Interference Of Large Time Delay System Control Method

Time lag process is a complicated process, which exists in industry manufacture abroad, such as petrol plant, chemical plant, metallurgy, pharmacy, brewage and so on. Because of the existence of the time lag, the control action which is given currently won't been reflected in the output until it goes on a period of time, both the time lag of emendation and no coordination between disturbance and emendation will affect the quality of control. In addition, the existence of the time lag affects the stability of the system badly, and it may cause the extent of the system getting bigger and the regulative time getting longer, even it will bring a surge or dispersion. Disturbance is the other important actor affecting industry manufacture. While the system has a stronger disturbance, the measure value of system will keep away from the initialization in the control process, and it won't return the original state. Seen from the applied viewpoint, the phenomenon is unwarrantable. So the control of the system with larger time lag and stronger disturbance has been paid more attention all the while, and it becomes one of the most crucial disquisition problems.At first, the article has concluded some methods of control which are preferable and more mature method in the system with larger time lag and stronger disturbance field currently, and it has analyzed capabilities of various controllers which have been referred in this article. Through analyzing the serial control, this text has brought forward the applicable abundant and necessary condition of serial control methods. Then, the article has brought forward the time lag decomposition assume, which can establish the foundation in theory for overcoming the time lag burden in the control design of the time lag system, and which can supply a new basis in theory for system to use the serial control. Furthermore, the article has also concluded some preferable and more mature methods of serial control currently, after adopting the serial control framework, we can see that the control methods of the main controller and the subsidiary controllers have not only exerted each capability and advantage, but also integrated the virtue of serial control, such as timely control action, high work frequency and strong anti-jamming capacity, so it make the system actualize the control action more effectively and improve the quality of the system.