傳統的固定步階式最大功率追蹤法會面臨追蹤速度及追蹤精確度之間的權衡問題。相較於傳統的固定步階式最大功率追蹤法，變動步階式最大功率追蹤技術可以秉持簡易計算優勢的前提下滿足追蹤速度及追蹤精確度。本文主要探討三種不同變動步階式擾動觀察法最大功率追蹤技術的性能，並開發一個以MATLAB為基礎之太陽能發電系統(Photovoltaic Generation System, PGS)模型進行驗證，並且針對各種操作條件下變動步階式方法之各項指標進行比較，如：穩態追蹤功率、上升時間、穩定時間及穩態追蹤精確度等。此外，本文也提出各方法之個別參數調整步驟，最後統整各方法的優缺點，並提出適當的設計建議。

Conventional fixed step-size maximum power point tracking (MPPT) methods exhibit a trade-off between tracking speed and tracking accuracy. By contrast, variable step-size MPPT techniques can achieve satisfactory tracking accuracy and speed while maintains advantage of simple calculation. This thesis aimed to study the performance of three different variable step-size Perturb and Observe MPPT techniques. Initially, a MATLAB based photovoltaic generation system (PGS) model is developed and validated. Then, variable step-size MPPT methods are compared in terms of various indices such as steady state power, rise time, settling time and steady-state tracking accuracy under various operating conditions. In addition, the tuning procedure of the parameters for each method is also proposed. Finally, advantages and disadvantages of each method are then summarized and relevant design suggestions are proposed.

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