基於三埠式介面可使系統供電更為彈性，具解耦電路之微換流器於獨立型的再生能源供電系統應用中廣受歡迎。而多階層換流器具有不需提高切換頻率即可降低總諧波失真之特點，因此常被使用於高功率的換流器應用。本論文結合三埠式的概念及多階層換流器的技術，提出一具飛馳電容之新型三埠換流器。
本文所提出之新型三埠換流器架構能同時達到高功率應用、三埠的單級轉換介面以及電池充電控制。除此之外，此架構還擁有低開關電壓應力及較少開關數量等優點。最後實作出一組具有400 V直流輸入電壓埠、100 V電池埠及120 V 交流輸出埠之三埠式換流器實驗電路來驗證本文之理論分析。
由實驗結果可得知，於單輸入單輸出供電模式中，濾波前之輸出電壓總諧波失真率小於7%，最大效率達到98.1%。而在雙輸入單輸出供電模式及單輸入雙輸出供電模式中，濾波前之輸出電壓總諧波失真率皆小於11.7%，最大效率分別達到98.1%及98.7%。

The micro-inverters using decoupling circuit are popular for stand-alone renewable system applications recently because the three-port interface makes the system more flexible. In Addition the multi-level inverters are particularly prominent for high power applications because of the low total harmonic distortion performance without increasing the switching frequency. By combining the three-port concept and the multilevel inverter technique, a novel three-port inverter is proposed in this thesis.
The proposed topology can achieve three-port single-stage interface, charging regulator and high-power application simultaneously. Besides, the topology has the advantages of the low switch voltage stress and less component. Finally a prototype of the inverter with an input port for 400 Vdc voltage source, a bidirectional port for 100 V battery, and an AC output port for 120 Vac_rms is implemented to verify the theoretical analysis.
The experimental results show that the voltage total harmonic distortion before filter in SISO mode is lower than 7%. The voltage total harmonic distortion before filter total harmonic distortion in DISO and SIDO modes are lower than 11.7%. The efficiency in SISO is up to 98.1%, and the system efficiency is up to 98.1% and 98.7% in DISO and SIDO modes.

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