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研究生: 徐輔謄
Hsu, Fu-Teng
論文名稱: 採用倒傳遞類神經網路之數據預測方式用於平行發電系統之設計與控制
Design and Control of Parallel Power Systems using Back Propagation Neural Network-based Data Prediction Approach
指導教授: 吳煒
Wu, Wei
學位類別: 碩士
Master
系所名稱: 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年: 2018
畢業學年度: 106
語文別: 中文
論文頁數: 164
中文關鍵詞: 數據預測倒傳遞類神經網路電力配比
外文關鍵詞: Prediction, Back Propagation Neural Network, Power dispatch
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  • 近年來各發電廠為了因應碳排所造成溫室效應議題,開始使用較潔淨的甲烷原料取代以往的煤炭原料,由於煤炭高可靠且成本低廉的特性,使得煤炭仍為發電燃料供應的主要來源。為了使發電需求、發電成本與碳排之間取得平衡,本研究設計兩個分別以甲烷及煤碳為原料的發電系統,藉由倒傳遞類神經網路預測每月天然氣價格、煤碳價格及電力需求,並考慮系統動態及碳稅等相關因素以計算未來發電成本,針對兩個發電系統進行電力的配比計算。
    本研究透過Aspen Custom Modeler(ACM)建立的固態氧化物燃料電池模型並以Aspen Plus的內建單元及模型模擬整合天然氣複循環燃料電池系統(NGFC)及整合煤氣化燃料電池發電系統(IGFC),此兩個發電系統主要以固態氧化燃料電池(SOFC)以及汽渦輪系統(GT)作為主要發電方式,為了瞭解系統的特性及操作條件,使用靈敏度分析找出燃料處理程序(Fuel processor)、固態氧化燃料電池(SOFC)以及汽渦輪系統(GT)等主要架構的操作條件。
    此外,為了預測天然氣價格、煤碳價格及電力需求,以MATLAB內建的工具箱進行分析,以偏最小二乘回歸(PLSR)及高斯過程回歸(GPR)等方法找出適合建模的影響因素,並以倒傳遞類神經網路模型(BP-NN)為主要模型進行預測。
    為了進一步貼近實務的情況,將兩個發電系統進行動態模擬,基於庫存控制維持系統平衡,並考慮後燃器燃燒的安全考量設置交叉限制燃燒控制,並以此設計為後續品質控制設計的基礎,為了實現總發電量的彈性控制及進料量等限制,採用I串級模型預測控制器(MPC)進行控制,並以配比計算所得到結果作為控制設定點,在維持總電量需求的情況下達到設定點的需求。

    In recent years, power plants start to utilize methane instead of coal due to lesser carbon emissions and in order to deal with global warming. At present, coal remains to be the most reliable source of energy for power plant because of cheaper cost. Power generation requirements, costs and carbon emissions are the three primary factors that needs to be analyzed for an optimum energy production. Therefore, the study will analyze two power systems using methane and coal as raw materials. The study will cover the prediction of the cost of natural gas, coal and energy demand using the Back Propagation Neural Network. Moreover, the study will include related factors such as system dynamics and carbon tax to calculate future power generation costs followed by the power dispatch calculations.
    The study utilized the Aspen Custom Modeler® and Aspen Plus® model for the design of the two systems: natural gas fuel cell (NGFC) and integrated coal gasification fuel cell (IGFC). The partial least squares regression (PLSR) and Gaussian process regression (GPR) model was used to find the impact factors using the MATLAB® toolbox to predict the electricity demand, natural gas and coal prices. Moreover, this study discussed the dynamic simulation using the results of power dispatch as the setpoint of model predictive controls (MPC).
    The forecasted results showed a reduction error on the cost of coal and methane and the energy demand of about 26 – 78% and it can improve the GPR by at least 3% error.

    摘要 I Abstract III 誌謝 XIII 目錄 XV 圖目錄 XX 表目錄 XXIV 第一章緒論 1 1.1 前言 1 1.2 研究動機與目的 2 第二章理論與模型建立 4 2.1 燃料處理程序 4 2.1.1 熱力學模型 5 2.1.2物理性質 6 2.1.3 乾式重組反應動力學及反應器 7 2.1.4 煤汽化反應動力學及反應器 9 2.1.5 水煤氣轉移反應動力學及反應器 11 2.2固態氧化物燃料電池(SOFC)模組 12 2.2.1 燃料電池數學模式之假設 13 2.2.2 固態氧化物燃料電池系統模擬 13 2.2.3 燃料電池電化學模型 14 2.2.3.1 活化過電位 15 2.2.3.2 歐姆過電位 17 2.2.3.3 濃度過電位 17 2.2.4 燃料電池之動態質量守恆 18 2.2.5 燃料電池之能量守恆 21 2.2.6 燃料電池尾氣結合汽渦輪機發電程序 23 2.3 數據預測模型 25 2.3.1 BP類神經模型 25 2.3.2 高斯過程回歸模型 28 2.3.3 偏最小二乘回歸(PLSR) 30 2.4 狀態空間模型 31 2.5 非線性ARX模型 35 2.5 模型預測控制(Model predictive control-MPC) 37 2.5.1滾動優化 38 2.5.2回饋校正 41 2.5.3參考軌跡 42 第三章 發電進料與電力需求之預測分析 44 3.1.天然氣價格預測 47 3.2 煙煤價格預測 52 3.3 電力需求預測 59 第四章 平行式發電系統之穩態模擬分析 66 4.1整合天然氣複循環燃料電池系統(NGFC) 66 4.2.1 甲烷乾式重組燃料處理模擬分析 67 4.2.2 固態氧化物燃料電池穩態模擬分析 72 4.2.3獨立熱電共生系統 76 4.2.4獨立式熱電共生系統的設計架構 76 4.2.5汽渦輪發電及固態氧化物燃料電池發電模擬分析 79 4.2.6發電系統的穩態結果 82 4.3 整合煤氣化燃料電池發電系統(IGFC) 87 4.3.1煤汽化燃料處理模擬分析 87 4.3.2 水煤氣轉移反應穩態模擬分析 90 4.3.3固態氧化燃料電池穩態模擬分析 94 4.3.4獨立熱電共生系統 96 4.3.5獨立式熱電共生系統的設計架構 96 4.3.6汽渦輪發電及固態氧化物燃料電池發電模擬分析 101 4.3.7發電系統的穩態結果 105 第五章 平行發電系統之動態模擬及發電量配比計算 110 5.1系統之自由度分析 110 5.1.1整合天然氣複循環燃料電池系統自由度計算 112 5.1.2整合煤氣化燃料電池發電系統自由度計算 115 5.2系統之基礎控制環路設計 119 5.2.1 NGFC系統之庫存控制迴路建立 119 5.2.2 IGFC系統之庫存控制迴路建立 121 5.2.3系統之交叉限制燃燒控制設計 125 5.3系統鑑別 128 5.3.1 系統動態特性分析 128 5.3.2 Nonlinear ARX模型 131 5.4 平行發電系統之發電配比與分析 133 5.4.1 發電配比計算 133 5.4.2 發電配比結果分析 139 5.5系統之品質控制策略設計 144 5.5.1平行發電系統總發電量之操作控制(CS1) 144 5.5.1.1 線性模型預測控制器之總發電需求控制 145 5.5.1.2 PID串級MPC之總發電需求控制 150 5.5.2 藉由二次規劃穩定總發電需求之操作控制(CS2) 154 第六章結論 160 參考文獻 162

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