Investigation of the Stability Improvement in Power Generation of High Concentration Photovoltaic System with Super-capacitors

• Main Authors: Tsai, Peng - Fei, 蔡鵬飛
• Other Authors: 黃裕培
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/98107882221542858583

碩士 === 國立金門大學 === 電子工程學系碩士班 === 101 === The Super-capacitor component is proposed to be integrated into HCPV system. The proposed architecture is expected to improve the unstable power generation phenomenon caused by vibration of HCPV’s solar tracking system. The vibration is usually caused by wind or unstable sensor, which is interfered by cloud and noise. If regulator circuit or components can be integrated into HCPV system to regulate the voltage of photovoltaic receivers’ output, it will improve HCPV system’s stability and power generation. In the Chap two of this thesis, we construct the Tomas’s equivalent circuit of solar cell with super-capacitor which was published in R.M. Nelms’s research paper. The improvement of circuit’s stability with super-capacitor is evaluated by PSpice simulation. The simulation is divided into three segments: the first one is output stability improvement evaluation; the second one is super-capacitor evaluation; and the third one evaluates the tracking angle deviation. The power generation will decrease around 48%. The power generation loss will be improved to 5.4% by adding 5F super-capacitor in the circuit. In addition, the simulation result demonstrates that different value of super-capacitors will cause different stability duration. Therefore, we can choose suitable value for the different conditions. In the Chap three of this thesis, experiments are carried out to evaluate the simulation results of Chap two. The experiments are divided into two segments: with and without output loading of the solar cell circuit. The output voltage of θ=3° is still within the spec of accept angle (remains 90% output power). The output voltage decreases a little compared to the output voltage of solar cell circuit without resistance loading. Therefore, it is concluded that by adding 5F super-capacitor to the circuit with or without resistance loading, the output voltage could sustain more than 89.8% with deviation angle θ=2°. This research analyzes and simulates the effect of integrating super-capacitor circuit to HCPV system. The circuit model and simulation parameters of the proposed system are built and investigated. The efficiency and stability of HCPV system’s power generation could be improved by implementation of the proposed model of this research. In addition, the process of integrating super-capacitor to HCPV system can be developed via this project. Moreover, this project proposes a novel application of the super-capacitor with photovoltaic system.