本論文主旨為設計及製作雙向三階直流-直流轉換器，由三階層升壓轉換器及三階層降壓轉換器所組成，其輸入端並聯電池，輸出端並聯負載及直流電源，並藉由控制功率開關，決定系統操作於電池放電至負載亦或電源放電至電池。因此，本架構適合使用於電池儲能裝置（如車載電池）與直流電源（如直流微電網）間，當直流微電網處於用電尖峰時，電池可供電至負載以降低直流微電網負擔；反之，離峰時段則可對電池充電。
本架構因其架構特性，輸入電壓及輸出電壓範圍可重疊，且三階層架構具降低電感電流漣波、低功率開關電壓應力等優點，故系統使用三階層架構。論文將比較傳統型轉換器與三階層架構之差異、介紹雙向三階直流-直流轉換器，並推導其電路之小訊號模型、轉移函數，最後建立一電池電壓為210 V至290 V，直流鏈電壓為600 V，直流電源為380 V之系統，本系統使用數位訊號處理器(TMS320F28069)作為數位控制核心，以模擬與實測結果驗證所提出架構之可行性。

This thesis proposes a bidirectional three-level dc-dc converter, which consists of two three-level converters. The input parallel with battery and the output parallel with load and DC voltage power supply. By controlling the power switches, it could decide the system is operating on charge mode or discharge mode. Thus, the converter is suitable for using between the energy storage devices (such as the electric vehicle battery) and the DC voltage source (such as the DC micro-grid), the battery release the energy to grid during peak load hours and recharged until off-peak hours.
The proposed converter allows an overlapping range of the input voltage and the output voltage, the three-level topology has advantages of small inductor current ripples, small cross-voltage of switch and low power loss, which is better than traditional topology. This thesis will analyses the difference between the traditional converter and the three-level converter, introduces the proposed bidirectional three-level dc-dc converter and uses the analysis result of the system to get the small-signal modeling and transfer functions. At last, this thesis establishes a prototype which the batteries voltage varies from 210 V to 290 V, the dc link voltage is regulated at 600 V and the DC voltage power supply is 380 V. The system adopts the digital signal processor (DSPTMS320F28069) as the digital controller. Both simulation and experiment result demonstrate the validity of the proposed converter.

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