Time delay second-degree-of-freedom IMC method for two-input and two-output networked decoupling control system

Abstract

The invention discloses a time delay second-degree-of-freedom IMC method for two-input and two-output networked decoupling control system, and relates to the technical field of multiple-input and multiple-output networked decoupling control system. For a TITO-NDCS which has two-input and two-output signals which impact one another, and often requires decoupling if the two-input and two-output signals are coupled, since network time delay which occurs in the transmission of network data among nodes not only impacts the stability of respective closed-loop control circuit and also impacts the stability of another closed-loop control circuit and even causes instability of the TITO-NDCS, the method herein proposes to replace an inter-network time delay compensating model with network data transmission among all real nodes in the TITO-NDCS, and applies dynamic feedforward and IMC on two circuits. Therefore, the method can prevent measurement, estimation or discrimination of network time delay among the nodes, lowers the requirements for node clock signal synchronization, reduces the impact on the stability of the TITO-NDCS by uncertain network time delay, and improves control properties and quality of the system.

Description

technical field [0001] A time-delay two-degree-of-freedom IMC (Internal Model Control, IMC) method for a dual-input and dual-output network control system, which involves the interdisciplinary fields of automatic control, network communication and computer technology, and especially involves multiple-input and multiple-output network control with limited bandwidth resources systems technology field. Background technique [0002] With the development of network communication, computer and control technology, and the increasingly large-scale, wide-area, complex and networked development of production process control, more and more network technologies are applied to control systems. Networked control systems (NCS) refer to network-based real-time closed-loop feedback control systems. The typical structure of NCS is as follows: figure 1 shown. [0003] NCS can realize complex large systems and remote control, node resource sharing, and increase system flexibility and reliabil...

AI Technical Summary

Problems solved by technology

[0011] (3) There are many uncertain factors in the accused

[0012] In MIMO-NCS, there are many parameters involved, and there are many connections between the control loops, and the influence of the parameter change of the controlled object on the overall control performance will become more complicated.

[0013] (4) The control components are more likely to fail

Time delay leads to system performance degradation and even system instability, and also brings difficulties to the analysis and design of the control system

[0019] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NCS

[0020] (4) Since in MIMO-NCS, the input and output signals influence each other and may produce coupling effects, the internal structure of the system is more complex than that of SISO-NCS, and there are many uncertain factors. The control performance quality of each control loop Pros and cons and stability issues will have an impact and restriction on the performance quality and stability of the entire system, and its implementation of delay compensation and control is much more difficult than SISO-NCS

Images