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- W2377060443 abstract "Several common detecting techniques for voltage fluctuations such as swells,sags,flickers and harmonics are discussed.Classical and modern detecting techniques for them are analyzed,including zero-crossing PLL(Phase Locked Loop) and SPLL(Software PLL) in the phase locked method,and root mean square method,dq0 transformation method,improved window Fourier transformation as well as widely used wavelet transformation in the fluctuation character extraction.The merit and disadvantage of each algorithm are compared.The zero-crossing PLL i.e.hardware PLL,is comprised of PFD(Phase-Frequency Detector),loop filter,VCO(Voltage Control Oscillator) and frequency divider.It is really simple but poor in dynamic performance,and even worse in phase lock effect with distorted input voltage.Based on the instantaneous reactive power theory,the SPLL is simple,high speed and can exactly lock the fundamental positive sequence of source voltage,with strong suppression for harmonic and needless filter.Finally,detecting techniques for voltage fluctuation are concluded." @default.
- W2377060443 created "2016-06-24" @default.
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- W2377060443 date "2007-01-01" @default.
- W2377060443 modified "2023-09-23" @default.
- W2377060443 title "Detection methods for dynamic voltage quality" @default.
- W2377060443 hasPublicationYear "2007" @default.
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