應用於太陽能供電系統之新型高效率隔離型三端雙向DC/DC轉換器

• Main Authors: Pin-Nan Chiu, 邱屏南
• Other Authors: Yu-En Wu
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/40011231492461577035

碩士 === 國立高雄第一科技大學 === 電子工程研究所 === 104 === This paper proposed a novel high efficiency isolated three-port bidirectional DC/DC Converter for Photovoltaic Systems. The proposed isolated converter contains a high step-up converter from PV modules to DC bus and a bidirectional charge and discharge control circuit for battery to institute into an improved Boost-Flyback converter. When the energy supplied from the PV modules is sufficient, it can step-up the output of PV modules and provide energy to the DC bus while charging the battery at the same time. However, the DC bus voltage is provided by the battery while lack of energy supply from the PV modules. When the proposed converter is operated at the step-down mode, the DC-blocking capacitor in the high-voltage side is used to reduce the voltage on the transformer and achieve a high step-down performance. Moreover, the energy stored in the leakage inductance is recycled to the DC-blocking capacitor during the step-up mode to improve the system’s overall efficiency. Finally, a 500W three-port bidirectional converter was implemented to verify the feasibility and practicability. The maximum efficiency of the proposed converter operated under high step-up mode for the PV modules is 95.2%, while battery step-up mode is 94.2% and step-down mode is 97.6%