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 Wysłany: Śro 17:55, 08 Gru 2010 Temat postu: ugg boots billig Dual-rate synchronous sampling me |
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Dual-rate synchronous sampling method in power system harmonic measurement
Rate method, especially in the high harmonics, the relative error of dual-rate method than the single rate for small l ~ 2 orders of magnitude. Thus,[link widoczny dla zalogowanych], dual-rate method can effectively reduce the measurement error. 5 Conclusion The dual-rate synchronous sampling method used in measurement of harmonics by the simulation test proved to be effective, it is ordinary compared to single-rate sampling. Solve the impact of truncation error is not only increasing complexity of software processes, and therefore more reflected in its practicality. Of course, due to the rotation factor changes,[link widoczny dla zalogowanych], it can not use the symmetry with the rapid rate of DFT algorithm (FFT). This is its disadvantage, but for the power systems, due to its lower frequency, small sampling point during the week, FFT did not significantly improve the speed, so this method is still a good software synchronous sampling method. 154 measurement of April 1999 1002880.00790.000400004003090.03360.02810.013730. o2660.08500.003000034028690.2335026000.126550.78690.0948000990.0010084990.1149076760.141871.71120.15990021000 mouth 101.87500.1034166610.181393.36090.152500396003963.67340.12363.26590.18480.02510.23240.68381. 47812.8772003870.15910.27800.140100943117.01880.19590.07730.07727.76050.2187679880.07155.919901642 odd and even harmonic order of Mono Mono Mono Mono atlanto 349.0 - 51.0Hz same sampling starting point for the simulation results of voltage measurements (%)(~= 50, = 0.3, t) in Reference 1 Day before. Quasi-synchronous sampling and non-sinusoidal power measurement. Scientific Instrument,[link widoczny dla zalogowanych], 1984; 5 (4) 390--3962 Fangwei Lin. Wang meritorious. Double-speed synchronous sampling method in the measurement of AC Electrical Measurement & Instrumentation. 1997; 34 (4): 21 ~ 233 in the first wearing. Tang reunification. Harmonic analysis of periodic signal a new approach INSTRUMENT. 1989210 (3) :248 --2,554 Ma Hongzhong, Hu Qian-sheng software synchronous sampling error of China Electrotechnical Society. 1996; 11 (1) :43 - 475XiJiangtao, ChicheiroJF. Anff, ~ 7algorithmforimp ~ mgtheaccuracyperiodics ~ gnalanalysis. IEEETrans1996; IM. 45 (4): 827 ~ 830 20 No. 2 Zhou Jun et al: Two-speed synchronous mixed method adopted in the power system harmonic measurement 155ApplicationofDouble ・ SpeedSynchronousSamplinginthePowerSystemHarmonicMeasurementZhouJun, LiXiaowen,[link widoczny dla zalogowanych], Sheng-'fan (ElectricEngineeingDepartment, HtmanUniversity, Changsha410082) Abstrct-a Inthispaper. thedouble-speeds ~ chmnomsamplingmethodisintroducedtothepowersystemharmonicmeasurement,[link widoczny dla zalogowanych], andthecorrespondingalgprithmmodelofDFTisde-duced. Theresultofsimulationshowsthatthisalgorithmgivesahigheraccuracythansingle-speedsynchronoussamplingmethod. Keywords: Double-speedsynchronoussampling; Harmonic; DFT
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