摘要
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,设计了模糊滑模控制策略。采用模糊规则,估计出系统中未知的不确定因素。同时用一个合适的饱和函数替代切换函数中的符号函数,有效地减弱了系统颤振。证明了该控制策略的稳定性。仿真结果显示,在参数慑动变化和出现强扰动的情况下,模糊滑模控制策略比传统的PID控制器有更加优良的性能。
The main steam temperature system is a typical controlled process with parameter-varying and force disturbance. Due to these characteristics, good control quality can not be gained when using the normal PID controller. A fuzzy sliding mode control method is proposed. Fuzzy logic control is used to estimate the uncertain elements. The sign function of the switching surface function is replaced by a suitable saturated function to reduce the system chattering. The control law of slide mode is deduced and its stability is proved. Simulation results show that the system using this method has better performances than PID control system un- der load disturbance and parameter-varying conditions.
出处
《现代电力》
2008年第1期63-66,共4页
Modern Electric Power
关键词
主汽温
滑模控制
模糊控制
饱和函数
main steam temperature
sliding mode control
fuzzy control
saturated function
