Method for evaluating reliability of photovoltaic array

Abstract

The invention provides a reliability evaluation method for a photovoltaic array. The reliability evaluation method comprises the following steps: acquiring historical data; taking the ratio of the actual generating capacity to the theoretical generating capacity of the photovoltaic array within a period of time as a preliminary index of the performance of the photovoltaic array; correcting the initial index to obtain a corrected final index data set; obtaining a probability density function value corresponding to each photovoltaic array; and taking the ratio of the maximum probability density function value of the target photovoltaic array to the maximum probability density function value in all the photovoltaic arrays as the reliability evaluation value of the target photovoltaic array. According to the method, the reliability of the photovoltaic array can be intuitively reflected, the evaluation index is easy to understand, and the method has important significance for improving the operation and maintenance efficiency of a photovoltaic power station and evaluating the performance of the photovoltaic array.

Description

A Reliability Evaluation Method for Photovoltaic Arrays technical field The invention belongs to the technical field of photovoltaic array performance evaluation, and is specifically related to a reliability evaluation method of photovoltaic arrays. Law. Background technique [0002] In recent years, the photovoltaic industry has developed rapidly. However, as an important part of photovoltaic power plants, photovoltaic arrays have long-term Various failures are prone to occur when exposed to outdoor and harsh environments. At the same time, due to the series-parallel structure of the photovoltaic array, a module Failure will reduce the efficiency of the entire array, affect the performance of the power plant, and even threaten the safety of the photovoltaic power plant. Therefore, the array The reliability of the column is the key to ensure the operation status of the entire power station, and it is of great significance to establish a performance evaluation model ...

AI Technical Summary

Problems solved by technology

However, in actual engineering, since the calculation of PR value is related to variables such as irradiance and output power, the output of photovoltaic arrays usually fluctuates greatly and has no rules to follow. It is very easy to cause misjudgment by directly using PR for fault diagnosis and performance evaluation.

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