超超临界机组分离器水位模糊控制仿真研究

Simulation of Fuzzy Control for Water Level of Steam Separator in Ultra Supercritical Units

摘要:

超超临界机组汽水分离器在机组启动及高、低负荷下的运行状态不同,所起到的作用也不同;在汽水分离器湿态运行模式下,分离器内为汽水混合物,分离器起汽水分离作用,因此通过控制给水流量来控制分离器水位对机组的稳定运行起着重要作用;通过设计模糊控制器来实现汽水分离器的水位控制,并采用 MATLAB 仿真软件对控制系统进行仿真,得出相关参数和运行曲线;结果表明,采用模糊控制能够有效的避免或削弱PID控制中超调的现象,且具有较强的鲁棒性,有效地提高了控制品质。

Abstract:

The operating status of the steam separator of ultra supercritical units is different during unit start-up and high or low load; and the role of the steam separator is also different. In the steam separator wet operating mode, steam water mixtures co-exist with superheated steam in the separator. The separator plays the role in separating uperheated steam from the steam water mixtures. Thus, by controlling feedwater flow to control water level of the separator for stable operation of the unit plays an important role. In this paper, the fuzzy controller is designed to control the water level of the steam separator. And using MATLAB simulation software to control simulate the system, drawing relevant parameters and operating curve. The results show that the fuzzy control can effectively prevent or impair the overshoot of the PID controller, and has a strong robustness, this improved the quality of control effectively.