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Early Component-Based Reliability Assessment Using Uml Based Software Models, William Black Smith V
Early Component-Based Reliability Assessment Using Uml Based Software Models, William Black Smith V
Graduate Theses, Dissertations, and Problem Reports
In the last decade, software has grown in complexity and size, while development timelines have diminished. As a result, component-based software engineering is becoming routine. Component-based software reliability assessment combines the architecture of the system with the reliability of the components to obtain the system reliability. This allows developers to produce a reliable system and testers to focus on the vulnerable areas.;This thesis discusses a tool developed to implement the methodology previously created for early reliability assessment of component-based systems. The tool, Early Component-based Reliability Assessment (ECRA), uses Rational Rose Unified Modeling Language (UML) diagrams to predict the reliability of …
Operating Market Based Regulation Service Using Software Agents Compliant With Nerc's Control Performance Standards, Ramanujam Srinivasan
Operating Market Based Regulation Service Using Software Agents Compliant With Nerc's Control Performance Standards, Ramanujam Srinivasan
Graduate Theses, Dissertations, and Problem Reports
With the changing scenario for procurement of energy it becomes necessary to understand the process of obtaining energy from a diverse set of suppliers capable of providing substantial amounts of electric power at competitive prices. Sufficient insight has been gained in the energy brokerage system design and planning owing to experiences in the recently established markets especially the California market. It becomes contextual to analyze and understand the procurement of ancillary services, which are generally bundled as part of the wholesale energy supply chain, using a similarly competitive environment having a number of players that provide electric power for such …
Modeling And Dynamic Stability Of Distributed Generations, Zhixin Miao
Modeling And Dynamic Stability Of Distributed Generations, Zhixin Miao
Graduate Theses, Dissertations, and Problem Reports
The objective of this dissertation is to develop dynamic models for distributed generations (DG), to investigate their impacts on dynamic stability of power distribution systems, and to design controllers for DGs to improve the dynamic stability of the integrated power distribution system.;A two-year distributed generation (DG) project at West Virginia University (WVU) evaluated the impact of various DG sources on actual distribution systems by performing computer simulations. The data is supplied by two regional electric utilities of two actual distribution systems each. In this project several important issues were investigated, including the availability of simulation tools and impacts of DGs …
Telecommunications For A Deregulated Power Industry, Biju Naduvathuparambil
Telecommunications For A Deregulated Power Industry, Biju Naduvathuparambil
Graduate Theses, Dissertations, and Problem Reports
Telecommunication plays a very important role in the effective monitoring and control of the power grid. Deregulation of the US power industry has enabled utilities to explore various communication options and advanced technologies. Utilities are increasingly investing in distributed resources, dynamic real-time monitoring, automated meter reading, and value added services like home energy management systems and broadband access for its customers. Telecommunication options like power line communications (PLC) and satellites are fast replacing legacy telephone and microwave systems in the US.;The objective of this thesis is to study the communication options that are available for utilities today. Phasor measurement units …
Integrated Through -Wafer Optical Monitoring Of Mems For Closed -Loop Control, Jeremy Michael Dawson
Integrated Through -Wafer Optical Monitoring Of Mems For Closed -Loop Control, Jeremy Michael Dawson
Graduate Theses, Dissertations, and Problem Reports
Current trends in many microelectronic systems show an increased use of microelectromechanical systems (MEMS) to perform a variety of tasks. The increased market for MEMS has led to microsystem technologies being employed in physically demanding environments and safety critical applications. This creates the need for higher degrees of certainty in MEMS operation, especially in systems that contain drive components operating under time varying load conditions. Situations such as these give rise to the need for detailed knowledge of the operational states of MEMS over the lifetime of the device, as well as device fault detection. Accurately obtaining this information by …
Design Of A Prototype Personal Static Var Compensator, Scott Alan Zemerick
Design Of A Prototype Personal Static Var Compensator, Scott Alan Zemerick
Graduate Theses, Dissertations, and Problem Reports
The focus of this thesis is the design and implementation of a personal static var compensator (PSVC) for distributed var control through load power factor correction. The PSVC demonstrates the two key benefits of power factor correction, which include decreased power costs and increased system capacity. The PSVC prototype consists of two types of branches---a TSC branch and a TCR branch. A microprocessor is responsible for calculating the load displacement power factor (PFD) and for executing the fuzzy logic control scheme for the two branches. The PSVC was found to reduce the RMS current drawn by a 55-watt AC motor …
Tone Classification Of Syllable -Segmented Thai Speech Based On Multilayer Perceptron, Nuttavudh Satravaha
Tone Classification Of Syllable -Segmented Thai Speech Based On Multilayer Perceptron, Nuttavudh Satravaha
Graduate Theses, Dissertations, and Problem Reports
Thai is a monosyllabic and tonal language. Thai makes use of tone to convey lexical information about the meaning of a syllable. Thai has five distinctive tones and each tone is well represented by a single F0 contour pattern. In general, a Thai syllable with a different tone has a different lexical meaning. Thus, to completely recognize a spoken Thai syllable, a speech recognition system has not only to recognize a base syllable but also to correctly identify a tone. Hence, tone classification of Thai speech is an essential part of a Thai speech recognition system.;In this study, a tone …
Pulse Charging Lead-Acid Batteries To Improve Performance And Reverse The Effects Of Sulfation, Robert B. Cooper
Pulse Charging Lead-Acid Batteries To Improve Performance And Reverse The Effects Of Sulfation, Robert B. Cooper
Graduate Theses, Dissertations, and Problem Reports
When lead-acid batteries are improperly charged or discharged, useful power delivered to loads diminishes. One cause for this is a phenomenon generally referred to as sulfation. One possible method that has been proposed by many to reverse the effects of sulfation is to recharge the lead-acid battery using a pulse charger. To gain a better understanding of the possible benefits of this type of charging, a pulse charger/discharger was constructed. Cycle testing was then done on six pairs of batteries to compare the pulse charged batteries to conventional full-wave rectifier charged batteries. The results of the tests showed that pulse …
Electrical Impedance Of Methane Flat Flame, Jeffrey William Rinker
Electrical Impedance Of Methane Flat Flame, Jeffrey William Rinker
Graduate Theses, Dissertations, and Problem Reports
As part of an ongoing effort to improve emissions and increase efficiency of natural gas fired turbines, this work was undertaken to determine if electrical impedance measurements of the flame are a direct indication of fuel/air ratio. Previous worked measured electrical resistance of the combustion of gases in an atmospheric combustor. From this work, it was conjectured that the complex impedance might provide more information about the flame than using pure resistance. This thesis discusses the measurement of the complex electrical impedance of a Methane Flat Flame Burner. The data shows a relationship between the magnitude of the impedance and …
Analysis And Robust Decentralized Control Of Power Systems Using Facts Devices, Karl E. Schoder
Analysis And Robust Decentralized Control Of Power Systems Using Facts Devices, Karl E. Schoder
Graduate Theses, Dissertations, and Problem Reports
Today's changing electric power systems create a growing need for flexible, reliable, fast responding, and accurate answers to questions of analysis, simulation, and design in the fields of electric power generation, transmission, distribution, and consumption. The Flexible Alternating Current Transmission Systems (FACTS) technology program utilizes power electronics components to replace conventional mechanical elements yielding increased flexibility in controlling the electric power system. Benefits include decreased response times and improved overall dynamic system behavior. FACTS devices allow the design of new control strategies, e.g., independent control of active and reactive power flows, which were not realizable a decade ago. However, FACTS …
Parameter Identification Of Induction Motor Using A Genetic Algorithm, Edina Bajrektarevic
Parameter Identification Of Induction Motor Using A Genetic Algorithm, Edina Bajrektarevic
Graduate Theses, Dissertations, and Problem Reports
High performance variable-speed machines incorporate a model for the system in either the controller or state estimation stages. The accuracy and general robustness of the machine is dependant on this model. Therefore, it must accurately represent both the electrical and electromagnetic interactions within the machine and associated mechanical systems. Recently, some new technologies have been tested in the field of electromechanics like neural networks, fuzzy logic, simulated annealing and genetic algorithms. These methods are increasingly being utilized in solving electric machine problems.;In this thesis, a genetic algorithm (GA)---a form of artificial intelligence---is employed to identify the electric parameters of induction …