Calculation method of hot spot power loss of photovoltaic modules based on i-v curve

Abstract

The invention discloses a method for calculating the hot spot power loss of a photovoltaic module based on the I-V curve. Firstly, the I-V output characteristic curve of the photovoltaic module is extracted and the working current and working voltage of the module are read, and the calculation method is calculated by analyzing the I-V curve. The reverse bias power loss of the hot spot cell; then by calculating the photoelectric conversion efficiency of the photovoltaic module and testing the maximum output power of the photovoltaic module in the string, the photoelectric conversion power loss of the hot spot cell is calculated; the sum of the two is the total power of the hot spot loss. This method can accurately calculate the hot spot power loss of photovoltaic modules, has the advantages of real-time, economical and fast, and can be applied to arrays of various scales, and its calculation results can be used to evaluate the severity of hot spots, improve the safety and security of photovoltaic systems reliability.

Description

Calculation method of photovoltaic module hot spot power loss based on I‑V curve technical field The present invention relates to a kind of power loss calculation method, particularly relate to a kind of photovoltaic module thermal based on I-V curve A method for calculating spot power loss belongs to the technical field of photovoltaic modules. Background technique [0002] With the development of the photovoltaic industry and the long-term operation of photovoltaic systems, various failure problems of photovoltaic modules have gradually exposed. Hot spots due to power mismatch between cells due to shadow occlusion, foreign matter coverage, or cell defects is the most common component failure. Hot spots will not only cause power loss of components, but also burn through components in severe cases. of fire. In order to reduce the harm caused by the hot spot failure and avoid the fire caused by the battery heating, it is necessary to regularly hot spot detection an...

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Problems solved by technology

This method does not consider the influence of operating current changes on power loss, the calculated value is not accurate, and it is limited to the need for faulty components in the string

[0005] The method for detecting hot spots of photovoltaic modules through infrared image processing mentioned in the Chinese patent "Rapid Detection System and Method for Photovoltaic Array Hot Spots Based on Infrared Image Processing" (publication number: CN105720917A), but for large-scale photovoltaic arrays, this method consumes The longer the time, the lower the accuracy and the higher the detection cost

[0006] The Chinese patent "A Method for Calculating Hot Spot Temperature of Photovoltaic Modules" (publication number: CN106066916A) proposes a method for estimating the temperature of hot spot cells through a thermal simulation model. The calculation of hot spot power loss mentioned in this method does not include photoelectric conversion Power loss, and does not give the determination method of the parameters in the calculation formula

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