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This paper propose an asynchronous impulsive control scheme for consensus of second-order multi-agent systems. The proposed control scheme do not require time synchronization among agents. Each agents has its won clock to determine the impulsive instants. By using discretization approaches and the stochastic matrix theory, it is find that the stability of the proposed control scheme depends on the...
DC-DC converters with high dynamic performance and low current ripple, able to drive highly fluctuating loads are nowadays required in a range of applications (e.g. accelerators, plasma research, fusion reactors). In order to fulfill the requirements of these applications, advanced current control concepts have to be employed to harness the full potential of the designed topology. In this paper, an...
In recent years, wireless power transfer (WPT) technology has developed rapidly. In order to control power transmission and optimize efficiency, a large number of control methods have been proposed. Due to the unique inherent characteristics of the WPT system, the various control methods are faced to three challenges. First, transmission efficiency is significantly affected by the change in output...
This paper proposes a fixed frequency based sliding mode (SM) controller for transformer-less single phase inverter for photovoltaic (PV) application with active power decoupling minimizing the capacitance requirement. Unlike conventional power decoupling techniques in full bridge converters, the proposed technique incorporates a large sinusoidal swing of the half-bridge capacitor voltages and a limited...
This paper develops an alternate arm converter (AAC) high-voltage direct current (HVDC) terminal model that is compatible with the existing benchmark models of modular multilevel converter (MMC) based HVDC and dc-grid benchmark models. The developed model is a first step towards an AAC-based point-to-point transmission system and the future development of multi-converter, multiterminal benchmark models...
In this paper reactive power compensation using an infinite level inverter based STATCOM is proposed. Nowadays, the society is becoming increasingly dependent on the electrical supply. New equipment's are more sensitive to power quality variations. This causes the transmission line to transfer equal or sometimes more than its capacity, which leads to overloading, voltage fluctuations etc. in the system...
In this paper, we develop a system to support learning of OpenFlow by visually associating controller configuration information and logical topology. In our system, the constructed topology is visually shown on a touchscreen display and a learner can easily confirm the topology. In addition, a learner can configure the controller by visual and simple operation using the touchscreen display. Therefore,...
This paper proposes a Current Deadbeat Control (DBC) algorithm for a three-phase 9-cells qZS based Cascaded H-Bridge (CHB) inverter to ensure grid current supply with low THD. The studied topology is considered as a single-stage DC/AC topology having the capability of boosting the DC input voltage with high-quality multilevel AC voltage, independent DC-link voltage compensation, and control of the...
In Software Defined Networking (SDN), connections between the controller and the switches are maintained in two ways: out-of-band and in-band. In out-of-band controlling, the control channels are constructed via separate links. However, due to several reasons, sometimes in-band controlling is needed instead of out-of-band controlling. In in-band controlling, the data paths are used for control channels...
Software Defined Networks split the data plane from the control plane. They can be used in wireless networks and will bring flexibility, less interference, simple management, less energy consumption and load balancing. They can also improve service quality, handover and mobility between different service providers. In previous methods, when link states were changed the controller deleted the stored...
Continuous-review inventory control problem in goods distribution networks is addressed from a control-theoretic perspective. In contrast to the earlier works concentrating on the fundamental serial and parallel-path configurations, a multi-echelon mesh topology network of suppliers, distribution centers, and retailers is considered. The external, uncertain demand may be imposed on any node in the...
In this paper, a surrounding control problem for second-order agent system is investigated. A set of followers composed by the second-order agent networks is applied to surround a team of static leaders into a convex hull spanned by these followers. The problem is considered under a decentralized estimation-and-control framework by using tools from algebraic graph theory and Lyapunov stable theory...
Software Defined Networking (SDN) is rapidly gaining acceptance and use in terrestrial networks but little research has been done to apply it to aerial networks. This paper describes an investigation into five open-source controllers using a specific set of criteria based on the characteristics of these networks. A preliminary qualitative investigation compares the controllers based on their state...
This paper proposes a robust model predictive control approach to address the optimized adaptive tracking consensus problem for multi-vehicle systems with periodic sampling under the directed communication topology. Unlike the existing works using the global information to achieve the tracking consensus, the proposed optimized tracking cooperative control strategy considers that the control gain is...
This paper considers the antagonistic formation problem of second-order multi-agent systems with addictive noises and multiplicative noises over directed signed graph. Firstly, a distributed protocol is proposed, and a time-varying consensus gain is introduced to attenuate the effect of communication noises. Then, by using the tools of matrix theory and stochastic differential equation, the necessary...
Photovoltaic energy storage system meets the ever-growing demand for electricity, while ensuring the stability of power supply. Research of renewable energy-based microgrid system has become a hot topic, especially the study of Maximum Power Point Tracking (MPPT) and energy storage unit control strategies. This paper proposes an MPPT technique that combines gradient step size with conductance increment...
Average-consensus filter problem is investigated for a mixed-order multi-agent system, which consists of first-order and second-order agents, and the proportional-integral consensus filter algorithms are proposed for the agents with different constant inputs. Based on generalized Nyquist stability criterion, sufficient convergence conditions are obtained for the multiagent system under a fixed, symmetric...
This paper proposes a three-phase six-inductor double-switch PFC circuit which is suitable for high frequency UPS application. This PFC circuit not only achieves high power factor correction in grid-connected mode of UPS, but also improves bus voltage in battery mode of UPS. This new PFC removes the independent boost design in common UPS and the whole cost can be reduced. The topology structure and...
Software-Defined Networking (SDN) is an emerging technology that supports recent network applications. An SDN redefines networks by introducing the concept of decoupling the control plane from the data plane, thus providing centralized management, programmability, and dynamic reconfiguration. In this research, we specifically investigate the significance of using SDNs in support of Big-Data applications...
Artificial Lift systems are routinely employed in the petroleum industry in order to provide the energy needed for the fluid to be transferred from the reservoir to the surface. The ESP system is a method of artificial lift widely used in recovery, often applied in mature fields or fields with heavy oil (low API gravity), as well as high flow rate wells. The energy for ESP systems is supplied by a...
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