大滞后控制系统性能的小波变换分析方法研究

A Study of the Performance of Long Time-Delayed Control System Using Wavelet Transform Analysis Method

过程控制系统以大滞后环节为特征,通常使用PID控制器来稳定系统性能。PID控制系统结构简单,倘若参数整定合适,系统将具有较强的鲁棒性。但是,在实际系统中,由于大滞后环节的存在,当参数调节不合适时,将会导致系统持续振荡。对于过程系统数据,应用小波变换后,可以确定精确的时滞时间,从而进行PID参数整定,更好地改善系统性能。

Process control systems are usually implemented feedback control systems such as PID controller for stabilizing the systems. The principle of PID control system is simple and the function is robust if it is well tuned however it tends to fall in sustaining oscillation state because of bad tuning in actual plants. By applying Wavelet transform to process system data precise delay time is identified and therefore the PID parameters could be better tuned.