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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Preserving Consumer Privacy on IEEE 802.11s-Based Smart Grid AMI Networks

Beussink, Andrew 01 May 2014 (has links)
While the newly envisioned smart grid will result in a more efficient and reliable power grid, its use of fine-grained meter data has widely raised concerns of consumer privacy. This thesis implements a data obfuscation approach to preserve consumer privacy and assesses its feasibility on a large-scale advanced metering infrastructure (AMI) network built upon the new IEEE 802.11s wireless mesh standard. This obfuscation approach preserves consumer privacy from eavesdroppers and the utility companies while preserving the utility companies' ability to use the fine-grained meter data for state estimation. The impact of this privacy approach is assessed based on its impact on data throughput and delay performance. Simulation results have shown that the approach is feasible to be used even when the network size grows. Additional adaptations to the approach are analyzed for their feasibility in further research.
2

The feasibility of implementing advanced metering technology in high income areas in South Africa

Mwangi, Mburu January 2017 (has links)
Water is an important natural resource and a building block to all life on earth. However, substantial increase in water demand and consumption has led to numerous nations, including South Africa, to face water scarcity. Improved water demand management strategies and water monitoring approaches are imperative. In South Africa, it's a legal requirement for all water supply points to be metered. Currently, water flow is primarily measured by conventional meters. However, substantial developments have been noted in the last two decades where conventional meters with added capabilities (such as communication capabilities) added have been introduced. These meters are known as advanced water meters. These capabilities offer functions such as leakage detection and more immediate consumption feedback. However, advanced meters also have significant disadvantages such as require high start-up capital and are susceptible to higher failure rates than conventional meters. It remains to be seen if advanced metering technology is an appropriate technology to be adopted in South Africa. Due to the different dynamics of South Africa's income level groups, the metering application and effects will differ for each income level group. Therefore, the purpose of this study is to investigate the feasibility of implementing advanced metering systems in high income areas in South Africa. An evaluation framework was developed to gauge the viability of implementing advanced metering systems on four performance criteria; technical, economic, environmental and social. The composite indicator framework template was selected as it was not tailor made for a specific reason and could be adapted for this research. The necessary framework input parameter data were acquired from practitioners in the field through questionnaires and from literature. Due to lack of advanced metering case studies in South Africa (except for prepaid meter), literature from developed countries were used as proxies. The input data entailed details of the current metering system, advanced metering system and new conventional metering system with the later used as a control for comparative purposes. The typical high-income scenario was derived from typical input data. For each input parameter, there were value ranges from the low parameter value to high parameter value. These ranges were used to conduct the sensitivity analysis on the framework to access critical input parameters to the success or failure of implementation Implementing advanced metering systems in high income areas in South Africa was found to be less economically viable than conventional meters. This is due to the lack of needed infrastructure for advanced metering as well as high initial capital costs and high operating costs. Advanced meters however proved to be more environmentally viable than conventional meters as they offered higher reduction in consumption. However, the manner in which faulty batteries are disposed could lead to environmental damage. Social factors were considered negligible for high income areas as revolts to introduction to new meters arises from financial constraints that those meters might induce. Further research with more South Africa based case studies and smaller scale advanced metering systems has been recommended.
3

Privacy-Preserving Protocols for IEEE 802.11s-based Smart Grid Advanced Metering Infrastructure Networks

Tonyali, Samet 01 January 2018 (has links)
The ongoing Smart Grid (SG) initiative proposes several modifications to the existing power grid in order to better manage power demands, reduce CO2 emissions and ensure reliability through several new applications. One part of the SG initiative that is currently being implemented is the Advanced Metering Infrastructure (AMI) which provides two-way communication between the utility company and the consumers' smart meters (SMs). The AMI can be built by using a wireless mesh network which enables multi-hop communication of SMs. The AMI network enables collection of fine-grained power consumption data at frequent intervals. Such a fine-grained level poses several privacy concerns for the consumers. Eavesdroppers can capture data packets and analyze them by means of load monitoring techniques to make inferences about household activities. To prevent this, in this dissertation, we proposed several privacy-preserving protocols for the IEEE 802.11s-based AMI network, which are based on data obfuscation, fully homomorphic encryption and secure multiparty computation. Simulation results have shown that the performance of the protocols degrades as the network grows. To overcome this problem, we presented a scalable simulation framework for the evaluation of IEEE 802.11s-based AMI applications. We proposed several modifications and parameter adjustments for the network protocols being used. In addition, we integrated the Constrained Application Protocol (CoAP) into the protocol stack and proposed five novel retransmission timeout calculation functions for the CoAP in order to increase its reliability. Upon work showing that there are inconsistencies between the simulator and a testbed, we built an IEEE 802.11s- and ZigBee-based AMI testbed and measured the performance of the proposed protocols under various conditions. The testbed is accessible to the educator and researchers for the experimentation. Finally, we addressed the problem of updating SMs remotely to keep the AMI network up-to-date. To this end, we developed two secure and reliable multicast-over-broadcast protocols by making use of ciphertext-policy attribute based signcryption and random linear network coding.
4

Uma proposta de arquitetura extensível para micro medição em Smart Appliances

Torri, Lucas Bortolaso January 2012 (has links)
O sistema de energia atual passou por poucas alterações desde sua concepção original, há mais de 100 anos. No entanto, a crescente complexidade da infraestrutura e da demanda global por energia vem criando diversos desafios que a sua constituição original não previa, culminando em problemas como apagões e outras falhas no seu fornecimento. Além disso, nota-se nos últimos anos, principalmente nos países desenvolvidos, uma certa diversificação na matriz energética, incentivando a utilização de fontes de energia renováveis e distribuídas. Isto se deve não apenas ao potencial energético das, mas também visando uma menor utilização de combustíveis fósseis, devido tanto a volatilidade e tendência de alta dos preços do petróleo, mas também pela necessidade de contenção do volume de emissões de gases causadores do efeito estufa. Apesar desta defasagem do sistema de energia contemporâneo, avanços nas áreas de informática, eletrônica embarcada, além das tecnologias empregadas na construção de sensores e atuadores, têm possibilitado a criação de uma rede de energia moderna, automatizada e distribuída. Esta rede, conhecida como Mart Grid, traz novas perspectivas no gerenciamento e na operação dos sistemas de geração, transmissão e distribuição de energia elétrica, inserindo propostas que visam melhorar diversos fatores da rede de energia atual, aumentado sua eficiência, segurança e confiabilidade de transmissão, além da eliminação de obstáculos para a integração em larga escala de fontes de energia distribuídas e renováveis. Este novo paradigma é caracterizado por um fluxo bidirecional de eletricidade e de informações, afim de criar uma rede automatizada e distribuída de energia. Ele incorpora à grade os benefícios da computação distribuída e de comunicações para fornecer informações em tempo real e permitir o equilíbrio quase instantâneo da oferta e da procura dos bens energéticos. Dentro do contexto de Smart Grids, Smart Appliances são uma modernização dos aparelhos eletrodomésticos quanto a sua utilização de energia, de forma que estes sejam capazes de monitorar, proteger e ajustar automaticamente o seu funcionamento às necessidades do proprietário e a disponibilidade deste recurso. Ou seja, estes possuem não apenas características de inteligência, mas também a capacidade de utilizarem as informações disponibilizados no Smart Grid para adaptar seu funcionamento. Apesar do grande interesse despertado em torno destes conceitos, há ainda uma enorme carência de padrões e tecnologias que permitam a criação de tais aparelhos inteligentes inseridos nos ambientes domésticos e prediais. Este trabalho tem por objetivo estudar e conceituar o Smart Grid, pesquisando os grupos existentes que buscam uma padronização deste, bem como conceituar Smart Appliances, avaliando projetos e pesquisas existentes, e, principalmente, propondo uma arquitetura que permita a construção de tais dispositivos. Os requisitos necessários para a criação desta arquitetura são discutidos ao longo da dissertação, bem como as tecnologias necessárias e existentes para permitir sua proposta. Finalmente, o funcionamento bem sucedido, através de uma implementação da mesma, é demonstrado através de diferentes experimentos, avaliando como as características do Smart Grid podem ser utilizadas para criar aparelhos eletrodomésticos capazes de usarem as informações disponíveis para melhorar seu funcionamento. / Since its original conception, for over 100 years, the current energy system has experienced little changes. However, the increasing complexity of the infrastructure, together with the growing global demand for energy, have imposed many challenges that its original constitution did not foresee, which has resulted in problems such as blackouts along with other energy supply failures. Moreover, over the last few years, some diversification in energy generation has been seen, especially in developed countries, encouraging the use of distributed and renewable energy sources. Apart from the energetic potential offered by those sources, it aims to decrease the greenhouse gases emission volume, in addition to reduce dependency on fossil fuels, which tend to increase in price. Despite the lack of upgrades, improvements in the areas of computing, embedded electronics, and technologies employed in sensors and actuators assembly have enabled the creation of a modern automated and distributed power grid. This grid, better known as Smart Grid, enhances several factors of the current power network, bringing new perspectives in electricity management, operation, generation, transmission and distribution. That result in increased efficiency, transmission safety and reliability, additionally eliminating obstacles in large-scale integration of renewable and distributed energy sources. This new paradigm also features a bi-directional electricity and information flow, enabling an automated and distributed energy network that incorporates the grid benefits of distributed computing and communications to provide real-time information and allowing almost instantaneous supply and demand balance of energy goods. Within the context of Smart Grids, Smart Appliances proposes an extension of regular appliances with intelligence and self-awareness of their energy use, so that they are able to monitor, protect and automatically adjust its operation according to the owner's needs and availability of this resource. That is, besides of being smart, they feature ability to use the information available on the Smart Grid to adapt its running behavior. Even though the increased interest around these concepts, there is still a gap of standards and technologies enabling the creation and embedding of intelligent devices in residences and buildings. The present projects attempts to study and conceptualize Smart Grid, surveying existing standardization groups, as well as conceptualize Smart Appliances, evaluating existing projects and research, proposing an architecture allowing the building of such devices. The requirements for this architecture, together with the required and existing technologies to make the implementation feasible, are discussed throughout the project development. Finally, the architecture's successful functioning is demonstrated through an implementation of it, together with different experiments, relying on them to evaluate the Smart Grid characteristics and how appliances can improve their operation based on the information shared throughout the Smart Grid.
5

Uma proposta de arquitetura extensível para micro medição em Smart Appliances

Torri, Lucas Bortolaso January 2012 (has links)
O sistema de energia atual passou por poucas alterações desde sua concepção original, há mais de 100 anos. No entanto, a crescente complexidade da infraestrutura e da demanda global por energia vem criando diversos desafios que a sua constituição original não previa, culminando em problemas como apagões e outras falhas no seu fornecimento. Além disso, nota-se nos últimos anos, principalmente nos países desenvolvidos, uma certa diversificação na matriz energética, incentivando a utilização de fontes de energia renováveis e distribuídas. Isto se deve não apenas ao potencial energético das, mas também visando uma menor utilização de combustíveis fósseis, devido tanto a volatilidade e tendência de alta dos preços do petróleo, mas também pela necessidade de contenção do volume de emissões de gases causadores do efeito estufa. Apesar desta defasagem do sistema de energia contemporâneo, avanços nas áreas de informática, eletrônica embarcada, além das tecnologias empregadas na construção de sensores e atuadores, têm possibilitado a criação de uma rede de energia moderna, automatizada e distribuída. Esta rede, conhecida como Mart Grid, traz novas perspectivas no gerenciamento e na operação dos sistemas de geração, transmissão e distribuição de energia elétrica, inserindo propostas que visam melhorar diversos fatores da rede de energia atual, aumentado sua eficiência, segurança e confiabilidade de transmissão, além da eliminação de obstáculos para a integração em larga escala de fontes de energia distribuídas e renováveis. Este novo paradigma é caracterizado por um fluxo bidirecional de eletricidade e de informações, afim de criar uma rede automatizada e distribuída de energia. Ele incorpora à grade os benefícios da computação distribuída e de comunicações para fornecer informações em tempo real e permitir o equilíbrio quase instantâneo da oferta e da procura dos bens energéticos. Dentro do contexto de Smart Grids, Smart Appliances são uma modernização dos aparelhos eletrodomésticos quanto a sua utilização de energia, de forma que estes sejam capazes de monitorar, proteger e ajustar automaticamente o seu funcionamento às necessidades do proprietário e a disponibilidade deste recurso. Ou seja, estes possuem não apenas características de inteligência, mas também a capacidade de utilizarem as informações disponibilizados no Smart Grid para adaptar seu funcionamento. Apesar do grande interesse despertado em torno destes conceitos, há ainda uma enorme carência de padrões e tecnologias que permitam a criação de tais aparelhos inteligentes inseridos nos ambientes domésticos e prediais. Este trabalho tem por objetivo estudar e conceituar o Smart Grid, pesquisando os grupos existentes que buscam uma padronização deste, bem como conceituar Smart Appliances, avaliando projetos e pesquisas existentes, e, principalmente, propondo uma arquitetura que permita a construção de tais dispositivos. Os requisitos necessários para a criação desta arquitetura são discutidos ao longo da dissertação, bem como as tecnologias necessárias e existentes para permitir sua proposta. Finalmente, o funcionamento bem sucedido, através de uma implementação da mesma, é demonstrado através de diferentes experimentos, avaliando como as características do Smart Grid podem ser utilizadas para criar aparelhos eletrodomésticos capazes de usarem as informações disponíveis para melhorar seu funcionamento. / Since its original conception, for over 100 years, the current energy system has experienced little changes. However, the increasing complexity of the infrastructure, together with the growing global demand for energy, have imposed many challenges that its original constitution did not foresee, which has resulted in problems such as blackouts along with other energy supply failures. Moreover, over the last few years, some diversification in energy generation has been seen, especially in developed countries, encouraging the use of distributed and renewable energy sources. Apart from the energetic potential offered by those sources, it aims to decrease the greenhouse gases emission volume, in addition to reduce dependency on fossil fuels, which tend to increase in price. Despite the lack of upgrades, improvements in the areas of computing, embedded electronics, and technologies employed in sensors and actuators assembly have enabled the creation of a modern automated and distributed power grid. This grid, better known as Smart Grid, enhances several factors of the current power network, bringing new perspectives in electricity management, operation, generation, transmission and distribution. That result in increased efficiency, transmission safety and reliability, additionally eliminating obstacles in large-scale integration of renewable and distributed energy sources. This new paradigm also features a bi-directional electricity and information flow, enabling an automated and distributed energy network that incorporates the grid benefits of distributed computing and communications to provide real-time information and allowing almost instantaneous supply and demand balance of energy goods. Within the context of Smart Grids, Smart Appliances proposes an extension of regular appliances with intelligence and self-awareness of their energy use, so that they are able to monitor, protect and automatically adjust its operation according to the owner's needs and availability of this resource. That is, besides of being smart, they feature ability to use the information available on the Smart Grid to adapt its running behavior. Even though the increased interest around these concepts, there is still a gap of standards and technologies enabling the creation and embedding of intelligent devices in residences and buildings. The present projects attempts to study and conceptualize Smart Grid, surveying existing standardization groups, as well as conceptualize Smart Appliances, evaluating existing projects and research, proposing an architecture allowing the building of such devices. The requirements for this architecture, together with the required and existing technologies to make the implementation feasible, are discussed throughout the project development. Finally, the architecture's successful functioning is demonstrated through an implementation of it, together with different experiments, relying on them to evaluate the Smart Grid characteristics and how appliances can improve their operation based on the information shared throughout the Smart Grid.
6

Uma proposta de arquitetura extensível para micro medição em Smart Appliances

Torri, Lucas Bortolaso January 2012 (has links)
O sistema de energia atual passou por poucas alterações desde sua concepção original, há mais de 100 anos. No entanto, a crescente complexidade da infraestrutura e da demanda global por energia vem criando diversos desafios que a sua constituição original não previa, culminando em problemas como apagões e outras falhas no seu fornecimento. Além disso, nota-se nos últimos anos, principalmente nos países desenvolvidos, uma certa diversificação na matriz energética, incentivando a utilização de fontes de energia renováveis e distribuídas. Isto se deve não apenas ao potencial energético das, mas também visando uma menor utilização de combustíveis fósseis, devido tanto a volatilidade e tendência de alta dos preços do petróleo, mas também pela necessidade de contenção do volume de emissões de gases causadores do efeito estufa. Apesar desta defasagem do sistema de energia contemporâneo, avanços nas áreas de informática, eletrônica embarcada, além das tecnologias empregadas na construção de sensores e atuadores, têm possibilitado a criação de uma rede de energia moderna, automatizada e distribuída. Esta rede, conhecida como Mart Grid, traz novas perspectivas no gerenciamento e na operação dos sistemas de geração, transmissão e distribuição de energia elétrica, inserindo propostas que visam melhorar diversos fatores da rede de energia atual, aumentado sua eficiência, segurança e confiabilidade de transmissão, além da eliminação de obstáculos para a integração em larga escala de fontes de energia distribuídas e renováveis. Este novo paradigma é caracterizado por um fluxo bidirecional de eletricidade e de informações, afim de criar uma rede automatizada e distribuída de energia. Ele incorpora à grade os benefícios da computação distribuída e de comunicações para fornecer informações em tempo real e permitir o equilíbrio quase instantâneo da oferta e da procura dos bens energéticos. Dentro do contexto de Smart Grids, Smart Appliances são uma modernização dos aparelhos eletrodomésticos quanto a sua utilização de energia, de forma que estes sejam capazes de monitorar, proteger e ajustar automaticamente o seu funcionamento às necessidades do proprietário e a disponibilidade deste recurso. Ou seja, estes possuem não apenas características de inteligência, mas também a capacidade de utilizarem as informações disponibilizados no Smart Grid para adaptar seu funcionamento. Apesar do grande interesse despertado em torno destes conceitos, há ainda uma enorme carência de padrões e tecnologias que permitam a criação de tais aparelhos inteligentes inseridos nos ambientes domésticos e prediais. Este trabalho tem por objetivo estudar e conceituar o Smart Grid, pesquisando os grupos existentes que buscam uma padronização deste, bem como conceituar Smart Appliances, avaliando projetos e pesquisas existentes, e, principalmente, propondo uma arquitetura que permita a construção de tais dispositivos. Os requisitos necessários para a criação desta arquitetura são discutidos ao longo da dissertação, bem como as tecnologias necessárias e existentes para permitir sua proposta. Finalmente, o funcionamento bem sucedido, através de uma implementação da mesma, é demonstrado através de diferentes experimentos, avaliando como as características do Smart Grid podem ser utilizadas para criar aparelhos eletrodomésticos capazes de usarem as informações disponíveis para melhorar seu funcionamento. / Since its original conception, for over 100 years, the current energy system has experienced little changes. However, the increasing complexity of the infrastructure, together with the growing global demand for energy, have imposed many challenges that its original constitution did not foresee, which has resulted in problems such as blackouts along with other energy supply failures. Moreover, over the last few years, some diversification in energy generation has been seen, especially in developed countries, encouraging the use of distributed and renewable energy sources. Apart from the energetic potential offered by those sources, it aims to decrease the greenhouse gases emission volume, in addition to reduce dependency on fossil fuels, which tend to increase in price. Despite the lack of upgrades, improvements in the areas of computing, embedded electronics, and technologies employed in sensors and actuators assembly have enabled the creation of a modern automated and distributed power grid. This grid, better known as Smart Grid, enhances several factors of the current power network, bringing new perspectives in electricity management, operation, generation, transmission and distribution. That result in increased efficiency, transmission safety and reliability, additionally eliminating obstacles in large-scale integration of renewable and distributed energy sources. This new paradigm also features a bi-directional electricity and information flow, enabling an automated and distributed energy network that incorporates the grid benefits of distributed computing and communications to provide real-time information and allowing almost instantaneous supply and demand balance of energy goods. Within the context of Smart Grids, Smart Appliances proposes an extension of regular appliances with intelligence and self-awareness of their energy use, so that they are able to monitor, protect and automatically adjust its operation according to the owner's needs and availability of this resource. That is, besides of being smart, they feature ability to use the information available on the Smart Grid to adapt its running behavior. Even though the increased interest around these concepts, there is still a gap of standards and technologies enabling the creation and embedding of intelligent devices in residences and buildings. The present projects attempts to study and conceptualize Smart Grid, surveying existing standardization groups, as well as conceptualize Smart Appliances, evaluating existing projects and research, proposing an architecture allowing the building of such devices. The requirements for this architecture, together with the required and existing technologies to make the implementation feasible, are discussed throughout the project development. Finally, the architecture's successful functioning is demonstrated through an implementation of it, together with different experiments, relying on them to evaluate the Smart Grid characteristics and how appliances can improve their operation based on the information shared throughout the Smart Grid.
7

Optimizing the Advanced Metering Infrastructure Architecture in Smart Grid

Chasempour, Alireza 01 May 2016 (has links)
Advanced Metering Infrastructure (AMI) is one of the most important components of smart grid (SG) which aggregates data from smart meters (SMs) and sends the collected data to the utility center (UC) to be analyzed and stored. In traditional centralized AMI architecture, there is one meter data management system to process all gathered information in the UC, therefore, by increasing the number of SMs and their data rates, this architecture is not scalable and able to satisfy SG requirements, e.g., delay and reliability. Since scalability is one of most important characteristics of AMI architecture in SG, we have investigated the scalability of different AMI architectures and proposed a scalable hybrid AMI architecture. We have introduced three performance metrics. Based on these metrics, we formulated each AMI architecture and used a genetic-based algorithm to minimize these metrics for the proposed architecture. We simulated different AMI architectures for five demographic regions and the results proved that our proposed AMI hybrid architecture has a better performance compared with centralized and decentralized AMI architectures and it has a good load and geographic scalability.
8

Hardware-based Authentication and Security for Advanced Metering Infrastructure

Deb Nath, Atul Prasad January 2016 (has links)
No description available.
9

Detection of Back-Fed Ground Faults Using Smart Grid Distribution Technology

January 2014 (has links)
abstract: The safety issue in an electrical power distribution system is of critical importance. In some circumstances, even the continuity of service has to be compromised for a situation that can cause a hazard to the public. A downed conductor that creates an electrical path between a current carrying conductor and ground pose a potential lethal hazard to anyone in the near proximity. Electric utilities have yet to find a fully accepted and reliable method for detecting downed conductors even with decades of research. With the entry of more automation and a smarter grid in the different layers of distribution power system supply, new doors are being opened and new feasible solutions are waiting to be explored. The 'big data' and the infrastructures that are readily accessible through the smart metering system is the base of the work and analysis performed in this thesis. In effect, the new technologies and new solutions are an artifact of the Smart Grid effort which has now reached worldwide dimensions. A solution to problems of overhead distribution conductor failures / faults that use simple methods and that are easy to implement using existing and future distribution management systems is presented. A European type distribution system using three phase supply is utilized as the test bed for the concepts presented. Fault analysis is performed on the primary and the secondary distribution system using the free downloadable software OpenDSS. The outcome is a set of rules that can be implemented either locally or central using a voltage based method. Utilized in the distribution management systems the operators will be given a powerful tool to make the correct action when a situation occurs. The test bed itself is taken from an actual system in Norway. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2014
10

Prices in Wholesale Electricity Markets and Demand Response

Aketi, Venkata Sesha Praneeth 02 June 2014 (has links)
No description available.

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