外文翻譯--蒸汽發(fā)生器水位模糊控制研究-展示頁
2025-05-27 05:57本頁面
【正文】 extent, overe the false water level phenomenon. But the conventional PID control method in the process of steam generator water level control has some shortings. To the steam generator that has highly plex, large timedelay and nonlinear timevarying characteristics, the PID parameters tuning is a tedious job and the control effect is very poor. Furthermore, to achieve good control performance still as conditions changing, it often needs to change the PID controller parameters. But the analog PID controller parameters are difficult to regulate online. Fuzzy control is a kind of nonlinear control strategy based on fuzzy reasoning, which express operating experience of skilled manipulation men and mon sense rules of inference through vague language. Fuzzy control do not need to know precise mathematical model of controlled object, is not sensitive to the change of process parameters, is highly robust and can overe nonlinear factors, so, fuzzy control has faster response and smaller ultra tone, can get better control effect. Based on understanding above, this paper design a steam generator water level fuzzy controller, the simulation shows thatthecontroller has good control performance and practical value. II. DYNAMIC CHARACTERISTICS OF STEAM GENERATOR The transfer function of PWR steam generator’s mathematical model of the general form shows below: y(s)=GW(s)QW(s)+GS(s)QS(s) （ 1） where y is the steam generator water level。 QS for the steam flow。 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
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