发电厂主汽温系统的模糊滑模控制研究

电厂主汽温被控对象是一个典型的变参数、强扰动的对象,常规的PID控制器难以满足控制要求。针对此问题,设计一种自适应模糊滑模控制器。该控制策略基于带积分补偿的变结构控制器,并利用自适应模糊控制方法,把滑模控制器中的不确定项进行模糊逼近。利用李亚普诺夫函数证明了控制器的稳定性。将此控制策略应用到电厂主汽温控制系统中,仿真结果显示此控制方法具有较强的鲁棒性和良好的跟踪性能。

Fuzzy Sliding Mode Control for Main Steam Temperature System in Power Plant

The main steam temperature system is a typical controlled process with parameter-varying and force disturbance. Due to these characteristics, good control quality can＇t be gained when using the normal PID controller. In this paper, an adaptive fuzzy sliding mode control scheme is proposed. The control scheme is based on sliding mode controller with integral compensation. The uncertainties were fuzzed based on fuzzy theory. The stability of the proposed controller is shown using Lyapunov method. The proposed method is applied to main steam temperature system. Simulation results indicate that the control approach is robust and improves tracking accuracy considerably.