Browsing by Author "Şahin, Dilan"

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    Quality of service-based (QoS-Based) routing for smart grid applications
    (Bahçeşehir Üniversitesi Fen Bilimleri Enstitüsü, 2012-06) Şahin, Dilan; Güngör, Çağrı
    Recently, the increasingly growing population and diminishing power resources have threatened the electric utilities in generating and distributing the necessary electricity and forced them finding new ways to generate the electricity with renewable energy resources. The imbalance between power demand and supply is one of the problems of the electric utilities, since generating electricity more than the actual necessity may result in huge electricity lost due to the non-existence of the advanced electricity storage options. In addition to the imbalance between power demand and supply, the equipment failures and the lack of comprehensive monitoring and control capabilities are other important signs to take incremental steps for switching to a smarter power grid with effective communication, automation and monitoring skills. This new concept is conceived as smart grid, which is a modern power grid system with advanced communication, monitoring, sensing and control capabilities. In general, smart grid is a distributed system that many of its components are spread over a wide range of area. Thus, a reliable communication and coordination between distributed components of the smart grid is required for the safety and reliability of the power delivery system. To this end, effective management and reliable operation of smart grid can be achieved with the installation of wireless sensor nodes on the critical power grid equipment. In these systems, collected sensor data can be used to diagnose arising problems quickly, and hence, system breakdowns due to the cascading effect initiated by a single fault in the power grids can be prevented. The main objective of this thesis is to analyze the behavior of a multi-path and multispeed (MMSPEED) routing protocol in different line-of-sight (LOS) and non-line-ofsight (NLOS) smart power grid environments, e.g., 500kV outdoor substation, main power control room and underground network transformer vaults. MMSPEED routing protocol is a novel packet routing mechanism that guarantees QoS provisioning in two quality domains, e.g., reliability and timeliness domains. It provides several packet delivery options for timeliness domain and probabilistic multi-path forwarding for reliability domain. Furthermore, a comparison has been made for multi-path and single-path routing algorithms to see the performance for achieving service differentiation in different smart grid environment which has harsh environmental conditions that posse additional challenges for WSN technology to provide reliability and latency requirements. Hence, the wireless channel should be modelled by taking account multiple parameters that can affect the signal quality. Since log-normal shadowing model takes into account both fading and distance affects in the surrounding of transmitters and receivers, it is the preferred propagation model in this thesis. From the extensive simulations, the presented algorithm provides a clear service differentiation in smart grid environments.