太陽能發電系統所接收到的太陽照度時時刻刻都在改變，使得最大功率追蹤系統會因為照度快速變化而有錯誤追蹤的情形發生，錯誤追蹤連帶會造成功率上的損失，因此開發一適用於快速照度變化環境下之太陽能最大功率追蹤系統是相當重要。本文針對擾動觀察法於照度變化下的追蹤情形進行詳盡的追蹤過程分析，並整理出會發生錯誤追蹤的情況，針對這些錯誤追蹤情況，本文藉由增加太陽能電池電流變化進行判別以及短路電流進行判別的改善技術，改善其照度變化下錯誤追蹤情形，使追蹤系統能往正確的追蹤方向進行追蹤。
為了驗證本文所提之改善技術的可行性，首先對所提的改善技術進行模擬分析，將擾動觀察法加入本文所提之改善技術做比較，藉由追蹤過程可看出本文所提之改善技術可使追蹤系統得到正確的追蹤方向，由功率對時間變化曲線也可看出加入本文所提之改善技術後，可改善照度變化當下的追蹤功率損失，並且本文同時針對連續照度變化下的情況進行模擬分析，藉由模擬結果可看出本文所提之改善技術也可針對連續照度變化之情況進行錯誤追蹤的改善。

The Photovoltaic generation systems (PGS) receive changing irradiance all the time, and drift will happen while the tracking system is working under fast-changing irradiance, so that drift will cause the power loss to the system. Because of this drift problem, developing a maximum power point tracking (MPPT) technique for fast-changing irradiance is crucial. In this regard, this thesis analyzes the tracking process of perturb and observe (P&O) method under the changing irradiance, generalize the drift will happen in which situation. For these drift situation, distinguish the changing current and short circuit method join in the traditional P&O method under the changing irradiance, enable tracking system will track to accurate direction and improve the drift under the changing irradiance.
To verify the feasibility of the proposed MPPT algorithm that it will work under the changing irradiance, simulate and analysis this method that joining P&O or not is constructed. It can be seen from the tracking process that the improved MPPT algorithm proposed in this thesis can make the tracking system track to the correct direction, from the figure of power-time changing curve the proposed method also can improve the power loss under the changing irradiance. And this thesis also simulate the proposed MPPT algorithm under continuous changing irradiance, it can be seen from the simulation result that the proposed method also can improve the drift under continuous changing irradiance.

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