Simple methods of voltage dip tracking– case study
The paper presents results of an experimental study of two methods of voltage dip tracking. The first is based on half cycle absolute
peak value monitoring, whereas the second is based on low-pass filtration of squares of voltage samples. Both methods are devised
for application in low-cost integrated circuits, dedicated to power quality monitoring. The two real voltage dips have been considered
for the aim. The results are compared with the reference method recommended in IEC Std. 61000-4-30, based on calculation of the
r.m.s. voltage refreshed each half cycle. Further, the application of the low-pass method for assessment small voltage variations is
considered, both short term (r.m.s. voltage refreshed each half cycle) and long term (r.m.s. voltage calculated over 10 cycles of voltage
fundamental component). The research confirmed sufficient accuracy of the method based on low-pass filtering for the class A of
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