Control Of Communication Networks Research Articles

Stability of distributed MPC in an intersection scenario

The research topic of autonomous cars and the communication among them has attained much attention in the last years and is developing quickly. Among others, this research area spans fields such as image recognition, mathematical control theory, communication networks, and sensor fusion. We consider an intersection scenario where we divide the shared road space in different cells. These cells form a grid. The cars are modelled as an autonomous multi-agent system based on the Distributed Model Predictive Control algorithm (DMPC). We prove that the overall system reaches stability using Optimal Control for each multi-agent and demonstrate that by numerical results.

English

Modern supervisory control and data acquisition (SCADA) systems comprise variety of industrial equipment such as physical control processes, logical control systems, communication networks, computers, and communication protocols. They are concerned with control and supervision of production control processes. Modern SCADA networks contain highly distributed information, control, and location. Moreover, they contain large number of heterogeneous components situated in highly changing and uncertain environments. As a result, engineering modern SCADA is a challenging issue and conventional engineering approaches are no longer suitable for them because of their increasing complexity and highly distribution. In this research, Multi-Agent Systems (MAS) are used to enable building adaptive agent-based SCADA system by modeling system components as agents in the micro level and as organizations or societies of agents in the macro level. A prototype has been implemented and evaluated within a simulation environment for demonstrating the adaptive behavior of the system-to-be, which results in continuous improvement of system performance.

The Study of PID AQM Algorithm for FPGA Implementation

This paper proposes a kind of project which is about FPGA (the Field Programmable Gate Array, FPGA) hardware implementation scheme for PID AQM algorithm. According to the analyses of the relatively mature discrete PID algorithm, we realized PID algorithm by using the combination of LPM (Library of Parameter Modules) macro module and Verilog code in FPGA. In this article, we write the program of serial communication to achieve data communication of FPGA with the router (Ipcop), and we use the interface to connect PID algorithm and FPGA serial communication module, the purpose of which is to achieve the control of PID algorithm to control network communication data flow. This article uses FPGA to reduce the consumption of router by achieving PID AQM algorithm, which can improve the algorithm's speed of execution and the real time performance.

Boolean Networks-Based Auction Algorithm for Task Assignment of Multiple UAVs

This paper presents an application of Boolean networks-based auction algorithm (BNAA) for task assignment in unmanned aerial vehicles (UAVs) systems. Under reasonable assumptions, the assignment framework consists of mission control system, communication network, and ground control station. As the improved algorithm of consensus-based bundle algorithm (CBBA), the BNAA utilizes a cluster-based combinatorial auction policy to handle multiple tasks. Instead of empirical method based on look-up table about conditional variables, Boolean network is introduced into consensus routine of BNAA for solving the conflict of assignment across the fleet of UAVs. As a new mathematic theory, semitensor product provides the implementation and theoretical proof of Boolean networks. Numerical results demonstrate the effectiveness and efficiency of proposed BNAA method.

A Survey of GSM Technology to Control Remote Devices

This work describes the different design and implementation of a GSM based remote systems. All existing systems either use GSM or GPRS technologies; however, GSM is the basic way of communication. Due to global GSM roaming facility and good network capability, there is virtually no requirement to build additional network. GSM based SMS services are very cheap and affordable; therefore transmission of data based on SMS in real-time applications has become very popular. GPRS data transmission speed is much faster than normal text message, approx 28 to 32 SMS per/min may be achieve over GPRS. This study explores different tools and technique being used to control communication network through SMS. We also critically review the merit and demerit of various existing solutions. The results of the study are reported in this paper.

Satellite Handover Techniques for LEO Networks Serving Air Traffic Control Communication

Satellite systems are a perfect alternative system to cover wide areas on the earth, especially oceans and desert areas, and to provide broadband communications to all aircraft. Low earth orbit (LEO) satellite constellations are important in future air traffic control (ATC) communication networks due to their advantages, such as whole global coverage and low propagation time. However, the satellites are not stationary; a contact between aircraft and satellite may be subjected to handovers. Many techniques have been proposed in order to deal with the cell handover issue. In this paper, the Handover procedure implication in the communication blocking probability is estimated via simulation. To reduce the high number of Handovers, some strategies are used to cope with. Simulation models have been developed to improve all the features evaluated in this paper.

Distributed dissipative model predictive control for process networks with imperfect communication

Results are developed to ensure stability of a dissipative distributed model predictive controller in the case of structured or arbitrary failure of the controller communication network; bounded errors in the communication may similarly be handled. Stability and minimum performance of the process network is ensured by placing a dissipative trajectory constraint on each controller. This allows for the interaction effects between units to be captured in the dissipativity properties of each process, and thus, accounted for by choosing suitable dissipativity constraints for each controller. This approach is enabled by the use of quadratic difference forms as supply rates, which capture detailed dynamic system information. A case study is presented to illustrate the results. © 2014 American Institute of Chemical Engineers AIChE J, 60: 1682–1699, 2014

Synchronization control for a class of tele-operation system with stochastically time-varying communication delays

Synchronization control methods for a class of tele-operation system with stochastically time-varying communication delays are surveyed, aiming at the existing communication delays, packet loss, and so on, during the ground-based tele-operation of unmanned aerial vehicles. A control model for this class of master-slave tele-operation system with communication time delays is established. Then, the time delays within the remote control communication network are depicted by a time-varying-delay function, of which the modal parameters are transferred based on an ergodic Markov process. After that, the synchronization control problem of the system is solved by stability analysis of the mean square within the framework of the stochastic systems. Finally, the semi-physical simulation platforms of an unmanned micro-quadrotor are carried out to verify the methods presented in this paper; and the elementary simulation results show that the loci of the master-slave sides are all bounded through designing the controllers by the feedback linearization separately in the methods.

Co-simulation platforms for co-design of networked control systems: An overview

This paper gives an overview of the existing co-simulation platforms for co-design of networked control systems (NCSs). NCSs contain coupled control and communication perspectives. However, the existing simulators focus either on control systems or communication networks. In order to analyse the coupling effect from both sides, co-simulation method is under consideration as one of the most promising solutions. This paper briefly introduces the commonly used individual control and communication simulators. Then the existing co-simulation platforms have been reviewed and discussed. Synchronization technique is the key point toward co-simulation, thus different synchronization methods have also been summarized. Two sample case studies with results are provided to show the beneficial of co-simulations.

Secondary control of microgrids based on distributed cooperative control of multi‐agent systems

This study proposes a secondary voltage and frequency control scheme based on the distributed cooperative control of multi-agent systems. The proposed secondary control is implemented through a communication network with one-way communication links. The required communication network is modelled by a directed graph (digraph). The proposed secondary control is fully distributed such that each distributed generator only requires its own information and the information of its neighbours on the communication digraph. Thus, the requirements for a central controller and complex communication network are obviated, and the system reliability is improved. The simulation results verify the effectiveness of the proposed secondary control for a microgrid test system.

Distributed Cooperative Secondary Control of Microgrids Using Feedback Linearization

This paper proposes a secondary voltage control of microgrids based on the distributed cooperative control of multi-agent systems. The proposed secondary control is fully distributed; each distributed generator only requires its own information and the information of some neighbors. The distributed structure obviates the requirements for a central controller and complex communication network which, in turn, improves the system reliability. Input-output feedback linearization is used to convert the secondary voltage control to a linear second-order tracker synchronization problem. The control parameters can be tuned to obtain a desired response speed. The effectiveness of the proposed control methodology is verified by the simulation of a microgrid test system.

Reliable Wireless Communication Networks for Demand Response Control

This paper presents methodologies for deriving reliability performance of wireless communication networks to support demand response (DR) control. First, the impact of communication impairments on a direct DR control program is investigated. Second, the outage probability of a wireless link is modelled and quantified, considering the multipath fading, shadowing, and random path loss given the location distribution of smart meters. Third, the distributions of packet delivery ratio are derived for two wireless network architectures: the single-hop infrastructure-based network and the multi-hop mesh network. Simulation results verify the above reliability models and provide important insights on the coverage of wireless communication networks considering the reliability requirements of DR programs.

A Proposal for an Active Cord-Like Searching System

This research aims to develop a mobile system with long-thinned cord-like structure for searching and inspection tasks in confined deep space. The system is designed to provide certain mobility capability, localization ability, and flexibility in system composition to adapt to the searching environments. A simple new Active Joint Mechanism is introduced to meet long-thinned cord-like requirements, with its complete kinematic analysis provided. Active- and passive-segmentalization and hybrid train structure for the system are proposed to enable the adjustment of mobility capability, internal sensor based localization ability, and variable-length composition of the system. A realization on a prototype system with a multimodal searching sensor mounted, communication networks for motion control and sensor information embedded, and user interface provided, is presented.

Autonomous Application Recovery in Distributed Intelligent Automation and Control Systems

Over the past decade, a clear trend toward distributed automation in industrial systems was observable. This means that applications are executed at heterogeneous control devices and communication networks. One of the main drivers of this development was the availability of cheap computing and communication resources. Moreover, a strong market demand for operation and adaptation of automation and control services with no downtime is also often requested. As a result, appropriate approaches recovering and (re)configuring automation and control devices as well as even their services and functions during full operation are needed. The relatively new standard IEC 61499 “Function Blocks” provides a reference model for the development and implementation of distributed industrial process measurement and control systems (IPMCSs). It provides a scalable and open architecture to model distributed automation and control applications. The high-level goals of IEC 61499 can be summarized as interoperability, (re)configurability, and portability of distributed applications for IPMCS. Therefore, it provides a very good basis for dynamic (re)configuration and recovery of applications and status information in heterogeneous IPMCS and may master some of the shortcomings of present-day systems. The main purpose of this paper is to present and discuss a general concept for autonomous recovery of applications within the context of distributed automation and control systems which has been implemented using the IEC 61499 reference model.

The FlexRay Implementation of By-Wire System for Electric Vehicle

In the recent years, advanced technologies of electronic devices for the communication and computer engineering have been considered to be widely implemented in the vehicle systems. Among those possible applications, the automotive network which is so-called “X-by-Wire” scheme has been developed for steering control and braking control of the vehicles. It is known that the weight reduction of vehicle systems can decrease the power consumption in the design of electric driven vehicle by replacing the mechanical components with electronic devices. Therefore, X-by-wire system combined with fault-tolerant applications will be a trend in the automotive industry. Under the automotive circumstance, the timetrigged protocol improves the network capacity and guarantees the transmission of all safety related message. In order to ensure the safety of electronic devices, an advanced networking protocol FlexRay has been recently proposed to the design of X-by-wire system. In this paper, such an X-by-wire mechanism is developed for electric vehicle. The proposed design covers the development of a hub wheel motor driven electric vehicle and the design of both electronic control braking module and communication network. For facilitating the application usage, a FlexRay communication node is developed by using microprocessor chip Freescale MC9S12XF512. An electric vehicle is also designed by using four hub wheel type AC motors with DC motor driven braking mechanism for system testing and performance evaluation. A timescheduling scheme is proposed and configured for each of nine FlexRay nodes to fulfil the tasks of driveby- wire and brake-by-wire operations. Experimental results demonstrate the success of the proposed design.

Control System of Automotive Transmission Test Line Based on PLC and HMI

Utomotive Transmission Test Line Is One of Sub-lines of Automotive Transmission Assembly Line Used for Testing the Quality of Assembly. some Automotive Transmission Enterprise Is Taken as Research Content and Application Background. this Paper Puts Forward a Control System of Automotive Transmission Test Line Based on Wincc Flexible and S7-300PLC.Here Contents Including Program Planning, Supervisory System Developing, Control System Programming and Communication Network Configuring Are Shown. by Using RFID Information Collection of the Online Products Is Achieved. Besides, Remote Data Acquisition and Processing Is Carried Out by Using Profibus-DP. the Control System Represents Advantages such as Good Interface, Well-staged Control Program, Satisfactory Stability and High Quality of Automation.

Development of the Control System and Communication Network for Intelligent SF6 High Voltage Circuit-Breaker

This paper analyses the cause of the major faults of the SF6 high voltage circuit breaker, and then introduces a solution using an embedded control system. The control system consists of the controller for every breaker and a supervisor control system in the control center. Then a double-annular fiber field-bus communication network for the control system is introduced, of which the data link layer is implemented by the CAN controller. According to the operation state of every node and the fiber, the fiber communication module of every node can be configured to several different transmission modes. Due to the influence of temperature, the empirical formula of Beattie-Bridgman is used to calculate the pressure of SF6.

Control Network Communication for Pipeline Welding Based on CANopen

Automatic welding has been used frequently on offshore pipeline projects. The productivity and reliability are most essential features of the automatic welding system. In older to satisfy the requirements of all-position welding process that welding system can weld with mated welding parameters at any position, a master-slave CAN-bus network control welding system is constructed, which is composed of CAN-bus master and slave based on CANopen communication. Welding generator, digital servo drives considered as slave are successfully integrated in all-position pipeline welding system. By means of automation device specification based on PC control to deploy equipmental Objects Dictionary, it can ensures the real-time and fast transmission of process data objects by using synchronous object transmission. Soft PLC and Configuration software founded on window technology can realize welding process data transmission and monitoring. The test result shows that the control system is reliable and exchangeable by being tested in scene, and the welding process data are openly and transparently transferred.

Power line communication networks for large-scale control and automation systems

Power line communications uses the existing power line infrastructure for communication purposes. While the majority of recent contributions have discussed PLC for high-data-rate applications like Internet access or multimedia communication serving a relatively small number of users, in this article we are concerned with PLC as an enabler for sensing, control, and automation in large systems comprising tens or even hundreds of components spread over relatively wide areas. Typical examples of such systems are energy management (Smart Grid) and facility automation systems. We provide a discussion of the communication network requirements common to such systems and present transmission concepts for PLC to make use of the existing infrastructure resources (i.e., power lines) to meet these requirements.

An Integrated Modeling Framework for Exploring Network Reconfiguration of Distributed Controlled Homogenous Power Inverter Network using Composite Lyapunov Function Based Reachability Bound

We describe an integrated modeling framework for an interactive power network (IPN) consisting of a power network (PN) and a wireless communication network (WCN). The PN is modeled using a set of piecewise linear (PWL) equations. The WCN is modeled using a Markov chain-based model that can capture the randomness of the communication channel. The impacts of the WCN are incorporated into the PN models using variable time delays. By formulating a convex optimization problem based on a composite Lyapunov function and solving this problem using linear matrix inequality solvers, we predict the reaching criteria for orbital existence. We investigate the impacts of time delays due to the wireless network and communication channel disruptions on the reachability bound, mean square stability, and performance of the IPN. Subsequently, using the integrated modeling framework, we demonstrate the efficacy of a scheme to jointly optimize control performance and network resource utilization. We demonstrate how communication fault tolerant protocols can be implemented to ensure that the IPNs operate within their reachability and performance bounds, despite one or more disruptions in the communication channels. We further demonstrate that when the WCN is clustered due to communication disruptions, each cluster can optimize its control communication network.