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Acceleration factor calculation method based on temperature change in thermal cycle

A technology of acceleration factor and temperature change, applied in the direction of calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as cumulative damage of photovoltaic modules, impact on service life evaluation, etc., and achieve the effect of accurate evaluation and accurate measurement results

Inactive Publication Date: 2020-09-18
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the present invention provides an acceleration factor calculation method based on temperature changes in the thermal cycle, which solves the problem of photovoltaic modules being exposed to harsh outdoor environments for a long time, continuous high and low temperatures or large temperature differences. The problem of irreversible cumulative damage that affects service life estimates

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  • Acceleration factor calculation method based on temperature change in thermal cycle
  • Acceleration factor calculation method based on temperature change in thermal cycle
  • Acceleration factor calculation method based on temperature change in thermal cycle

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Embodiment

[0085] In the IEC61215 standard thermal cycle test experiment, the schematic diagram of the thermal cycle is as follows Figure 4 As shown, the specific values ​​of each parameter are as follows:

[0086]

[0087]

[0088] Among them, E A is the material activation energy of the test component, K is the Boltzmann constant, T 0 is the test start temperature, ΔT is the maximum temperature difference of IEC61215 standard thermal cycle test, T s is the maximum temperature in the thermal cycle, t 1 is the stop time of the first cooling, t 2 is the low temperature continuous stop time, t 3 is the first heating stop time, t 4 is the high temperature continuous stop time, t 5 is the stop time of the second cooling, t all is the total time of a single IEC61215 standard thermal cycle test, C 1 is the hazard rate at different temperatures, p 1 ,p 2 is the shape parameter of the heating / cooling ramp.

[0089] In this IEC61215 standard thermal cycle test experiment, there ...

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Abstract

The invention discloses an acceleration factor calculation method based on temperature change in a thermal cycle, and the method comprises the steps: analyzing the temperature change in the thermal cycle, and obtaining a temperature model in the thermal cycle; analyzing the acceleration factor at any moment in the thermal cycle to obtain an acceleration factor model based on temperature change inthe thermal cycle; analyzing the influence of the temperature on the activation energy of the material to obtain an activation energy model based on temperature change in the thermal cycle; and calculating to obtain an acceleration factor in the thermal cycle by combining the three models. According to the method, the influence of temperature change on the activation energy characteristics of thematerial and the influence of additional stress generated by different expansion and contraction rates of the material due to change of heating and cooling rates on the material are considered, so that the measurement result of the acceleration factor of the photovoltaic module is more accurate, and the service life of the photovoltaic module is evaluated more accurately.

Description

technical field [0001] The invention relates to the technical field of reliability evaluation of photovoltaic modules, in particular to a method for calculating acceleration factors based on temperature changes in thermal cycles. Background technique [0002] The safety and reliability of solar photovoltaic modules will directly determine the safety and reliability of the entire photovoltaic system. However, for high-reliability products such as photovoltaic modules, design defects, early degradation problems caused by material or processing problems usually do not appear until the first few years after the module is put into service. What's more, the failure and loss of performance of many reliably manufactured PV modules is due to the gradual cumulative damage caused by long-term exposure to the harsh outdoor environment. These processes take place on a relatively long time scale. Therefore, it is not advisable to obtain the reliability of photovoltaic modules and related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/02G06F119/08
CPCG06F30/20G06F2119/02G06F2119/08
Inventor 王磊王润森伍敏燕赵小炫张臻
Owner HOHAI UNIV CHANGZHOU
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