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View the PDF document Network virtualization based framework for smart grid communication
Author: Dipakbhai, Patel Janki
Institution: University of the South Pacific.
Award: M.Sc.
Subject: Smart power gridsComputer networks, Virtual computer systems
Date: 2016
Call No.: pac TK 3105 .D57 2016
BRN: 1209541
Copyright:Under 10% of this thesis may be copied without the authors written permission

Abstract: With a specific end goal to control and deal with the framework, information exchange is basic in smart grid. Optical fibers are broadly utilized as a part of transmission grid and substations to give high-capacity and high-reliability communications. Notwithstanding, because of high cost and firmness, it is uneconomical and inelastic to format optical fibers in the middle of substations and terminal devices to give the lastmile availability. Wireless mesh network (WMN) is suitable network for distribution grid communication as a result of its comfort in organization and its extended scope through wireless multi-hop connections. Power line communication (PLC) is another suitable candidate, since it does not need additional base. In any case, bothWMN and PLC connections are lossy connections which have a tendency to experience the ill effects of bit error and pocket loss because of interference and attenuation. It is greatly hard to ensure the reliability of real-time services in such systems. Network virtualization (NV) is a promising innovation to bolster customized end-to-end execution of different administrations. In this study, a NV-based structure is proposed for smart grid communication. In the system, real-time services are upheld by virtual networks (VNs) that are mapped to two physical systems at the same time, i.e., WMN and PLC system. To ensure the characteristics of real-time services, diverse VNs ought to be kept free and ought not to interfere with one another. In order to granularly allocate resources to VNs, orthogonal frequency division multiple access used as the multiple access schemes for WMN. Simultaneous transmissions in numerous subcarriers bring the advantage of additional diversity. The upgraded transmission diversity qualities through the two networks, i.e. WMN and PLC and the assigned sub-carriers add to the reliability guarantee of the real-time services. Since the VN mapping and subcarrier task issue is nondeterministic polynomial-time hard, a heuristic arrangement is created to take care of the issue efficiently and effectively. To reduce the complexity of the system, an algorithm of data sparsification is applied on the input of the system. The input data samples are divided into the 8×1 data blocks. Data sparsity can be achieved by forcing some elements of the data blocks to be valued as zero. According to the algorithm, maximum sparsity is achieved by considering the CPI (Cumulative Point Index) values i.e. first component of the spectrum pertaining to v each data block. Here in the algorithm the only value of the data blocks that is remaining as it is will be the CPI of the data block. Discrete Ratio Transform (DRT) is applied to each data block and DRT spectrum is obtained. Sparsing is carried out by forcing all seven data elements in a data block other than the CPI value to the value 0. This reduced CPI sequence is stored instead of the original data. The results with the data sparsification and the results without the data saprsification are compared in the proposed work. Simulation results uncover the sufficiency of our proposed methodology.
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