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Mathematical Problems in Engineering
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2014
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Article
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Fig 7
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Research Article
PLL Based Digital Adaptive Filter for Detecting Interharmonics
Figure 7
The signal,
, under multiple disturbances; (a) +2.5 Hz-frequency change, (b) 20%-voltage sag and 40°-phase shifting, and (c) multizero crossing.
(a)
(b)
(c)