Variable time delay hybrid control method for TITO NDCS

Abstract

The invention provides a variable time delay hybrid control method for a TITO (Two Input and Two Output) NDCS (Network Decoupling Control System) and belongs to the technical field of MIMO(Multiple Input and Multiple Output) NDCS with limited bandwidth resources. The method is used for the TITO NDCS with two input and two output signals that are influenced by and coupled with each other and requiring decoupling treatment. Due to network time delay generated in network data transmission among nodes, stability of closed loop control circuits is affected and the stability of the whole system is affected and even a problem of stability loss of the TITO NDCS may be caused. The invention proposes the method of replacing a network time delay compensation model with the network data transmission process among all the real nodes in the TITO NDCS and SPC and IMC are applied to the two circuits, so that measurement, estimation and identification of network time delay among the nodes can be eliminated; requirements for clock signal synchronization are reduced; influence on TITO NDCS stability by network time delay can be reduced; and system control quality is improved.

Description

technical field [0001] The present invention relates to automatic control technology, the intersection field of network communication technology and computer technology, especially relates to the technical field of multiple-input multiple-output network decoupling control system with limited bandwidth resources. Background technique [0002] In the network environment, sensors, controllers and actuators form a closed loop through the network medium to form a networked control system (Networked control systems, NCS). The typical structure of NCS is as follows: figure 1 shown. [0003] NCS injects new vitality into classic and modern control theory, and also poses new challenges to its system design: on the one hand, the introduction of the network will bring advantages such as saving investment and easy maintenance; on the other hand, it will also bring Latency, data packet loss and other complex phenomena, especially the existence of variable network delay, can reduce the q...

AI Technical Summary

Problems solved by technology

[0009] (2) The internal structure is much more complex than SISO-NCS

[0010] (3) There may be uncertain factors in the accused

[0011] In MIMO-NDCS, there are many parameters involved, and there are many connections between control loops, and the influence of parameter changes on the overall control effect will become very complicated.

[0012] (4) Failure of control components

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

[0018] (3) It is unrealistic to fully synchronize the clock signals of all nodes in different distribution locations in MIMO-NDCS

[0019] (4) Since in MIMO-NCS, the input and output influence each other and there is a coupling effect, the internal structure of MIMO-NDCS is more complicated than that of MIMO-NCS and SISO-NCS, and there may be more uncertain factors. It is much more difficult to implement delay compensation and control than MIMO-NCS and SISO-NCS

Images