High Concentration Reflected Photovoltaic System Design and Manufacturing

• Main Authors: HSU,CHENG-YI, 許政義
• Other Authors: LIN,YULI
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/60555438814091383997

博士 === 中華大學 === 工程科學博士學位學程 === 105 === In the study, we initially used the trace pro software for simulating the optimal condition of single module of the model A and model B of 3x3 array module of high concentration reflected photovoltaic (HCRPV) module, with maximum efficiency condensing structure, with a solar cell (size 5.5 mm x 5.5 mm). The main parameters include the focal length and radius of curvature of the first and secondary mirror. After simulation, the optimal conditions were then used to build in model of SolidWork software and fabricated the HCRPV model. The aluminum HCPRV model was manufactured by stamping machine to reduce the manufacturing cost. The HCPRV model was then coated with silver material on the first and second reflecting mirror. After the designed structure was fabricated, the HCRPV module was then installed on a smaller solar tracking system and tested. Then, according to the best condition design of the single module of model A, a 3x3 array module consisting of nine sets of 10cmx10cm single module structure was designed. In this study, HCRPV was designed such that the light direction after deflected from second reflecting mirror should fall into the solar cell (5.5 mm x 5.5 mm) without the light guide tube. In simulation of 3x3 array structures, the focal length and radius of curvature of the first and secondary mirror were the main parameters to be optimized. After simulation, the optimal conditions were then used to fabricate the HCRPV model. To fabricate massive HCRPV solar cell unit, cost is the key to be considered. In this work, stamping method is utilized to manufacture the designed HCRPV unit. The material used is Aluminum metal. The HCRPV mirror structure after mold was coated with silver material. In this system, we used for four solar cells as sensors which are the solar cell numbers#2, #4, #6 and #8. When the position is correct, the programmable logic controller IC can read all the output data of 3x3 array solar cells. The program has been set real time or intervals of 1 minute or 10 minutes to check and compares four kinds of output power. If sensors have different output power, the program will be auto operated again. From the results of this study, it is known that a single model A structure (diameter 300 mm mirror) and model B structure (diameter 100 mm mirror) are compared. Although the model B mirror area is 9 times smaller than the model A, but the output power is only 4.5 times the difference, indicating that the model B structure has a higher light collection efficiency, and the model B mirror is manufactured by the stamping processing, and model A mirror is manufactured by the CNC processing, therefore the model B is manufactured easy and simple. According to the structure of Model B, we can make nine sets of 3x3 array with the highest concentrating efficiency. We mainly discuss the resulting condenser efficiency and output power and the function of sensing the sun's position. Therefore, we design nine sets of model C structure (diameter 100 mm mirror), the current use of power 3W solar cells. From the measurement results of model C structure, the power can be calculated to be 0.52 W ~ 0.53 W, which is about 17% of the power of solar cell (3 W) used. The existing design focus area is only concentrated in the circular area, while the solar cell area for the square (5.5 mm x 5.5 mm), resulting in solar cell area of about 27.3% of the area cannot be light of the loss of luminous efficiency, so the model C structure, the theoretical condenser efficiency was 96.9% * 72.7% = 70.4%. In order to solve the above problem, in the design of the module to increase the use of "light guide tube" design, mainly to the incident sunlight can be uniformly irradiated on the III-V solar cells, solar cells to increase the effective area of the full use of, and improve the condense efficiency, so the design model D structure (diameter 100 mm mirror) with light guide tube structure. From the measurement results of model D structure, the power can be calculated to be 0.66 W ~ 0.67 W, so the model D structure has a higher 26% output power than model C structure, but which is about 22% of the power of solar cell (3 W) used, therefore the model D structure cannot produce higher output power. In order to solve the above problem, mainly in the design of the module will increase the use of "increase the existing mirror area" approach, mainly to increase the energy of incoming sunlight and improve the condenser efficiency, so the design model E (diameter 100 mm mirror) with the light guide tube structure. From the measurement results of model E structure, the power can be calculated to be 2.68 W, which is about 89.3% of the power of solar cell (3 W) used, the main model E mirror area has bigger 4.5 times than the model B, so it can be improved the condenser efficiency. According to the structure of Model E, we can make nine sets of 3x3 array with the highest concentrating efficiency. We mainly discuss the resulting condenser efficiency and output power and the function of sensing the sun's position. Therefore, we designed nine sets of models F structure (diameter 100 mm mirror) using raw materials (aluminum alloy) and model G structure (diameter 100mm mirror) using new materials (acrylic), the current use of power 3W solar cells. From the measurement results of model F structure, the power can be calculated to be 2.62 W ~ 2.74 W, which is about 90% of the power of solar cell (3 W) used. From the measurement results of model G structure, the power can be calculated to be 2.59 W ~ 2.74 W, which is about 89.2% of the power of solar cell (3 W) used. So the optimal design of high concentration reflected photovoltaic array module of model F structure which is the best structure.