本論文旨在開發一雙向變頻器，並從事微電網與傳統電網間之操控研究。應用適當之控制，所提之變頻器系統具有高彈性及高性能之雙向電力潮流控制能力。藉由所發展之相鎖迴路同步程序，直流微電網可經由所建變頻器平順地接至傳統電網。連網後，變頻器具有三種電力操控模式：(i)放電模式：由微電網提供所有區域負載之實功和虛功。此外，亦可規劃回送功率至傳統電網；(ii)充電模式：傳統電網供能至直流微電網與區域性負載。特定言之，可由傳統電網對微電網中之蓄電池組充電；(iii)浮充模式：所有區域性負載均由傳統電網供能。當傳統電網發生故障時，同步開關斷開將微電網隔離，變頻器系統操作在變頻器模式，由直流微電網提供負載不間斷之電源。综言之，所提之變頻器具電力調節器、主動電力濾波器及不斷電電源供應器之複合功能。
此外，微電網亦可由一所開發之可插式交流/直流轉換器支援能量，其由一個三相單開關切換式整流器及一共振式直流/直流隔離轉換器所組成，而其交流輸入源可由備用配電迴路、風力發電機、微型渦輪機、飛輪發電機及混合電動車中之發電機等提供。所建構系統中所有功率級之控制均以數位信號處理器實現，並以一些模擬與實測結果顯示所建系統之操作性能。

This thesis presents the development of a bidirectional inverter and operation control between DC micro-grid and utility grid. Through proper control for the developed inverter system, it possesses flexible and high-performance bidirectional power flow control capability. The DC micro-grid is connected to the utility grid via the inverter by the developed phase-locked-loop (PLL) synchronization process. The grid connected power conditioning control operation can be divided into three modes: (i) Discharging mode: all the local load real and reactive powers are supplied from the micro-grid. Moreover, the programmed powers can also be sent back to the utility grid; (ii) Charging mode: the utility grid supplies power to the DC micro-grid and local loads. In particular, the battery bank in micro-grid is charged from the mains; (iii) Floating mode: all the local loads are powered from the utility grid. When the utility grid failure occurs, the synchronization switch is opened to isolate the micro-grid. The inverter system is operated in inverter mode. The inverter system supply uninterruptible power from DC micro-grid to the load. The proposed inverter system possesses the combined functions of power conditioner, active power filter and uninterruptible power supply (UPS).
In addition, the DC micro-grid can also be supported energy from a plug-in AC/DC converter system. It consists of a three-phase single-switch (3P1SW) switch-mode rectifier(SMR) and a LLC resonant DC/DC isolated converter. The AC input source may be provided from backup distribution network, wind generator, micro-turbine, fly-wheel generator, and hybrid-electric vehicle generator, etc. The controls of all constituted power stages are realized digitally using digital signal processor (DSP). Some simulated and experimental results are provided to verify the operating performance of the established system.

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I. Switch-Mode Rectifiers
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J. High Frequency Isolated DC-Link
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