本論文主旨在研製應用於微電網多階層隔離型雙向直流-直流系統，主要用於電網端與電池端之間的能量調節。本系統可分成兩個部分，分別為連接電池端的多階層箝位開關三角形電流模式轉換器與連接電網端的多階層半橋式串聯-串聯諧振轉換器。多階層箝位開關三角形電流模式轉換器藉由額外增加的兩組開關與箝位電容以分散各開關電壓應力，使用箝位三角形電流模式控制法可降低輕載時電感有效值電流以提升轉換器效率。此外可藉由電感上產生之逆向電流達到零電壓切換功能，減少開關切換損失。此電路採用數位晶片搭配eCAN模組來達成電網端與電池端之能量控制效果。電網端使用隔離型多階層半橋式串聯-串聯諧振轉換器，透過箝位二極體與箝位電容來提供適當的電流路徑讓功率開關達到零電壓切換效果。因電路一次側與二次側元件對稱，只要搭配適當控制方法即可讓一次側與二次側諧振槽端點電壓形成三步方波以減少開關元件上電壓應力。

The main purpose of this thesis is to develop a multi-level isolated bidirectional DC-DC system for microgrid, which is mainly used for energy regulation between the grid and the battery .The system can be mainly divided into two parts, which are a multi-level CL-TCM converter connected to the battery , and a multi-level half-bridge series resonant converter connected to the grid .The multi-level CL-TCM converter multi-layer architecture on the battery side limits the four switching voltage stress to half the input voltage.In addition, the clamped triangle current control method can not only reduce the current RMS value at light load but also achieve zero voltage switching through the reverse current, which greatly improves the light load efficiency.And this circuit samples the grid end and the battery terminal voltage through the digital chip to achieve the effect of stabilizing the grid and the battery.An isolated third-order half-bridge series-series resonant converter at the grid side provides a suitable current path through the clamped diode and clamp capacitor to allow the power switch to switch to zero voltage.Because the primary side and the secondary side of the circuit are symmetrical, the end point voltage of the primary side and the secondary side resonant tank can reach a three-step square wave with appropriate control methods, so that the component voltage stress can be limited to half of the input or output voltage.

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