太陽能因具有環保和取之不盡用之不竭的特點，是非常重要的再
生能源之一。而減少太陽能電池的體積、降低價格和增加轉換效率已
成為其得以商品化的重要因素。造成太陽能電池轉換效率過低的原因
在於在不同的太陽照度與環境溫度下，其輸出電壓及電流是呈現非線
性的特性。因此，需要藉由太陽能最大功率追蹤技術（MPPT）的快
速響應來使太陽能電池在任何環境下皆可以產生最大的功率輸出。
傳統擾動觀察法之主要缺點為會在最大功率點附近來回震盪和
其響應速度會因震盪而變慢。以固定的擾動值來說，在穩態下的震盪
情形會與擾動值的大小成正比。較大的擾動值追蹤速度較快但會造成
較高的震盪情形，相反地，較小的擾動值雖有較小震盪卻使追蹤速度
變慢。為了解決此問題，本文提出了變動步階式之擾動觀察法，
相較於傳統固定步階式擾動觀察法，所提出之變動步階式擾動觀
察法可提升暫態時追蹤速度和穩態時的輸出效能。所提出之太陽能最
大功率追蹤系統是由升壓式轉換器和微處理器dsPIC 所組成，經由不
同操作條件下之實驗結果，證明了所提出的方法具由可行性且性能也
優於傳統方法。

Photovoltaic (PV) energy is one of the most important renewable
energy sources since it is clean, free and inexhaustible. For the
commercialization of PV energy, the reduction of the cost and size, and
the improvement of conversion efficiency have become important
concerns. The main reason for the low conversion efficiency of the PV
modules are the non-linear voltage-current (V-I) characteristics, which
depends on the solar insolation and panel temperature. In order to
enhance the output power, a maximum power point tracking (MPPT)
technique with quick response and accurate tracking capability is
required.
Conventional Perturb and Observe (P&O) techniques suffer from
several disadvantages such as sustained oscillation around the
maximum power point and fast tracking versus oscillation tradeoffs.
For fixed perturb values, the steady-state oscillations are proportional to
the step size. The larger step size causes the higher oscillation. On the
other hand, the smaller step size results in the slower response. To
overcome this problem, a variable step size P&O method is proposed in
this thesis. By using the deviation of power (P) of the recent iteration,
the required control variable (duty cycle variance) can be deduced. In
this thesis, the power stage of the PV system is constructed by the boost
converter and the Microcontroller dsPIC.
Comparing to the conventional fixed step size P&O method, the
experimental results show that the proposed system can improve the
tracking speed and the steady state performance of the MPPT
III
comparing to conventional fixed-step perturb and observe (P&O)
method.

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