University of Twente Student Theses


Significance of Non-Persistence on Waveform Parameters of Non-Linear Loads

Hegeman, Thomas (2022) Significance of Non-Persistence on Waveform Parameters of Non-Linear Loads.

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Abstract:In this thesis non-persistence is investigated for different non-linear loads and the effect it has on the waveform parameters. A waveform is non-persistent when the form differs from cycle to cycle. The waveform parameters are used to describe voltage and current in power quality, electromagnetic compatibility and research into faulty measurements of static electricity meters. Some commonly used parameters are investigated for non-persistence per cycle over one continuous minute. The different loads used were a dimmer, a water pump and a dimmed television. It was discovered that calculating the crest factor over multiple cycles could significantly increase the value compared to calculation over a single cycle. Using the IEC standard the found peak current could be 7% lower than the actual maximum value. The phase firing angle is the moment the current starts conducting and can be calculated for the positive and negative half, which could yield in different values. Based on the results an advise is given to check persistence, when working with parameters in non-linear loads.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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