Deadband scheduling method applicable to networked control systems

A technology of network control system and scheduling method, applied in the field of collaborative design of control and scheduling, can solve the problem of difficulty in obtaining the optimal value of the dead zone threshold δ, and achieve the effect of strengthening collaborative design and ensuring effective utilization

Inactive Publication Date: 2012-10-03
HAINAN UNIVERSITY
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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 ...

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  • Deadband scheduling method applicable to networked control systems
  • Deadband scheduling method applicable to networked control systems
  • Deadband scheduling method applicable to networked control systems

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Embodiment Construction

[0085] The following will refer to the attached figure 1 And attached figure 2 Exemplary embodiments of the present invention will be described in detail to make the above-mentioned features and advantages of the present invention clearer to those skilled in the art.

[0086] It should be noted that the dead-zone scheduling method suitable for networked control systems proposed by the present invention is realized by placing it in the controller nodes of each NCS control loop sharing the same network resource.

[0087] The specific implementation steps are as follows:

[0088] Step 1: The sensor nodes of each NCS control loop working in the time-driven mode periodically sample the output value of the corresponding controlled object at their respective sampling time, and pass the actual output signal of the controlled object obtained by sampling through Share the network and transmit to the corresponding controller nodes of each NCS control loop;

[0089]Step 2: The control...

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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 ...

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Application Information

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IPC IPC(8): H04L12/56H04L12/753
Inventor 杜锋雷榰任佳郭成孟祥宇冯亚沛
Owner HAINAN UNIVERSITY
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