研究生: |
陳珮弦 Chen, Pei-Hsuan |
---|---|
論文名稱: |
微型固態氧化物燃料電池輔助動力系統冷啟動控制模擬與分析 Cold Start Control Simulation and Analysis of a Micro SOFC Auxiliary Power Unit |
指導教授: |
洪哲文
Hong, Che-Wun |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 動力機械工程學系 Department of Power Mechanical Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 58 |
中文關鍵詞: | 固態氧化物燃料電池 、非線性控制 |
外文關鍵詞: | SOFC, Nonlinear contorl, Matlab\Simulink |
相關次數: | 點閱:2 下載:0 |
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本論文內容在於建構與模擬微型固態氧化物燃料電池輔助動力系統(SOFC APU)冷啟動之動態表現,如壓力、溫度等特性,利用空氣動力學、熱力學及燃料電池電化學等原理,架構一套Matlab/Simulink模組,模擬固態氧化物燃料電池的動態表現再與燃料電池的實驗結果相互比較驗證。
微型固態氧化物燃料電池輔助動力系統藉由微型燃料電池、熱交換器和燃燒室等機構整合其動力,其優點為可以高效率持續發電、性能穩定、熱電共生等,且可以接受有雜質氣體或液體燃料,來源較其他低溫燃料電池廣泛,並且轉換效率為目前所有燃料電池效率最高者,然而代價為操作溫度高,所需啟動時間相當冗長,此條件限制了許多工程應用的可能性,例如車輛動力或緊急發電機等,因此如何縮短啟動時間將是一重要課題,為了使升溫速度更為快速,透過回收預熱時所通過的廢氣,燃燒尚未使用的氫氣,利用燃燒時所釋放的熱能與尚未通過燃料電池之燃料與空氣進行熱交換,達到燃料及空氣預熱的動作,接著利用預熱的氣體為燃料電池發電前的升溫動作,形成一個完整的升溫熱流系統。
直接利用燃燒所釋放的熱能,升溫梯度可能會過快,造成燃料電池材料的破壞,因此利用近代控制原理嘗試控制燃料電池的氣體控制閥口大小來掌控進入燃料電池的熱量多寡,以達到控制升溫曲線目的;本論文以工業界常見的PID控制器為基線,考慮到PID控制器強健性低且收斂時間長,故提出非線性控制可變結構之滑動模式控制器(Sliding Mode Controller)與倒階控制器(Backstepping Controller),可以縮短穩定時間及擁有較好的強健性,利用所架構之模擬系統分別模擬「安全啟動」及「快速啟動」條件下,不同控制器的控制結果並加以分析與比較。
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