【摘要】：鋼廠利用生產(chǎn)過程中產(chǎn)生的大量高爐和焦?fàn)t煤氣實(shí)施燃?xì)狻羝?lián)合循環(huán)發(fā)電工程,既實(shí)現(xiàn)了廢物利用,又減少了環(huán)境污染。在循環(huán)發(fā)電工程中,混合煤氣的壓力控制主要是通過大型氣動薄膜調(diào)節(jié)閥實(shí)現(xiàn)的,受氣動執(zhí)行機(jī)構(gòu)滯環(huán)特性和氣體可壓縮性大等因素的制約,煤氣壓力難以控制在系統(tǒng)允許的范圍內(nèi),這成為影響發(fā)電設(shè)備正常運(yùn)行的主要原因。針對該關(guān)鍵問題,利用電液執(zhí)行機(jī)構(gòu)精度高、速度快、動作穩(wěn)的特點(diǎn),提出了電液伺服控制調(diào)節(jié)閥技術(shù)。圍繞此項(xiàng)技術(shù),本文做了如下的研究工作： 首先,文章綜述了鋼廠循環(huán)發(fā)電工程及其存在的問題,介紹了調(diào)節(jié)閥技術(shù)的國內(nèi)外研究現(xiàn)狀,敘述了液壓伺服控制系統(tǒng)的組成、特征及發(fā)展趨勢,闡述了課題的研究意義。 其次,設(shè)計(jì)了調(diào)節(jié)閥的電液伺服控制系統(tǒng),通過計(jì)算,確定了系統(tǒng)的主要技術(shù)參數(shù),選擇了合適的系統(tǒng)元器件。分別用兩種方式建立系統(tǒng)數(shù)學(xué)模型,先利用機(jī)理建模方式建立了調(diào)節(jié)閥電液伺服控制系統(tǒng)的非線性數(shù)學(xué)模型,通過對系統(tǒng)Bode圖的分析,表明系統(tǒng)具有穩(wěn)定性。然后利用圖形化建模仿真軟件AMESim建立了系統(tǒng)的物理模型,這種方法更大程度地考慮了系統(tǒng)的細(xì)節(jié)問題,保證了仿真結(jié)果更接近實(shí)際狀況。 再次,在獲得傳遞函數(shù)的基礎(chǔ)上,針對液壓伺服系統(tǒng)非線性、時變的特點(diǎn),以及常存在著參數(shù)變化和負(fù)載干擾等因素的影響,深入研究一種控制策略。將自適應(yīng)控制理論中,基于廣義誤差具有可調(diào)增益的模型參考自適應(yīng)控制方法應(yīng)用到調(diào)節(jié)閥伺服控制系統(tǒng),建立了調(diào)節(jié)閥電液伺服系統(tǒng)自適應(yīng)控制模型,這種控制方法只需要根據(jù)被控對象輸入量和輸出量來設(shè)計(jì)自適應(yīng)控制系統(tǒng),保證了系統(tǒng)的穩(wěn)定性。借助于Matlab/Simulink仿真平臺進(jìn)行系統(tǒng)動態(tài)響應(yīng)的仿真研究,并利用AMESim控制軟件接口實(shí)現(xiàn)AMESim與Matlab的聯(lián)合仿真,結(jié)果表明,調(diào)節(jié)閥伺服控制系統(tǒng)動態(tài)特性滿足循環(huán)發(fā)電工程的要求。 最后,搭建了調(diào)節(jié)閥電液伺服控制系統(tǒng)實(shí)驗(yàn)臺,對調(diào)節(jié)閥控制系統(tǒng)的性能進(jìn)行了相關(guān)實(shí)驗(yàn)研究。通過實(shí)驗(yàn)研究可以看出,模型參考自適應(yīng)控制器具有較好的抗干擾性和自適應(yīng)性。結(jié)果表明,針對鋼廠循環(huán)發(fā)電工程中調(diào)節(jié)閥電液伺服控制系統(tǒng)應(yīng)用自適應(yīng)控制策略完全可行有效。
[Abstract]:A large number of blast furnace and coke oven gas produced in the production process are used in the steel plant to implement the combined gas-steam cycle power generation project, which not only realizes the waste utilization, but also reduces the environmental pollution. In the circulating power generation project, the pressure control of mixed gas is mainly realized by large pneumatic film regulating valve, which is restricted by the hysteresis characteristic of pneumatic actuator and the great compressibility of gas, etc. Gas pressure is difficult to be controlled within the allowable range of the system, which is the main reason that affects the normal operation of power generation equipment. Aiming at this key problem, the electro-hydraulic servo control valve technology is put forward by using the characteristics of high precision, fast speed and stable action of electro-hydraulic actuator. This paper has done the following research work around this technology: firstly, the paper summarizes the circulating power generation project and its existing problems in steel plant, and introduces the research status of regulating valve technology at home and abroad. The composition, characteristics and development trend of hydraulic servo control system are described. Secondly, the electro-hydraulic servo control system of the control valve is designed. The main technical parameters of the system are determined by calculation, and the appropriate system components are selected. Firstly, the nonlinear mathematical model of electro-hydraulic servo control system of regulating valve is established by means of mechanism modeling. By analyzing the Bode diagram of the system, it is shown that the system is stable. Then the physical model of the system is established by using the graphical modeling and simulation software AMESim. This method considers the details of the system to a greater extent and ensures that the simulation results are closer to the actual situation. Thirdly, on the basis of obtaining transfer function, a control strategy is deeply studied in view of the nonlinear and time-varying characteristics of hydraulic servo system, as well as the influence of parameter variation and load disturbance. In the adaptive control theory, the model reference adaptive control method based on the generalized error with adjustable gain is applied to the servo control system of the control valve, and the adaptive control model of the electro-hydraulic servo system of the control valve is established. This control method only needs to design the adaptive control system according to the input and output of the controlled object, which ensures the stability of the system. With the help of Matlab/Simulink simulation platform, the dynamic response of the system is simulated, and the joint simulation of AMESim and Matlab is realized by using the AMESim control software interface. The results show that the dynamic characteristics of the servo control system of the control valve can meet the requirements of the cycle power generation project. Finally, the control system of the control valve was set up, and the performance of the control system was studied. The experimental results show that the model reference adaptive controller has better anti-interference and self-adaptability. The results show that it is feasible and effective to apply adaptive control strategy to the electro-hydraulic servo control system of regulating valve in the circulating power generation project of steel plant.
【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】：2011
【分類號】：TH137

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 楊德金;一體化不壓井修井機(jī)液壓控制系統(tǒng)研究[D];沈陽工業(yè)大學(xué);2013年

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本文編號：2216670