本論文主旨為採用主動雙橋式轉換器架構，以研製一固態變壓器。傳統變壓器由於操作於低頻電壓，有體積大、重量重等問題，在應用上會受到許多限制，故需要發展新技術來取代。
本論文實際完成一台輸入電壓為最大300 Vrms、輸出電壓最大為300 Vrms以及輸出功率5 kW，的交流-交流固態變壓器。功率電路主要包含一主動雙橋式轉換器，藉由鎖相迴路提取輸入電壓值做為控制器穩定輸出電壓的參考命令，用以實現匝比為一的變壓器功能，並以數位訊號處理器來實現數位閉迴路控制。經由實驗結果顯示再分別不同電壓輸入情況下，固態變壓器都能有效地穩定輸出電壓等於相對應的輸入電壓，且在不同的負載下效率均在92%以上。

The main purpose of this paper is to develop a solid-state transformer using an active dual-bridge converter architecture. Conventional transformers have many problems due to their operation in low-frequency voltages, such as large size and heavy weight. Therefore, new transformers need to be developed to replace them.
In this paper, an AC-AC solid-state transformer with an input voltage of 300 Vrms maximum, an output voltage of 300 Vrms and an output power of 5 kW is actually completed. The power circuit mainly includes an active double-bridge converter, and the input voltage value is detected by the phase-locked loop as a reference command for the controller to stabilize the output voltage, and the transformer function is realized by the digital signal processor. Realize digital closed loop control. The experimental results show that the solid-state transformer can effectively stabilize the output voltage equal to the corresponding input voltage under different voltage input conditions, and the efficiency is above 92% under different loads.

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