本文關(guān)鍵詞：微型壓縮空氣儲能發(fā)電系統(tǒng)建模及優(yōu)化控制　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 微型壓縮空氣儲能 混合建模 優(yōu)化控制 渦旋膨脹機(jī) 效率分析

【摘要】：可再生能源的大規(guī)模開發(fā)利用推動了全球能源體系的歷史變革,是緩解能源危機(jī)的重要手段之一。然而,風(fēng)能、太陽能等可再生能源具有較強(qiáng)的波動性及間歇性等特征,為電力系統(tǒng)中的儲能環(huán)節(jié)帶來了新的挑戰(zhàn)。諸多儲能方式中,壓縮空氣儲能因具有環(huán)境友好、壽命長、無相變損失以及容量易于監(jiān)控等突出優(yōu)點而備受國際社會關(guān)注。當(dāng)前,壓縮空氣儲能系統(tǒng)正向大規(guī)�；臀⑿突较虬l(fā)展,其中微型壓縮空氣儲能系統(tǒng)以其選址靈活、經(jīng)濟(jì)可靠等優(yōu)勢,日益得到學(xué)術(shù)界和產(chǎn)業(yè)界的高度關(guān)注。然而壓縮空氣儲能系統(tǒng)相對于其他儲能技術(shù)而言效率較低,是阻礙其大規(guī)模發(fā)展的重要因素之一。因此,為提高壓縮空氣儲能系統(tǒng)能量利用和轉(zhuǎn)換的能力,本文以微型壓縮空氣儲能發(fā)電系統(tǒng)為研究對象,從系統(tǒng)關(guān)鍵部件建模入手,多角度分析了系統(tǒng)效率的變化規(guī)律,并對系統(tǒng)效率的優(yōu)化控制方法展開了研究。壓縮空氣儲能系統(tǒng)效率分析與優(yōu)化控制的前提是建立系統(tǒng)關(guān)鍵部件的數(shù)學(xué)模型。本文選用渦旋式膨脹機(jī)作為能量轉(zhuǎn)換設(shè)備,并提出了一種基于機(jī)理和經(jīng)驗的渦旋膨脹機(jī)混合建模方法。該方法綜合考慮氣體泄漏、過欠膨脹及摩擦等因素的影響建立了渦旋膨脹機(jī)體積流量和輸出轉(zhuǎn)矩的機(jī)理模型,選取進(jìn)氣壓力、溫度和轉(zhuǎn)速等作為模型的控制變量,對其他參數(shù)進(jìn)行集總并利用大量的試驗數(shù)據(jù)訓(xùn)練未知參數(shù),最終獲得了渦旋膨脹機(jī)的混合模型。該混合模型兼顧機(jī)理模型的精確性和經(jīng)驗?zāi)Ｐ偷墓こ虒嵱眯?極適用于微型壓縮空氣儲能系統(tǒng)的效率分析和優(yōu)化控制。在渦旋膨脹機(jī)混合模型的基礎(chǔ)上,本文引入空氣有效能的概念建立了膨脹效率評價指標(biāo)。根據(jù)該效率評價指標(biāo),本文首先分析了渦旋膨脹機(jī)的膨脹效率隨進(jìn)氣壓力、溫度和轉(zhuǎn)速等控制變量的變化規(guī)律,可知不同進(jìn)氣壓力下存在最優(yōu)轉(zhuǎn)速使膨脹效率達(dá)到最大值。進(jìn)而,本文定量定性地分析了計及熱(冷)量的微型壓縮空氣儲能發(fā)電系統(tǒng)效率,仿真結(jié)果反映了有效利用系統(tǒng)產(chǎn)生的熱(冷)量可大幅提升系統(tǒng)能量綜合利用能力。最后,本文從空氣有效能的角度定量計算了由調(diào)壓閥造成的節(jié)流損耗,分析了不同節(jié)流壓力大小對系統(tǒng)效率的影響。本文在系統(tǒng)效率變化規(guī)律的基礎(chǔ)上提出了效率優(yōu)化策略,即在系統(tǒng)運(yùn)行達(dá)到穩(wěn)態(tài)時保證輸出功率平衡功率需求,同時驅(qū)動系統(tǒng)運(yùn)行于效率高效區(qū)。該優(yōu)化策略基于渦旋膨脹機(jī)混合模型,選用拉格朗日乘子法實現(xiàn)優(yōu)化算法,搜索系統(tǒng)最優(yōu)工作點。該優(yōu)化策略建立在混合模型的優(yōu)勢之上,大大簡化了優(yōu)化算法的復(fù)雜度,同時滿足精確性和快速性的工程需求,極適用于實時優(yōu)化控制系統(tǒng)。最后本文介紹了微型壓縮空氣儲能發(fā)電系統(tǒng)控制平臺,試驗驗證了基于渦旋膨脹機(jī)混合模型的效率優(yōu)化策略的合理性。通過試驗驗證了不同功率需求下的優(yōu)化結(jié)果,得出結(jié)論:本文提出的優(yōu)化策略能夠控制系統(tǒng)輸出功率匹配實時變化的功率需求,同時驅(qū)動系統(tǒng)運(yùn)行于效率高效區(qū)。
[Abstract]:The large-scale development and utilization of renewable energy to promote the global energy system of historical change, is one of the important means to alleviate the energy crisis. However, wind energy, solar energy and other renewable energy has a strong volatility and intermittent characteristics for power system energy storage has brought new challenges. A lot of energy storage, compressed air the storage because of its environmental friendliness, long service life, no phase loss and easy monitoring capacity advantages and the concern of the international community. At present, the compressed air energy storage system is a large-scale and miniaturization direction, the micro compressed air energy storage system with its location is flexible, economical and reliable advantages, has been highly concerned the academia and industry. However, the compressed air energy storage system other energy storage technology for low efficiency is relative to hinder the large-scale development of one of the important factors. This, in order to improve the ability of compressed air energy storage system energy utilization and conversion, based on micro compressed air energy storage power generation system as the research object, starting from the key parts of the system modeling, multi angle analysis of the variation of system efficiency and optimization control method on system efficiency is studied. System efficiency analysis premise and the optimal control is to establish the mathematical model of the key parts of the system. The compressed air energy storage scroll expander as energy conversion device, and proposes a hybrid modeling method of scroll expander mechanism and based on experience. This method considering the gas leakage, less influence factors such as friction and expansion mechanism model was built scroll expander volume flow and output torque, including intake pressure, temperature and speed as the control variables of the model, the other parameters are set and the use of a large number of The training test data of unknown parameters, finally got the mixed model of scroll expander. The hybrid model taking into account the practical accuracy of the mechanism model and experience model, is very suitable for the efficiency of the micro compressed air energy storage system analysis and optimization control. Based on the scroll expander mixing model, this thesis introduces the concept of air effective established expansion efficiency evaluation index. According to the evaluation index of the efficiency, this paper analyzes the expansion efficiency of vortex expands with the inlet pressure machine, variation of temperature and speed control variables, the different inlet pressure under the optimal rotation speed of the expansion efficiency reaches the maximum value. Then, the qualitative and quantitative analysis. Heat (cold) and the amount of micro compressed air energy storage power generation efficiency of the system, the simulation results show the effective use of the system generated heat (cold) can significantly enhance the comprehensive energy system The use of ability. Finally, this paper calculates the throttling loss caused by the pressure regulating valve of air quantity from the effective point of view, analyzes the influence of different sizes of throttle pressure on system efficiency. Based on the variation of the efficiency of the system is put forward on the efficiency optimization strategy, which is to ensure the output power balance of power demand in the operating system to achieve steady state at the same time, drive the system running in high efficiency area. The optimization strategy based on hybrid model of scroll expansion, using Lagrange multiplier method to realize optimization algorithm, the optimal operating point search system. The optimization strategy based on the advantages of the mixed model, greatly simplifies the complexity of optimization algorithm, and meet the requirements of engineering accuracy and fast the most suitable for real-time optimization control system. Finally, this paper introduces the micro compressed air energy storage power generation system control platform, experimental verification based on vortex The rationality of optimization strategy efficiency expander mixture model. Through the test results, the requirements of different power under this paper's power demand optimization strategy to control the system output power, time variation, and drive system running on the efficiency of high efficiency.

【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM619

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本文編號：1406121