Thesis
Synchrophasor time skew: formulation, detection and correction
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/101677
Abstract
The most critical part of the synchrophasor technology is the availability of accurate UTC time. Usually an external GPS clock device feeds PMU with 1 pulse per second time signals. During the second, PMU's internal clock keeps the pace until the next time signal arrives. Because of various reasons, time skews have been observed in some real life synchrophasor data. Two fundamental types of time skews are identified and formulated in this thesis. It is also recognized that synchrophasor time skew problem is fundamentally different from that in SCADA systems. In SCADA systems, time skew simply means time shift, because all measurements are scalar values. However, synchrophasor data with time skew could have huge errors because time shift is translated into error in phase angle measurements and subsequent errors in frequency and rate of change of frequency measurements. Algorithms are developed to automatically detect time skews online and to estimate the time errors. A correction method is also provided. Both simulated data and real life data are used to verify that the proposed methods are effective and accurate.
Metrics
24 File views/ downloads
15 Record Views
Details
- Title
- Synchrophasor time skew
- Creators
- Qiang Zhang
- Contributors
- Vaithianathan Venkatasubramanian (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525281401842
- Language
- English
- Resource Type
- Thesis