Experimental Research On Photovoltaic Module For Asymmetrical Compound Parabolic Concentrator

Photovoltaic (PV) power generation using solar energy will occupy important position in the future energy framework and social progress. Experimental research of photovoltaic power system with concentrator is significant not only for reducing the cost of solar PV system and motivating extensive application of PV production but also for saving conventional energy resources and protecting ecological environment. In this work, Asymmetrical Compound Parabolic Concentrator (CPC) was designed on the basis of the experiment results of polycrystalline-silicon solar cell output performance. Optimum design of polycrystalline silicon PV module for the asymmetrical CPC was developed, and the output characteristic of the PV module with the asymmetrical CPC was tested and estimated by means of measurement and analysis on the spot.The output performance of the polycrystalline silicon solar cell with back surface field (BSF) structure under different radiation intensity is experimentally investigated. From the experiment results, it was found that the volt-ampere property of the solar cell was improved with the increasing incident radiation intensity while the character of I-V curve tended to be deteriorated if the available intensity increased continuously under low intensity. It is apparent that there was an optimum solar radiation intensity range for the operation of polycrystalline-silicon solar cells. For the BSF polycrystalline-silicon solar cell used in this experiment, the better output power can be achieved under the solar radiation intensity of 1-2.8kw/m~2.Through selection and simulation, we found that the asymmetrical compound parabolic concentrator can work efficiently without tracking devices and merit to balance the quantity of solar radiation received by the receiver all the year if its effective concentration ratio is fewer than 3. The asymmetrical CPC concentrator was worked out applied to BSF polycrystalline-silicon photovoltaic cell by theoretical calculation, structure optimization and performance simulation.The structure of photovoltaic module for the use of fixed asymmetrical CPC concentrator was investigated and designed, and based on the structure the polycrystalline-silicon photovoltaic module was fabricated for recharging general 12V batteries. For the combination of the module and asymmetrical CPC concentrator, its effective concentration ratio reaches 2.46 and the output power of the system increased by 2.13 times approximately.