近年來由於化石燃料的枯竭造成能源成本日益攀升，因此發展乾淨且對環境友善的發電系統已變得日益迫切。隨著全球對能源的需求越來越高，各國開始尋找替代能源，在眾多新的替代能源中，熱電(Thermoelectric, TE)模組可以將熱能轉換成電能，因此在運輸或工業部門上之應用令人期待。熱電發電(Thermoelectric Generator, TEG)是一種能量轉換技術，可以將熱能直接轉換成為電能，反之亦然。熱電發電系統相當有彈性，其應用包含小至mW的系統大至數kW 的系統。熱電發電系統的優點包括不需維修、無噪音運轉、對環境友善以及可靠度較高等。此外，只要穩定且持續的提供溫差，熱電發電系統即能不停歇的產出電力。
本研究提出一新型混合式最大功率追蹤 (Maximum Power Point Tracking, MPPT)，結合簡單容易實現的擾動觀察法(Perturb and Observe, P&O)技術與具快速追蹤之開路電壓法(Open Circuit Voltage, OCV)，所提的方法具有追蹤速度快、不需額外電路及沒有額外的功率損失等特性。為了驗證所提出之最大功率追蹤技術的可行性，本文將其實際應用於工廠的廢熱回收系統上，總回收能量達1.2kW。與傳統的擾動觀察法相比，此方法在溫差分別為ΔT=60°C與ΔT=180°C時可以提高追蹤速度達42.9%與86.2%。且溫差分別為ΔT=60°C與ΔT=180°C時功率損失可以進一步減少24.0%與87.0%。

Due to the escalating energy costs and the depletion of fossil fuel sources, the search for cleaner and environmental friendly energy becomes increasingly urgent. These growing global issues force public to seek for alternative methods of generating electrical power. Among the feasible technologies for this purpose, thermoelectric (TE) energy converter is gradually earning interest because of its ability to transform heat given out from the transportation or industrial sectors into electricity. Thermoelectric generator (TEG) is an energy conversion technology which allows thermal energy directly converting into electrical energy and vice versa. TEG modules are flexible and thus can be utilized in systems from the miniature Milliwatt level to large-scale Kilowatt applications. Advantages of TEG include free maintenance, silent operation, eco-friendliness and high reliability. Furthermore, TEG is capable of generating electricity continuously as long as there are a heat source and a cold source.
In this dissertation, a novel hybrid maximum power point tracking (MPPT) method suitable for TEG system is proposed and investigated. The proposed MPPT technique combines the simplicity of perturb and observe (P&O) method and the fast tracking ability of open circuit voltage (OCV) method. The advantages of the proposed MPPT approach include fast tracking speed, no additional circuit required and no temporary power loss. To validate the feasibility of the proposed MPPT technique, an 1.2 kW thermoelectric generation system for industrial waste heat recovery is also constructed, experimental results show that comparing with conventional P&O technique, the proposed method can improve the tracking speed for 42.9% and 86.2% when temperature differences are ΔT=60°C and ΔT=180°C, respectively. Moreover, the energy loss can be improved by 24.0% and 87.0% when temperature differences are ΔT=60°C and ΔT=180°C, respectively.

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