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One trick to measure the problem component, the photovoltaic power station has a “infrared thermographic artifact”

Release time:2018-01-25

"The thermal imager is an ideal tool for quality control and on-site inspection in the process of production."

Installing solar energy on the roof can convert solar energy into electricity and then convert it into revenue - a solar power plant is a high return investment. But quality assurance is the key to ensuring high output and high returns for decades. As an important part of the solar power plant, solar components must be reliable and durable, and can continue to produce electric energy for several years.

Long-standing quality photovoltaic power plants, according to the quality inspection certification authority of the country has in many large-scale silicon PV power plant components. The survey found that PV module exists all kinds of quality problems, such as hot spots, cracked and power attenuation, brings the serious influence to the electric power generation, KPI index, station station receipts and daily maintenance.

Watch out for power plant stealth killer

The heat spot effect is known as one of the four major fire hazards of photovoltaic components. In the actual use of solar cells, if the temperature produced by the hot spot effect exceeds a certain limit, the solder joints on the battery components will melt and destroy the grid lines, resulting in the scrapping of the whole solar cell module. According to foreign authoritative statistics, the thermal spot effect makes the actual service life of the solar cell components less than 10%.

The heat spot effect on the component is usually caused by two types of external and internal reasons. The external reasons are common components of dust on the surface area of severe and uneven thickness, vegetation and the surrounding buildings or poles and other bird droppings, leaves, dirt, shadows of matrix components in front of the block, as well as the site is not flat, square things design space caused by the lack of self shadow, the component local illumination is lower than that of other normal parts the battery assembly is placed in the block or reverse bias, the power consumption of other batteries, and power in the form of heat release, leading to the cell temperature than other normal cell temperature. The heat spot caused by external factors is common in the photovoltaic power station, and can be eliminated in the daily operation and maintenance.

The manufacturing process and internal cause of components (especially welding and lamination), cell quality (reverse characteristics, edge leakage flow, large) have a relationship in the long-term reliability of diode junction box, backplane EVA and high temperature resistance and flame retardant ability and other factors, make the internal cause of the hot spot is due to congenital deficiency that will exist for a long time during the operation of the power station, a serious security risk of power plant reliability, power loss caused by any hot spots will limit the output power of the string.

How to detect the problem components accurately?

The German SOLON company has implemented the potential technology for the application of thermal imagers to the quality control and inspection of solar components. "We apply the FLIR infrared thermography to our R & D department and field operations," explains Oliver Frank, the SOLON R & D manager. The FLIR infrared thermograph plays an important role in ensuring the good quality of solar components in their life cycle.

SOLON was established in Berlin in 1997 and is a solar system provider active on the global platform. The company's main business involves photovoltaic power generation system, large roof installation system, and the planning and construction of the complete set of solar power generation, as well as the production of solar modules. SOLON group has established branches in Germany, Italy, France and the United States.

The components produced by the solar component manufacturers must be reliable and solid and can continue to run for decades. SOLON is not responsible for the production of solar cells, which means that SOLON companies have to carry out quality control. Frank explains: "SOLON is a manufacturer. To ensure that all solar modules meet our own high standards, we must first strictly test the quality of all solar cells and components. When testing solar component material, it mainly tests its ability of compression, temperature resistance, moisture resistance and so on. However, the important role of the thermal imager must be played to carry out the testing of the shunt and the conventional quality test of the solar cell. "

Frank continues to say: "in order to detect whether there is shunting before the forming of solar cells, we will apply the reverse bias to one of the batteries, and use the FLIR Systems infrared thermal imager to see its thermal imaging mode. The hot spot shows that the semiconductor material in the battery is defective in manufacturing, which leads to the emergence of partial current. This test ensures that the battery quality is higher than a certain level. "

The effect of infrared thermal imager is remarkable

The FLIR P65 infrared thermal imager is applied to this field by the R & D Department of the SOLON headquarters in Berlin. Frank is very satisfied with it. "In 2006, we bought this infrared thermograph, and it hasn't had any trouble yet. The effect of the thermal image shunt test on the quality test of the newly produced solar cells is very significant.

At present, the thermal imager used in shunting test is FLIR T650sc, and its thermal image resolution of the uncooled microcalorimetric detector is 640 * 480 pixels, and the thermal sensitivity is less than 20mK. The thermal imager also contains an automatic contrast optimization algorithm to facilitate the thermal analysis of specific objects. It also has interchangeable lenses and advanced camera features, so FLIR T650sc thermal infrared imager as solar cell shunt detection test is an ideal tool for well deserved.

Frank continued: "after the success of the R & D department, we bought two FLIR T series infrared thermographs and applied it to on-site inspection. These thermal imagers are small and light, fit for ergonomics and are suitable for on-site inspection. "

Volker Denzler, an expert on thermal imaging of the after-sales service department of SOLON, explains that the on-site inspection is responsible for the maintenance department. "Before we hand over solar power plants to customers, we will use these thermographs to check them to ensure that everything is intact. But we also provide monitoring, operation and maintenance services for the SOLON solar power plant buyers. "

Denzler continues to say, "the thermal imager has added a lot of convenience to our on-site inspection. Before we buy a FLIR infrared thermograph, we have to measure each battery plate by hand. As you can imagine, this approach is very time-consuming, especially for large devices. Even if you find the battery board where the problem is, you have to guess which or which batteries are in trouble.

Quick discovery of problems

"Through the infrared thermal imager of FLIR Systems, we can quickly find out which part of the component is having problems, and we can quickly find out what's wrong with the thermal image. There may be a variety of reasons for the problem of solar components, and the ways to solve each problem are different.

The hot spots on the thermal image illustrate the cause of the problem. In general, thermal anomalies indicate that the solar modules with problems appear to be losing electricity. In some cases, the hot spot temperature may be very high, which is regarded as a potential safety hazard. But these problems can be solved in general. "We find that the cause of the problem is generally in connection with the problem of connection. As time goes on, power connections sometimes degenerate slightly, but these problems can generally be solved easily. "

The thermograph helps to find out the cause of the problem

Other reasons for battery failure and damage are damaged glass layer, failure of bypass diodes, shadow and so on. Denzler explains: "the FLIR infrared thermograph is a good tool to find out the problems in the market and answer the reasons for the decline in the output of the components. Especially when the bypass diode is defective, it is difficult to detect the problem if the assumption is caused by lightning. But the diode defect can be clearly displayed on the thermal image. Such examples are too numerous to enumerate. No matter what causes the failure of the solar component, it is a very important step to find the temperature mode of the solar component.

Denzler is not only concerned with the component itself. "We will check the entire device, including cables, connectors, boxes and inverters. These infrared thermal imagers of FLIR Systems are also an ideal tool for conventional maintenance of the power system. "


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