Dense Matrix Concentrating Photovoltaic Modul Hrat Dissipation Technology Research

Concentrating photovoltaic(CPV), which is generally considered to be the new generation of photovoltaic technology, has many advantages such as high conversion efficiency, limited area occupation, low energy consumption in production. It has been a major direction in energy development. However, this technology still has some disadvantages, like big heat sink, heavy module and poor adaptability in outdoor running, which limits the applications. To solve these problems, this thesis focuses on the research and optimization of heat dissipation construction of the CPV module. New distributed heat dissipation construction based on dense array Fresnel lenses is developed. Secondaly optics is proposed in this thesis to improve the environmental suitability of CPV module.In order to improve the heat dissipation efficiency and cut the module cost, this thesis proposed a distributed heat source design, in which the large size Triple-junction GaAs cell used in traditional CPV module is cutted in to dozens. Based on the design above, flat-plate dissipation structure and built-in fin type dissipation structure are proposed. By using ANSYS software, the two heat dissipation structures are optimized and their detailed parameters are given. CPV modules are fabricated according to the design above and tested. At standard outdoor conditions, the base plate temperature of flat-plate type module is 47℃, and the built-in fin type has a base plate temperature of 42℃. The experimental results fit the software simulation very well, showing that the designed heat dissipation structures can sustain a long working life of the CPV solar cell.To make the CPV modules work stablely under large temperature range, two types of secondary optics are designed and equipped in CPV modules.The results showed that the module with secondary glass lens can work in the environment of-40~50℃ and efficiency attenuation less than 10%, the module without the second glass lens efficiency attenuation more than 40% at low temperatures.The influences of key factors such as wind velocity and DNI have on module temperature are quantitatively studied through software simulation and spot test.Shown by the software simulation, solar cell temperature will rise 3℃ when DNI increases by 100W/m2. When wind speed is below 5m/s, the cell temperature will decrease 3℃ every time when wind speed increases by 1m/s. This result can provide reference for the module performance prediction and the selection of module application area.By spot test, it is proven that the designd dissaption can work properly. The test temperature is quite similar with the simulation result and can ensure a long life cycle for the CPV module. The dissipation design and secondary optics presented in this thesis suit for large scale automatic production and can reduce module cost effectively.