本論文主旨在設計及製作兩級式太陽能發電系統，系統前級以三階層升壓式轉換器構成而後級以三階層T型態變流器構成。前級三階層升壓式轉換器配合擾動觀察法進行最大功率點追蹤，可使太陽能發電系統在變化的環境下有最佳功率輸出，而後級三階層T型態變流器主要是作為市電併網之電路，其控制策略則是使用空間向量脈波寬度調變法提升直流電壓鏈的利用率，市電同步策略則是採用數位式鎖相迴路法。太陽能發電系統採用德州儀器出產的數位信號處理器(TMS320F28069)為數位控制器，本論文建立1.2kW系統，透過實作及量測來驗證提出之架構的可行性，並且針對兩級式太陽能發電系統之低壓穿越提出新的控制策略，並且模擬驗證其可行性。

The photovoltaic (PV) generation system investigated in this paper is a two-stage topology consists of a DC/DC three-level boost converter and a grid-connected three-level T-type inverter. The DC/DC three-level boost converter apply perturb-and-observe algorithm for the maximum power point tracking which makes the PV generation system delivers maximum output power to the grid in varied environment. The three-phase three-level T-type inverter is proposed to reduce the output voltage harmonics, and it is mainly as the utility grid connective circuit. This three-phase three-level T-type inverter uses the space vector pulse width modulation (SVPWM) as the control strategy to increase the usage of the DC-link voltage. Moreover, the strategy of the synchronization with the utility grid is applied the digital phase lock loop (DPLL). Finally, this thesis established a 1.2kW prototype with using the digital signal processor (DSP TMS320F28069) as the digital controller. Both simulation and experimental results demonstrate the validity of the proposed photovoltaic generation system.

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