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PMU-Based ROCOF Measurements: Uncertainty Limits and Metrological Significance in Power System Applications.
- Source :
-
IEEE Transactions on Instrumentation & Measurement . Oct2019, Vol. 68 Issue 10, p3810-3822. 13p. - Publication Year :
- 2019
-
Abstract
- In modern power systems, the Rate-of-Change-of-Frequency (ROCOF) may be largely employed in Wide Area Monitoring, Protection, and Control (WAMPAC) applications. However, a standard approach toward ROCOF measurements is still missing. In this paper, we investigate the feasibility of Phasor Measurement Units (PMUs) deployment in ROCOF-based applications, with a specific focus on Under-Frequency Load-Shedding (UFLS). For this analysis, we select three state-of-the-art window-based synchrophasor estimation algorithms and compare different signal models, ROCOF estimation techniques, and window lengths in datasets inspired by real-world acquisitions. In this sense, we are able to carry out a sensitivity analysis of the behavior of a PMU-based UFLS control scheme. Based on the proposed results, PMUs prove to be accurate ROCOF meters, as long as the harmonic and interharmonic distortion within the measurement pass-bandwidth is scarce. In the presence of transient events, the synchrophasor model loses its appropriateness as the signal energy spreads over the entire spectrum and cannot be approximated as a sequence of narrow-band components. Finally, we validate the actual feasibility of PMU-based UFLS in a real-time simulated scenario where we compare two different ROCOF estimation techniques with a frequency-based control scheme, and we show their impact on the successful grid restoration. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189456
- Volume :
- 68
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Instrumentation & Measurement
- Publication Type :
- Academic Journal
- Accession number :
- 138733431
- Full Text :
- https://doi.org/10.1109/TIM.2019.2907756