發(fā)布時(shí)間：2018-02-26 16:17

  本文關(guān)鍵詞： 超臨界機(jī)組 協(xié)調(diào)控制系統(tǒng) 魯棒控制 LMI 系統(tǒng)辨識(shí) 控制器降階 協(xié)調(diào)-主汽溫聯(lián)合控制　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著超臨界火力發(fā)電機(jī)組逐漸成為我國(guó)火電領(lǐng)域的重要發(fā)展方向,對(duì)其控制的要求也不斷提高,然而機(jī)組具有較高的溫度與壓力,并且伴隨著非線性、強(qiáng)耦合等復(fù)雜特點(diǎn),因此需要不斷深入對(duì)超臨界協(xié)調(diào)控制系統(tǒng)的研究。本文在總結(jié)了協(xié)調(diào)控制方案已有成果的基礎(chǔ)上,完成了超臨界機(jī)組魯棒控制器設(shè)計(jì)及控制器降階方法的研究,并提出了協(xié)調(diào)控制與主汽溫的聯(lián)合控制方案。其主要研究成果為:1)使用魯棒控制作為理論框架,設(shè)計(jì)了適用于超臨界協(xié)調(diào)控制系統(tǒng)的多變量魯棒控制器:按照系統(tǒng)定值跟蹤的控制目標(biāo),引入期望閉環(huán)響應(yīng)矩陣與輸出加權(quán)濾波器,構(gòu)建了系統(tǒng)的廣義對(duì)象,并基于線性矩陣不等式(Linear Matrix Inequality,LMI)方法求解該對(duì)象的魯棒控制問題,獲取滿足閉環(huán)系統(tǒng)H∞范數(shù)最小的控制器,確保系統(tǒng)符合魯棒穩(wěn)定性條件。通過與模型預(yù)測(cè)控制的仿真對(duì)比,驗(yàn)證了此方法的優(yōu)越性,能滿足電廠復(fù)雜的控制需求。2)由于高階控制器在分布式控制系統(tǒng)(Distributed Control System,DCS)中實(shí)現(xiàn)困難,給出了基于系統(tǒng)辨識(shí)理論的控制器降階方法:將高階控制器作為待辨識(shí)模型,采用廣義二進(jìn)制噪聲(Generalized Binary Noise,GBN)信號(hào)開環(huán)激勵(lì)控制器,獲取辨識(shí)實(shí)驗(yàn)中控制器的輸入輸出數(shù)據(jù),在滿足辨識(shí)相對(duì)誤差較小的前提下,選擇低階模型進(jìn)行辨識(shí)。此外針對(duì)PID控制器在實(shí)際電廠的普及,提出了低階模型轉(zhuǎn)換為PI以及基于離散PID結(jié)構(gòu)的參數(shù)辨識(shí)方法,仿真結(jié)果表明,辨識(shí)結(jié)果令人滿意,并且能基本保留降階前的控制品質(zhì),為電廠PID的結(jié)構(gòu)與參數(shù)整定帶來了全新的思路。3)通過對(duì)超臨界機(jī)組主汽溫的特性及現(xiàn)有控制方法的分析,提出了協(xié)調(diào)-主汽溫聯(lián)合控制系統(tǒng):引入與主汽溫存在耦合關(guān)系的物理量,該變量與協(xié)調(diào)控制系統(tǒng)相關(guān),因此構(gòu)建聯(lián)合控制系統(tǒng),充分考慮對(duì)主汽溫產(chǎn)生影響的因素來實(shí)現(xiàn)對(duì)其更全面的控制。之后,采用魯棒控制及降階框架對(duì)該系統(tǒng)設(shè)計(jì)控制器,通過仿真驗(yàn)證了該控制系統(tǒng)優(yōu)于傳統(tǒng)方法,減少耦合變量對(duì)主汽溫干擾的同時(shí),保證對(duì)其控制的快速與穩(wěn)定。
[Abstract]:With the supercritical thermal power generating set gradually becoming an important direction of development in the field of thermal power in China, the requirements for its control are also increasing. However, the unit has a higher temperature and pressure, and accompanied by nonlinear, strong coupling and other complex characteristics. Therefore, it is necessary to study the supercritical coordinated control system deeply. On the basis of summarizing the existing achievements of the coordinated control scheme, the design of the robust controller for the supercritical unit and the method of reducing the order of the controller are studied in this paper. A joint control scheme of coordinated control and main steam temperature is proposed. The main research result is: 1) robust control is used as the theoretical framework. A multivariable robust controller suitable for supercritical coordinated control system is designed. According to the control target of constant value tracking of the system, the expected closed-loop response matrix and the output weighted filter are introduced to construct the generalized object of the system. Based on the linear matrix inequality (LMI) method, the robust control problem of the object is solved, and the controller satisfying the minimum H 鈭，

本文編號(hào)：1538744