本文關(guān)鍵詞：火電廠汽包水位控制器性能評估及優(yōu)化　出處：《長沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 汽水系統(tǒng) 性能評估 最小方差 PID控制器 遺傳算法 控制回路評估

【摘要】：當(dāng)前,各工業(yè)企業(yè)都在不斷推進自動化程度,火力發(fā)電行業(yè)亦是如此,隨著火力發(fā)電行業(yè)自動化水平的不斷提高,對控制器進行維護以保證控制品質(zhì)已經(jīng)越來越得到企業(yè)的重視。本文針對火電廠汽水系統(tǒng)控制器性能的評估問題,進行了理論研究及軟件的開發(fā)和應(yīng)用,具體工作如下：在理論上,對單回路、前饋-反饋以及串級控制器性能評估問題進行了研究,對汽包水位控制器使用最小方差方法進行了評估,較好的解決了火電廠汽包水位控制器控制性能的評估問題。在使用最小方差方法評估汽包水位串級三沖量控制器的過程中,將其改進為前饋-反饋控制系統(tǒng),并進行了相關(guān)的擾動研究。對火電廠汽包水位控制器進行了研究,首先使用基于摩擦模型的改進遺傳算法進行優(yōu)化,得到的PID參數(shù),模擬結(jié)果在超調(diào)和控制速度方面優(yōu)于參比結(jié)果,但仍然有一定的超調(diào)。其次,基于這種情況,對汽包水位控制器本身進行改進,在控制函數(shù)之間增加一個負反饋,改進后的控制器在原參數(shù)不變的情況下相對于參比結(jié)果超調(diào)量方面有所下降。最后,對改進過的控制器進行遺傳算法的主PID參數(shù)尋優(yōu),得到的結(jié)果在超調(diào)量和控制速度上優(yōu)于之前的結(jié)果。開發(fā)LPAss控制回路性能評估軟件,實現(xiàn)對火電機組汽水系統(tǒng)運行性能的監(jiān)測與評估。LPAss軟件在大唐來陽發(fā)電廠試驗運行的結(jié)果表明,該軟件能較好的實現(xiàn)對電廠汽水控制系統(tǒng)的性能監(jiān)測與評估,有效地減少了因汽水系統(tǒng)控制器控制品質(zhì)下降導(dǎo)致的電廠停機,同時也降低了控制人員的勞動強度。在火力發(fā)電行業(yè),基于本文提到的最小方差及改進遺傳算法對汽包水位控制器性能進行評估和優(yōu)化的方法,還未在公開發(fā)表的文章中看到,本文提出的火電廠汽水系統(tǒng)控制性能評估軟件,還未見相關(guān)報道。便于火電廠控制系統(tǒng)操作及維護人員,隨時進入軟件系統(tǒng),調(diào)取運行數(shù)據(jù)從而獲得當(dāng)下控制器的控制水平,大大簡化了控制系統(tǒng)評估的工作量,具有在火力發(fā)電系統(tǒng)中進行推廣使用的前景,對于提高火力發(fā)電廠控制水平具有非常重要的實踐意義。
[Abstract]:At present, the industrial enterprises are constantly promoting the degree of automation, thermal power industry is the same, with the continuous improvement of the level of automation of thermal power industry. More and more attention has been paid to the maintenance of the controller to ensure the control quality. In this paper, theoretical research and software development and application are carried out to evaluate the performance of the steam water system controller in thermal power plant. The main work is as follows: in theory, the performance evaluation problems of single loop, feedforward feedback and cascade controller are studied, and the minimum variance method is used to evaluate the drum water level controller. It solves the problem of evaluating the control performance of the steam drum water level controller in thermal power plant. In the process of using the minimum variance method to evaluate the cascade three impulse controller of the steam drum water level, it is improved as a feedforward feedback control system. The related disturbance is studied. Firstly, the improved genetic algorithm based on friction model is used to optimize the PID parameters of steam drum water level controller in thermal power plant. The simulation results are better than the reference results in the speed of overharmonic control, but there is still some overshoot. Secondly, based on this situation, the drum water level controller itself is improved. Add a negative feedback between the control functions, the improved controller in the case of the original parameters invariant relative to the results of the overshoot decreased. Finally. The main PID parameters of the improved controller are optimized by genetic algorithm, and the results are superior to the previous results in overshoot and control speed. The performance evaluation software of LPAss control loop is developed. Monitoring and evaluating the performance of steam and water system of thermal power units. LPASS software is tested in Datang Lai Yang Power Plant. The software can monitor and evaluate the performance of steam and water control system in power plant, and effectively reduce the power plant shutdown caused by the deterioration of the control quality of the steam water system controller. At the same time, it also reduces the labor intensity of the control personnel. In the thermal power industry, based on the minimum variance mentioned in this paper and the improved genetic algorithm to evaluate and optimize the performance of the drum water level controller. It has not been seen in the published article that the control performance evaluation software of steam and water system of thermal power plant has not been reported yet. It is convenient for the operation and maintenance of the control system of thermal power plant to enter the software system at any time. In order to obtain the control level of the current controller, it greatly simplifies the workload of the evaluation of the control system, and has the prospect of popularizing and using in the thermal power generation system. It is of great practical significance to improve the control level of thermal power plant.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM621.6

【參考文獻】

相關(guān)期刊論文 前1條

1 程啟明;鄭勇;杜許峰;郭潤清;;自抗擾控制器串級三沖量汽包水位控制系統(tǒng)[J];熱能動力工程;2008年01期

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本文編號：1417907