Fully Connected Clustering Based Software Defined Control System and Node Failure Analysis

基于全连通群的软件定义控制系统及节点故障分析

¹ School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
² Faculty of Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Received: 7 December 2018

Abstract

This paper proposes a Software Defined Control System (SDCS), which is a fully distributed controller scheme based on a fully connected cluster. The characteristic of SDCS is that the control task is virtualized into multiple Virtual Control Tasks (VCTs) and distributed on nodes with capabilities of computing and memory in the wireless network, there is no core node in the control system. The topologies of the wireless networks are inherently unstable, through constructing a Set of Migratable Nodes (SMN), a dynamic mapping relationship between VCTs and nodes to cope with the impact of potential network node failures on the function and performance of the control system is established. By equating the mapping relationship adjustment process to an external square wave pulse disturbance, the stability of the system under changing the mapping relationship is analyzed. In the scheme, the wireless network itself acts as a dynamic distributed controller, instead of using a particular core node to execute the control task, the distributed design of the controller and the dynamic mapping relationship above enhance the flexibility and the reliability of the control system. The digital simulation analysis is carried out in the MATLAB/Simulink environment, the results demonstrate the availability and effectiveness of the proposed scheme.

摘要

提出一种软件定义控制系统（software defined control system，SDCS），它是一种基于全连通群的全分布式控制器方案，其特点是控制任务被虚拟化为多个虚拟控制任务（virtual control tasks，VCTs）后分布在无线网络中具有计算和存储功能的节点上。无线网络的拓扑结构本质上是不稳定的，通过构建可迁移节点集，在虚拟控制任务和节点之间建立动态映射关系，以应对潜在的节点故障对控制系统功能和性能的影响。将映射关系调整过程等效为外部方波脉冲扰动，分析了节点故障引起的映射关系的改变对系统稳态和动态性能的影响。所提方案中无线网络充当一个动态的分布式控制器，而非使用某一特定核心节点执行控制任务，上述控制器分布式设计以及动态映射关系提升了控制系统的灵活性和可靠性。最后在MATLAB/Simulink中进行了仿真分析，结果显示了所提方案的可用性及有效性。