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Investigation of the Performance of a Low Concentration Photovoltaic Power System

Author: XuZhangLu
Tutor: ZhuHua
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: concentrator photovoltaic systems cooling systems voltage-controlled method
CLC: TK514
Type: Master's thesis
Year: 2011
Downloads: 194
Quote: 0
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Abstract


Solar photovoltaic power generation system has been paid attention for its safety, reliability, no noise, no pollution, no geographical restrictions and so on. Present study shows that: concentrating photovoltaic power generation system can improve power generation efficiency and reduce electricity costs. In this paper, the existence of the concentrating photovoltaic power generation system of photovoltaic panels and batteries causing the system temperature and lower efficiency and shorter battery life and other issues, the pressure-control method is applied to concentrating photovoltaic power generation system for testing the performance of charging And a cooling system model was established and simulation analysis has been carried out, according to concentrating photovoltaic systems.In the paper, charging characteristics of photovoltaic driven battery was experimentally investigated, using pressure-controlled method. The changing characteristics of the solar radiation, charging current, charging voltage and charging intensity during the process have been studied. The results showed that pressure-control method can effectively control PV charging of VRLA battery and solve its thermal failure. It is avoided that VRLA battery get damaged or exploded for excess oxygen accumulated, through controlling the inner pressure of VRLA battery in a safe pressure range by pressure-controller. Over charge of battery is prevented and battery life-span is prolonged, through change of inner pressure to control charging current and voltage. Volt-ampere characteristics of battery are keeping well with that of PV cells, and solar PV cells are made best use, through tracking of maximum power point.Based on the experiment, simulation analysis of the cooling system in concentrating photovoltaic power generation system was also researched in the paper. Through comparison, water-cooling system with better cooling efficiency was selected to establish a analysis model of water cooling system, and Fluent was applied in the simulation. The efficiency of the cooling system has been studied under different intensity of solar radiation, different cooling water inlet temperature and different cooling water mass flow conditions. Simulation results can be in good agreement with the experimental results. The results of this study can be a useful reference for the design and improvement of real concentrating photovoltaic power generation system.

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CLC: > Industrial Technology > Energy and Power Engineering > Special heat and its mechanical > Solar Energy Technology > Solar power installations
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