Prediction method of temperature characteristics of concentrating photovoltaic modules with tunnel junction mechanism

Abstract

The invention discloses a method for predicting the temperature characteristics of a concentrating photovoltaic module that introduces a tunnel junction mechanism. The invention simplifies the 3D distributed circuit tunnel junction model into a two-dimensional lumped model, that is, the tunnel junction is equivalent to a circuit element , taking the dual-diode model of a concentrating triple-junction cell as an example, the tunnel junction equivalent model is used to replace the equivalent series resistance, and a clear The circuit relation formula determines the initial value of each parameter, and extracts several sets of parameter values ​​through mathematical iterative fitting, and then compares them with the experimental measurement results to obtain the best parameter set to make the I‑V characteristic curve fitting convergence of the module better Well, reasonable estimation of the I‑V characteristic curve of the module under high concentration conditions will not only help people better understand the working mechanism of the tunnel junction, but also improve the optimization efficiency of MJSC and reduce the MJSC design and optimization costs.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a method for predicting the temperature characteristics of a concentrated photovoltaic module that introduces a tunnel junction mechanism. Background technique [0002] High-power concentrating photovoltaic power generation technology is becoming a main direction of photovoltaic technology development, how to effectively improve the photoelectric conversion efficiency of solar cells has become one of the scientific research problems to be solved urgently. In recent years, multi-junction solar cells (MJSCs) have developed rapidly due to their advantages of high efficiency, low energy consumption, and low cost, and have been widely used in high-power concentrated photovoltaic systems. Tunnel junction is an important unit in multi-junction solar cells (MJSC), which is used to realize low-resistance connections between sub-cells, and its performance ...

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Problems solved by technology

[0005] In order to solve the above technical problems, the main purpose of the patent of the present invention is to provide a prediction model for the temperature characteristics of the concentrating photovoltaic module that introduces the tunnel junction mechanism. Optimized to make it more in line with the experimental measurement data to ensure its accuracy and reliability. On the other hand, it solves the problem of inaccuracy of the model under high-power concentrating

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