本論文是研究三主動全橋式轉換器，應用於不斷電系統的雙向儲能裝置。當三主動全橋式轉換器操作於一個切換週期中，會有一部分的功率傳遞至輸出負載，另外一部分的功率則會傳遞回一次側，產生能量的損失，此損失定義為三主動全橋式轉換器的虛功率。為了提高轉換器的效率，本論文設計三主動全橋式轉換器操作於最小的有效值電流，減少開關元件與磁性元件的導通損失，達成減少三主動全橋式轉換器的虛功率的效果。在論文中，將先推導三主動全橋式轉換器的Y、Δ等效電路，並且利用轉換器的Δ等效電路推導出功率傳遞方程式。根據二、三次側的相位角超前或者落後一次側，取得三主動全橋式轉換器的6種功率傳遞方向。之後再利用所推導的功率傳遞方程式以及電流有效值方程式，設計轉換器中三個電路參數，最大相移角φmax、變壓器匝數比n以及串聯電感Leq，並且製作出實體電路進行測試。
此轉換器參考市售的不斷電系統規格，實際完成一台輸入電壓170 ~280 V、兩組輸出電壓360 V以及輸出功率可達到10 kW的三主動全橋式轉換器。並以單相移控制的方式，控制轉換器功率的傳遞。實作部分利用數位訊號處理器進行控制，取三組輸入電壓170 V、220 V、280 V進行電路測試，在不同的負載條件下，兩組輸出電壓皆可以達到360 V，於半載時效率可以達到90%以上。

The thesis is to study the triple active bridge converter, which is applied to the bidirectional energy storage device of the uninterruptible power system. The triple active bridge converter operates in one switching cycle, a part of power will be transferred to the load, and the other part of power will be transferred back to the primary side, resulting in energy loss, which is defined as the reactive power of the triple active bridge converter. In order to increase the converter efficiency, the triple active bridge converter designs with the minimum RMS current to reduce the conduction loss of the switching component and the magnetic component. Achieve the effect of reducing the reactive power of the triple active bridge converter. In the thesis, first, the Y and Δ equivalent circuit diagram of the triple active bridge converter will be derived, and using the Δ equivalent circuit diagram derived the deliver power equation. According to the phase shift angles of secondary side and third side lead or lag the primary side, the six power deliver directions of the triple active bridge converter can be obtained. Then, using the deliver power equation and the current RMS equation design the converter parameters, such as maximum phase shift angle φmax, transformer turns ratio n and inductor Leq. Finally, making actual circuit test the converter.
The converter refers to the specifications of uninterruptible power system, and actually completes a triple active bridge converter with an input voltage of 170~280 V, two output voltages of 360 V and output power of 10 kW. Using the single phase shift control method to control the power delivery of the triple active bridge converter. The implementation uses a digital signal processor to control. Three input voltages of 170 V, 220 V, and 280 V are used to test the circuit. Under different load condition, the two output voltages can reach 360 V, and the efficiency can reach more than 90% at 50% load.

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