Study and Design of a Digitized High Step-up Voltage Ratio Maximum Power Point Tracking Converter for Photovoltaic Systems

• Main Authors: Chang-wei Su, 蘇昶瑋
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/fpnxfh

碩士 === 國立臺灣科技大學 === 電子工程系 === 99 === The rapid advances in solar cell technology have enabled the significant developments in photovoltaic power system. The solar power has the advantage of clean electricity generation. However, the solar panels present wide range of voltage variations under different solar irradiation, load and temperature conditions. A maximum power point tracking (MPPT) control is usually applied to extract maximum power from the photovoltaic system. Efficiency performance of series-connected solar panels is seriously deteriorated by an individual that has worse efficiency characteristics. The PV panels often work in mismatching conditions due to different panel orientations and shadowing effects. This thesis studied a module-integrated converter with P&O MPPT function. A high step-up voltage ratio DC/DC converter was designed to release the maximum power of each PV panel and provide a high voltage DC bus for the post-stage DC/AC inverter. A DSP chip TI TMS320X2808 was adopted to realize the digital controller. An Agilent E4360 solar simulator was used as the power source in experiments. The experimental results for a laboratory prototype were implemented and tested to verify the feasibility of the studied MPPT prototype module.