Performance analysis of photovoltaic system by simulation and outdoor measurement in Jhongli and Pingtung

• Main Authors: Yu-chieh Hao, 郝宇杰
• Other Authors: 吳俊諆
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/89432985164459371448

碩士 === 國立中央大學 === 能源工程研究所 === 102 === This study analyzed the performance of photovoltaic (PV) and concentrator photovoltaic (CPV) systems with three sun-tracking methods (sun sensor, sun-trajectory calculation and hybrid) in Jhungli and Pingtung. Prediction of electricity with the software PVsyst was compared with almost one-year outdoor measurements. Comparison between two tracking approaches (sun-trajectory calculation and light sensor) on the two-axis PV system for ten months showed that the electricity generation of the former approach was 2.1% higher than the latter approach. This indicated the sun-trajectory calculation is a practical and effective sun-tracking method. A 6-month assessment of the two-axis CPV systems with two sun-tracking methods (hybrid and light sensor) illustrated that the electricity generation of the hybrid tracking was 11.7% higher than the tracking with light sensor. However, the former approach is still calibrating its parameters, and its sun-tracking is unsatisfactory which affect the electricity output. It is expected that the hybrid-tracking approach will continuous improving and the electricity generation can increase. Field measurement of the two-axis PV system using the sun-trajectory calculation and the fixed PV system was compared for eight months. The result showed that the electricity output of the tracking PV was 9.9% higher than that of the fixed one. This implied sun-tracking can effectively enhance electricity generation. Several parameters that correlated with power output were also investigated. The irradiance was the most important parameter which correlated linearly with power generation. The module temperature and ambient temperature were in negative correlation with power output. Both temperatures increase will reduce the power output.