Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"frequency disturbance"”.
-
Printed Circuit Board Design for Frequency Disturbance Recorder
The FDR (Frequency Disturbance Recorder) is a data acquisition device for the power system. The device is portable and can be used with any residential wall outlet for frequency data collection. Furthermore, the FDR transmits calculated frequency data to the web for access by authorized users via …
-
Next Generation Frequency Disturbance Recorder Design and Timing Analysis
… a more cost effective solution for synchronized frequency measurements, the Frequency Monitoring Network (FNET) was developed and introduced by the Power IT laboratory at Virginia Tech. The FNET is comprised of many Frequency Disturbance Recorders (FDR) geographically distributed throughout the …
-
Synchronized Measurements And Applications During Power System 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 measurement errors, and large frequency …
-
Conditioning of FNET Data and Triangulation of Generator Trips in the Eastern Interconnected System
Using data from the frequency disturbance recorders (FDRs) that comprise the nation-wide frequency monitoring network known as FNET, disturbances in the eastern interconnected system (EI) have been monitored and recorded over the past several years. Analysis of this and other data by a wide variety …
-
Frequency Monitoring Network (FNET) Algorithm Improvements and Application Development
… Based real-time GPS synchronized wide-area Frequency Monitoring Network (FNET) is an extremely low cost and quickly deployable wide-area frequency measurement system with high dynamic accuracy which consists of Frequency Disturbance Recorder (FDR) distributed to more than 100 places around …
-
New Methods for Synchrophasor Measurement
… grid stability in real-time. A power system Frequency Monitoring Network (FNET) was first proposed in 2001 and was established in 2004. As a pioneering WAMS, it serves the entire North American power grid through advanced situational awareness techniques, such as real-time event alerts, …
-
Transient verification of generic wind turbine models
… single machine infinite bus systems and two-bus frequency disturbance injections. This thesis is organized as follows: Chapter 1 provides the reader an introduction to wind turbine generic models, as well as details about each of the four model types; Chapter 2 outlines in detail the verification …
-
Distribution system analysis using local-area voltage measurements
… many of the commercially available PMUs is the Frequency Disturbance Recorder (FDR), which measures voltage at the 120 V-outlet level. This research proposes using the voltage information obtained from FDRs to validate the benefits of installing PMUs at the distribution level; the work has …
-
Wide Area Power System Monitoring Device Design and Data Analysis
The frequency disturbance recorder (FDR) is a cost effective data acquisition device used to measure power system frequency at the distribution level. FDRs are time synchronized via the global positioning system (GPS) timing and data recorded by FDRs are time stamped to allow for comparative …
-
Next Generation Design of a Frequency Data Recorder Using Field Programmable Gate Arrays
The Frequency Disturbance Recorder (FDR) is a specialized data acquisition device designed to monitor fluctuations in the overall power system. The device is designed such that it can be attached by way of a standard wall power outlet to the power system. These devices then transmit their …
-
Power Systems Frequency Dynamic Monitoring System Design and Applications
… blackout is lack of wide area information. Frequency dynamics is one of the most important parameters of an electrical power system. In order to understand power system dynamics effectively, accurately measured wide-area frequency is needed. The idea of building an Internet based real-time …
-
Distributed Grid Analytics Platform (DGAP) for power grid monitoring at the distribution level
… and less costly PMUs are desired. In 2000, frequency disturbance recorders (FDRs), which are single-phase PMUs that monitor the power grid at the 120 V distribution level, were operated for the Frequency monitoring Network (FNET) project by Virginia Tech and the University of Tennessee. …
-
Peak-ratio analysis method for enhancement of LOM protection using M class PMUs
… technique is based on a Rate of Change of Frequency (ROCOF) measurement from M-class PMUs, but the key novelty of the method lies in the fact that it employs a new 'peak-ratio' analysis of the measured ROCOF waveform during any frequency disturbance to determine whether the …
-
High Accuracy Real-time GPS Synchronized Frequency Measurement Device for Wide-area Power Grid Monitoring
Frequency dynamics is one of the most important signals of a power system, and it is an indicator of imbalance between generation and load in the system. The Internet-based real-time GPS-synchronized wide-area Frequency Monitoring Network (FNET) was proposed to provide imperative frequency dynamics …
-
Control of sound transmission into payload fairings using distributed vibration absorbers and Helmholtz resonators
… sound transmission into payload fairing at low frequency is investigated. This new solution is composed of optimally damped vibration absorbers (DVA) and optimally damped Helmholtz resonators (HR). A fully coupled structural-acoustic model of a composite cylinder excited by an external plane …
-
Modal Analysis Techniques in Wide-Area Frequency Monitoring Systems
The advent of synchronized wide-area frequency measurements obtained from frequency disturbance recorders and phasor measurement units has presented the power industry with special opportunities to study power system dynamics. I propose the use of wide-area frequency measurements in identifying …
-
High-efficiency Transformerless PV Inverter Circuits
… topologies, which eliminate the traditional line frequency transformers to achieve lower cost and higher efficiency, and maintain lower leakage current as well. With an overview of the state-of-the-art transformerless PV inverters, a new inverter technology is summarized in the Chapter 2, which is …
-
Drivers of change in the North American electric grid
… being pursued in relation to electromechanical disturbance propagation, which is caused by an imbalance in power supply and demand at any location of an electric grid. The delay associated with this phenomenon is generally observed in large-scale interconnected power systems, and the impact of …