外文翻譯--蒸汽發(fā)生器水位模糊控制研究(存儲版)
【正文】 negative middle), NS (negative small), ZO (zero), PS (positive small), PM (positive middle) and PB (positive big) to describe. e, ec and, Δu are all using triangular membership function (see Figure 2) Figure 2. Input and output variable membership function C. Fuzzy control rule table The establishment principle of fuzzy control rules are: when the error is large, the output control volume should give priority to eliminate error as soon as possible。中文 2064 字 Research on Fuzzy Control for Steam Generator Water Level I . INTRODUCTION The steam generator is one of the main devices in PWR nuclear power plant, in order to ensure the safety of nuclear power plant during operation。 when the error is small, the output control volume should givepriority to prevent overshoot. Where ec is negative ,it shows that water level has a rising trend, if the water level is high at this time, then we should reduce the valve opening signal。將前饋控制引入到傳統(tǒng)的單回路 PID 控制中，可以在一定程度上克服“虛假液位”的問題。 蒸汽發(fā)生器水位的平衡是靠蒸汽流量和給水流量的匹配來維持的。這個現(xiàn)象就稱為“虛假液位”現(xiàn)象。 e， ec 和Δ u 都采用三角形隸屬函數(shù)（如圖 2）。當(dāng)負荷為 15% ~ 90% Ps 時，用公式 (6) 和 (8)，當(dāng)負荷小于 15% Ps 時，用公式 (7)和 (8)。 本論文針對蒸汽產(chǎn)生器大延遲和模型不確定的特性，設(shè)計了一個水位模糊控制系統(tǒng)。為了比較模糊控制器增加的效果，我們也作出傳統(tǒng) PID 控制的仿真結(jié)果。模糊蘊含采用取小算法；模糊綜合采用取大算法；清晰化采用重心法。為了保證給水流量等于蒸汽流量， k1和 k2 應(yīng)該相等。 給水流量或者蒸汽流量階躍減少對水位的影響與上述有相似的原理?；谝陨狭私猓疚脑O(shè)計了一個蒸汽發(fā)生器水位的模糊控制器，仿真結(jié)果表明這個控制器有更好的控制效果和實用價值。核電廠的運行中，因為蒸汽流量和給水流量的改變，蒸汽發(fā)生器里沸水中的氣泡數(shù)量會隨著局部氣壓和溫度的變化而改變，瞬時水位呈現(xiàn)“虛假液位”現(xiàn)象。 on the other hand, the increase in water flow GW made it greater than steam load, and cause water level increases linearly. Comprehensive two factors, after the step increase of the water flow, the water level rise has a time delay process, showing a down then up. B. Dynamic Characteristics under Steam Load Disturbance Suppose feed water flow GW remains unchanged, and steam load GS step increases, on the one hand the water level will flow down because the steam flow rate is greater than the water flow rate. On the other hand, as the steam load increased, vapor pressure is reduced。 the steam generator?s water level must be controlled in a certain range. W
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