外文翻譯--蒸汽發(fā)生器水位模糊控制研究-wenkub.com
2025-05-07 05:57 本頁面
【正文】 我們還給出了秦山核電站的蒸汽發(fā)生器的仿真，并獲得了令人滿意的效果。假設(shè)預(yù)期水位從 0m上升到 10m，水位響應(yīng)如圖 3 中的實線所示。 控制系統(tǒng)的系數(shù) k1=k2=。模糊推理系統(tǒng)的基本屬性設(shè)置為：“與”算法為取小算法；“或”算法為取大算法。 (3)模糊控制規(guī)則列表 模糊控制規(guī)則建立的原則是：當(dāng)偏差大，輸出控制量應(yīng)該優(yōu)先以盡快消除偏差為主；當(dāng)偏差小，輸出控制量應(yīng)優(yōu)先消除超調(diào)。 k1， k2 是給水流量和蒸汽流量的傳感器的轉(zhuǎn)換系數(shù)。 傳統(tǒng) PID 控制器對于蒸汽發(fā)生器水位的控制效果不佳，存在“虛假液位”的現(xiàn)象，表現(xiàn)為跟蹤設(shè)定值時有較大的超調(diào)。綜合以上兩個因素，當(dāng)蒸汽流量階躍增加以后，水位下降會有一個延遲的過程，表現(xiàn)為先上升后下降?？梢詫⑺浑S蒸汽流量或者給水流量變化而變化看作一個簡單的一體化過程，蒸汽流量變化和給水流量變化對水 位的影響又是不同的。模糊控制不需要知道被控對象的精確的數(shù)學(xué)模型，它對過程參數(shù)的變化并不敏感，魯棒性很強，能夠克服非線性因素，因此，模糊控制有更快的響應(yīng)速度，更小的超調(diào)，更好的控制效果。但是蒸汽發(fā)生器的傳統(tǒng) PID 控制仍然存在著一些不足。為了保證核電廠運行的安全性，蒸汽發(fā)生器的水位必須控制在一定的范圍內(nèi)。 whereas, we should open the valve more. Through a prehensive analysis of expertise, the establishment of rule table shown in Table 1. Table 1. Fuzzy control rule table D. Fuzzy Reasoning and Solution This fuzzy inference system uses Mamdani. The basic properties of fuzzy inference system set to: and operation with a very small operation。 GS (s) for the effect of the steam flow (load) to the steam generator water level. The balance of the steam generator water level is maintained through the match between the water flow and steam flow. The process that water level changes with the steam flow or water flow changing can be regarded as a simple integration process, but impact of the water flow and steam flow ?s change on water level is different. A. Dynamics Characteristics under Water Flow Disturbance Suppose steam flow GS remains unchanged, and water flow GW step increases, on the one hand because the temperature of feed water is much lower than the temperature of saturated water in the steam generator, so that , when feed water entering, it will absorb a lot of extra heat, the vapor phase bubble contents will reduce, resulting in water level decreasing。 the steam generator?s water level must be controlled in a certain range. When the nuclear power plant is running, as the steam flow or the water flow changing, the amount of boiling bubbles in the steam generator will change due to local pressure or temperature change, the instantaneous water level showed “false water level” phenomenon . The existence of “false w
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