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000000052 001__ 52
000000052 037__ $$aENY-ARTICLE-2008-043
000000052 041__ $$aeng
000000052 088__ $$adoi:10.1109/TIM.2007.908250
000000052 100__ $$aLeonowicz, Z
000000052 245__ $$aTime-Frequency Analysis of Complex Space-Phasor in Power Electronics
000000052 260__ $$c2007-12-21
000000052 300__ $$a9p
000000052 500__ $$aIEEE Trans. on Instrumentation and Measurement, Vol. 56, No. 6, Dec 2007, pp. 2395-2403
000000052 520__ $$aThis paper considers applying nonparametric and parametric methods for the calculation of the time–frequency representation of nonstationary signals in power electronics. A space phasor is proposed as a complex representation of a three-phase signal to calculate the spectrum of positive- and negative-sequence components. The developed methods are tested with nonstationary multiple-component signals occurring during the fault operation of inverter-fed drives. First, the main differences between parametric and nonparametric methods are underlined. Then, some aspects of additional kernel functions are introduced on the basis of Wigner and Choi–Williams distributions. An additional comparison of uncertainty of measurements using the described methods, as well as a widely used Fourier technique, can be useful for practitioners. The proposed methods allow tracking instantaneous frequency as well as magnitude that can can lead to applications in the diagnosis and power quality areas.
000000052 6531_ $$aEstimation
000000052 6531_ $$ameasurement errors
000000052 6531_ $$apower electronics
000000052 6531_ $$apower system harmonics
000000052 6531_ $$atime–frequency analysis
000000052 700__ $$aLobos, T
000000052 700__ $$aSikorski, T
000000052 8560_ $$fzbigniew.leonowicz@pwr.wroc.pl
000000052 8564_ $$uhttp://zet10.ipee.pwr.wroc.pl/record/52/files/$$zAccess to Fulltext
000000052 909CO $$ooai:zet10.pwr.wroc.pl:52$$pglobal
000000052 980__ $$aARTICLE