本論文主旨為研究太陽能光電系統與市電經功率因數修正器之直流電壓並聯，基於原有的市電與太陽能電池直流並聯供電系統中，在最大功率追蹤器後端仍需串聯一級DC/DC轉換器，才可與直流市電並聯，由於多串聯一級轉換器即會造成多一級的損失，不符合現今高效率、低損耗的要求，所以本論文將以原有的市電與太陽能電池直流並聯供電統為基礎， 進一步探討市電與太陽能電池單級直流並聯供電之條件 。
在市電與太陽能電池單級直流並聯系統中，太陽能最大功率追蹤器與功率因數修正器將延續原有兩級直流並聯系統中的架構與控制模式，只改變太陽能電池模組的輸出端電壓，以及測試與常用直流市電電壓並聯，進而歸納整理出單級直流並聯之相關條件。最後經實驗證明單級直流並聯系統，除了可與直流市電並聯之外，同時並可將太陽能之最大功率輸出至負載，達到高效率節能的目的。

This thesis focuses on the research study of a DC power system fed by utility with a power factor corrector (PFC) and a photovoltaic (PV) system parallel-connected at DC side. In conventional system, an additional DC/DC converter is required following the maximum power point tracking (MPPT) circuit in order to be parallel-connected with the PFC. This additional stage will increase the system power loss, thus cause this approach improper for high efficiency and low power loss requirements. Therefore, this thesis will, based on the basic methodology of the existing one, propose and study a single-stage DC power supply system by paralleling the utility-PFC and the PV system at DC side.
The topology and control method for MPPT and PFC are discussed. The output port of the PV system is connected to the output of the PFC at different voltage levels. Then, the operating conditions for the presented single-stage DC power supply system are deduced and analyzed. Experimental results show the feasibility of the proposed single-stage topology, which can effectively transfer the tracked maximum power from the PV system to the load.

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