Global ETD Search
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Showing 1 to 16 of 16 for “"synchronized measurements"”.
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Synchronized Measurements And Applications During Power System Dynamics
Synchronized phasor measurements during dynamics tend to be affected by prevailing system frequency. Some major blackouts in power systems are indeed featured with very large frequency disturbance. Quantitative study done in this dissertation shows that small frequency disturbance may lead to …
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Assessment of Cyber Vulnerabilities and Countermeasures for GPS-Time Synchronized Measurements in Smart Grids
We aim at expanding the horizon of existing research on cyberattacks against the time-syncrhonized devices such as PMUs and PDCs, along with corresponding countermeasures. We develop a PMU-PDC cybersecurity testbed at Virginia Tech Power and Energy Center (PEC) lab. The testbed is able to simulate …
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Phasor Measurement Units Applications Prioritization Based on Wide-Area Disturbance Events
… 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 …
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Voltage Stability Analysis Using Simulated Synchrophasor Measurements
… Significant research have been focused on time-synchronized measurements of power systems which can be used to frequently determine the state of a power system and can lead to a more robust protection, control and operation performance. This thesis discusses the applicability of two voltage …
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One millimeter for man, one meter for mankind: establishing millimeter wave radar as a ubiquitous sensor in consumer applications
… only RGB-D (color and depth) aligned but also synchronized with inertial measurement unit (IMU) measurements in the presence of ego-motion. Moreover, having time-synchronized measurements allow for verification, automated or assisted labelling of the radar data, and opens the door for novel …
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Development and implementation of an open-box distribution-level phasor measurement unit
… monitoring three-phase power. They provide synchronized measurements from any location where devices are installed. This synchronization is due to the micro-second Global Positioning System (GPS) time accuracy and is necessary for data to have meaning when compared across different …
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A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements
… which the parameter values are calculated using synchronized voltage and current measurements from both ends of a transmission line. One of the biggest problems facing the synchronized measurement method is line transposition. Several methods have been proposed that demonstrate how the line …
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Real-time power system topology change detection and identification
… is model-free, and exploits the high-speed synchronized measurements provided by phasor measurement units (PMUs). In this framework, a statistical quickest change algorithm is applied to the voltage phase angle measurements collected from PMUs to detect the change-point that corresponds to …
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Measurement-based tools for power system monitoring and operations
… and operations tools that leverage real-time measurements with little or no reliance on models obtained offline. Instead of relying on offline models, which can be grossly inaccurate, as in conventional power system monitoring and operations, the proposed methods exploit high-speed …
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Line and Generator Outage Identification using Synchrophasor Measurements
… adoption of phasor measurement units (PMUs), synchronized measurements with high temporal resolution provide new opportunities for event detection and identification in electric power systems. This thesis focuses on two types of outages: line and generator outages. For line outages, an …
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Load Modeling using Synchrophasor Data for Improved Contingency Analysis
… the power system allows us to take advantage of synchronized measurements at a high data rate. These devices are capable of changing the way we manage online security within the Energy Management System (EMS) and can enhance our offline tools. This type of data helps us redevelop the …
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State and parameter estimation of power systems using phasor measurement units as bilinear system model
… realization of smart grids. PMUs can give synchronized measurements of voltage and current phasors from the grid, however their placement and maintenance could be daunting task based on their cost and the size of the grid. Hence various optimization techniques have been used to solve …
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Modeling and estimation for non-invasive monitoring of intracranial pressure and cerebrovascular autoregulation
… cycle, from non- or minimally-invasive time-synchronized measurements of arterial blood pressure and cerebral blood flow velocity in a major cerebral artery. In the first step, our approach exploits certain features of cerebrovascular physiology, along with model reduction ideas, to deduce a …
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Next Generation Frequency Disturbance Recorder Design and Timing Analysis
In recent years, the subject of wide-area synchronized measurements has gained a significant amount of attention from the power system researchers. All of this started with the introduction of the Phasor Measurement Unit (PMU), which added a new perspective in the field of wide-area measurement …
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A predictive out-of-step protection scheme based on PMU enabled distributed dynamic state estimation
… to conventional metering devices. PMUs provide synchronized measurements, where synchronization is achieved via a GPS clock which provides the synchronizing signal with accuracy of 1 μsec. As a result, the computed phasors have a common reference (UTC time) and can be used in local computations, …
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Enhancing Grid Reliability With Phasor Measurement Units
… units (PMUs), which enable generating time-synchronized measurements with high sampling frequency, and pave a new path to realize real-time monitoring and control in power grids. However,the massive data generated by PMUs raises the questions of how to efficiently utilize the obtained …