Prediction method for temperature characteristics of concentrating photovoltaic module introducing tunnel junction mechanism

Abstract

The invention discloses a prediction method for temperature characteristics of a concentrating photovoltaic module introducing a tunnel junction mechanism. According to the method, a 3D distribution circuit tunnel junction model is simplified into a two-dimensional lumped model, that is, tunnel junctions are equivalent to circuit elements; and taking a concentrating triple-junction cell double-diode model as an example, the tunnel junction equivalent model is used to replace an equivalent series resistor, the concentrating triple-junction cell double-diode model and the equivalent tunnel junctions are utilized to establish an explicit circuit relation under a low-power concentrating condition, initial values of all parameters are determined, several groups of parameter values are extractedthrough mathematic iterative fitting, the parameter values are compared with an experiment measured result to obtain an optimal parameter set, so that fitting convergence of an I-V characteristic curve of the module is better, and then the I-V characteristic curve of the module under a high-power concentrating condition is reasonably estimated. Therefore, the method is beneficial for people to better understand the working mechanism of the tunnel junctions, optimization efficiency of an MJSC is improved, and meanwhile design and optimization cost of the MJSC is lowered.

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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