【摘要】：自抗擾控制技術(shù)的原理是將對(duì)象模型的不確定性、外部擾動(dòng)以及參數(shù)的實(shí)時(shí)變化視為一個(gè)“總擾動(dòng)”,對(duì)其進(jìn)行實(shí)時(shí)估計(jì)并補(bǔ)償,因此不需要被控對(duì)象的精確模型就可以完成控制作用,大大簡(jiǎn)化了控制系統(tǒng)的設(shè)計(jì)。然而大型電廠熱工系統(tǒng)具有大遲延、大慣性、強(qiáng)非線性等特點(diǎn),加大了自抗擾控制中存在的參數(shù)較多難整定,穩(wěn)定性不易保證等問題。為提升現(xiàn)有自抗擾控制技術(shù)的性能以保證電力系統(tǒng)的穩(wěn)定經(jīng)濟(jì)運(yùn)行,本文主要做了如下幾個(gè)方面的改進(jìn)。首先,為了提高自抗擾控制器的抗擾性能,本文在線性自抗擾控制器結(jié)構(gòu)基礎(chǔ)上,設(shè)計(jì)了一種改進(jìn)型自抗擾控制器。通過增加一個(gè)相同的線性擴(kuò)張狀態(tài)觀測(cè)器,引入總擾動(dòng)的估計(jì)誤差值,并對(duì)該總擾動(dòng)估計(jì)誤差進(jìn)行觀測(cè)補(bǔ)償,達(dá)到提高抗擾性能的目的。其次,針對(duì)自抗擾控制器整定過程中存在的受觀測(cè)器帶寬限制的問題,對(duì)原有參數(shù)整定方法做出了改進(jìn),總結(jié)出了一套完整的參數(shù)整定步驟,該方法在保證整定過程簡(jiǎn)便性的同時(shí),大大減小了觀測(cè)器帶寬對(duì)擴(kuò)張狀態(tài)觀測(cè)器速度的影響。最后,為驗(yàn)證上述兩種改進(jìn)方法的有效性,將其應(yīng)用于某660MW超臨界機(jī)組協(xié)調(diào)控制系統(tǒng)。仿真實(shí)驗(yàn)表明,改進(jìn)型自抗擾控制技術(shù)可以獲得較好的跟蹤效果,較傳統(tǒng)控制方法快速性有所提高且抗擾性更強(qiáng),在工程上有一定的應(yīng)用價(jià)值。
[Abstract]:The principle of ADRC is to treat the uncertainty of object model, external disturbances and real-time changes of parameters as a "total disturbance", and to estimate and compensate them in real-time. Therefore, the control function can be accomplished without the precise model of the controlled object, which greatly simplifies the design of the control system. However, the thermal engineering system of large-scale power plant has the characteristics of large delay, large inertia and strong non-linearity, which makes it difficult to adjust the parameters of ADRC, and the stability is not easy to guarantee and so on. In order to improve the performance of the existing ADRC technology to ensure the stable and economical operation of the power system, the following improvements have been made in this paper. Firstly, in order to improve the anti-disturbance performance of ADRC, an improved ADRC is designed on the basis of linear ADRC structure. By adding the same linear extended state observer, the estimation error of the total disturbance is introduced, and the estimation error of the total disturbance is observed and compensated, so as to improve the anti-disturbance performance. Secondly, aiming at the problem of limited bandwidth of observer in the tuning process of ADRC, the original parameter tuning method is improved, and a set of complete parameter tuning steps are summarized. This method not only ensures the simplicity of the tuning process, but also greatly reduces the influence of observer bandwidth on the speed of the extended state observer. Finally, in order to verify the effectiveness of the two improved methods, they are applied to a 660MW supercritical unit coordinated control system. The simulation results show that the improved auto-disturbance rejection control technique can obtain better tracking effect, which is faster and stronger than the traditional control method, and has a certain application value in engineering.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;TM621

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本文編號(hào)：2443606