本文提出疊接架構於燃料電池混合供電系統之應用，由於燃料電池無法提供瞬間能量轉換，所以利用電池串接放電改善燃料電池動態特性。電源疊接式結構透過非隔離式電力轉換器傳遞少部份能量，大部份能量直接傳送至輸出負載，以電壓補償之概念來提升系統之效率。在燃料電池的應用中，可由疊接架構之特性來補償燃料電池的極化損失，藉此調整燃料電池系統輸出電壓。疊接式混合電力轉換器之整體效率可高達92.65%，系統規格500 W。為了達到高電壓之輸出，延伸此高效率之雙向疊接式電力轉換器架構，以多層疊接之概念，提出三電源疊接混合供電系統。另外，提出雙迴路主動燃料電池電壓控制策略，來控制此三電源疊接系統，以達高效率的電能管理。

This thesis develops the cascoded configuration for fuel cell (FC) applications. Using the concepts of voltage compensation and voltage allocation, the performance and efficiency of an FC conversion system can be improved. Most energy is provided by FC directly. Part of energy of FC is to build the voltage of ultra-capacitor modules (UCM) and battery. When transition is happened, battery keeps voltage of UCM .Thus, FC polarization loss is decreased, so the efficiency is high. The overall efficiency of the proposed hybrid power system can achieve 92.65% and 500 W at full load. For high-voltage applications, a three-source cascoded system is presented by extending the high-efficiency cascoded bidirectional configuration and using the multi-level cascoded concept in this dissertation. Moreover, a two-loop active FC voltage control for the proposed system is presented to achieve highly efficient power management.

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