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This paper considers control of networks modeled by a directional graph. We propose a leader-follower paradigm for coordinating local feedback controllers in a large network of interacting components, where most components - the followers - can handle local load without problems, but where a few heavily loaded components - the leaders - are close to saturation. The leader-follower paradigm partitions...
Frequency regulation in wind-powered islanded microgrids (WPIM) is critical for system stability given unpredictable dynamics from variations in wind generation and demand. Traditional methods of frequency regulation in WPIM have used classical secondary load controllers (CSLC) in a centralized approach to buffer wind generation and demand events. This study investigates the feasibility of using a...
This paper proposes a novel control strategy for smooth transition between stand-alone and grid-connected modes of distributed generation (DG). The proposed control scheme is designed in stationary (α-β) reference frame consisted of outer grid current control loop using a proportional resonant (PR) controller and the inner load voltage control loop developed with a repetitive controller (RC). The...
We discuss our approach to federating dissimilar discrete event simulations, leveraging the strengths and design goals of both, to produce a packet-level detailed network model federated with a component-level detailed input-queuing router model. All existing network simulation tools that we are aware of incorporate a very simplistic model for the flow of packets through a router. The simplistic model...
RT-LAB simulator platform for simulation of switched reluctance machine is described in the paper. Basic circuit block of OP5311 digital input, basic circuit block of OP5312 digital output and the photograph of voltage convert circuit are given. The hardware synchronized simulation models are setup includes period calculation of rotor position pulse signals in phase a, the simulation models of launching...
The increasing penetration of generation power plants based on renewable energies in the electrical networks has boosted the number of systems connected to the grid. In this scenario the microgrid, providing advanced functionalities to improve the stability and operation of the network, have become very popular. In this paper a control strategy for the microgrid management is presented. The proposed...
A decentralized controller for the synchronization of two remote parallel voltage source inverters used to supply train auxiliaries is presented. A modular hybrid dynamic model of the entire power electronic apparatus is constructed; possible unbalanced line and load impedances are also considered. The power sharing between the converters is obtained by designing a droop controller based on local...
The green energy transfer with isolation is used to transfer the energy which can not be used directly to the energy which can be utilized directly. This is achieved via switching control, i.e. duty-cycle control. However, by this way, the low-duty cycle is likely to deteriorate the utilization effectiveness of semiconductor devices and magnetic components. Consequently, to conquer this problem, a...
This paper presents the concept of a voltage controlled pulse skipping modulation (VCPSM) in a dc-dc converter, which improves the efficiency, ripple magnitude, and transient response over a wide range of light load condition. The duty ratio of VCPSM, instead of remaining constant as in a classical PSM, is controlled using the voltage mode control with an additional input voltage feed-forward along...
SystemC is a discrete event simulator that enables the programmer to model complex designs with varying levels of abstraction. In order to improve precision, it can be coupled to more specialized simulators. This article introduces the concept of loose simulator coupling between an analogue simulator and SystemC. It explains the properties and advantages which include a higher simulation performance...
In this paper we propose a set of different configurations of failure recovery schemes, developed for network-on-chip (NoC) based systems. These configurations exploit the fact that communication in NoCs tends to be partitioned and eventually localized. The failure recovery approach is based on checkpoint and rollback and is aimed towards fast recovery from system or application level failures. The...
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