Highly Efficient Analog Maximum Power Point Tracking (AMPPT) in a Photovoltaic System

• Main Authors: Yang, Chih-Yu, 楊智宇
• Other Authors: Chen, Ke-Horng
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/t366bg

碩士 === 國立交通大學 === 電控工程研究所 === 100 === A compact-size analog maximum power point tracking (AMPPT) technique is proposed in this thesis for high power efficiency in the photovoltaic (PV) system. Several MPPT techniques are studied at first to compare their pros and cons. The characteristics of solar array are introduced as well to address the difficulties when utilizing the solar energy. Combining the existing MPPT approaches, the thesis presents a fast and accurate tracking performance. The shading effect, which undermines the efficiency of solar array, is also discussed. The proposed MPPT technique can be further improved by global maximum power tracking (GMPPT) algorithm to guarantee its robustness. Here, a wide-range current multiplier, which tracks the maximum power point (MPP) in the solar power system, is implemented to detect the power slope condition of solar array. Simulation and experiment results show that the proposed MPPT technique can rapidly track the MPP with a high tracking efficiency of 97.3%. Furthermore, the proposed system can connect to the grid-connected inverter to supply AC power.