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Networked teleoperation with haptic feedback is a prime example for the emerging Tactile Internet, which requires a careful orchestration of haptic communication and control. One major challenge in this context is how to maximize the user's quality-of-experience (QoE) while ensuring at the same time the stability of the global control loop in the presence of communication delay. In this paper, we...
Nanogrids are the building blocks of a microgrid which is powering a single building. Low voltage DC distribution system within building structures is called a LVDC nanogrid. DC electronic loads like LED Lights, BLDC fans, PC, battery system and renewable sources can be connected to the nanogrid. LVDC nanogrid is a low power DC distribution system suitable for residential applications with an efficient...
This paper proposes a new control sharing technique for parallel three-phase inverters in an islanded microgrid. The new control technique combining the adaptive impedance controller and the communication among the parallel inverters to accurately share real power and reactive power when there is a distinct difference between line impedances and the loads change in the microgrid. In this technique,...
Industry 4.0 is a new concept that has emerged from the use of new technologies, which brings great improvements to industries. Consequently, several challenges have been launched for this new concept to become consolidated and will become an industry standard. Software Defined Networking (SDN) is a technology that comes with a proposal of flexibility and agility for the communication networks, which...
Routing in dynamically changing node location scenarios is quite challenging and time consuming. The emerging wireless communication networks such as LTE advanced and 5G, device-to-device communications present such dynamically changing node locations. In mobile ad hoc networks, very often we come across such dynamically changing node location scenarios. In the Internet of things (IoTs), we will come...
Flow-based inspection is playing an important role in network security monitoring systems such as intrusion detection, attacks detection and so on. Traditional flow scheduling strategies are usually based on calculated hash values of input flows which is fixed for a long time. As the bandwidth grows dramatically these years, it is observed that servers handling flow inspections may be crashed due...
Future energy systems depend on a corresponding Information and Communication Technology (ICT) overlay, allowing timely transmission of critical grid information in particular in case of failures or other unanticipated events. Therefore, to maintain grid stability, Smart Grid communication networks are required to be highly reliable and real-time capable. Within this paper, we propose and evaluate...
We consider sampled-data relay control of semilinear diffusion PDEs. Several control signals, subject to unknown bounded disturbances, enter the system through shape functions. The only information required for calculating the control signal is the sign of a weighted average of the state. First, for a nonlinearity from an arbitrary sector, we derive LMI-based conditions that determine how many controllers...
The communication network overlaying the power grid is required to be resilient to link failures among network devices. The Software Defined Networking (SDN) architecture provides a fast-failover mechanism for provisioning networks that are seamlessly resilient. However, in order to guarantee that an SDN meets such resiliency requirements, its control-plane state needs to analyzed and validated against...
In the recent past, there has been an exponential increase in data intensive services over the communication networks. This trend would sustain in future communication networks as well, especially in the Wi-Fi networks. This could be attributed to rapid growth of business and institutional entities and the need for cellular data off-loading for which localized Wi-Fi networks are preferred due to higher...
In this paper, the consensus problem for linear multi-agent systems subject to non-uniform time-varying communication delays and jointly connected switching networks is investigated. Both distributed dynamic state feedback control law and distributed dynamic output feedback control law are proposed. By establishing some technical lemmas, it is shown that the proposed distributed control laws can solve...
This paper presents a control scheme for transmission networks by using load-side controllers which cooperate with automatic generation control (AGC) to restore the power system frequency. A switched consensus-based distributed controller is designed for each load bus in the transmission network. Once the frequency exceeds a pre-selected threshold, each load-side controller will start to discover...
This paper presents a distributed control strategy with situation-dependent communication for disturbance attenuation in physically interconnected systems by output feedback. To avoid large control errors, the local controllers transmit information to the other local controllers, if the influence of the local disturbance on the coupling input to their corresponding subsystem exceeds a given bound...
This paper studies the cooperative global robust output regulation problem for a class of heterogeneous second-order nonlinear uncertain multi-agent systems with jointly connected switching network. We first generalize the result of the adaptive distributed observer from undirected switching networks to directed switching networks, and then solve the problem by a dynamic distributed state feedback...
During the past few decades, networked systems have gained increasing attention and a wider range of applications have been found in areas such as industrial control and signal processing. This paper provides a brief survey of recent results on control and filtering for networked systems. In-depth analysis and discussion is first made on networked control and event-triggered control, where existing...
In this paper, a novel consensus-based distributed nonlinear hierarchical control approach is proposed for frequency and voltage regulation of an islanded AC microgrid under switching communication network. It is proved that the proposed control approach is robust against unreliable communication links as long as the switching graph associated with the communication network satisfies the jointly connected...
The complexity of modern communication networks and innovative cyber-attacking methods make it difficult to automatically detect and prevent attacks. Software-Defined Networking (SDN) separates the forwarding of network traffic from the decision plane of the network and offers a central and programmable interface for the configuration of the network. In this paper, a novel approach to integrate end-to-end...
In today's era of communication, a company's brand is driven by more than the combination of promises made and promises kept for customer satisfaction to gain popularity of brand name. A telecommunications service provider's survival depends on its ability to prepare for changes in customer needs, as well as changes in regulation and technology. But the increasing expectations of customers and the...
The design and performance evaluation of an inhomogeneous dielectric flat lens with the effective relative permittivity cylindrically distributed is presented. In order to achieve high-data rate wireless communications for future broadband networks at millimeter-wave frequencies it is essential to dispose of high directive antennas with beam-steering capabilities. In consequence, in this paper we...
A finite time current observer based adaptive backstepping control strategy is proposed for the output voltage regulation of buck type DC-DC converters. The proposed current observer is designed by utilizing only the output voltage information to reconstruct the inductor current profile while achieving an adaptive control by means of backstepping procedure. This method eliminates the usage of extra...
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