You searched for +publisher:"Virginia Tech" +contributor:("Centeno, Virgilio A.").
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1.
Sherburne, Michael.
Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications.
Degree: BS, Electrical and Computer Engineering, 2018, Virginia Tech
URL: http://hdl.handle.net/10919/83932 
► Field-reversed configuration (FRC) research and pulsed high-energy experiments are in a need of an upgrade. Studying nuclear fusion and obtaining high energy yields for flash…
(more)
▼ Field-reversed configuration (FRC) research and pulsed high-energy experiments are in a need of an upgrade. Studying nuclear fusion and obtaining high energy yields for flash x-ray radiography using plasma or particles can be made easier through faster switches. One newly emerging technology is called the Linear Transformer Driver (LTD). These switches are becoming more commonly used in the solid-state domain. While gas spark gap switches can supply high power, they cannot be turned off when engaged. Solid-state switches on the other hand can, and when integrated into the LTD topology, these switches can operate like their spark gap peers. Even better, solid-state switches can be switched in the sub-nanosecond regime with minimal jitter. With the advent of solid-state LTD technology, fast rise-time high energy applications in nuclear science and plasma physics experiments are possible. This has led to the design and development of a 30kV and 500A solid-state LTD. The designed LTD can achieve a rise-time under 10ns and has a high potential to achieve less than 1ns jitter. This thesis details every aspect of the LTD design process. A novel code has been developed to estimate the feasibility of a variety of solid-state switches and costs. This feasibility code has been shown to have a good correlation with real life prices that it models. A new detailed LTD model has been made as well and shows a strong correlation with other LTD models. The new model also shows voltage transient spiking of the pulsed waveform attributed by the primary inductance of the LTD. Overall, the design tools gathered and made in this thesis will help any engineer developing a solid-state LTD for their application.
Advisors/Committee Members: Adams, Colin S. (committeechair), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Pulsed; Power; Field-Reversed Configuration; Linear Transformer Driver
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APA (6th Edition):
Sherburne, M. (2018). Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications. (Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/83932
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sherburne, Michael. “Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications.” 2018. Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/83932.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sherburne, Michael. “Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications.” 2018. Web. 28 Feb 2020.
Vancouver:
Sherburne M. Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications. [Internet] [Thesis]. Virginia Tech; 2018. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/83932.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sherburne M. Design of a 15MW Solid-State Linear Transformer Driver for Gas Switch Triggering Applications. [Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/83932
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Gupta, Piyush.
Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers.
Degree: MS, Electrical and Computer Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/79820
► Residential solar Photovoltaic (PV) installations are increasing at a very high pace in the United States. In 2017 there are approximately one million residential solar…
(more)
▼ Residential solar Photovoltaic (PV) installations are increasing at a very high pace in the United States. In 2017 there are approximately one million residential solar PV installations in the US. A significant share of these installations are downstream of distribution transformers and thus connected to the secondary. To precisely analyze voltage variations induced by PV systems into distribution systems, accurate models of load and PV systems connected to the secondary side of distribution transformers are required. In the work here we consider two secondary circuit modeling approaches, simple secondary and detailed secondary models. In simple secondary models all loads and all PV generators below a distribution transformer are modeled as an aggregate load and an aggregate PV generator. In the detailed secondary models all loads and PV systems below the distribution transformers are modeled individually and secondary conductors and service drops are also modeled. Using a cloud motion simulator, it is observed that employing the simple secondary models can lead to inaccurate and conservative results. Moreover, the locations with the greatest voltage changes are different in the two modeling approaches. This paper highlights the importance of utilizing detailed secondary models over simple secondary models in analyzing PV generation.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), De La Ree Lopez, Jaime (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Simple Secondary Model; Detailed Secondary Model; Cloud Motion Simulator; Distributed Energy Resources
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APA (6th Edition):
Gupta, P. (2017). Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/79820
Chicago Manual of Style (16th Edition):
Gupta, Piyush. “Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers.” 2017. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/79820.
MLA Handbook (7th Edition):
Gupta, Piyush. “Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers.” 2017. Web. 28 Feb 2020.
Vancouver:
Gupta P. Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/79820.
Council of Science Editors:
Gupta P. Importance of Detailed Modeling of Loads/PV Systems Connected to Secondary of Distribution Transformers. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/79820
3.
Chatterjee, Paroma.
On-line Calibration of Instrument Transformers Using Synchrophasor Measurements.
Degree: MS, Electrical Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/79857
► The world of power systems is ever changing; ever evolving. One such evolution was the advent of Phasor Measurement Units (PMUs). With the introduction of…
(more)
▼ The world of power systems is ever changing; ever evolving. One such evolution was the advent of Phasor Measurement Units (PMUs). With the introduction of PMUs in the field, power system monitoring and control changed for the better. Innovative and efficient algorithms that used synchrophasors came to be written. To make these algorithms robust, it became necessary to remove errors that crept into the power system with time and usage. Thus the process of calibration became essential when practical decisions started being made based on PMU measurements.
In the context of this thesis ‘calibration’ is the method used to estimate a correction factor which, when multiplied with the respective measurement, negates the effect of any errors that might have crept into them due to the instrument transformers located at the inputs of a PMU or the PMU device itself. Though this thesis mainly deals with the calibration of instrument transformers, work has been done previously for calibrating other components of a power system. A brief description of those methods have been provided along with a history on instrument transformer calibration.
Three new methodologies for instrument transformer calibration have been discussed in details in this thesis. The first method describes how only voltage transformers can be calibrated by placing optimal number of good quality voltage measurements at strategic locations in the grid, in presence of ratio errors in the instrument transformers and Gaussian errors in the PMUs. The second method provides a way to calibrate all instrument transformers (both current and voltage) in presence of only one good quality voltage measurement located at the end of a tie-line. This method assumes that all the instrument transformers have ratio errors and the PMUs have quantization errors. The third method attains the same objective as the second one, with the additional constraint that the data obtained from the field may be contaminated. Thus, the third method shows how calibration of all the instrument transformers can be done with data that is intermittent and is therefore, the most practical approach (of the three) for instrument transformer calibration.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Thorp, James S. (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Calibration; Current transformers (CTs); Optimal placement; Phasor Measurement Units (PMUs); Quantized errors; Voltage Transformers (VTs)
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APA (6th Edition):
Chatterjee, P. (2017). On-line Calibration of Instrument Transformers Using Synchrophasor Measurements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/79857
Chicago Manual of Style (16th Edition):
Chatterjee, Paroma. “On-line Calibration of Instrument Transformers Using Synchrophasor Measurements.” 2017. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/79857.
MLA Handbook (7th Edition):
Chatterjee, Paroma. “On-line Calibration of Instrument Transformers Using Synchrophasor Measurements.” 2017. Web. 28 Feb 2020.
Vancouver:
Chatterjee P. On-line Calibration of Instrument Transformers Using Synchrophasor Measurements. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/79857.
Council of Science Editors:
Chatterjee P. On-line Calibration of Instrument Transformers Using Synchrophasor Measurements. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/79857
4.
Thompson, Adam Craig.
The Future of Substations: Centralized Protection and Control.
Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/73177
► Modern power substations continue to use hardware that is dated and resistant to modernization. This document discusses the basics of substations, identifies their weaknesses, and…
(more)
▼ Modern power substations continue to use hardware that is dated and resistant to modernization. This document discusses the basics of substations, identifies their weaknesses, and suggests a method of improvement. This suggestion implements a centralized protection and control system to make the overall system more robust and flexible to the ever changing power system landscape.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Broadwater, Robert P. (committee member).
Subjects/Keywords: power systems; substations; centralized protection and control; transformers; relays
…measurement units” (PMUs) using GPS were developed at Virginia Tech in the 1980s and the…
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APA (6th Edition):
Thompson, A. C. (2016). The Future of Substations: Centralized Protection and Control. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73177
Chicago Manual of Style (16th Edition):
Thompson, Adam Craig. “The Future of Substations: Centralized Protection and Control.” 2016. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/73177.
MLA Handbook (7th Edition):
Thompson, Adam Craig. “The Future of Substations: Centralized Protection and Control.” 2016. Web. 28 Feb 2020.
Vancouver:
Thompson AC. The Future of Substations: Centralized Protection and Control. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/73177.
Council of Science Editors:
Thompson AC. The Future of Substations: Centralized Protection and Control. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73177
5.
Wei, Nan.
A Line Outage Study for Prediction of Static Power Flow Redistribution.
Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/72887
► Transmission line is a crucial role in power transmission network which connects generating units to consumers. Some unpredicted failure events such as lightening or system…
(more)
▼ Transmission line is a crucial role in power transmission network which connects generating units to consumers. Some unpredicted failure events such as lightening or system faults can cause transmission line tripped, which may bring about a large interruption to the system and causes damage. When line outage happens, the power flow on the tripped line will be redistributed to the rest of lines in the system. It may cause risk of overload happens on other lines, and results in a cascading failure and system collapse. Reasonably, a single line outage will not affect all other lines in the system. Therefore, when a line outage happens, it is important for the system operator to have a preview of which lines will have serious impact and which lines will not, so that the operator can only focus on monitoring certain lines which will be seriously affected, rather than keeping monitoring the whole system. In this thesis, A Line Outage Distribution Factor (LODF) method is proposed and implemented in the IEEE 118 bus system to estimate active power flow redistribution after a line outage. After that, a definition of Thevenin electrical distance between two transmission lines is derived and applied to calculate electrical distances between the outage line and each line in the system. An exponential convergence tendency is found between maximum possible LODF predicted power flow variations and electrical distance, and an exponential regression method is applied to analyze this tendency. The contribution of this work is a rule has been found that starting from the outage line, the maximum possible active power flow variation on transmission lines exponentially decreases exponentially while the electrical distance increases. With only the information of system's normal operating condition and topological information, the maximum possible active power change on each lines caused by single line outage, and the margin of the impact of single line outage on power flow variations may propagate along electrical distance can be easily and quickly predicted. Ultimately, the goal of this work is to allow operators at the control center can concentrate on lines within a certain electrical distance instead of keeping monitoring the whole system when a line outage happens.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Kekatos, Vasileios (committee member).
Subjects/Keywords: Transmission Line Outage; Contingency Analysis; Power Flow Redistribution; Line Outage Distribution Factor; Thevenin Equivalent Electrical Distance
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APA ·
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APA (6th Edition):
Wei, N. (2016). A Line Outage Study for Prediction of Static Power Flow Redistribution. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/72887
Chicago Manual of Style (16th Edition):
Wei, Nan. “A Line Outage Study for Prediction of Static Power Flow Redistribution.” 2016. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/72887.
MLA Handbook (7th Edition):
Wei, Nan. “A Line Outage Study for Prediction of Static Power Flow Redistribution.” 2016. Web. 28 Feb 2020.
Vancouver:
Wei N. A Line Outage Study for Prediction of Static Power Flow Redistribution. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/72887.
Council of Science Editors:
Wei N. A Line Outage Study for Prediction of Static Power Flow Redistribution. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/72887
6.
Ayala Zelaya, Marcos Alexander.
Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard.
Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/64471
► Several cascading outages that have occurred in the past have shown the importance of performing appropriate and coordinated transmission system planning between the different Planning…
(more)
▼ Several cascading outages that have occurred in the past have shown the importance of performing appropriate and coordinated transmission system planning between the different Planning Coordinators and Transmission Planners in a power system. In very large, interconnected systems, this coordinated planning is necessary due to the inherent complexity that characterizes non-lineal electric power systems. A major task in transmission system planning is to conduct contingency studies that would determine the consequences in the system when single or multiple of its elements trip due to failure or are disconnected during scheduled maintenance outages. This work develops general programs aimed at facilitating the performance of such contingency studies based on the latest Transmission System Planning Performance Requirement standard issued by NERC, TPL-001-4. The focus of this work is on the requirements for the steady state analysis described in the standard, which includes specific steady state performance planning events. The developed programs have been tested in a few base cases and have demonstrated their ability to facilitate contingency studies with any system regardless of its size.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committeechair), Broadwater, Robert P. (committee member).
Subjects/Keywords: electric power systems; transmission system; planning; steady-state; contingencies; NERC; TPL-001-4
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APA (6th Edition):
Ayala Zelaya, M. A. (2016). Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64471
Chicago Manual of Style (16th Edition):
Ayala Zelaya, Marcos Alexander. “Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard.” 2016. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/64471.
MLA Handbook (7th Edition):
Ayala Zelaya, Marcos Alexander. “Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard.” 2016. Web. 28 Feb 2020.
Vancouver:
Ayala Zelaya MA. Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/64471.
Council of Science Editors:
Ayala Zelaya MA. Steady-State Analysis in Transmission System Planning per Latest TPL-001-4 NERC Standard. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/64471
7.
Karugarama, Marvin Kiiza.
Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics.
Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/64470
► A blackout is defined as the loss of electric power for a given period in a particular area. With increasing dependence on reliable electric power,…
(more)
▼ A blackout is defined as the loss of electric power for a given period in a particular area. With increasing dependence on reliable electric power, the social and economic ramifications of blackouts are dire, negatively impacting the productivity, safety, and security of communities. To reduce blackout occurrence, power system planners incorporate redundancy and advanced controls to the grid to make it more adaptable to disturbances. However, adding redundant transmission lines is not only expensive, it is suboptimal in some contexts. While it is unattainable to have no blackout, it is possible and necessary to implement measures that minimize the likelihood and scale of these outages. This work proposes a solution that uses a microgrid with advanced energy storage and solar PV to mitigate blackouts in Kigali, the capital of Rwanda. A description and steady state analysis of major weaknesses in the Rwandan electric grid is presented. A microgrid application capable of islanding from the system is simulated in the steady state and shown to strengthen the system and decrease the likelihood of blackouts in Kigali. The composition of the microgrid is then designed, simulated, and optimized for technical and financial feasibility using the HOMER model. A microgrid that uses energy storage and solar PV is shown to not only be feasible, but also competitive with current costs of electricity in Rwanda. For comparison, different combinations that include diesel generation are also simulated.
Advisors/Committee Members: Tam, Kwa Sur (committeechair), Centeno, Virgilio A. (committee member), Mili, Lamine M. (committee member).
Subjects/Keywords: Blackouts; microgrids; solar PV; energy storage; Rwanda
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APA (6th Edition):
Karugarama, M. K. (2016). Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64470
Chicago Manual of Style (16th Edition):
Karugarama, Marvin Kiiza. “Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics.” 2016. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/64470.
MLA Handbook (7th Edition):
Karugarama, Marvin Kiiza. “Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics.” 2016. Web. 28 Feb 2020.
Vancouver:
Karugarama MK. Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/64470.
Council of Science Editors:
Karugarama MK. Mitiiation of Blackout in Kigali Using a Microgrid with Advanced Energy Storage and Solar Photovoltaics. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/64470
8.
Nie, Zhijie.
Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment.
Degree: MS, Electrical and Computer Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/78805
► According to the proposed definition and classification of power system stability addressed by IEEE and CIGRE Task Force, voltage stability refers to the stability of…
(more)
▼ According to the proposed definition and classification of power system stability addressed by IEEE and CIGRE Task Force, voltage stability refers to the stability of maintaining the steady voltage magnitudes at all buses in a power system when the system is subjected to a disturbance from a given operating condition (OC). Cascading outage due to voltage collapse is a probable consequence during insecure voltage situations. In this regard, fast responding and reliable voltage security assessment (VSA) is effective and indispensable for system to survive in conceivable contingencies. This paper aims at establishing an online systematic framework for voltage security assessment with high-speed data streams from synchrophasors and phasor data concentrators (PDCs). Periodically updated decision trees (DTs) have been applied in different subjects of security assessments in power systems. However, with a training data set of operating conditions that grows rapidly, re-training and restructuring a decision tree becomes a time-consuming process. Hoeffding-tree-based method constructs a learner that is capable of memory management to process streaming data without retaining the complete data set for training purposes in real-time and
guarantees the accuracy of learner. The proposed approach of voltage security assessment based on Very Fast Decision Tree (VFDT) system is tested and evaluated by the IEEE 118-bus standard system.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Kekatos, Vasileios (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Power Systems Stability; Voltage Security Assessment; Machine Learning; Decision Trees; Hoeffding Trees
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APA ·
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APA (6th Edition):
Nie, Z. (2017). Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78805
Chicago Manual of Style (16th Edition):
Nie, Zhijie. “Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment.” 2017. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/78805.
MLA Handbook (7th Edition):
Nie, Zhijie. “Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment.” 2017. Web. 28 Feb 2020.
Vancouver:
Nie Z. Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/78805.
Council of Science Editors:
Nie Z. Hoeffding-Tree-Based Learning from Data Streams and Its Application in Online Voltage Security Assessment. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78805
9.
Gupta, Sarthak.
Real-time Integration of Energy Storage.
Degree: MS, Electrical and Computer Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/78749
► Increasing dynamics in power systems on account of renewable integration, electric vehicle penetration and rising demands have resulted in the exploration of energy storage for…
(more)
▼ Increasing dynamics in power systems on account of renewable integration, electric vehicle penetration and rising demands have resulted in the exploration of energy storage for potential solutions. Recent technology- and industry-driven developments have led to a drastic decrease in costs of these storages, further advocating their usage. This thesis compiles the author's research on optimal integration of energy storage. Unpredictability is modelled using random variables favouring the need of stochastic optimization algorithms such as Lyapunov optimization and stochastic approximation. Moreover, consumer interactions in a competitive environment implore the need of topics from game theory. The concept of Nash equilibrium is introduced and methods to identify such equilibrium points are laid down. Utilizing these notions, two research contributions are made. Firstly, a strategy for controlling heterogeneous energy storage units operating at different timescales is put forth. They strategy is consequently employed optimally for arbitrage in an electricity market consisting of day-ahead and real-time pricing. Secondly, energy storages owned by consumers connected to different nodes of a power distribution grid are coordinated in a competitive market. A generalized Nash equilibrium problem is formulated for their participation in arbitrage and energy balancing, which is then solved using a novel emph{weighted} Lyapunov approach. In both cases, we design real-time algorithms with provable suboptimality guarantees in terms of the original centralized and equilibrium problems. The algorithms are tested on realistic scenarios comprising of actual data from electricity markets corroborating the analytical findings.
Advisors/Committee Members: Kekatos, Vasileios (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Power system; energy storage; Lyapunov optimization; Game theory; Nash equilibrium
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APA ·
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APA (6th Edition):
Gupta, S. (2017). Real-time Integration of Energy Storage. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78749
Chicago Manual of Style (16th Edition):
Gupta, Sarthak. “Real-time Integration of Energy Storage.” 2017. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/78749.
MLA Handbook (7th Edition):
Gupta, Sarthak. “Real-time Integration of Energy Storage.” 2017. Web. 28 Feb 2020.
Vancouver:
Gupta S. Real-time Integration of Energy Storage. [Internet] [Masters thesis]. Virginia Tech; 2017. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/78749.
Council of Science Editors:
Gupta S. Real-time Integration of Energy Storage. [Masters Thesis]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/78749
10.
Aryal, Durga.
Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/87401
► Reliability of power transmission systems are threatened due to the increasing uncertainties arising from penetration of renewable energy sources, load growth, energy de-regulation and changing…
(more)
▼ Reliability of power transmission systems are threatened due to the increasing uncertainties arising from penetration of renewable energy sources, load growth, energy de-regulation and changing standards. Stability issues become more prevalent than in past due to increasing load growth as the demand for reactive power increases. Several researchers have been studying the impact of increased load growth and increased penetration of renewables on the dynamic stability of the distribution system. However, far less emphasis has been given to the power transmission system. This thesis presents the transient stability analysis of power transmission systems during overloading conditions. Our study also facilitates identification of weak areas of the transmission system during overloading condition. In addition, the impact of replacing conventional synchronous generator by Photovoltaics (PV) on voltage stability of the system is also analyzed. With increasing uncertainties in transmission systems, it is necessary to carefully analyze a wide variety of scenarios while planning the system. The current approach to transmission planning i.e., the deterministic approach does not sufficiently cover all the uncertainties. This has imposed the need for the probabilistic transmission planning approach where the overall system is planned based on the analysis of wide varieties of scenarios. In addition, by considering the probability of occurrence of a scenario, the probability of contingencies and severity of contingencies risk associated with each planning practice is calculated. However, there is no well-established approach that is capable of selecting wide varieties of scenarios based on their probability of occurrence. Due to this limitation, probabilistic approach is not widely implemented in real-world power transmission systems. To address this issue, this thesis presents a new technique, based on K-means clustering, to select scenarios based on their probability of occurrence.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: stability studies; probabilistic planning
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APA (6th Edition):
Aryal, D. (2019). Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/87401
Chicago Manual of Style (16th Edition):
Aryal, Durga. “Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid.” 2019. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/87401.
MLA Handbook (7th Edition):
Aryal, Durga. “Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid.” 2019. Web. 28 Feb 2020.
Vancouver:
Aryal D. Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/87401.
Council of Science Editors:
Aryal D. Analysis and Planning of Power Transmission System Subject to Uncertainties in the Grid. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/87401
11.
Swanberg, Boone Thomas.
A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships.
Degree: MS, Electrical Engineering, 2018, Virginia Tech
URL: http://hdl.handle.net/10919/84397
► This work discusses the implementation of a Unique Ships Grid design that utilizes Energy Storage. This Unique Ships Grid is used to enhance the efficiency…
(more)
▼ This work discusses the implementation of a Unique Ships Grid design that utilizes Energy Storage. This Unique Ships Grid is used to enhance the efficiency of a Construction Single-Hull River Tender previously discussed and assessed by the Army Corps of Engineers and the United States Coast Guard (USCG). This Grid Design is shown to be both in compliance with applicable regulations and reliable due to built-in redundancy. Compliance with regulations and redundancy are both prized by the Maritime Community and the USCG. An applicable Heuristic Design Methodology is provided in conjunction with the Unique Ships Grid. This Design Methodology can be used with a simple load analysis and results in a Load Center breakdown and the sizing of Cables, Generators, Inverter, and required Energy Storage. This design process is shown to provide an inherent margin for growth and safety. This design process is quick and results in values necessary to do a cost analysis, environmental impact survey, and stability analysis (Ship Stability not Electrical Stability).
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Kekatos, Vasileios (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Shipboard Power Systems; Energy Storage; Shipboard Power Grid; Generator Sizing; Maritime Industry
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APA (6th Edition):
Swanberg, B. T. (2018). A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/84397
Chicago Manual of Style (16th Edition):
Swanberg, Boone Thomas. “A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships.” 2018. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/84397.
MLA Handbook (7th Edition):
Swanberg, Boone Thomas. “A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships.” 2018. Web. 28 Feb 2020.
Vancouver:
Swanberg BT. A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/84397.
Council of Science Editors:
Swanberg BT. A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/84397
12.
Gill, Lee.
Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/93976
► The field of power electronics, which controls and manages the conversion of electrical energy, is an important topic of discussion, as new technologies like electric…
(more)
▼ The field of power electronics, which controls and manages the conversion of electrical energy, is an important topic of discussion, as new technologies like electric vehicles (EV) are quickly emerging and disrupting the current status-quo of vehicle-choice. In order to promote timely and extensive adoption of such an enabling EV technology, it is critical to understand the current challenges involving EV charging stations and seek out opportunities to engender future innovations. Indeed, wide-bandgap (WBG) devices, such as silicon carbide (SiC) and gallium nitride (GaN), have unveiled unprecedented opportunities in enabling the realization of superior power conversion systems. Thus, utilizing these WGB devices in EV charging applications can bring about improved design and development of EV fast chargers that are faster-charging, more efficient, and more effective. Hence, this thesis presents an opportunity in EV charging station applications with the utilization of medium-voltage SiC MOSFETs. Because the current fast-charging solution involves a heavy and bulky transformer, it adds installation complexity for EV charging stations. However, this thesis presents an alternative power-delivery solution that could potentially provide an efficient and fast-charging mechanism of EVs while reducing the size of EV chargers. All things considered, this thesis provides in-depth evaluation-studies of medium-voltage 3.3 kV SiC MOSFET-based power converters, targeted for future fast EV charging applications. The development and design of the hardware prototype is presented in this thesis, along with testing and verification of experimental results.
Advisors/Committee Members: Dong, Dong (committeechair), Burgos, Rolando (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: power electronics; dual active bridge (DAB); flyback; silicon carbide (SiC); wide-bandgap (WBG); medium-voltage (MV); electric vehicle (EV)
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APA (6th Edition):
Gill, L. (2019). Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93976
Chicago Manual of Style (16th Edition):
Gill, Lee. “Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application.” 2019. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/93976.
MLA Handbook (7th Edition):
Gill, Lee. “Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application.” 2019. Web. 28 Feb 2020.
Vancouver:
Gill L. Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/93976.
Council of Science Editors:
Gill L. Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93976
Virginia Tech
13.
Fernandez, Javier Oscar.
The Virginia Tech Calibration System.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/32669
► Phasor measurement unit (PMU) applications on power grid monitoring systems have been implemented since the early ninetyâ s. Large monitoring system network performance relies on…
(more)
▼ Phasor measurement unit (PMU) applications on power grid monitoring systems have been implemented since the early ninetyâ s. Large monitoring system network performance relies on the consistent measurements of PMUs across the system. This has become a major challenge for designers since large networks use PMUs from various manufacturers who likely implement different synchrophasor technologies to perform the phasor estimations. The current synchrophasor standard, the IEEE C37.118-2005 Synchrophasor Standard, covers adequately the steady-state characterization of PMUs but does not specify transient condition requirements. The North American Synchrophasor Initiative (NASPI) has developed a guide outlining the several tests required for dynamic characterization of PMUs. The National Institute of Standards and Technology (NIST) developed two PMU testing stands for steady-state conformance with the current standard and for dynamic performance testing. Since May 2010,
Virginia Tech has been working closely with the NIST in developing a PMU testing system similar to the NIST designs for commercial testing of PMUs and research purposes, the
Virginia Tech Calibration System. This thesis focuses on assessing the system accuracy differences between the designs, and the software interface modifications to adapt the new hardware.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committee member), Conners, Richard W. (committee member).
Subjects/Keywords: pmu calibration; pmu; phasor; calibration system
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APA (6th Edition):
Fernandez, J. O. (2011). The Virginia Tech Calibration System. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32669
Chicago Manual of Style (16th Edition):
Fernandez, Javier Oscar. “The Virginia Tech Calibration System.” 2011. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/32669.
MLA Handbook (7th Edition):
Fernandez, Javier Oscar. “The Virginia Tech Calibration System.” 2011. Web. 28 Feb 2020.
Vancouver:
Fernandez JO. The Virginia Tech Calibration System. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/32669.
Council of Science Editors:
Fernandez JO. The Virginia Tech Calibration System. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/32669
Virginia Tech
14.
Quint, Ryan David.
Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/35667
► Todayâ s electric power system is operated under increasingly stressed conditions. As electrical demand increases, the existing grid is operated closer to its stable operating…
(more)
▼ Todayâ s electric power system is operated under increasingly stressed conditions. As electrical demand increases, the existing grid is operated closer to its stable operating limits while maintaining high reliability of electric power delivery to its customers. Protective schemes are designed to account for pressures towards unstable operation, but there is always a tradeoff between security and dependability of this protection.
Adaptive relaying schemes that can change or modify their operation based on prevailing system conditions are an example of a protective scheme increasing reliability of the power system. The purpose of this thesis is to validate and analyze implementation of the Security-Dependability Adaptive Voting Scheme. It is demonstrated that this scheme can be implemented with a select few Phasor Measurement Units (PMUs) reporting positive sequence currents to a Phasor Data Concentrator (PDC). At the PDC, the state of the power system is defined as Stressed or Safe and a set of relays either vote or perform normal operation, respectively.
The Adaptive Voting Scheme was implemented using two configurations: hardware- and software-based PDC solutions. Each was shown to be functional, effective, and practical for implementation. Practicality was based on the latency of Wide Area Measurement (WAM) devices and the added latency of relay voting operation during Stressed conditions. Phasor Measurement Units (PMUs), Phasor Data Concentrators (PDCs), and relay operation delays were quantified to determine the benefits and limitations of WAMS protection and implementation of the voting scheme. It is proposed that the delays injected into the existing protection schemes would have minimal effect on the voting scheme but must be accounted for when implementing power system controls due to the real-time requirements of the data.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committee member), Broadwater, Robert P. (committee member).
Subjects/Keywords: adaptive protection; decision trees; phasor measurement unit; phasor data concentrator; wide area measurements
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APA (6th Edition):
Quint, R. D. (2011). Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/35667
Chicago Manual of Style (16th Edition):
Quint, Ryan David. “Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees.” 2011. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/35667.
MLA Handbook (7th Edition):
Quint, Ryan David. “Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees.” 2011. Web. 28 Feb 2020.
Vancouver:
Quint RD. Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/35667.
Council of Science Editors:
Quint RD. Practical Implementation of a Security-Dependability Adaptive Voting Scheme Using Decision Trees. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/35667
Virginia Tech
15.
Pal, Anamitra.
Coordinated Control of Inter-area Oscillations using SMA and LMI.
Degree: MS, Electrical and Computer Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/41229
► The traditional approach to damp inter-area oscillations is through the installation of Power System Stabilizers (PSSs) which provide damping control action through excitation control systems…
(more)
▼ The traditional approach to damp inter-area oscillations is through the installation of Power System Stabilizers (PSSs) which provide damping control action through excitation control systems of the generating units. However, study of recent blackouts has shown that the control action provided by a PSS alone is not sufficient for damping oscillations in modern power systems which operate under stressed conditions. An integrated form of control using remote measurements to coordinate the different control elements present in the system is the need of the hour.
One way of implementing such a coordinated control is through the development of a Linear Matrix Inequality (LMI)-based polytopic model of the system that guarantees pole placement for a variety of operating conditions. The size of the polytopic formulation is an issue for application of LMIs to large systems. The use of Selective Modal Analysis (SMA) alleviates this problem by reducing the size of the system. The previous attempts have used a model containing all the and modes, with SMA being used to eliminate all the other states. In practical applications the resulting system was still found to be too large to use in a polytopic model. This thesis presents an algorithm to reduce the size of the system to the relevant modes of oscillations.
A 16 machine, 68 bus equivalent model of the New England-New York interconnected power system is used as the test case with DC lines and SVCs acting as the control. The algorithm is then applied to a 127-bus equivalent model of the WECC System. The use of ESDs as a form of control is also demonstrated. The results indicate that the proposed control successfully damps the relevant modes of oscillations without negatively damping the other modes. The control is then transferred to a more detailed 4000+ bus model of the WECC system to realize its performance on real-world systems.
Advisors/Committee Members: Thorp, James S. (committeechair), Centeno, Virgilio A. (committee member), Broadwater, Robert P. (committee member).
Subjects/Keywords: Polytopic Model; Selective Modal Analysis (SMA); Wide Area Measurements; Inter-area Oscillations; Linear Matrix Inequality (LMI) Control
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APA (6th Edition):
Pal, A. (2012). Coordinated Control of Inter-area Oscillations using SMA and LMI. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/41229
Chicago Manual of Style (16th Edition):
Pal, Anamitra. “Coordinated Control of Inter-area Oscillations using SMA and LMI.” 2012. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/41229.
MLA Handbook (7th Edition):
Pal, Anamitra. “Coordinated Control of Inter-area Oscillations using SMA and LMI.” 2012. Web. 28 Feb 2020.
Vancouver:
Pal A. Coordinated Control of Inter-area Oscillations using SMA and LMI. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/41229.
Council of Science Editors:
Pal A. Coordinated Control of Inter-area Oscillations using SMA and LMI. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/41229
Virginia Tech
16.
Dekhane, Kunal Shashikant.
The Virginia Tech Phasor Data Concentrator Analysis & Testing System.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/46332
► The development of Smart Grid and an increased emphasis on Wide Area Measurement, Automation, Protection and Control (WAMPAC) has lead to the substantial increase in…
(more)
▼ The development of Smart Grid and an increased emphasis on Wide Area Measurement,
Automation, Protection and Control (WAMPAC) has lead to the substantial increase in the
development and use of Synchrophasor Systems. The Department of Energy having realized its
importance in the Power System has encouraged its deployment through the Smart Grid
Investment Grant. With many utilities beginning to implement a large number of PMUs over
their respective power systems, Phasor Data Concentrators (PDCs) play a crucial part in
accurately relaying data from the point of measurement to the operators at the control center. The
current Synchrophasor standard, IEEE C37.118-2005 covers adequately the steady state
characterization of PMUs but does not specify requirements for PDCs. Having recognized the
need for such a standard for PDCs, the North American Synchrophasor Initiative (NASPI) has
developed a guide outlining some of its objectives, functions and tests requirements.
Virginia
Tech has developed a PDC Test System under these guidelines and as per the requirements of the
PJM Synchrophasor Systems Deployment Project. This thesis focuses on the testing tools
developed and the procedures implemented in the
Virginia Tech PDC Test System.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Mili, Lamine M. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: synchrophasor; pdc; pdc testing; latency; pmu simulator
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APA (6th Edition):
Dekhane, K. S. (2011). The Virginia Tech Phasor Data Concentrator Analysis & Testing System. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/46332
Chicago Manual of Style (16th Edition):
Dekhane, Kunal Shashikant. “The Virginia Tech Phasor Data Concentrator Analysis & Testing System.” 2011. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/46332.
MLA Handbook (7th Edition):
Dekhane, Kunal Shashikant. “The Virginia Tech Phasor Data Concentrator Analysis & Testing System.” 2011. Web. 28 Feb 2020.
Vancouver:
Dekhane KS. The Virginia Tech Phasor Data Concentrator Analysis & Testing System. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/46332.
Council of Science Editors:
Dekhane KS. The Virginia Tech Phasor Data Concentrator Analysis & Testing System. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/46332
Virginia Tech
17.
Schmitt, Andreas Joachim.
Digital Implementation of Power System Metering and Protection.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/51194
► An entirely digital system is presented which has several benefits as compared to the systems that are deployed currently. Utilizing digital capabilities to a much…
(more)
▼ An entirely digital system is presented which has several benefits as compared to the systems that are deployed currently. Utilizing digital capabilities to a much greater extent than is currently used within the power system allows for various improvements upon the current system. One such improvement is the ease of configuring and using the system. Each device can easily alter its functionality through a user interface, and the addition of devices is as easy as plugging it in. Additionally, the burden on the transformer due to the increase in the number of devices is nullified. The information remains accurate and unchanged, even when new devices are added to the system. The entire system conforms to the IEC 61850 standard, such that it adheres to the requirements of the actual power system.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Broadwater, Robert P. (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Power Systems Communications; Power Systems Management; Substation Automation
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APA (6th Edition):
Schmitt, A. J. (2015). Digital Implementation of Power System Metering and Protection. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51194
Chicago Manual of Style (16th Edition):
Schmitt, Andreas Joachim. “Digital Implementation of Power System Metering and Protection.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/51194.
MLA Handbook (7th Edition):
Schmitt, Andreas Joachim. “Digital Implementation of Power System Metering and Protection.” 2015. Web. 28 Feb 2020.
Vancouver:
Schmitt AJ. Digital Implementation of Power System Metering and Protection. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/51194.
Council of Science Editors:
Schmitt AJ. Digital Implementation of Power System Metering and Protection. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/51194
Virginia Tech
18.
Delport, Jacques.
Synchronized Measurement of Machine Rotor Angle and Its Application.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/51242
► The internal voltage angle of a generator is an important parameter that indicates the stability, both transient and steady-state, of the generator. This paper proposes…
(more)
▼ The internal voltage angle of a generator is an important parameter that indicates the stability, both transient and steady-state, of the generator. This paper proposes a method of measuring and synchronizing the internal angle using a microprocessor and an optical encoder installed on the shaft of a generator. With a synchronized angle measurement, accurate stability studies and wide-area controls can be implemented. The experimental setup for measuring the rotor angle of a generator is explained in this work.
A wide-area power system stabilizer implementing the synchronized angle measurement is then investigated using a four machine, two-area system. A synchronized remote feedback rotor angle signal is included in a traditional stabilizer design. It is shown that this remote signal helps increase the stability of the system while also having the benefit of being able to be predicted accurately. This capability makes bad data detection and communication delay compensation possible.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Abbott, Amos L. (committee member).
Subjects/Keywords: Rotor Angle; Synchronization; Power System Stabilizer
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APA (6th Edition):
Delport, J. (2015). Synchronized Measurement of Machine Rotor Angle and Its Application. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51242
Chicago Manual of Style (16th Edition):
Delport, Jacques. “Synchronized Measurement of Machine Rotor Angle and Its Application.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/51242.
MLA Handbook (7th Edition):
Delport, Jacques. “Synchronized Measurement of Machine Rotor Angle and Its Application.” 2015. Web. 28 Feb 2020.
Vancouver:
Delport J. Synchronized Measurement of Machine Rotor Angle and Its Application. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/51242.
Council of Science Editors:
Delport J. Synchronized Measurement of Machine Rotor Angle and Its Application. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/51242
Virginia Tech
19.
Bhela, Siddharth.
A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/52026
► Game theory has its applications in various domains, but has only recently been applied to study open problems in smart microgrids. A simple microgrid system…
(more)
▼ Game theory has its applications in various domains, but has only recently been applied to study open problems in smart microgrids. A simple microgrid system with a small wind farm, a storage facility and an aggregate load entity is studied here using a non-cooperative game-theoretic framework.
The framework developed is used to study the behavior of rational market participants (players), namely wind power producer and energy storage. The framework is implemented to find the existence of any Nash equilibria and see if cooperation is a natural outcome of the game. If cooperation is not self-enforcing then usefulness of the framework to find the conditions for cooperation is presented. It must be noted that cooperation is not automatically guaranteed as the payoff of the energy storage operator is dependent on the strategy employed by the wind power producer. Similarly, the payoff for the wind power producer is highly intertwined with the strategy employed by the energy storage operator. Historical weather and market data is used to calculate expected payoffs for each possible combination of strategies. The results are presented in the form of payoff matrices and the best response algorithm and/or elimination of dominated strategies is used to find the Nash equilibrium.
Sensitivity of the Nash equilibrium to various storage parameters like storage size, charging/discharging limits, charging/discharging efficiency, and other market parameters like energy imbalance penalties, efficiency of up/down regulation, and electricity market prices is studied and necessary conditions for cooperation are presented.
Advisors/Committee Members: Tam, Kwa Sur (committeechair), Saad, Walid (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Game Theory; Wind Power; Energy Storage; Electricity Markets; Smart Microgrids; Optimization
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APA (6th Edition):
Bhela, S. (2015). A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52026
Chicago Manual of Style (16th Edition):
Bhela, Siddharth. “A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/52026.
MLA Handbook (7th Edition):
Bhela, Siddharth. “A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.” 2015. Web. 28 Feb 2020.
Vancouver:
Bhela S. A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/52026.
Council of Science Editors:
Bhela S. A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/52026
Virginia Tech
20.
Morton, Daniel David.
Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs).
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/52247
► Variable Frequency Drives (VFDs) are utilized in commercial and industrial facilities to improve motor efficiency and provide process flexibility. VFDs are nonlinear loads that inject…
(more)
▼ Variable Frequency Drives (VFDs) are utilized in commercial and industrial facilities to improve motor efficiency and provide process flexibility. VFDs are nonlinear loads that inject harmonic currents into the power system, and result in harmonic voltages across the system impedance. This harmonic distortion can negatively impact the performance of other sensitive loads in the system.
If a VFD serves a critical function, it may be necessary to supply the VFD from a Diesel Generator or Uninterruptible Power Supply (UPS). These sources have relatively high impedance when compared to a standard utility source, and will result in greater harmonic voltage distortion. This increases the likelihood of equipment failure due to harmonics. The full extent of the impact, however, is typically unknown until an extensive harmonic analysis is performed or the system is installed and tested.
This thesis evaluates the impact that source impedance has on the harmonic voltage distortion that is produced by nonlinear loads such as VFDs. An ideal system of varying source types (Utility, Generator and UPS) and varying VFD rectifier technologies (6-Pulse, 12-Pulse and 18-Pulse) is created to perform this analysis and plot the results. The main output of this thesis is a simplified methodology for harmonic analysis that can be implemented when designing a power system with a VFD serving a critical function and a high impedance source like a generator or UPS. Performing this analysis will help to ensure that other sensitive loads will operate properly in the system.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Phadke, Arun G. (committee member).
Subjects/Keywords: Harmonic Analysis; Power Electronics; Variable Frequency Drives
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APA (6th Edition):
Morton, D. D. (2015). Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs). (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52247
Chicago Manual of Style (16th Edition):
Morton, Daniel David. “Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs).” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/52247.
MLA Handbook (7th Edition):
Morton, Daniel David. “Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs).” 2015. Web. 28 Feb 2020.
Vancouver:
Morton DD. Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs). [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/52247.
Council of Science Editors:
Morton DD. Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs). [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/52247
Virginia Tech
21.
Nazir, Mohammad Nawaf.
Control of Power Flow in Transmission Lines using Distributed Series Reactors.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/52978
► Distributed Series Reactors (DSRs) can be used to control power flow to more fully utilize the capacity of a transmission network, delaying investment in new…
(more)
▼ Distributed Series Reactors (DSRs) can be used to control power flow to more fully utilize the capacity of a transmission network, delaying investment in new transmission lines. In this study the IEEE 39 bus standard test system is modified to a 3-phase, unbalanced model consisting of 230 kV, 345 kV and 500 kV lines, where lines of different voltage run in parallel. This model is used to study load growth and the effect of adding DSRs to alleviate resulting overloads, and in particular to alleviate overloads on lines of different voltage running in parallel. The economic benefit of adding DSRs to the network is compared to the addition of new transmission lines in the network. In the second part of the work, the effect of unsymmetrical operation of DSRs on a single transmission line is studied and compared to the symmetrical operation of DSRs. It is found that the unsymmetrical operation of DSRs is more economical. Finally the unsymmetrical operation of DSRs to reduce voltage imbalance in the network is considered.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), De La Ree Lopez, Jaime (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Distributed Series Reactor (DSR) Design; Load Growth; Power Flow Control; Unbalanced Transmission Systems; Voltage Balancing
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APA (6th Edition):
Nazir, M. N. (2015). Control of Power Flow in Transmission Lines using Distributed Series Reactors. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52978
Chicago Manual of Style (16th Edition):
Nazir, Mohammad Nawaf. “Control of Power Flow in Transmission Lines using Distributed Series Reactors.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/52978.
MLA Handbook (7th Edition):
Nazir, Mohammad Nawaf. “Control of Power Flow in Transmission Lines using Distributed Series Reactors.” 2015. Web. 28 Feb 2020.
Vancouver:
Nazir MN. Control of Power Flow in Transmission Lines using Distributed Series Reactors. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/52978.
Council of Science Editors:
Nazir MN. Control of Power Flow in Transmission Lines using Distributed Series Reactors. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/52978
Virginia Tech
22.
Wang, Hao.
Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/54565
► Fault location detection plays a crucial role in power transmission network, especially on security, stabilization and economic aspects. Accurate fault location detection in transmission network…
(more)
▼ Fault location detection plays a crucial role in power transmission network, especially on security, stabilization and economic aspects. Accurate fault location detection in transmission network helps to speed up the restoration time, therefore, reduce the outage time and improve the system reliability [1]. With the development of Wide Area Measurement System (WAMS) and Phasor Measurement Unit (PMU), various fault location algorithms have been proposed.
The purpose of this work is to determine, modify and test the most appropriate fault location method which can be implemented with a PMU only linear state estimator. The thesis reviews several proposed fault location methods, such as, one-terminal [2], multi-terminal [3]-[11] and travelling wavelets methods [12]-[13]. A Two-stage fault location algorithm using PMU voltage measurements proposed by Q. Jiang [14] is identified as the best option for adaption to operate with a linear state estimator. The algorithm is discussed in details and several case studies are made to evaluate its effectiveness. The algorithm is shown to be easy to implement and adapt for operation with a linear state estimator. It only requires a limited number of PMU measurements, which makes it more practical than other existing methods. The algorithm is adapted and successfully tested on a real linear state estimator monitored high voltage transmission network.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committee member), Mili, Lamine M. (committee member).
Subjects/Keywords: Fault Location; Transmission Network; PMU Voltage Measurements; Positive Sequence Network; Linear State Estimator
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APA (6th Edition):
Wang, H. (2015). Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/54565
Chicago Manual of Style (16th Edition):
Wang, Hao. “Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/54565.
MLA Handbook (7th Edition):
Wang, Hao. “Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks.” 2015. Web. 28 Feb 2020.
Vancouver:
Wang H. Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/54565.
Council of Science Editors:
Wang H. Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/54565
Virginia Tech
23.
Moorman, Anna Julia.
Alternate Fault testing on a Bus on a Dynamic Position Vessel.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/56568
► Direct fault testing onboard Dynamic Position Vessels is a requirement to maintain the ships classification and ensure redundancy of the power system onboard to maintain…
(more)
▼ Direct fault testing onboard Dynamic Position Vessels is a requirement to maintain the ships classification and ensure redundancy of the power system onboard to maintain position. The most vulnerable part of the ship when testing occurs is when a three phase fault is placed on a main bus. This puts tremendous amount of strain on the system. This thesis offers an alternate and safer way to ensure the protection equipment is working properly by using a fault signal using from Programmable Logic Controller in conjunction with the protection relays. A working PSCAD model of Transocean's DEEPWATER CHAMPION was developed using a one line diagram. Using the developed PSCAD model three phase fault currents could be calculated and then simulated as a scaled down secondary current to use for testing the protection relays. To test the develop testing system different bus configurations were analyzed to determine loss of thruster capabilities which deter the vessel to maintain position.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committee member), Southward, Steve C. (committee member).
Subjects/Keywords: Dynamic Position; Fault testing; Programmable Logic Controller
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APA (6th Edition):
Moorman, A. J. (2015). Alternate Fault testing on a Bus on a Dynamic Position Vessel. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/56568
Chicago Manual of Style (16th Edition):
Moorman, Anna Julia. “Alternate Fault testing on a Bus on a Dynamic Position Vessel.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/56568.
MLA Handbook (7th Edition):
Moorman, Anna Julia. “Alternate Fault testing on a Bus on a Dynamic Position Vessel.” 2015. Web. 28 Feb 2020.
Vancouver:
Moorman AJ. Alternate Fault testing on a Bus on a Dynamic Position Vessel. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/56568.
Council of Science Editors:
Moorman AJ. Alternate Fault testing on a Bus on a Dynamic Position Vessel. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/56568
Virginia Tech
24.
Lowe, Bradley Shayne.
A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/56607
► Transmission line parameters play a significant role in a variety of power system applications. The accuracy of these parameters is of paramount importance. Traditional methods…
(more)
▼ Transmission line parameters play a significant role in a variety of power system applications. The accuracy of these parameters is of paramount importance. Traditional methods of determining transmission line parameters must take a large number of factors into consideration. It is difficult and in most cases impractical to include every possible factor when calculating parameter values. A modern approach to the parameter identification problem is an online method by which the parameter values are calculated using synchronized voltage and current measurements from both ends of a transmission line.
One of the biggest problems facing the synchronized measurement method is line transposition. Several methods have been proposed that demonstrate how the line parameters of a transposed line may be estimated. However, the present case of today's power systems is such that a majority of transmission lines are untransposed. While transposed line methods have value, they cannot be applied in real-world scenarios. Future efforts of using synchronized measurements to estimate transmission line parameters must focus on the development and refining of untransposed line methods.
This thesis reviews the existing methods of estimation transmission line parameters using synchrophasor measurements and proposes a new method of estimating the parameters of an untransposed line. After the proposal of this new method, a sensitivity analysis is conducted to determine its performance when noise is present in the measurements.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Gardner, Robert Matthew (committee member).
Subjects/Keywords: synchronized measurements; line parameters; estimation; least squares; noise
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APA ·
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Export
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APA (6th Edition):
Lowe, B. S. (2015). A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/56607
Chicago Manual of Style (16th Edition):
Lowe, Bradley Shayne. “A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/56607.
MLA Handbook (7th Edition):
Lowe, Bradley Shayne. “A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements.” 2015. Web. 28 Feb 2020.
Vancouver:
Lowe BS. A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/56607.
Council of Science Editors:
Lowe BS. A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/56607
Virginia Tech
25.
Chen, Xiao.
Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation.
Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech
URL: http://hdl.handle.net/10919/71815
► In this work, a size optimization approach for utility-scale solar photovoltaic (PV) systems is proposed. The purpose of the method is to determine the optimal…
(more)
▼ In this work, a size optimization approach for utility-scale solar photovoltaic (PV) systems is proposed. The purpose of the method is to determine the optimal solar energy generation capacity and optimal location by the minimizing total system cost subject to the constraint that the system reliability requirements. Due to the stochastic characteristic of the solar irradiation, the reliability performance of a power system with PV generation is quite different from the one with only conventional generation. Basically, generation adequacy level of power systems containing solar energy is evaluated by reliability assessment and the most widely used reliability index is the loss of load probability (LOLP). The value of LOLP depends on various factors such as power output of the PV system, outage rate of generating facilities and the system load profile. To obtain the LOLP, the Monte Carlo method is applied to simulate the reliability performance of the solar penetrated power system. The total system cost model consists of the system installation cost, mitigation cost, and saving fuel and operation cost. Mitigation cost is accomplished with N-1 contingency analysis. The cost function minimization process is implemented in Genetic Algorithm toolbox, which has the ability to search the global optimum with relative computational simplicity.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committeechair), Kekatos, Vasileios (committee member).
Subjects/Keywords: Sizing optimization; Photovoltaics; Reliability evaluation
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APA (6th Edition):
Chen, X. (2016). Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71815
Chicago Manual of Style (16th Edition):
Chen, Xiao. “Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation.” 2016. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/71815.
MLA Handbook (7th Edition):
Chen, Xiao. “Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation.” 2016. Web. 28 Feb 2020.
Vancouver:
Chen X. Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/71815.
Council of Science Editors:
Chen X. Size Optimization of Utility-Scale Solar PV System Considering Reliability Evaluation. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/71815
Virginia Tech
26.
Zora, Leydi Tatiana.
Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/71829
► Synchrophasor Measurement Units (PMUs) are devices that can not only measure but also time stamp voltage, current, frequency, among others. PMUs take these synchronized measurements…
(more)
▼ Synchrophasor Measurement Units (PMUs) are devices that can not only measure but also time stamp voltage, current, frequency, among others. PMUs take these synchronized measurements as fast as 60 times per second; compared with the traditional 2-4 second SCADA measurements, PMUs bring a much clear and real-time picture of what is happening in the power system. PMUs have been increasingly deployed across transmission power grids worldwide. In the USA this is primarily done by utilities through projects sponsored mainly by SIGS and Smart Grid grants. There are different applications that synchrophasors can provide, including off-line and real-time applications. However, due to budget constraints, technology development and characteristics specific to each system, not all applications are equally suitable and essential for all electric power systems. This thesis provides a method for PMU applications prioritization based on the analysis and results of wide area disturbance events.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Phadke, Arun G. (committee member).
Subjects/Keywords: Synchrophasor; Phasor measurement unit; prioritization; non-quantifiable criteria
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APA (6th Edition):
Zora, L. T. (2015). Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/71829
Chicago Manual of Style (16th Edition):
Zora, Leydi Tatiana. “Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/71829.
MLA Handbook (7th Edition):
Zora, Leydi Tatiana. “Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events.” 2015. Web. 28 Feb 2020.
Vancouver:
Zora LT. Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/71829.
Council of Science Editors:
Zora LT. Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/71829
Virginia Tech
27.
Woyak, Jeremy.
Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories.
Degree: MS, Electrical and Computer Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/31457
► This work investigates some of the features of existing software applications for electric power system planning as well as some of the limitations that keep…
(more)
▼ This work investigates some of the features of existing software applications for electric power system planning as well as some of the limitations that keep these applications from being more frequently used in distribution planning. This work presents a software framework that could facilitate much greater use of a wide variety of planning applications.
An integrated system model (ISM) provides a centralized approach to storing data for access by other planning applications. Additionally, an integrated performance simulator (IPS) facilitates comparing the design projects generated by those various planning applications across many criteria under various load growth scenarios. Furthermore, the IPS can automatically run any number of validation routines on a given design or set of designs, alerting the planning engineer of additional, unanticipated planning needs.
This paper provides three case studies which demonstrate the kinds of detailed evaluation and visualization of trade-offs that an IPS could facilitate. The case studies further highlight the greater levels of detail that may be utilized by the ISM and IPS in analyzing any set of modular designs and load growth scenarios.
Advisors/Committee Members: Centeno, Virgilio A. (committee member), Ravindran, Binoy (committeecochair), Broadwater, Robert P. (committeecochair).
Subjects/Keywords: software; planning; electric power system
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APA (6th Edition):
Woyak, J. (2012). Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31457
Chicago Manual of Style (16th Edition):
Woyak, Jeremy. “Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories.” 2012. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/31457.
MLA Handbook (7th Edition):
Woyak, Jeremy. “Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories.” 2012. Web. 28 Feb 2020.
Vancouver:
Woyak J. Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/31457.
Council of Science Editors:
Woyak J. Software Architecture Considerations for Facilitating Electric Power System Planning Incorporating a Variety of Design Categories. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/31457
Virginia Tech
28.
Mishra, Chetan.
Optimal Substation Coverage for Phasor Measurement Unit Installations.
Degree: MS, Electrical and Computer Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/78056
► The PMU has been found to carry great deal of value for applications in the wide area monitoring of power systems. Historically, deployment of these…
(more)
▼ The PMU has been found to carry great deal of value for applications in the wide area monitoring of power systems. Historically, deployment of these devices has been limited by the prohibitive cost of the device itself. Therefore, the objective of the conventional optimal PMU placement problem is to find the minimum number devices, which if carefully placed throughout the network, either maximize observability or completely observe subject to different constraints. Now due to improved technology and digital relays serving a dual use as relay & PMU, the cost of the PMU device itself is not the largest portion of the deployment cost, but rather the substation installation. In a recently completed large-scale deployment of PMUs on the EHV network,
Virginia Electric & Power Company (VEPCO) has found this to be so. The assumption then becomes that if construction work is done in a substation, enough PMU devices will be placed such that everything at that substation is measured. This thesis presents a technique proposed to minimize the number of substation installations thus indirectly minimizing the synchrophasor deployment costs. Also presented is a brief history of the PMU and its applications along with the conventional Optimal PMU placement problem and the scope for expanding this work.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Thorp, James S. (committee member), Baumann, William T. (committee member).
Subjects/Keywords: PMU placement; substation oriented approach; binary particle swarm optimization (BPSO)
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MLA ·
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Export
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APA (6th Edition):
Mishra, C. (2012). Optimal Substation Coverage for Phasor Measurement Unit Installations. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78056
Chicago Manual of Style (16th Edition):
Mishra, Chetan. “Optimal Substation Coverage for Phasor Measurement Unit Installations.” 2012. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/78056.
MLA Handbook (7th Edition):
Mishra, Chetan. “Optimal Substation Coverage for Phasor Measurement Unit Installations.” 2012. Web. 28 Feb 2020.
Vancouver:
Mishra C. Optimal Substation Coverage for Phasor Measurement Unit Installations. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/78056.
Council of Science Editors:
Mishra C. Optimal Substation Coverage for Phasor Measurement Unit Installations. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/78056
Virginia Tech
29.
Mitchell-Colgan, Elliott.
Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/78068
► Judicious Power System Planning ensures the adequacy of infrastructure to support continuous reliability and economy of power system operations. Planning processes have a long and…
(more)
▼ Judicious Power System Planning ensures the adequacy of infrastructure to support continuous reliability and economy of power system operations. Planning processes have a long and rather successful history in the United States, but the recent infl‚ux of unpredictable, nondispatchable generation such as Wind Energy Conversion Systems (WECS) necessitates the re-evaluation of the merit of planning methodologies in the changing power system context. Traditionally, planning has followed a logical progression through generation, transmission, reactive power, and finally auxiliary system planning using expertise and ranking schemes. However, it is challenging to incorporate all of the inherent dependencies between expansion candidates' system impacts using these schemes. Simulation based optimization provides a systematic way to explore acceptable expansion plans and choose one or several "best" plans while considering those complex dependencies.
Using optimization to solve the minimum-cost, reliability-constrained Generation and Transmission Expansion Problem (GTEP) is not a new concept, but the technology is not mature. This work inspects: load uncertainty modeling; sequential (GEP then TEP) versus unified (GTEP) models; and analyzes the impact on the methodologies achieved near-optimal plan. A sensitivity simulation on the original system and final, upgraded system is performed.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Thorp, James S. (committee member), De La Ree, Jaime (committee member).
Subjects/Keywords: Load Uncertainty; Optimization; Power System Planning
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Manager
APA (6th Edition):
Mitchell-Colgan, E. (2015). Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78068
Chicago Manual of Style (16th Edition):
Mitchell-Colgan, Elliott. “Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/78068.
MLA Handbook (7th Edition):
Mitchell-Colgan, Elliott. “Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem.” 2015. Web. 28 Feb 2020.
Vancouver:
Mitchell-Colgan E. Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/78068.
Council of Science Editors:
Mitchell-Colgan E. Modeling Considerations for the Long-Term Generation and Transmission Expansion Power System Planning Problem. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/78068
Virginia Tech
30.
Agrawal, Ashish.
Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies.
Degree: MS, Electrical and Computer Engineering, 2015, Virginia Tech
URL: http://hdl.handle.net/10919/78088
► The variable nature of photovoltaic (PV) generation can cause voltage fluctuations in power distribution systems. Feedback control can be used to minimize the voltage fluctuations.…
(more)
▼ The variable nature of photovoltaic (PV) generation can cause voltage fluctuations in power distribution systems. Feedback control can be used to minimize the voltage fluctuations. This thesis presents the results obtained from comparing the control performance of two types of PV generation feedback control, namely Volt-VAR control and constant power factor control. A three minute PV generation transient is used to evaluate controller performance, where the transient data used originated from one second measurements taken on an actual PV generator. Using the three minute transient, a set of parametric studies are performed on both feedback control strategies. The performance of the control strategies are compared as to voltage control on the distribution feeder and also to the effect that the control may have on transmission system voltage. In considering transmission system voltage, the reactive power drawn from the substation during the transient is evaluated. Simulation results suggest that the choice of control to be implemented should be based on both transmission and distribution system operational concerns.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Constant Power Factor Controllers; Feedback Controllers; PV Generation; Voltage Control; Volt-VAR Controllers
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Manager
APA (6th Edition):
Agrawal, A. (2015). Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78088
Chicago Manual of Style (16th Edition):
Agrawal, Ashish. “Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies.” 2015. Masters Thesis, Virginia Tech. Accessed February 28, 2020.
http://hdl.handle.net/10919/78088.
MLA Handbook (7th Edition):
Agrawal, Ashish. “Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies.” 2015. Web. 28 Feb 2020.
Vancouver:
Agrawal A. Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Feb 28].
Available from: http://hdl.handle.net/10919/78088.
Council of Science Editors:
Agrawal A. Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/78088
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