| Summary: | 碩士 === 國立中正大學 === 電機工程研究所 === 99 === This study is to design a maximum power point tracker (MPPT) with Buck/Boost operation mode. The basic structure is formed with Buck and Boost converters. When input voltage is higher than output voltage, the MPPT operates in buck mode; otherwise, it operates in boost mode. When input voltage changes between high voltage and low voltage, the mechanism of changing reference input voltage is adopted to switch the operation mode. This tracker controller uses microcontroller TMS320LF2406A, and the control algorithm is based on the perturb and observe method. In addition, the PV input voltage is controlled for achieving maximum power point tracking. This study adds an insulation check function to detect the resistance between PV panel frame and ground. It can improve the safety of the MPPT. A 2.5 kW MPPT has been implemented, and the highest conversion efficiency can reach 99%.
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