Method for measuring field performance degradation of photovoltaic module according to geographic area

Abstract

The invention discloses a method for measuring field performance degradation of a photovoltaic module according to a geographic area. The method comprises the following steps: 1) collecting power degradation data of the photovoltaic module and environmental factor data of an operation site in the same period; 2) establishing a model and solving unknown parameters in the model; 3) calculating the weight of each environmental factor influencing the power degradation of the photovoltaic module by using the partial derivative; and 4) determining a geographic area suitable for a calculation result through area clustering. According to the method, the model for describing the relationship between the environmental factors and the output power degradation rate of the photovoltaic module is established, and the quantitative measurement of the influence degree of the environmental factors is realized. On the basis of regional clustering of environmental factors, a model parameter value obtained by fitting and a geographic region suitable for a corresponding environmental factor influence measurement result are determined, so that regional refined analysis of the field performance degradation of the photovoltaic module under a limited condition becomes possible. The method can provide guidance for photovoltaic power station site selection decision and problems of targeted material selection, design and the like of photovoltaic modules in different regions.

Description

technical field [0001] The invention relates to the field of performance evaluation of photovoltaic modules, in particular to a method for measuring field performance degradation of photovoltaic modules according to geographic regions. Background technique [0002] With the increase of world population and the development of society, energy consumption is gradually increasing. Considering the impact of traditional energy, such as petroleum, on the environment, it has become a consensus in the world to vigorously develop clean and renewable energy. Among all renewable energy sources, solar energy has attracted widespread attention due to its abundant and sustainable sources. Since the photovoltaic power generation effect was first discovered in the 19th century, photovoltaic power generation technology has developed rapidly. [0003] In the whole photovoltaic power generation device, the photovoltaic module is generally considered to be the most important part, which direct...

AI Technical Summary

Problems solved by technology

However, the real problem is that the actual operating environment of photovoltaic modules is significantly different from the standard test conditions, and the environmental conditions between different geographical locations are also different, resulting in different types of failure modes and different performance degradation rates.

Therefore, how to accurately evaluate the performance degradation of photovoltaic modules in the real operating environment and measure the specific impact of environmental factors on its performance degradation has important research and application value, but research on this aspect is still relatively lacking

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