大纯滞后系统的一种PID预估控制方法  

A PID Predictive Control Method For Time-Delay Systems With Long Pure Time Delay

作　　者：吕群[1] 于标[1] 

机构地区：[1]扬州职业大学,江苏扬州225002

出　　处：《武汉职业技术学院学报》2007年第5期87-90,共4页Journal of Wuhan Polytechnic

摘　　要：常规PID调节器不能对大纯滞后对象进行有效控制,当τ/T≥0.5时常规PID调节器已很难获得良好的控制性能,以至系统失去稳定性。文章提出了一种预估控制方法,能对大纯滞后系统进行有效控制。该控制方法与纯滞后时间τ无关,方法简单,易于工程实现,使常规PID调节器在大纯滞后系统的控制中如同对无纯滞后系统的控制一样有效。同时证明了该法使系统的稳定性与系统的纯滞后无关,经MATLAB仿真验证,该法具有良好的控制品质,且能适应对象参数和结构有一定变化的时滞系统。此外对系统扰动的补偿做了一定的讨论,提出了一些较有效可行的补偿方法。A general PID-controller can not control time-delay systems with pure long time delay effectively. When τ/T reaches above 0.5 , PID-controller can hardly gain the good control of them and even have the systems lose their stability. This paper presents a predictive control method for time-delay systems with long pure time delay,which can control them effectively. The τ-pure time delay is not involved in the method, which is simple and can be apply easily to engineering ; With this method, the general PID-controller can be as effective as no time-delay systems in controlling time-delay systems with long pure time delay . The paper proves that the new predictive control method makes the control systems＇ closed-loop stability irrelevant to the τ-pure time delay. It has been proved with the simulation of MTALAB that the method has in place good control quality and can be suitable to systems with parameters and structure-varying within a limit. In addition , the paper discusses the disturbance compensation for the time-delay system and proposes feasible compensating methods.

关 键 词：稳定性 时滞系统 预估控制方法 扰动补偿 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]