A Method for Measuring Field Performance Degradation of Photovoltaic Modules by Geographic Region

Abstract

The invention discloses a method for measuring on-site performance degradation of photovoltaic modules according to geographic regions, which includes the following steps: 1) collecting power degradation data of photovoltaic modules and environmental factor data at the same period of operation; 2) establishing a model and solving the unknowns in the model Parameters; 3) Use partial derivatives to calculate the weight of each environmental factor affecting the power degradation of photovoltaic modules; 4) Determine the geographical area to which the calculation results are applicable through regional clustering. The invention establishes a model describing the relationship between the environmental factors and the output power degradation rate of the photovoltaic module, and realizes the quantitative measurement of the degree of influence on the environmental factors. Based on the regional clustering of environmental factors, the geographical area where the fitted model parameter values ​​and the corresponding environmental factor impact measurement results are applicable is determined, making it possible to analyze the on-site performance degradation of photovoltaic modules in a sub-regional manner under limited conditions. The invention can provide guidance for decision-making on site selection of photovoltaic power stations and targeted material selection and design 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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