power quality analyzer E6500 used by some power after-sales engineers:
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At present, there are more PV power plants using the E6500 to test:
Figure 6
In summary, the E6500 itself also includes recording functions commonly used in the power industry such as recording and detection. It is easy to view and analyze offline data with the PC software. At the same time, the E6500 is also small in size (263*168*65cm3) and easy to carry (2kg). It has a small advantage in actual testing, and it will become a tool for testing non-PV inverters and photovoltaic power plants.
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