HP 311143-001
HP 311143-001
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司 http://www.xrdzidonghua.com
HP 311143-001圖 1 所示為過(guò)熱器的狀態(tài)觀測(cè)器,整個(gè)過(guò)熱器劃分為四段,對(duì)每一分段又可簡(jiǎn)化為一階慣性環(huán)節(jié),整個(gè)過(guò)熱器就是四階慣性環(huán)節(jié)。至于時(shí)間常數(shù) T 通常是單元機(jī)組負(fù)荷的函數(shù),可作為狀態(tài)反饋控制系統(tǒng)中的一個(gè)待定因變量,在運(yùn)行過(guò)程中通過(guò)觀測(cè)試驗(yàn)進(jìn)行參數(shù)整定。
圖 1 過(guò)熱器的狀態(tài)觀測(cè)器及其狀態(tài)反饋示圖
為了更好地反映被控對(duì)象的動(dòng)態(tài)特性,故將過(guò)熱器的狀態(tài)觀測(cè)器設(shè)計(jì)為“增量形式”,即將過(guò)熱器入口溫度偏差和出口溫度偏差引入狀態(tài)觀測(cè)器,這樣觀測(cè)到的狀態(tài)變量更明確地反映了溫度的變化方向,同時(shí)過(guò)熱器入口溫度偏差的引入使?fàn)顟B(tài)觀測(cè)器具有了預(yù)測(cè)控制的某些特點(diǎn)。為適應(yīng)過(guò)熱器參數(shù)的變化,入口溫度設(shè)定值,出口溫度設(shè)定值及時(shí)間常數(shù) T 均為鍋爐負(fù)荷的函數(shù)。
設(shè)過(guò)熱器導(dǎo)前區(qū)傳遞函數(shù)為 ,惰性區(qū)傳遞函數(shù)為
則
狀態(tài)觀測(cè)器的反饋矩陣 Kc=[K c1 , K c2 , K c3 , K c4 ] ;狀態(tài)反饋矩陣 K=[K 1 , K 2 , K 3 , K 4 , K 5 ] ,其中 K 1 為過(guò)熱器導(dǎo)前區(qū)的反饋增益。
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