Deadband scheduling method applicable to networked control systems

Abstract

The invention relates to a deadband scheduling method applicable to network control systems and belongs to the technical field of networked control systems (NCS). The deadband scheduling method is characterized in that the deadband scheduling method aims to ensure that the output of a plurality of NCSs sharing a same network is satisfied to enter plus or minus 5 percent or plus or minus 2 percent of fluctuation range of a steady-state value of each system, a threshold value delta of each NCS deadband is selected as 0.05 or 0.02, a deviation rate ec(k) threshold value gamma are selected as 0.025, and whether a controller node needs to transmit a data pocket to an actuator node is determined through taking e(k) and ec(k) as double constraints; when the |e(k)| is less than Delta, and the |ec(k)| is more than Gamma, each system is in a stable state, and the controller node is not required to transmit a new data packet to the actuator node through the shared network; and when the |e(k)| is more than or equal to delta or the |ec(k)| is more than or equal to gamma, each system is in a transition process, the controller node is required to transmit a new data pocket to the actuator node through the shared network. With the adoption of the deadband scheduling method, network bandwidth resources can be saved, the bandwidth utilization rate is improved, and meanwhile, the systems not only can stabilize, but also can satisfy the steady-state quality requirements.

Description

technical field [0001] The invention relates to a network control system, in particular to a collaborative design method for control and scheduling in multiple network control systems with limited bandwidth resources, and belongs to the technical field of network control systems. Background technique [0002] In the distributed control system, the closed-loop feedback control system composed of sensors and controllers, controllers and actuators through a real-time communication network is called a networked control system (Networked control systems, abbreviated as NCS). [0003] Compared with the traditional point-to-point structure control system, NCS has the advantages of low cost, easy information sharing, easy expansion and maintenance, and great flexibility. It has been widely used in industrial process control in recent years. [0004] With the deepening of NCS research, the idea of ​​collaborative design of scheduling and control has gradually attracted the attention ...

AI Technical Summary

Problems solved by technology

[0035] In view of the problem that it is difficult to obtain the optimal value of the dead zone threshold δ in the NCS dead zone scheduling algorithm, the present invention proposes a method to ensure that the system satisfies multiple NCS performance and quality indicators that share the network in the same network. The new method of δ is used to solve the collaborative design problem of NCS control and scheduling in the network environment with time-varying information. It realizes the online dynamic allocation of network resources and improves the ability of NCS to cope with environmental changes.

Images