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The Intel® Omni-Path Architecture (Intel® OPA) is designed to enable a broad class of computations requiring scalable, tightly coupled CPU, memory, and storage resources. Integration between devices in the Intel® OPA family and Intel® CPUs enable improvements in system level packaging and network efficiency. When coupled with the new user-focused open standard APIs developed by the OpenFabrics Alliance...
This work presents an intelligent acoustic methodology for detection of defective porcelain station post insulators, which are widely used in substations in the form of column presenting several sheds. The acoustic emission inspection aims to detect cracks or fissures in a particular shed, which will have its insulating capacity severely decreased, if cracked. The test is done by gently striking the...
Power electronics applications to electric power processing are playing an increasingly indispensable role in the power quality and power reliability enhancement, especially in view of the growing importance of distributed (especially renewable) energy sources' contribution to electric power generation. Grid-interactive distributed generation systems have huge potential to significantly enhance the...
Exhaustive enumeration of a S-select-k problem for hypothesized substations outages can be practically infeasible due to exponential growth of combinations as both S and k numbers increase. This enumeration of worst-case substations scenarios from the large set, however, can be improved based on the initial selection sets with the root nodes and segments. In this paper, the previous work of the reverse...
Our work evaluates the use of software-defined networking (SDN) for reliable communication. Reliable communication has become an important topic in many areas, including energy communication networks or, more generally, automation control networks. Electrical grids are developing into smart grids, which depend heavily on reliability, robustness and optimized resource usage. On the other side, the...
In an all-electric ship, a high level of service continuity to equipment loads is of paramount importance to both mission success and personnel well-being. The objective of this paper is to investigate the reliability improvements obtained due to the design of a three-dimensional shipboard power distribution system (SPS). Several three-dimensional architectures are designed based on the following...
This paper presents a novel unidirectional DC/DC converter that can be used to transfer power from distributed resources such as Solar PV or Fuel Cells into a DC microgrid. The converter is based on the LLC topology but designed to operate in a specific region of the gain curve that provides several benefits to integration of renewable energy sources into a constant DC bus. The isolated converter...
In recent years, the penetration of renewable resources in electrical power systems has increased. These renewable resources add more complexities to power system operations, due to their intermittent nature. As a result, operators must acquire additional reserves in order to maintain reliability. However, one persistent challenge is to determine the optimal location and quantity of reserves; this...
The reserve grid is a redundant MV grid, which serves as an emergency power system (EPS). It is designed to compensate interruptions of the MV grid or substations by offering an independent connection to an additional substation. The challenge is to find the optimal topology regarding costs and reliability. The locations of the customers and the substation have to be considered in the planning of...
Recent advances in cooperative driving hold the potential to significantly improve safety, comfort and efficiency on our roads. Platooning of heavy vehicles, where automated or semi-automated driving allows minimal inter-vehicle gaps, has shown considerable reductions in fuel consumption. Although using the same wireless communication technology, a platoon differs from a VANET (Vehicular Ad-hoc NETwork)...
As process interruptions can be very expensive, reliability and availability values of a variable frequency drive (VFD) are often two of the most important requirements when selecting a drive. Reliability figures are hard to compare because methods and values depend on suppliers using different assumptions and definitions of failures. The main medium voltage VSI (voltage source inverter) topologies...
In this paper we present a fault tolerant Mesh based Network-on-Chip design that helps to tolerate router faults along with core recovery mechanism. Spare links are used to provide a connection to horizontal and vertical routers pivoting the failed one. To compliment the modified topology a routing algorithm has been developed that uses minimal and non minimal paths to communicate between source and...
Wireless Sensor Networks (WSNs) have become increasingly popular in recent years for controlling systems where human intervention is undesirable or impossible. There is no fixed or planned infrastructure for WSNs. Therefore, Virtual Backbone (VB) is currently used to support topology control, efficient routing and broadcast communication in WSNs. A Connected Dominating Set (CDS) is a promising candidate...
Facing computational complexity when modeling network reliability by means of parametric models and corresponding statistical methods, in the present study, we apply nonparametric statistical methods, such as the Kaplan-Meier survival probability estimator and the mean cumulative function, to characterize the dynamic properties (in particular, the stability properties) of the Internet routing paths...
Dual inverter open winding drive (DIOWD) has several advantages over standard 3 phase drive such as multilevel voltage output, lower dc link voltage, high efficiency and better fault tolerant capability. In this paper three DIOWD topologies aiming for high speed and/or safety critical applications are evaluated. Their operation characteristics, VA ratings, efficiencies, harmonic distortion factors...
To improve reliability and performance of Software Defined Networking (SDN) architectures, a number of recent efforts have proposed a logically centralized but physically distributed controller design that overcomes the bottleneck introduced by a single physical controller. Despite these advances, two key problems still persist. First, the task of controlling the host network and the task of controlling...
This paper discusses a technique to implement Remedial Action Schemes (RAS) or Special Protection Systems (SPS) for Variable Transfer Limits (VTL) computation. Need for RAS implementation for VTL calculations are discussed. The technique presented can be applied to the bus/branch model as well as for the node/breaker model. Advantages of using the State Estimator cases for VTL calculations are discussed...
This paper evaluates the Depth First Forwarding (DFF) protocol — a reliable data forwarding mechanism for use in low power, lossy networks. Routing protocols used for lossy networks typically take time to converge if the topology changes, during which data failure may occur. DFF was proposed to help reduce this; it reacts to data delivery failures at a node by trying to successfully deliver the packet...
An increasing number of ships are being integrated with electric propulsion systems and a significant proportion of these require variable frequency drives in the multi-megawatt range. At such large power, medium voltage AC (MVAC) drive offers numerous advantages over low voltage AC (LVAC) solution. This paper examines the state-of-the art MV drives and their development trends for marine applications...
Energy consumption in wireless sensor network is of paramount importance, which is demonstrated by large number of algorithms, techniques and protocols that have been developed to save energy and to extend lifetime. In WSN for mission critical application two performance metrics are: reliability and energy efficiency. In literature CDS based technique is used to achieve reliability. CDs allow communication...
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