Photovoltaic assembly hot spot temperature calculating method

Abstract

The invention discloses a photovoltaic assembly hot spot temperature calculating method comprising the following steps: 1, using ANSYS software to simulate a photovoltaic assembly; 2, inputting heat conduction coefficients of each material; 3, simulating that a random cell sheet of the solar battery is blocked, wherein the blocked cell sheet represents the first internal heat source causing hot spot effect; 4, setting boundary conditions and changing a blocking proportion; 5, inputting heat power of the first internal heat source, and calculating heating intensity and the temperature up limit value thereof; 6, simulating that the blocked cell sheet has a fault location, wherein the fault location represents the second internal heat source causing hot spot effect by uneven heating; 7, setting boundary conditions, and changing blocked proportion of the blocked cell sheet having the fault location; 8, inputting total heat power by summing the first and second internal heat source, and calculating the heating intensity and temperature up limit value of the blocked cell sheet having the fault location. The photovoltaic assembly hot spot temperature calculating method can fast and simply calculate photovoltaic assembly hot spot temperature, thus reducing hot spot generating risks.

Description

technical field [0001] The invention relates to a temperature calculation method, in particular to a method for calculating the hot spot temperature of a photovoltaic module, which belongs to the technical field of photovoltaic modules. Background technique [0002] With the rapid development of the domestic solar photovoltaic industry in recent years, and with the rapid growth of photovoltaic system installation capacity, the problems of operational safety and reliability of photovoltaic systems have gradually emerged. Among many photovoltaic failure modes, due to various dynamic shadow shading, local dust (snow) and automatic sun tracking system failures, the surface irradiation of photovoltaic modules is unevenly distributed, which in turn causes problems such as high temperature and hot spots of solar cells, which has become a photovoltaic failure mode. Significant cause of component failure. Under non-uniform irradiation, the output current of a single solar cell under...

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Problems solved by technology

[0004] However, the research on hot spot temperature rise for different types of reverse bias leakage current distribution of solar cells has not been systematically carried out

Typical solar cell defects, such as cell microcracks caused by mechanical loads, cell black chips caused by low-purity materials and cell technology, point defects caused by crystal dislocations, etc., may cause local high temperature of photovoltaic modules under the condition of non-uniform radiation distribution

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