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Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs)
(Virginia Tech, 2015-05-11)
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 ...
Digital Implementation of Power System Metering and Protection
(Virginia Tech, 2015-01-17)
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 ...
Examination of Power Systems Solutions Considering High Voltage Direct Current Transmission
(Virginia Tech, 2015-10-05)
Since the end of the Current Wars in the 19th Century, alternating current (AC) has dominated the production, transmission, and use of electrical energy. The chief reason for this dominance was (and continues to be) that ...
Synchronized Measurement of Machine Rotor Angle and Its Application
(Virginia Tech, 2015-01-31)
The internal voltage angle of a generator is an important parameter that indicates the stability, both transient and steady-state, of the generator. This paper proposes a method of measuring and synchronizing the internal ...
Thesis PMU Applications Prioritization Based in Wide Area Disturbance Events
(Virginia Tech, 2015-01-31)
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 ...
A New Method of Determining the Transmission Line Parameters of an Untransposed Line using Synchrophasor Measurements
(Virginia Tech, 2015-09-10)
Transmission line parameters play a significant role in a variety of power system applications. The accuracy of these parameters is of paramount importance. Traditional methods of determining transmission line parameters ...