本論文主旨在研製微電網高功率隔離型雙向直流-直流系統，主要用於微電網中直流匯流排與電池模組間充放電的系統，每組串級電路可分為兩部份。匯流排端的三相串聯諧振轉換器以開迴路控制做隔離級使用，電池端的交錯式升/降壓轉換器以數位控制晶片來達成閉迴路控制，藉由擷取電池端和匯流排端的電壓及電流訊號來進行適當的電路行為模式和達成均流控制。電池端是以兩組半橋組成升/降壓型電源轉換器，其中功率開關信號相差180度交錯切換可以減少降壓模式下的輸出電流漣波。匯流排端是以三臂六開關的全橋轉換器，具有三組變壓器和三組諧振槽，三組變壓器都使用Y-Y接法，每臂控制信號相位各差120度，皆操作於串聯諧振區間。並以兩組串級電路並聯接於直流匯流排正端點至中點，另外兩組則並聯接於匯流排中點至接地端點。

The aim of this thesis is to study and implement a micro-grid isolated high-power bi-directional DC-DC system. It is mainly used in the system of charging and discharging between the DC bus and the battery module in the microgrid. Every unit of the series circuit consist of two stages. The three-phase series resonant circuit converter at the bus side is used as an isolation stage for open-loop control, and the interleaved Buck/Boost converter of the battery side depend on digital chip to achieve closed-loop control. The appropriate circuit mode and current sharing control are achieved by sensing the voltage and current signal of the battery side and bus side. The stage of the battery side consists of two buck/boost converters with interleaved control, which decrease the output current ripple. The stage of DC bus side is a Three-Phase full bridge circuit, there are three isolated transformers and three resonant tanks. The control signal of each phase is offset from the others’ by 120°, which operated as a series resonant region. In order to raise the overall power, parallel two units between the positive point and midpoint of DC bus, the other two units between the midpoint and ground point of DC bus.

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