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This paper presents a comparative analysis in detecting bearing faults of a 3-phase induction motor using frequency spectral subtraction of stator current with and without an adaptive filter (Wiener filter). At incipient stage of fault, supremacy of healthy components is a major issue in current based monitoring. To overcome this problem, it is essential to suppress the effect of healthy components...
Maximally recoverable codes are codes designed for distributed storage which combine quick recovery from single node failure and optimal recovery from catastrophic failure. Gopalan et al [SODA 2017] studied the alphabet size needed for such codes in grid topologies and gave a combinatorial characterization for it.Consider a labeling of the edges of the complete bipartite graph K_{n,n} with labels...
Information centric networking (ICN) is one of the emerging Internet paradigms proposed to overcome the shortcoming of the current host-centric Internet. With ubiquitous in-network caching, ICN can facilitate content delivery and reduce network delay. In this paper, we propose a novel collaborative caching scheme based on routers' position to cache popular videos on the edge routers which are closer...
Electric drives of high power applications require power electronic converters of high power rating. To meet this requirement, the multilevel inverter concept has been introduced for medium voltage and high power applications. The multilevel inverter became popular because of its advantages like low harmonic distortion, less rate of change of voltage (dv/dt) and it reduces the bearings stress of a...
A promising approach for dealing with the increasing demand of data traffic is the use of device-to-device (D2D) technologies, in particular when the destination can be reached directly, or though few retransmissions by peer devices. Thus, the cellular network can offload local traffic that is transmitted by an ad hoc network, e.g., a mobile ad hoc network (MANET), or a vehicular ad hoc network (VANET)...
Twitter's data centers process billions of events per day the instant the data is generated. To achieve real-time performance, Twitter has developed Heron, a streaming engine that provides unparalleled performance at large scale. Heron has been recently open-sourced and thus is now accessible to various other organizations. In this paper, we discuss the challenges we faced when transforming Heron...
This paper presents a reconfigurable Many-processor Array utilizing a layer of Routers with localized interconnects to provide fault tolerance for Processing Elements (PEs). In such a system, each PE is assigned to a Router in the neighborhood. The required interconnect topology among the PE's is implemented via a fixed Backbone Network connecting all the Routers. A localized Auxiliary Network is...
A fault tolerant three phase five-level inverter configuration for the application of islanded photovoltaic (PV) systems is proposed. The fault tolerant five-level inverter configuration is achieved by stacking a two-level inverter, a three-level neutral point clamped inverter along with three bidirectional switches. This configuration is fed with two DC sources. The proposed configuration shows fault...
This paper proposes a new approach to calculate optimal firing angles of a Seven-Level Cascaded H-bridge Multilevel Inverter(CHB-MLI) using Gravitational Search Algorithm(GSA). The presence of more levels in the output voltage waveform of MLI introduces large harmonic content which should be reduced. Selective Harmonic Elimination(SHE) method is the popular technique used for eliminating the desired...
This paper proposes a new methodology of firing to increase the number of levels in the output voltage of a conventional seven-level inverter. In a conventional 7-level cascaded H bridge (CHB), by employing a new firing scheme with unequal DC sources, an output waveform of 21-levels has been generated. Thus near sinusoidal waveform has been achieved with the same number of switches. The simulation...
In this paper, a fully differential low voltage folded cascode CMOS low noise amplifier for zig-bee based applications in wireless sensor networks is presented. The noise figure can be reduced by various gain enhancement techniques of folded cascode LNA. By using capacitive cross coupling technique for LNA, enhancement in trans conductance and linearity of common gate topology can be achieved. The...
Integration of power due to distributed renewable energy resources (DRERs) with the existing grid to supply electricity to both industrial and residential users is expected to have a significant impact on the future power system. Power electronic transformer (PET) has emerged as one amongst the promising technologies to achieve such requirement. In this paper, a multi-source fed power electronic transformer...
MTC services are undergoing rapid increase; billions of MTC connections can be anticipated in a few years. When supporting MTC services in telecommunications networks, MTC traffic characteristics and its unique service requirements should be exploited in order to optimize resource utilization and offer satisfactory service quality for all devices. In this paper, we present an Information-Centric Virtual...
Integration of multiple power sources using power electronic converters and high-frequency isolation links to supply the sustainable electricity is expected to have a significant impact on the future power system. In this paper, a triple port active bridge converter (TAB) based multi-fed power electronic transformer (TMF-PET) is proposed. The proposed PET consists of three ports having the flexibility...
MANET is a dynamic network which is used extensively today due to its diverse applications in several fields like military battlefield, disaster relief operations, etc. Since MANET has a mobile topology, the position of every node keeps changing from time to time. Hence, during data transmission, several nodes enter and leave the network. As a result, MANETs are vulnerable to several attacks in which...
A Fuzzy logic controller based Shunt Active Power Filter (SAPF) for Hybrid Renewable sources for Grid-interconnection has been proposed. SAPF is shunted at the Point of Common Coupling (PCC) with the existing power system to have compensation among power quality issues. The proposed converter topology also feeding the Maximum Power from the PV-Arrays and Wind Energy System into the Grid. The advancement...
This paper proposes a three phase seventeen-level inverter for grid-connected photovoltaic systems, with a novel pulse width-modulated (PWM) control scheme. The proposed topology constitutes the conventional three-phase bridge with three bidirectional switches. A multilevel dc link using PV cells and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output...
The non-conventional energy sources like photovoltaic cells and fuel cells will be at a low voltage level, this must be stepped up considerably for DC grid integration, for which we need a high voltage gain DC-DC boost converters. In this paper a multilevel boost converter (MLBC) topology is presented which consists of a simple boost converter and switched capacitor technique to provide high voltage...
This paper presents a controlling approach to improve throughput using cross layer integration. Now a days communication networks require minimal interference and maximum accuracy with a faster data rate. Throughput improvement has become a vital issue in deploying broadband wireless sensor networks. Based on integration of optimum power allocation and memory blockage a novel approach of cross layer...
The Power industry was in demand of a universal global communication standard to enable interoperability and integration between different manufacturers and types of IED, for substation Automation. International Electro-technical Commission (IEC) has developed a global communication standard IEC 61850 to facilitate substation automation. This paper discusses the protocol structure of IEC61850 and...
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