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系統識別號 U0026-0812200915175939
論文名稱(中文) 應用模糊控制器於一新穎二維太陽追蹤器之研究
論文名稱(英文) Study of A Novel Two-Axis Sun Tracker Based on Fuzzy Logic Controller
校院名稱 成功大學
系所名稱(中) 工程科學系碩博士班
系所名稱(英) Department of Engineering Science
學年度 97
學期 2
出版年 98
研究生(中文) 陶振宇
研究生(英文) Chen-Yu Tao
學號 n9696108
學位類別 碩士
語文別 英文
論文頁數 99頁
口試委員 口試委員-林明權
口試委員-周榮華
指導教授-陳添智
口試委員-黎碧煌
口試委員-謝旻甫
中文關鍵字 模糊控制器  太陽追蹤器 
英文關鍵字 Fuzzy logic controller  Sun tracker 
學科別分類
中文摘要 太陽能技術(PV technology)是現今應用於光電轉換技術上最普遍的一種方法。但是太陽能板的轉換效率容易被光線照射的角度、太陽輻射度、環境溫度和太陽能板上的陰影所影響。所以在太陽能技術中,如何增加太陽能板的轉換效率和減少太陽能板的成本是主要的研究。
在台灣大部分的太陽能板皆固定以朝南23.5度安裝,但每天的太陽運動軌跡皆不同,安裝角度固定的太陽能板發電效率無法發揮最大效益。此外,太陽能板的輸出功率值易受到太陽輻射度和環境溫度而呈現非線性的變化,如何求得最大功率點(MPP)也同樣是重要的課題。因此,不僅需要追蹤太陽的位置,同時也要求得最大功率點,如此一來在任何環境下,太陽能板的轉換效率才能達到最大。
本論文將介紹一個由太陽追蹤系統和最大功率追蹤系統所組成的系統。太陽追蹤系統包含一個以模糊控制器為基礎的新穎二維太陽追蹤器,如何設計太陽追蹤器和模糊控制器將會在本論文內說明。實驗結果將會顯示所設計的太陽追蹤器在室外環境下能準確的追蹤太陽位置。此外,太陽能板以固定朝南23.5度和利用太陽追蹤器追蹤到太陽後各自所產生的最大功率值也將會被比較。
英文摘要 Photovoltaic (PV) technology for the conversion of sunlight into electricity is already a cost-effective method for many applications in the whole world. But the conversion efficiency of the PV array would be influenced easily by several factors such as the relative direction of sun, solar irradiation, environment temperature and partially shaded on the PV array. So how to increase the PV array’s conversion efficiency and reduce the cost of PV array are the main focuses of the research in photovoltaic technology.
In Taiwan, majority of the PV arrays presently are installed towards south with 23.5 degrees immovably. But the orbit of sun is different everyday, the fixed direction of the PV array could not make the conversion efficiency maximum. Moreover, the amount of electric power generated by PV array is always changed nonlinearly with some conditions such as solar irradiation and environment temperature, it is important to acquire the maximum power point (MPP). Therefore, not only the direction of the sun should be tracked, but also the MPP of the PV array should be sought, afterward the conversion efficiency of the PV array will get maximum under any circumstance.
In this thesis, an overall system which will be investigated consists of sun tracker system and MPPT system. Sun tracker system includes a novel two-axis sun tracker based on fuzzy logic controller, how to design the sun tracker and fuzzy logic controller will be introduced in this thesis. The experiment results will show the accuracy of the designed sun tracker under outdoor environment and then the MPP under two different sun tracking processes (uses sun tracker tracking or installs PV array toward the sun with 23.5 degrees immovably) also will be compared.
論文目次 摘要.....................................................................................................................................I
Abstract.............................................................................................................................II
誌謝..................................................................................................................................III
Content.............................................................................................................................IV
List of Tables.....................................................................................................................VI
List of Figures..................................................................................................................VII
Symbols............................................................................................................................XI
Chapter 1 Introduction........................................................................................................1
1.1 Motivation.............................................................................................................1
1.2 Outline of this thesis..............................................................................................4
Chapter 2 Description of the Photovoltaic Array................................................................6
2.1 The Principle of Photo Voltaic Effect...................................................................6
2.2 The Category of the PV Cell...............................................................................10
2.2.1 Mono-Crystalline Silicon.........................................................................10
2.2.2 Poly-Crystalline Silicon...........................................................................10
2.2.3 Amorphous Silicon...................................................................................11
2.3. Equivalent Model of PV cell..............................................................................13
2.4 The Characteristic Curves of PV Array...............................................................14
Chapter 3 Analysis and Design of Sun Tracker System and MPPT System.....................22
3.1 Description of Light Dependent Resistor............................................................22
3.2 Design of the Sun Tracker...................................................................................27
3.3 Analysis and Design of Sun Tracker System......................................................35
3.3.1 The Flowchart of Sun Tracker System.....................................................35
3.3.2 Introduction and Design of Fuzzy Logic Controller................................39
3.4 Analysis of the MPPT System............................................................................47
3.4.1 Analysis of Boost Converter....................................................................47
3.4.2 Conventional MPPT Method...................................................................51
3.43 Proposed MPPT Method...........................................................................57
Chapter 4 Experimental Implementation..........................................................................59
4.1 Digital Signal Processor......................................................................................61
4.1.1 Detail Information of Digital Signal Processor........................................62
4.2 Introduction of Two-Axis Mechanism with two Stepping Motors.....................63
4.3 Stepping Motor Driver with LDR’s Resistance Measurement Circuit Board....70
4.4 Boost Converter Circuit Board............................................................................74
4.5 The Experimental Results...................................................................................76
4.5.1 Tracking Experimental Results of 7cm-Height Sun Tracker...................76
4.5.2 Sun Tracker Tracking Results under Outdoor Environment....................80
Chapter 5 Conclusions......................................................................................................95
5.1 Conclusions.........................................................................................................95
5.2 Suggestion for Future Research..........................................................................96
Reference..........................................................................................................................97
Vita...................................................................................................................................99
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