The International Journal of Electrical Engineering & Education, 1985
Composite insulation for a power cable A relationship is derived for the voltage of a power cable... more Composite insulation for a power cable A relationship is derived for the voltage of a power cable containing three different insulating materials, allowing for a safety factor in the withstand voltage of each insulator layer and assuming that the electric fields in the dielectrics do not exceed a prescribed maximum. This relationship has been used in a design project for power cable using multilayer insulation.
2020 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2020
Resilience, as a concept, has been recently become a strategic objective for power grids. However... more Resilience, as a concept, has been recently become a strategic objective for power grids. However, there are still some conceptual unclarities. Resilience is often mistakenly used as a synonym for reliability. A power system can be reliable but not resilient. This paper clarifies this misconception. It discusses resilience definitions, cycle, and states to better understand resilience aspects. It also discusses power grids' new vulnerabilities and sheds the light on both cyber-physical resilience and cyber contingency concepts. Finally, it reviews the strategies used to enhance grid resilience.
This article presents analysis of the systems in a Fuel Cell Electric Vehicle (FCEV) prototype wi... more This article presents analysis of the systems in a Fuel Cell Electric Vehicle (FCEV) prototype with the aim of determining if it is possible to increase vehicle efficiency through strategic control of the auxiliary systems. To accomplish this, an overview of the vehicle design is given as well as an in depth analysis of the powertrain efficiency and control strategy. This leads to the development of a modified powertrain control algorithm which also oversees and controls the auxiliary power demand in real-time. The auxiliary control aspect of this algorithm follows predefined rules as determined through analysis of the individual systems, and based on the definitions of flexible useful and wasteful auxiliary power. The simulation results show that the proposed technique, applied to FCEV air conditioning system alone, improves the fuel economy in the neighborhood of 3.4% compared to conventional bang-bang controller. This magnitude of energy reduction is very significant in the automotive industry, especially when considering the number of vehicles in use in today's transportation sector. The resulting algorithm is adaptable to a number of different types of auxiliary systems and primary power sources, thereby not specifically tied to the fuel cell architecture for which it is developed.
Abstract Modeling wind generation for use in reliability assessment requires a large database of ... more Abstract Modeling wind generation for use in reliability assessment requires a large database of historical wind speeds so that the stochastic nature of the wind at a particular site can be accurately captured. The alternative is to use reliable stochastic simulation techniques that can replicate the desired synthetic wind power time series. This paper proposes an assessment framework that uses a Markov chain Monte Carlo (MCMC) method to enable the inclusion of wind farm modeling in conventional techniques for evaluating generation adequacy. The synthetic wind power time series based on the MCMC model has been verified against measured results based on consideration of statistical factors. The model presented in this paper has also been applied on the well-known Roy Billiton Test System (RBTS). As a further demonstration of the effectiveness of the proposed methodology, the reliability indices obtained using the MCMC model have been compared with those produced by the ARMA model, which is often used in reliability studies. The results indicate the effectiveness of the proposed technique for incorporating wind power into generation adequacy evaluation.
IEEE Power Engineering Society General Meeting, 2005
Abstract—This paper studies the D-STATCOM allocation problem to mitigate the voltage fluctuation ... more Abstract—This paper studies the D-STATCOM allocation problem to mitigate the voltage fluctuation on the distribution system and the effect of the distributed generation on the proper location and the economical size. The mathematical formulation of the problem is presented. The ...
Smart grids have been emerging nowadays as an initiative to operate modern distribution systems i... more Smart grids have been emerging nowadays as an initiative to operate modern distribution systems in a more economic and efficient way. Energy storage systems (ESSs) are one of the promising technologies that can achieve the goals of smart grids via facilitating the connection of renewable sources, improving system reliability, and controlling the net demand through peak load shaving, etc. In this paper, a comprehensive planning framework is introduced for ascertaining the most cost effective siting and sizing of ESSs that maximize their benefits in distribution networks. A probabilistic approach is further adopted that includes the consideration of the stochastic nature of system components. Such approach allows determining the optimal operation of ESS at each load state. Moreover, contingency planning decisions, in the form of load points to be shed during contingencies, are identified through the approach proposed.
Journal of the Egyptian Society of Parasitology, 2004
Six Giardia lamblia strains (4 from Egypt, one from the USA and one from Sudan) were used to stud... more Six Giardia lamblia strains (4 from Egypt, one from the USA and one from Sudan) were used to study the phenotypic and genotypic variation in some Egyptian G. lamblia strains compared to other G. lamblia strains, which may be responsible for the difference in their behavioral characteristics. By using SDS-PAGE for antigenic study, E1 strain appeared different from the rest of the strains with two bands; one at 121 Kda and the other at 34 Kda which were not present in other strains, while bands at 130 and 43 Kda were present in all strains but absent in E1 strain. Another difference between E1 strain and the rest of the strains was obtained by CAE, using PGM enzyme where E1 strain gave a different zymodeme than the other strains. Based on the computerized RAPD- PCR analysis, 4 rapdemes were identified; rapdeme 1 contained E1 strain, rapdeme 2 contained E2, E3 and E4 isolates, rapdeme 3 contained Sudan strain and rapdeme 4 contained USA strain. In conclusion this study revealed diversi...
The International Journal of Electrical Engineering & Education, 1985
Composite insulation for a power cable A relationship is derived for the voltage of a power cable... more Composite insulation for a power cable A relationship is derived for the voltage of a power cable containing three different insulating materials, allowing for a safety factor in the withstand voltage of each insulator layer and assuming that the electric fields in the dielectrics do not exceed a prescribed maximum. This relationship has been used in a design project for power cable using multilayer insulation.
2020 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 2020
Resilience, as a concept, has been recently become a strategic objective for power grids. However... more Resilience, as a concept, has been recently become a strategic objective for power grids. However, there are still some conceptual unclarities. Resilience is often mistakenly used as a synonym for reliability. A power system can be reliable but not resilient. This paper clarifies this misconception. It discusses resilience definitions, cycle, and states to better understand resilience aspects. It also discusses power grids' new vulnerabilities and sheds the light on both cyber-physical resilience and cyber contingency concepts. Finally, it reviews the strategies used to enhance grid resilience.
This article presents analysis of the systems in a Fuel Cell Electric Vehicle (FCEV) prototype wi... more This article presents analysis of the systems in a Fuel Cell Electric Vehicle (FCEV) prototype with the aim of determining if it is possible to increase vehicle efficiency through strategic control of the auxiliary systems. To accomplish this, an overview of the vehicle design is given as well as an in depth analysis of the powertrain efficiency and control strategy. This leads to the development of a modified powertrain control algorithm which also oversees and controls the auxiliary power demand in real-time. The auxiliary control aspect of this algorithm follows predefined rules as determined through analysis of the individual systems, and based on the definitions of flexible useful and wasteful auxiliary power. The simulation results show that the proposed technique, applied to FCEV air conditioning system alone, improves the fuel economy in the neighborhood of 3.4% compared to conventional bang-bang controller. This magnitude of energy reduction is very significant in the automotive industry, especially when considering the number of vehicles in use in today's transportation sector. The resulting algorithm is adaptable to a number of different types of auxiliary systems and primary power sources, thereby not specifically tied to the fuel cell architecture for which it is developed.
Abstract Modeling wind generation for use in reliability assessment requires a large database of ... more Abstract Modeling wind generation for use in reliability assessment requires a large database of historical wind speeds so that the stochastic nature of the wind at a particular site can be accurately captured. The alternative is to use reliable stochastic simulation techniques that can replicate the desired synthetic wind power time series. This paper proposes an assessment framework that uses a Markov chain Monte Carlo (MCMC) method to enable the inclusion of wind farm modeling in conventional techniques for evaluating generation adequacy. The synthetic wind power time series based on the MCMC model has been verified against measured results based on consideration of statistical factors. The model presented in this paper has also been applied on the well-known Roy Billiton Test System (RBTS). As a further demonstration of the effectiveness of the proposed methodology, the reliability indices obtained using the MCMC model have been compared with those produced by the ARMA model, which is often used in reliability studies. The results indicate the effectiveness of the proposed technique for incorporating wind power into generation adequacy evaluation.
IEEE Power Engineering Society General Meeting, 2005
Abstract—This paper studies the D-STATCOM allocation problem to mitigate the voltage fluctuation ... more Abstract—This paper studies the D-STATCOM allocation problem to mitigate the voltage fluctuation on the distribution system and the effect of the distributed generation on the proper location and the economical size. The mathematical formulation of the problem is presented. The ...
Smart grids have been emerging nowadays as an initiative to operate modern distribution systems i... more Smart grids have been emerging nowadays as an initiative to operate modern distribution systems in a more economic and efficient way. Energy storage systems (ESSs) are one of the promising technologies that can achieve the goals of smart grids via facilitating the connection of renewable sources, improving system reliability, and controlling the net demand through peak load shaving, etc. In this paper, a comprehensive planning framework is introduced for ascertaining the most cost effective siting and sizing of ESSs that maximize their benefits in distribution networks. A probabilistic approach is further adopted that includes the consideration of the stochastic nature of system components. Such approach allows determining the optimal operation of ESS at each load state. Moreover, contingency planning decisions, in the form of load points to be shed during contingencies, are identified through the approach proposed.
Journal of the Egyptian Society of Parasitology, 2004
Six Giardia lamblia strains (4 from Egypt, one from the USA and one from Sudan) were used to stud... more Six Giardia lamblia strains (4 from Egypt, one from the USA and one from Sudan) were used to study the phenotypic and genotypic variation in some Egyptian G. lamblia strains compared to other G. lamblia strains, which may be responsible for the difference in their behavioral characteristics. By using SDS-PAGE for antigenic study, E1 strain appeared different from the rest of the strains with two bands; one at 121 Kda and the other at 34 Kda which were not present in other strains, while bands at 130 and 43 Kda were present in all strains but absent in E1 strain. Another difference between E1 strain and the rest of the strains was obtained by CAE, using PGM enzyme where E1 strain gave a different zymodeme than the other strains. Based on the computerized RAPD- PCR analysis, 4 rapdemes were identified; rapdeme 1 contained E1 strain, rapdeme 2 contained E2, E3 and E4 isolates, rapdeme 3 contained Sudan strain and rapdeme 4 contained USA strain. In conclusion this study revealed diversi...
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