本文旨在設計及製作太陽能電池發電系統市電併聯轉換器。系統架構可分為前級轉換器與後級變流器兩部分，系統架構之輸入源為太陽能電池，利用前級轉換器進行太陽能電池之最大功率追蹤，並透過後級變流器將直流電源轉換為交流電源且將此電能饋入市電，系統利用變流器之功因修正，以獲得接近單位功因之輸出。
前級平衡電容式升壓轉換器具傳統其他升壓式轉換器兩倍之升壓效果，並於電路上加入零電壓切換技術，不僅可降低功率開關於導通區間之切換損失，同時也使功率二極體達到零電流截止之效用，藉以提升整體系統之效率。後級五階變流器輸出電壓準位乃由輸入直流電壓準位經功率開關切換而得，故一旦輸入端電壓準位不平衡時，將使輸出電壓準位失真。為改善此一缺點，本論文利用所提出之平衡電容式升壓轉換器本身自我平衡之輸出特性，平衡後級變流器之輸入電壓，使變流器可以利用其開關切換控制，輸出一平衡五階之電位，使系統輸出獲得較佳之電壓與電流諧波因數。
為驗證所提系統有效性，本文於系統輸出功率600W額定下，分別進行獨立負載與市電併聯進行模擬與實作測試。於獨立負載中，五階全橋變流器輸出電壓總諧波失真率分別為2.67%，系統整體效率為87.2%。市電併聯運轉模式下，系統輸出功率因數為99.2%，因市電電壓諧波量高致本文系統之電流諧波因數達5.7%，系統整體效率為85.3%。

The thesis focuses on design and implementation of a solar photovoltaic (PV) generation system. The system architecture is divided into a front-end boost converter and a back-end multilevel inverter. With source of PV modules, the front-end converter conducts maximal power point tracking (MPPT) control, as the back-end inverter feeds the DC power into the grid. Meanwhile, power factor correction (PFC) of the inverter output is employed to obtain near-unity power factor.
The front-end converter not only possesses the voltage doubling function as compared to the traditional Boost converter, but uses zero-voltage switching techniques to reduce the switching losses of main switch and turn off the diode at zero current. The overall system efficiency can thus be enhanced. In the proposed system, the output voltage of the back-end five-level inverter is obtained by switching the output voltages of the front-end converter. Once the output voltages of the front-end converter are not balanced, the five-level output voltage would be distorted. To avoid the disadvantages thus incurred, a self-balanced capacitive Boost converter is proposed to balance the voltages for the inverter input. Less harmonic contents in the inverter output can therefore be achieved.
To verify the effectiveness of the proposed system, with power rating of 600W, the system is practically tested for off-grid and on-grid operations. In the testing of off-grid operation, the total harmonic distortion (THD) of the proposed five-level full-bridge inverter output voltage is 2.67%, and the overall efficiency of the system is 87.2%. In the testing of on-grid operation, the power factor of the system output is 99.2%, and the THD is 5.7% due to higher THD of the grid voltage with the overall efficiency of 85.3%.

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