外文翻譯--蒸汽發(fā)生器水位模糊控制研究-wenkub
2023-05-19 05:57:11 本頁面
【正文】 ater level” made it difficult to control the water level. The introduction of feedforward control to the traditional singleloop PID control can, in a certain 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。 QW for the water flow。 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
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