Sun Tracking for Photovoltaic Systems

• Main Authors: Ho Hsiao-Chung, 何贒中
• Other Authors: Chen Po-Hung
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/82836994666159668935

碩士 === 聖約翰科技大學 === 電機工程系碩士班 === 98 === The main approaches to enhance the generating efficiency of photovoltaic systems including static maximum power point tracking (MPPT) techniques and dynamic sun tracking techniques. The purpose of this thesis is to design and implement an active sun tracking technique for photovoltaic systems. The proposed technique uses a microprocessor cooperating with a clock chip and a look-up table to adjust photovoltaic arrays always becoming perpendicular to sunlight in order to obtain the maximum power output from photovoltaic arrays. The system adopts an Atmel AT89S52 microprocessor as the control core and a DS12887A clock chip providing real time numeric. The hardware circuits cooperate with the software calculation to drive a stepper motor rotating photovoltaic arrays to become perpendicular to sunlight. The electric energy output from photovoltaic arrays utilizes a step-down DC converter to store in a battery and supply to the load. Finally, a practical sun tracking system is accomplished to test and verify the proposed technique enhancing the generating efficiency of photovoltaic systems.