You searched for +publisher:"Virginia Tech" +contributor:("Centeno, Virgilio A.").
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Virginia Tech
1.
Gyawali, Sanij.
Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning.
Degree: MS, Electrical Engineering, 2020, Virginia Tech
URL: http://hdl.handle.net/10919/100591 
► Independent system Operators (ISO) and Distribution system operators (DSO) have a responsibility to provide uninterrupted power supply to consumers. That along with the longing to…
(more)
▼ Independent system Operators (ISO) and Distribution system operators (DSO) have a responsibility to provide uninterrupted power supply to consumers. That along with the
longing to keep operating cost minimum, engineers and planners study the system beforehand and seek to find the optimum capacity for each of the power system elements like
generators, transformers, transmission lines, etc. Then they test the overall system using
power system models, which are mathematical representation of the real components, to
verify the stability and strength of the system. However, the verification is only as good as
the system models that are used. As most of the power systems components are controlled
by the operators themselves, it is easy to develop a model from their perspective. The load
is the only component controlled by consumers. Hence, the necessity of better load models.
Several studies have been made on static load modeling and the performance is on par with
real behavior. But dynamic loading, which is a load behavior dependent on time, is rather
difficult to model. Some attempts on dynamic load modeling can be found already. Physical
component-based and mathematical transfer function based dynamic models are quite widely
used for the study. These load structures are largely accepted as a good representation of
the systems dynamic behavior. With a load structure in hand, the next task is estimating
their parameters. In this research, we tested out some new machine learning methods to
accurately estimate the parameters. Thousands of simulated data are used to train machine
learning models. After training, we validated the models on some other unseen data. This
study finally goes on to recommend better methods to load modeling.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Reelopez, Jaime (committee member), Kekatos, Vasileios (committee member).
Subjects/Keywords: Dynamic Load Modeling; Neural Network; Long-Short Term Memory; Support Vector Regression; Phasor Measurement Units
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APA (6th Edition):
Gyawali, S. (2020). Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/100591
Chicago Manual of Style (16th Edition):
Gyawali, Sanij. “Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning.” 2020. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/100591.
MLA Handbook (7th Edition):
Gyawali, Sanij. “Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning.” 2020. Web. 21 Apr 2021.
Vancouver:
Gyawali S. Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/100591.
Council of Science Editors:
Gyawali S. Dynamic Load Modeling from PSSE-Simulated Disturbance Data using Machine Learning. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/100591
Virginia Tech
2.
Skoff, Nicholas Michael.
Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks.
Degree: MS, Electrical Engineering, 2020, Virginia Tech
URL: http://hdl.handle.net/10919/98591
► Power system infrastrcutures are changing rapidly from analog arrangements to entirely digital methods. This offers numeous benefits such as increased efficiency, lower cost, higher accuracy,…
(more)
▼ Power system infrastrcutures are changing rapidly from analog arrangements to entirely digital methods. This offers numeous benefits such as increased efficiency, lower cost, higher accuracy, and even improved safety. However, digital implementations do not have an as proven track record as compared to conventional practices, leading to concerns about their reliaiblity. This research tests the performance an en entirely digital protection scheme by using various hardware components. The results are analyzed and show that the novel scheme operates correctly, albeit with a slight delay as compared to traditional methods.
Advisors/Committee Members: De La Reelopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Nazhandali, Leyla (committee member).
Subjects/Keywords: Digital Substations; Sampled Measured Values; Protection Automation
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APA (6th Edition):
Skoff, N. M. (2020). Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/98591
Chicago Manual of Style (16th Edition):
Skoff, Nicholas Michael. “Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks.” 2020. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/98591.
MLA Handbook (7th Edition):
Skoff, Nicholas Michael. “Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks.” 2020. Web. 21 Apr 2021.
Vancouver:
Skoff NM. Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/98591.
Council of Science Editors:
Skoff NM. Performance Analysis of Sampled Values-Based Protection in IEC 61850 Process Bus Networks. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/98591
Virginia Tech
3.
Schmitt, Andreas Joachim.
Digital Implementation of Power System Metering and Protection.
Degree: MS, Electrical 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 April 21, 2021.
http://hdl.handle.net/10919/51194.
MLA Handbook (7th Edition):
Schmitt, Andreas Joachim. “Digital Implementation of Power System Metering and Protection.” 2015. Web. 21 Apr 2021.
Vancouver:
Schmitt AJ. Digital Implementation of Power System Metering and Protection. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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
4.
Zora, Leydi Tatiana.
Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events.
Degree: MS, Electrical 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 April 21, 2021.
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. 21 Apr 2021.
Vancouver:
Zora LT. Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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
5.
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 April 21, 2021.
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. 21 Apr 2021.
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 2021 Apr 21].
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
6.
Moorman, Anna Julia.
Alternate Fault testing on a Bus on a Dynamic Position Vessel.
Degree: MS, Electrical 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 April 21, 2021.
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. 21 Apr 2021.
Vancouver:
Moorman AJ. Alternate Fault testing on a Bus on a Dynamic Position Vessel. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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
7.
Sahani, Nitasha.
Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/96544
► There is an enhanced rate of global warming due to emissions and increased usage of fossil fuels in the transportation sector. As a feasible solution,…
(more)
▼ There is an enhanced rate of global warming due to emissions and increased usage of fossil fuels in the transportation sector. As a feasible solution, electrification of transportation has become a necessary step towards an environment-friendly future. The escalation in plug-in electric vehicles (PEVs) has increased the impact on loading and voltage fluctuations in the distribution grid due to uncoordinated charging. This puts on extra stress on the grid system and compromises the system performance. As a measure to control the vehicle charging in a residential setup, a real-time optimal charging scheduling algorithm is developed which is implemented at the neighborhood level. To increase the charging performance with the limited available resources, an aggregator is introduced. The charging profit is maximized as the PEV charging problem is solved optimally by the aggregator. This facilitates the reduction in night-time grid congestion and maximization of number of PEVs getting charged with limited dependency on communication to avoid long delays in charging control. The proposed technique guarantees the complete charging of the selected PEVs in the stipulated time while considering the power grid operational constraints. It also reduces the impact of peak load demand by flattening the base load demand curve. To demonstrate the efficiency of the proposed mixed integer linear programming optimization algorithm, numerical tests for an IEEE 13 node feeder are performed. The results are discussed to give an outlook on the balance between system and user requirements by meeting the demand of the PEV
users.
Advisors/Committee Members: Liu, Chen-Ching (committeechair), Centeno, Virgilio A. (committee member), Lopez, Jaime De La Ree (committee member).
Subjects/Keywords: Electric vehicles; Charging scheduling; Mixed integer linear programming (MILP); Moving time horizon; Charging optimization
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APA (6th Edition):
Sahani, N. (2019). Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/96544
Chicago Manual of Style (16th Edition):
Sahani, Nitasha. “Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/96544.
MLA Handbook (7th Edition):
Sahani, Nitasha. “Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach.” 2019. Web. 21 Apr 2021.
Vancouver:
Sahani N. Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/96544.
Council of Science Editors:
Sahani N. Optimal Charging Scheduling for Electric Vehicles Based on a Moving Horizon Approach. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/96544
Virginia Tech
8.
Jain, Akshay Kumar.
Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design.
Degree: MS, Electrical Engineering, 2018, Virginia Tech
URL: http://hdl.handle.net/10919/82481
► Distribution feeders form the last leg of the bulk power system and have the responsibility of providing reliable power to the customers. These feeders experience…
(more)
▼ Distribution feeders form the last leg of the bulk power system and have the responsibility of providing reliable power to the customers. These feeders experience voltage drops due to a combination of feeder length, load distribution, and other factors. Traditionally, voltage drop was a major concern. Now, due to an ever-increasing PV penetration, overvoltage has also become a major concern. This limits the amount of solar PV that may be integrated.
Few solutions exist to improve the voltage profile, where the most common is the use of voltage control devices like shunt capacitors and voltage regulators. Due to a large number of design parameters to be considered, the determination of the numbers and locations of these devices is a challenging problem. Significant research has been done to address this problem, utilizing a wide array of optimization techniques. However, many utilities still determine these locations and numbers manually. This is because most algorithms have not been adequately validated. The validation of a voltage profile design (VPD) algorithm has been presented here. The validation of this algorithm was carried out on a set of statistically relevant feeders. These feeders were chosen based on the results obtained from a feeder taxonomy study using clustering analysis. The algorithm was found to be effective in enhancing the amount of solar PV a feeder may host, while still maintaining all the voltages within the ANSI standard limits. Furthermore, the methodology adopted here may also be used for the validation of other algorithms.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Voltage Profile Design; PV Hosting Capacity; Clustering Analysis; Representative Distribution Feeders
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APA ·
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Manager
APA (6th Edition):
Jain, A. K. (2018). Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/82481
Chicago Manual of Style (16th Edition):
Jain, Akshay Kumar. “Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design.” 2018. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/82481.
MLA Handbook (7th Edition):
Jain, Akshay Kumar. “Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design.” 2018. Web. 21 Apr 2021.
Vancouver:
Jain AK. Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/82481.
Council of Science Editors:
Jain AK. Enhancing PV Hosting Capacity of Distribution Feeders using Voltage Profile Design. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/82481
Virginia Tech
9.
Krishnan, Anaga.
Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/89905
► Distribution systems carry electricity from the transmission system and deliver it to the customers. Distribution systems mainly operate using two topologies for their feeders: Radial…
(more)
▼ Distribution systems carry electricity from the transmission system and deliver it to the customers. Distribution systems mainly operate using two topologies for their feeders: Radial and Meshed. The majority of customers are served using radial distribution systems, as in the radial feeders power flows in one direction (i.e. from substation to the end-user). They are simple in design and operation and are constructed at a moderate cost. However, if there is a fault along the main feeder, there will be an interruption of power to the end-use customer. On the other hand, meshed distribution systems involve multiple paths of power flow between all the points in the network. If a fault occurs along the feeder, the power flow is rerouted to the other available paths. Thus, Heavily Due to their complex topology, meshed systems are expensive to construct and deploy. The power flow analysis of these systems poses many challenges. Because of these reasons, their use is mainly restricted to urban areas with high load density which require very high reliability. The future grid is becoming increasingly complex and evolving to a meshed distribution topology has its own advantages. However, as presently the use of meshed systems is sparse, the work done on evaluating the stability of these systems is minimal. As a result of which, this thesis focuses on determining the optimal power flow solvers for these complex systems, analyzing their stability under abnormal operating conditions, and suggesting methods to reinforce the vulnerabilities in the system.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Reelopez, Jaime (committee member).
Subjects/Keywords: Power Distribution System; Meshed Distribution System; Voltage Stability Analysis; Stability Margin.
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APA (6th Edition):
Krishnan, A. (2019). Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/89905
Chicago Manual of Style (16th Edition):
Krishnan, Anaga. “Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/89905.
MLA Handbook (7th Edition):
Krishnan, Anaga. “Robustness and Stability Analysis with a Heavily-Meshed Distribution Network.” 2019. Web. 21 Apr 2021.
Vancouver:
Krishnan A. Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/89905.
Council of Science Editors:
Krishnan A. Robustness and Stability Analysis with a Heavily-Meshed Distribution Network. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/89905
Virginia Tech
10.
Sehgal, Rakesh.
Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting.
Degree: MS, Electrical Engineering, 2014, Virginia Tech
URL: http://hdl.handle.net/10919/25867
► Forecasting has its application in various domains as the decision-makers are provided with a more predictable and reliable estimate of events that are yet to…
(more)
▼ Forecasting has its application in various domains as the decision-makers are provided with a more predictable and reliable estimate of events that are yet to occur. Typically, a user would invest in licensed software or subscribe to a monthly or yearly plan in order to make such forecasts. The framework presented here differs from conventional software in forecasting, as it allows any interested party to use the proposed services on a pay-per-use basis so that they can avoid investing heavily in the required infrastructure.
The Framework-as-a-Service (FaaS) presented here uses Windows Communication Foundation (WCF) to implement Service-Oriented Architecture (SOA). For forecasting, collection of data, its analysis and forecasting responsibilities lies with users, who have to put together other tools or software in order to produce a forecast. FaaS offers each of these responsibilities as a service, namely, External Data Collection Framework (EDCF), Internal Data Retrieval Framework (IDRF) and Forecast Generation Framework (FGF). FaaS Controller, being a composite service based on the above three, is responsible for coordinating activities between them.
These services are accessible through Economic Endpoint (EE) or Technical Endpoint (TE) that can be used by a remote client in order to obtain cost or perform a forecast, respectively. The use of Cloud Computing makes these services available over the network to be used as software to forecast energy for solar or wind resources. These services can also be used as a platform to create new services by merging existing functionality with new service features for forecasting. Eventually, this can lead to faster development of newer services where a user can choose which services to use and pay for, presenting the use of FaaS as Platform-as-a-Service (PaaS) in forecasting.
Advisors/Committee Members: Tam, Kwa Sur (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Microsoft Azure; Cloud Computing; Forecasting; Service-Oriented Architecture
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APA (6th Edition):
Sehgal, R. (2014). Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/25867
Chicago Manual of Style (16th Edition):
Sehgal, Rakesh. “Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting.” 2014. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/25867.
MLA Handbook (7th Edition):
Sehgal, Rakesh. “Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting.” 2014. Web. 21 Apr 2021.
Vancouver:
Sehgal R. Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting. [Internet] [Masters thesis]. Virginia Tech; 2014. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/25867.
Council of Science Editors:
Sehgal R. Service-Oriented Architecture based Cloud Computing Framework For Renewable Energy Forecasting. [Masters Thesis]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/25867
Virginia Tech
11.
Nazir, Mohammad Nawaf.
Control of Power Flow in Transmission Lines using Distributed Series Reactors.
Degree: MS, Electrical 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 April 21, 2021.
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. 21 Apr 2021.
Vancouver:
Nazir MN. Control of Power Flow in Transmission Lines using Distributed Series Reactors. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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
12.
Alvarez, Genesis Barbie.
Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/94627
► Reliable power supply from the electric grid is an essential part of modern life. This critical infrastructure can be vulnerable to cascading failures or natural…
(more)
▼ Reliable power supply from the electric grid is an essential part of modern life. This critical infrastructure can be vulnerable to cascading failures or natural disasters. A solution to improve power systems resilience can be through microgrids. A microgrid is a small network of interconnected loads and distributed energy resources (DERs) such as microturbines, wind power, solar power, or traditional internal combustion engines. A microgrid can operate being connected or disconnected from the grid. This research emphases on the potentially use of a Microgrid as a resiliency source during grid restoration to pick up critical load. In this research, controllers are designed to pick up critical loads (i.e hospitals, street lights and military bases) from the distribution system in case the electric grid is unavailable. This case study includes the design of a Microgrid and it is being tested for its feasibility in an actual integration with the electric grid. Once the grid is restored the synchronization between the microgrid and electric must be conducted. Synchronization is a crucial task. An abnormal synchronization can cause a disturbance in the system, damage equipment, and overall lead to additional system outages. This thesis develops various controllers to conduct proper synchronization. Interconnecting inverter-based distributed energy resources (DERs) such as photovoltaic and battery storage within the distribution system can use the electronic devices to improve power quality. This research focuses on using these devices to improve the voltage profile within the distribution system and the frequency within the Microgrid.
Advisors/Committee Members: Liu, Chen-Ching (committeechair), De La Reelopez, Jaime (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Distributed Energy Resources; Mixed-Integer Quadratic Programming; Microgrid; Volt/Var Optimization; Smart Inverters; Linear Quadratic Regulator
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APA (6th Edition):
Alvarez, G. B. (2019). Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/94627
Chicago Manual of Style (16th Edition):
Alvarez, Genesis Barbie. “Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/94627.
MLA Handbook (7th Edition):
Alvarez, Genesis Barbie. “Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System.” 2019. Web. 21 Apr 2021.
Vancouver:
Alvarez GB. Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/94627.
Council of Science Editors:
Alvarez GB. Control Design for a Microgrid in Normal and Resiliency Modes of a Distribution System. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/94627
Virginia Tech
13.
Zaremski, Brian Zachary.
The Advancement of Adaptive Relaying in Power Systems Protection.
Degree: MS, Electrical and Computer Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/32121
► The electrical distribution system in the United States is considered one of the most complicated machines in existence. Electrical phenomena in such a complex system…
(more)
▼ The electrical distribution system in the United States is considered one of the most complicated machines in existence. Electrical phenomena in such a complex system can inflict serious self-harm. This requires damage prevention from protection schemes. Until recently, there was a safe gap between capacity to deliver power and the demand. Therefore, these protection schemes focused on dependability allowing the disconnection of lines, transformers, or other devices with the purpose of isolating the faulted element. On some occasions, the disconnections made were not necessary. The other extreme of reliability calls for security. This aspect of reliability calls for the operation of the protective devices only for faults within the intended area of protection. There is a tradeoff here; where a dependable protection scheme will assuredly prevent damage, it is prone to unnecessary operation which can lead to cascading outages. Where a secure scheme will not operate unnecessarily, it is prone to pieces of the system becoming damaged when relays fail to operate properly. With microprocessor based relaying schemes, a hybrid reliability focus is attainable through adaptive relaying. Adaptive relaying describes protection schemes that adjust settings and/or logic of operations based on the prevailing conditions of the system. These adjustments can help to avoid relay miss-operation. Adjustments could include, but are not limited to, the logging of data for post-mortem analysis, communication throughout the system, as well changing relay parameters. Several concepts will be discussed, one of which will be implemented to prove the value of the new tools available.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Centeno, Virgilio A. (committee member), Conners, Richard W. (committee member).
Subjects/Keywords: Loadability; Fault; Rate of Change; Impedance; Current; Voltage; Adaptive Protection; Supervisory Zones
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APA (6th Edition):
Zaremski, B. Z. (2012). The Advancement of Adaptive Relaying in Power Systems Protection. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32121
Chicago Manual of Style (16th Edition):
Zaremski, Brian Zachary. “The Advancement of Adaptive Relaying in Power Systems Protection.” 2012. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/32121.
MLA Handbook (7th Edition):
Zaremski, Brian Zachary. “The Advancement of Adaptive Relaying in Power Systems Protection.” 2012. Web. 21 Apr 2021.
Vancouver:
Zaremski BZ. The Advancement of Adaptive Relaying in Power Systems Protection. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/32121.
Council of Science Editors:
Zaremski BZ. The Advancement of Adaptive Relaying in Power Systems Protection. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/32121
Virginia Tech
14.
Mertz, Christopher George.
Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data.
Degree: MS, Electrical Engineering, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/23289
► As the requirements to operate the electric power system become more stringent and operating costs must be kept to a minimum, operators and planners must…
(more)
▼ As the requirements to operate the electric power system become more stringent and operating costs must be kept to a minimum, operators and planners must ensure that power system models are accurate and capable of replicating system disturbances. Traditionally, load models were represented as static ZIP models; however, NERC has recently required that planners model the transient dynamics of motor loads to study their effect on the postdisturbance behavior of the power system. Primarily, these studies are to analyze the effects of fault-induced, delayed voltage recovery, which could lead to cascading voltage stability issues.
Genetic algorithms and constrained multivariable function minimization are global and local optimization tools used to extract static and dynamic load model parameters from postdisturbance data. The genetic algorithm's fitness function minimizes the difference between measured and calculated real and reactive power by varying the model parameters. The fitness function of the genetic algorithm, a function of voltage and frequency, evaluates an individual\'s difference between measured and simulated real and reactive power.
While real measured data was unavailable, simulations in PSS/E were used to create data, and then compared against estimated data to examine the algorithms' ability to estimate parameters.
Advisors/Committee Members: De La Ree Lopez, Jaime (committeechair), Phadke, Arun G. (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: load modeling; genetic algorithms; induction machines; PSS/E
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APA (6th Edition):
Mertz, C. G. (2013). Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/23289
Chicago Manual of Style (16th Edition):
Mertz, Christopher George. “Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data.” 2013. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/23289.
MLA Handbook (7th Edition):
Mertz, Christopher George. “Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data.” 2013. Web. 21 Apr 2021.
Vancouver:
Mertz CG. Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/23289.
Council of Science Editors:
Mertz CG. Utilization of Genetic Algorithms and Constrained Multivariable Function Minimization to Estimate Load Model Parameters from Disturbance Data. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/23289
Virginia Tech
15.
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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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 April 21, 2021.
http://hdl.handle.net/10919/78056.
MLA Handbook (7th Edition):
Mishra, Chetan. “Optimal Substation Coverage for Phasor Measurement Unit Installations.” 2012. Web. 21 Apr 2021.
Vancouver:
Mishra C. Optimal Substation Coverage for Phasor Measurement Unit Installations. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2021 Apr 21].
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
16.
Akbar, Yousef M. A. H.
Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters.
Degree: MS, Electrical Engineering, 2020, Virginia Tech
URL: http://hdl.handle.net/10919/98554
► The power grid is becoming more digitized and is utilizing information and communication technologies more, hence the smart grid. New systems are developed and utilized…
(more)
▼ The power grid is becoming more digitized and is utilizing information and communication technologies more, hence the smart grid. New systems are developed and utilized in the modernized power grid that directly relies on new communication networks. The power grid is becoming more efficient and more effective due to these developments, however, there are some considerations to be made as for the security of the power grid. An important expectation of the power grid is the reliability of power delivery to its customers. New information and communication technology integration brings rise to new cyber vulnerabilities that can inhibit the functionality of the power grid. A coordinated cyber-attack was conducted against the Ukrainian power grid in 2015 that targeted the cyber vulnerabilities of the system. The attackers made sure that the grid operators were unable to observe their system being attacked via Denial of Service attacks. Smart meters are the digitized equivalent of a traditional energy meter, it wirelessly communicates with the grid operators. An increase in deployment of these smart meters makes it such that we are more dependent on them and hence creating a new vulnerability for an attack. The smart meter integration into the power grid needs to be studied and carefully considered for the prevention of attacks. A testbed is created using devices that emulate the smart meters and a network is established between the devices. The network was attacked with a Denial of Service attack to validate the testbed performance, and an Intrusion detection method was developed and applied onto the testbed to prove that the testbed created can be used to study and develop methods to cover the vulnerabilities present.
Advisors/Committee Members: Liu, Chen-Ching (committeechair), Centeno, Virgilio A. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: Denial of Service (DoS); Advanced Metering Infrastructure (AMI); Wireless Mesh Network (WMN); Cyber-Physical System (CPS); Power Grid; Supervisory Control And Data Acquisition (SCADA); Cyber Security of Smart Meters
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Export
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APA (6th Edition):
Akbar, Y. M. A. H. (2020). Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/98554
Chicago Manual of Style (16th Edition):
Akbar, Yousef M A H. “Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters.” 2020. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/98554.
MLA Handbook (7th Edition):
Akbar, Yousef M A H. “Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters.” 2020. Web. 21 Apr 2021.
Vancouver:
Akbar YMAH. Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/98554.
Council of Science Editors:
Akbar YMAH. Intrusion Detection of Flooding DoS Attacks on Emulated Smart Meters. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/98554
Virginia Tech
17.
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 April 21, 2021.
http://hdl.handle.net/10919/32669.
MLA Handbook (7th Edition):
Fernandez, Javier Oscar. “The Virginia Tech Calibration System.” 2011. Web. 21 Apr 2021.
Vancouver:
Fernandez JO. The Virginia Tech Calibration System. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Apr 21].
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
18.
Jones, Kevin David.
Three-Phase Linear State Estimation with Phasor Measurements.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/32119
► Given the ability of the Phasor Measurement Unit (PMU) to directly measure the system state and the increasing implementation of PMUs across the electric power…
(more)
▼ Given the ability of the Phasor Measurement Unit (PMU) to directly measure the system state and the increasing implementation of PMUs across the electric power industry, a natural expansion of state estimation techniques would be one that employed the exclusive use of PMU data. Dominion
Virginia Power and the Department of Energy (DOE) are sponsoring a research project which aims to implement a three phase linear tracking state estimator on Dominionâ s 500kV network that would use only PMU measurements to compute the system state. This thesis represents a portion of the work completed during the initial phase of the research project. This includes the initial development and testing of two applications: the three phase linear state estimator and the topology processor. Also presented is a brief history of state estimation and PMUs, traditional state estimation techniques and techniques with mixed phasor data, a development of the linear state estimation algorithms and a discussion of the future work associate with this research project.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Ree Lopez, Jaime (committee member), Thorp, James S. (committee member).
Subjects/Keywords: linear state estimation; three phase; phasor measurements; state estimation; power systems; PMU
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APA (6th Edition):
Jones, K. D. (2011). Three-Phase Linear State Estimation with Phasor Measurements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32119
Chicago Manual of Style (16th Edition):
Jones, Kevin David. “Three-Phase Linear State Estimation with Phasor Measurements.” 2011. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/32119.
MLA Handbook (7th Edition):
Jones, Kevin David. “Three-Phase Linear State Estimation with Phasor Measurements.” 2011. Web. 21 Apr 2021.
Vancouver:
Jones KD. Three-Phase Linear State Estimation with Phasor Measurements. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/32119.
Council of Science Editors:
Jones KD. Three-Phase Linear State Estimation with Phasor Measurements. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/32119
Virginia Tech
19.
Vance, Katelynn Atkins.
Robust Control for Inter-area Oscillations.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/36313
► In order to reduce the detrimental effects of inter-area oscillations on system stability, it is possible to use Linear Matrix Inequalities (LMIs) to design a…
(more)
▼ In order to reduce the detrimental effects of inter-area oscillations on system stability, it is possible to use Linear Matrix Inequalities (LMIs) to design a multi-objective state feedback. The LMI optimization finds a control law that stabilizes several contingencies simultaneously using a polytopic model of the system. However, the number of cases to be considered is limited by computational complexity which increases the chances of infeasibility. In order to circumvent this problem, this paper presents a method for solving multiple polytopic problems having a common base case. The proposed algorithm determines the necessary polytopic control for a particular contingency and classifies the data as belonging to that polytopic domain. The technique has been tested on an 8-machine, 13 bus, system and has been found to give satisfactory results.
Advisors/Committee Members: Thorp, James S. (committeechair), De La Ree Lopez, Jaime (committee member), Centeno, Virgilio A. (committee member).
Subjects/Keywords: Polytopic Model; Adaptive Selection; Convex Combination; Inter-area Oscillations; Linear Matrix Inequality (LMI) Control
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APA (6th Edition):
Vance, K. A. (2011). Robust Control for Inter-area Oscillations. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/36313
Chicago Manual of Style (16th Edition):
Vance, Katelynn Atkins. “Robust Control for Inter-area Oscillations.” 2011. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/36313.
MLA Handbook (7th Edition):
Vance, Katelynn Atkins. “Robust Control for Inter-area Oscillations.” 2011. Web. 21 Apr 2021.
Vancouver:
Vance KA. Robust Control for Inter-area Oscillations. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/36313.
Council of Science Editors:
Vance KA. Robust Control for Inter-area Oscillations. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/36313
Virginia Tech
20.
Morton, Daniel David.
Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs).
Degree: MS, Electrical 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 April 21, 2021.
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. 21 Apr 2021.
Vancouver:
Morton DD. Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs). [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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.
Rajasekeran, Sangeetha.
Enabling Grid Integration of Combined Heat and Power Plants.
Degree: MS, Electrical Engineering, 2020, Virginia Tech
URL: http://hdl.handle.net/10919/99730
► Combined Heat and Power is a generation technology which uses a single fuel source to produce two useful outputs - electric power and thermal energy…
(more)
▼ Combined Heat and Power is a generation technology which uses a single fuel source to produce two useful outputs - electric power and thermal energy - by capturing and reusing the exhaust steam by-product. These generating units have much higher efficiencies than conventional power plants, lower fuel emissions and have been a popular choice among several industries and commercial buildings with a need for uninterrupted heat and power. With increasing calls for climate action and large scale deployment of renewable based energy generation sources, there is a higher need for reliable base-line generation which can handle the fluctuations and uncertainty of such renewables. This need can be met by CHP units owing to their geographic distribution and their high operating duration. CHPs also provide a myriad of other benefits for the grid operators and environmental benefits, compared to the conventional generators. However, unfavorable and inconsistent regulatory procedures have discouraged these facility owners from actively engaging in providing grid services. Therefore, it is imperative to look into some of the existing policies and understand where the changes and incentives need to be made. In this work, we look into methods that can ease CHP integration from a technological and an economic point of view, with the aim of encouraging grid operators and CHP owners to be more active participants.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), De La Reelopez, Jaime (committee member), Kekatos, Vasileios (committee member).
Subjects/Keywords: Flexible-CHP; Demand Response; Weighted Multi-Objective Optimization
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APA (6th Edition):
Rajasekeran, S. (2020). Enabling Grid Integration of Combined Heat and Power Plants. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99730
Chicago Manual of Style (16th Edition):
Rajasekeran, Sangeetha. “Enabling Grid Integration of Combined Heat and Power Plants.” 2020. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/99730.
MLA Handbook (7th Edition):
Rajasekeran, Sangeetha. “Enabling Grid Integration of Combined Heat and Power Plants.” 2020. Web. 21 Apr 2021.
Vancouver:
Rajasekeran S. Enabling Grid Integration of Combined Heat and Power Plants. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/99730.
Council of Science Editors:
Rajasekeran S. Enabling Grid Integration of Combined Heat and Power Plants. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99730
Virginia Tech
22.
Shrestha, Pratigya.
Inverter-based Control to Enhance the Resiliency of a Distribution System.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/93764
► With the increase in the renewable energy sources in the present grid, the established methods for the operation of the grid needs to be updated…
(more)
▼ With the increase in the renewable energy sources in the present grid, the established methods for the operation of the grid needs to be updated due to the changes that the large amount of renewable energy sources bring to the system. Due to the While the conventional resources in the power system was mainly synchronous generators that had an inherent characteristic for frequency support and regulation due to the inertia this characteristic can be lacking in many of the renewable energy sources that are usually inverter-based. At present, the commonly adapted function for the inverters is to follow the grid which is suitable in case of normal operation of the power system. However, during emergency scenarios when the utility is disconnected and a part of the system has to operate independently the inverters need to be able to regulate both the voltage and frequency on their own. In this project the inverter-based control, termed as the virtual synchronous generator, has been studied such that it mimics the well-established controls for the conventional generators so that the inverter-based renewable resource appears similar to the conventional generator from the point of view of the grid in terms of the electrical quantities. The utilization of this type of control for operation of a part of the feeder with each inverter-based resource controlling its output in a decentralized manner is studied. The controls try to mimic the established controls for conventional synchronous machine and use it for maintain operation of the system with inverters.
Advisors/Committee Members: Liu, Chen-Ching (committeechair), Centeno, Virgilio A. (committee member), De La Reelopez, Jaime (committee member).
Subjects/Keywords: Dynamic simulation; System-level models; Grid-forming inverters; Resiliency; Virtual Inertia
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APA (6th Edition):
Shrestha, P. (2019). Inverter-based Control to Enhance the Resiliency of a Distribution System. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93764
Chicago Manual of Style (16th Edition):
Shrestha, Pratigya. “Inverter-based Control to Enhance the Resiliency of a Distribution System.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/93764.
MLA Handbook (7th Edition):
Shrestha, Pratigya. “Inverter-based Control to Enhance the Resiliency of a Distribution System.” 2019. Web. 21 Apr 2021.
Vancouver:
Shrestha P. Inverter-based Control to Enhance the Resiliency of a Distribution System. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/93764.
Council of Science Editors:
Shrestha P. Inverter-based Control to Enhance the Resiliency of a Distribution System. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93764
Virginia Tech
23.
Abraham, Sherin Ann.
PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/90774
► Today, with significant technological advancements, as we proceed towards a modern grid, a mere change in physical infrastructure will not be enough. With the changes…
(more)
▼ Today, with significant technological advancements, as we proceed towards a modern grid, a mere change in physical infrastructure will not be enough. With the changes in kinds of equipment installed on the grid, a wave of transformation has also begun to flow in the planning and operation practices for a smarter grid. Today, the edge of the grid where the customer is interfaced to the power system has become extremely complex. Customers can use rooftop solar PV to generate their own electricity, they are more informed about their consumption behavior due to installation of smart meters and also have options to integrate other technology like battery energy storage system and electric vehicles. Like with any good technology, adoption of these advancements in the system brings with itself a greater need for reform in operation and planning of the system. For instance, increasing installation of rooftop solar at the customer end calls for review of existing methods that determine the maximum level of PV deployment possible in the network without violating the operating conditions. So, in this work, a comparative study is done to review the PV hosting capacity of a network with varying levels of information available. And the importance of utilities to have secondary network models available is emphasized. With PV deployed in the system, enhanced demand response strategies can be formulated by utilities to tackle high demand during peak period. In a bid to identify customers for participation in such programs, in this work, a computationally efficient strategy is developed to identify customers with high demand during peak period, who can be incentivized to participate in demand response programs. With this, a significant peak shaving can be achieved by the utility, and in turn stress on the distribution network is reduced during peak hours.
Advisors/Committee Members: Broadwater, Robert P. (committeechair), Centeno, Virgilio A. (committee member), De La Reelopez, Jaime (committee member).
Subjects/Keywords: Smart grid; AMI data clustering; PV hosting
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APA (6th Edition):
Abraham, S. A. (2019). PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90774
Chicago Manual of Style (16th Edition):
Abraham, Sherin Ann. “PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/90774.
MLA Handbook (7th Edition):
Abraham, Sherin Ann. “PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability.” 2019. Web. 21 Apr 2021.
Vancouver:
Abraham SA. PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/90774.
Council of Science Editors:
Abraham SA. PV Hosting Analysis and Demand Response Selection for handling Modern Grid Edge Capability. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90774
Virginia Tech
24.
Taheri Hosseinabadi, Sayedsina.
Direct-Current Power Flow Solvers and Energy Storage Sizing.
Degree: MS, Electrical engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/90227
► Power systems are undergoing major changes as more renewable energy resources are being deployed across their networks. Two of the major changes are the increase…
(more)
▼ Power systems are undergoing major changes as more renewable energy resources are being
deployed across their networks. Two of the major changes are the increase in direct-current
(DC) generation and loads and making up for the uncertainty introduced by these resources.
In this thesis, we have tackled these two important aspects; a DC power flow (PF) solver
and an energy storage system (ESS) sizing under uncertainty. The three DC PF solvers
proposed in this thesis exhibit complementary values and can handle a wide range of loads
and generation types. We have also proposed a distributionally robust ESS sizing under
model predictive control framework, capable of handling worst-case uncertainties.
Advisors/Committee Members: Kekatos, Vasileios (committeechair), Centeno, Virgilio A. (committee member), De La Reelopez, Jaime (committee member).
Subjects/Keywords: Power systems; Direct-Current Networks; Energy Storage; Power Flow
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APA (6th Edition):
Taheri Hosseinabadi, S. (2019). Direct-Current Power Flow Solvers and Energy Storage Sizing. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90227
Chicago Manual of Style (16th Edition):
Taheri Hosseinabadi, Sayedsina. “Direct-Current Power Flow Solvers and Energy Storage Sizing.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/90227.
MLA Handbook (7th Edition):
Taheri Hosseinabadi, Sayedsina. “Direct-Current Power Flow Solvers and Energy Storage Sizing.” 2019. Web. 21 Apr 2021.
Vancouver:
Taheri Hosseinabadi S. Direct-Current Power Flow Solvers and Energy Storage Sizing. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/90227.
Council of Science Editors:
Taheri Hosseinabadi S. Direct-Current Power Flow Solvers and Energy Storage Sizing. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90227
Virginia Tech
25.
Retty, Hema A.
Evaluation and Standardizing of Phasor Data Concentrators.
Degree: MS, Electrical and Computer Engineering, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/32064
► The power grid is interconnected in many ways; so that when disturbances occur in a small region, their effects can be seen across large areas…
(more)
▼ The power grid is interconnected in many ways; so that when disturbances occur in a small region, their effects can be seen across large areas causing major blackouts. In order to isolate the fault, measurements taken at different times throughout the blackout need to be collected and analyzed. With each measurement device having its own time source, time alignment can be a quite tedious and lengthy process. The need for a new time synchronized measurement device has arrived. The Phasor Measurement Units (PMU) is not only GPS time synchronized, but it also takes measurements as voltage and current phasors.
PMUs are becoming an integral part in many power system applications from load flow analysis and state estimation to analyzing blackout causes. Phasor Data Concentrators (PDC) collect and process PMU data. As such, it is important that PMU and PDC communication is seamless. PDCs are set up at multiple utilities and power authorities and also need to be able to communicate and send data to one another seamlessly to encompass analysis of large measurement systems. If these devices are not working similarly when processing and sending/receiving data, unnecessary problems may arise. Therefore it is important that there is an expectation as to how they should work. However, what is expected from these devices is not entirely clear. For this reason, standards such as IEEE C37.118.2-2011 [5] have been proposed to help make operation as uniform as possible. Unfortunately, the standards for PDCs are lacking and tend to only set up communication protocols. To help normalize PDCs, these standards need to be expanded to include all PDC operations and give little room for discrepancy as to what a PDC should do in any given situation. Tests have been performed on PDCs not only to see how they match up to current standards but on how they act outside of the standards.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), de la Ree Lopez, Jaime (committee member), Phadke, Arun G. (committee member).
Subjects/Keywords: Synchrophasor; Wide Area Measurements; Phasor Measurement Unit; IEEE C37.118; Phasor Data Concentrator
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APA (6th Edition):
Retty, H. A. (2013). Evaluation and Standardizing of Phasor Data Concentrators. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32064
Chicago Manual of Style (16th Edition):
Retty, Hema A. “Evaluation and Standardizing of Phasor Data Concentrators.” 2013. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/32064.
MLA Handbook (7th Edition):
Retty, Hema A. “Evaluation and Standardizing of Phasor Data Concentrators.” 2013. Web. 21 Apr 2021.
Vancouver:
Retty HA. Evaluation and Standardizing of Phasor Data Concentrators. [Internet] [Masters thesis]. Virginia Tech; 2013. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/32064.
Council of Science Editors:
Retty HA. Evaluation and Standardizing of Phasor Data Concentrators. [Masters Thesis]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/32064
Virginia Tech
26.
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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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 April 21, 2021.
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. 21 Apr 2021.
Vancouver:
Agrawal A. Performance of PV Generation Feedback Controllers: Power Factor versus Volt-VAR Control Strategies. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Apr 21].
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
Virginia Tech
27.
Bhela, Siddharth.
A Game-theoretic Framework to Investigate Conditions for Cooperation between Wind Power Producers and Energy Storage Operators.
Degree: MS, Electrical 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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Export
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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 April 21, 2021.
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. 21 Apr 2021.
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 2021 Apr 21].
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
28.
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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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 April 21, 2021.
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. 21 Apr 2021.
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 2021 Apr 21].
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
29.
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 April 21, 2021.
http://hdl.handle.net/10919/41229.
MLA Handbook (7th Edition):
Pal, Anamitra. “Coordinated Control of Inter-area Oscillations using SMA and LMI.” 2012. Web. 21 Apr 2021.
Vancouver:
Pal A. Coordinated Control of Inter-area Oscillations using SMA and LMI. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2021 Apr 21].
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
30.
Meyur, Rounak.
Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid.
Degree: MS, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/88795
► The modern day power system has been identified as a critical infrastructure providing crucial support to the economy of a country. Prior experience has shown…
(more)
▼ The modern day power system has been identified as a critical infrastructure providing
crucial support to the economy of a country. Prior experience has shown that a small failure
of a component in the power grid can lead to widespread cascading events and eventually
result in a blackout. Such failures can be triggered by devastating damage due to a natural
calamity or because of a targeted adversarial attack on certain points in the power system.
Given limited budget to avoid widespread cascading failures in the network, an important
problem would be to identify critical components in the power system. In this research
an attempt has been made to replicate the actual power system conditions as accurately
as possible to study the impact of a targeted adversarial attack on different points in the
network. Three heuristics have been proposed to identify critical nodes in the network
and their performance has been discussed. The case studies of cascading events have been
performed on a synthetic power system network of Washington DC to achieve the actual
system conditions of an operating power grid.
Advisors/Committee Members: Centeno, Virgilio A. (committeechair), Kekatos, Vassilis (committee member), Marathe, Madhav V. (committee member).
Subjects/Keywords: Cascading failures; targeted attack; hidden failures
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APA (6th Edition):
Meyur, R. (2019). Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/88795
Chicago Manual of Style (16th Edition):
Meyur, Rounak. “Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid.” 2019. Masters Thesis, Virginia Tech. Accessed April 21, 2021.
http://hdl.handle.net/10919/88795.
MLA Handbook (7th Edition):
Meyur, Rounak. “Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid.” 2019. Web. 21 Apr 2021.
Vancouver:
Meyur R. Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Apr 21].
Available from: http://hdl.handle.net/10919/88795.
Council of Science Editors:
Meyur R. Cascading Events in the Aftermath of a Targeted Physical Attack on the Power Grid. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/88795
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