Recently, a new study conducted by the University of New South Wales (UNSW) in Australia found that. About every five
University of New South Wales analysis of nearly 11,000 PV modules worldwide shows that a significant number of these modules are experiencing accelerated performance degradation. Researchers at the " point out that although these components are typically designed to last about 25 years under warranty, But may actually only operate for about 11 years , and its power generation output will drop by about 45% by the 25th year of operation.
Researchers point out that although the performance decay process of many components is smooth and predictable, after charting the data, it can be found that there is a "long tail" in the sample, in which some components fail or decay much faster than normal expectations . Yang Tang, a member of
the research team and author of the paper, said, "In the whole data set, we observed that the performance of photovoltaic power generation systems usually decreases by about 0 per year." The performance degradation rate of some photovoltaic power generation systems is very high. At least one in five systems has a decay rate of 1% of this typical level .
There are three main reasons that cause some components to fall into the "long tail interval":
one is the chain failure . That is to say, when a component fails, it will drag down the performance of the whole system through the "domino effect".
On the other hand, it is early and rapid failure . That is, some component problems are not detected and will stop working in the early stage of operation. This situation often occurs in newly commissioned components. There
is also the rapid decay caused by the accumulation of small defects. Such defects may not be apparent in the early stages and may not immediately affect operation, but over time, they may lead to a rapid decline in performance and eventually to a serious decline in power generation.
Researchers also point out that the environmental conditions of components have little effect on the "long tail phenomenon", which indicates that even in more extreme environments, such as high temperature areas, it does not necessarily increase the risk of failure.
Another researcher, Dr. However, after excluding the data from these high temperature areas, we still observed a similar long tail phenomenon in the probability distribution of performance decay rate under other climatic conditions. This shows that this problem is consistent regardless of the environment in which the component is running .
Poddar pointed out that the current test standards mainly examine the performance of components under mechanical stress, extreme temperature and ultraviolet radiation, and usually test humidity and standard sunshine conditions (AM1). However, in actual operation, the factors affecting the performance of components are far more than these, and the combination of multiple factors may lead to significant cascading failures.
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