DocumentCode :
3102722
Title :
Dynamic Phasor Measurement Unit Test System
Author :
Stenbakken, Gerard ; Zhou, Ming
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD
fYear :
2007
fDate :
24-28 June 2007
Firstpage :
1
Lastpage :
8
Abstract :
This paper presents the plans and progress towards the development of a dynamic phasor measurement unit (PMU) performance test system at NIST. We describe an algorithm for taking time-synchronized samples of single-phase voltage and current power signals and calculating their dynamic parameters, in particular the signal magnitude, phase, frequency, and rate of change of frequency that a PMU reports. PMUs must time stamp their values at periodic Coordinated Universal Time (UTC) markers called the update times. Thus, to provide a reference for PMU testing the sampled data can be fit to a model to define the value of a dynamic parameter at a specific time. The analysis model proposed in this paper assumes that the dynamic magnitude and frequency parameters of the signals are constant over the sampling interval analyzed. This analysis interval is usually the same as the update period or an integer multiple of that period. In the proposed analysis model the dynamic magnitude and frequency parameters are considered a polynomial in time about the update times. The order of the polynomial can be adjusted in a way that meets the needs of the signal being analyzed, yet minimizes the computational effort and sensitivity to noise. We show that when the dynamic variations are analyzed in this way, a single matrix can be used to iteratively converge on a good estimate of the dynamic frequency and magnitude parameters. The polynomial model can be used to generate and analyze test signals. Several test patterns are proposed, which include linearly changing magnitudes or frequencies. As expected, during low voltage tests of the system, the analysis does very well when the generation model matches the analysis model. Several other generation models are also proposed, such as sine waves or damped sine waves. The proposed analysis model is shown to be very accurate in these cases as well.
Keywords :
matrix algebra; phase measurement; power grids; power system measurement; power system reliability; synchronisation; coordinated universal time markers; current power signals; dynamic phasor measurement unit test system; frequency parameters; low voltage tests; polynomial model; power system reliability; single matrix; single-phase voltage; time-synchronized samples; Frequency estimation; Global Positioning System; Phasor measurement units; Polynomials; Power system dynamics; Power system interconnection; Power system modeling; Power systems; Signal analysis; System testing; Global Positioning System; PMU; calibration; dynamic measurement; electric power grid; phase measurement; power system reliability; synchronization; time-synchronized metrology;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Engineering Society General Meeting, 2007. IEEE
Conference_Location :
Tampa, FL
ISSN :
1932-5517
Print_ISBN :
1-4244-1296-X
Electronic_ISBN :
1932-5517
Type :
conf
DOI :
10.1109/PES.2007.386139
Filename :
4275905
Link To Document :
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