DWT analysis of high order harmonics influence over distorted regimes with fast variable loads

Nicolae, Ileana-Diana; Nicolae, Petre-Marian; Smarandescu, Ionut Daniel

doi:10.1109/isemc.2015.7256148

Cited by 2 publications

(6 citation statements)

References 5 publications

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“…These should also be correlated to analysis of harmonics for frequencies higher than 2(3) kHz. Modern methods for analysis in time-frequency domains (e.g., using wavelets) should be employed as well, as long as domain of applicability is wider than that of traditional Fourier analysis and can offer additional information [22].…”

Section: Discussionmentioning

confidence: 99%

“…step voltage transformer 220/110 V a.c. (Figure 1b) [23,22]. The transformers were designed and manufactured special for these applications in toroidal forms (they are linear transformers without ferromagnetic core and consequently without saturation).…”

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

“…Consumers' behavior during the supplying with (110-220) V a.c. presented interest for authors. Laptops fall into this category as long as their supplying voltages are within this range of values whilst accepting 2 operational frequencies (50/60 Hz) [22]. In this paper, only one phase of the three-phase system was used (Figure 1b).…”

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

“…Because we were interested in analyzing this range, we have extended the analyzed frequency range up to a sampling frequency of 80 kHz. This could be achieved only if data were acquired from a single channel by using a DAS, which was specifically designed and manufactured for the applications studied in this paper-Figure 1 [16,22]. The measurement set-up was designed to allow the testing of one or more connected laptops on the phases of a three-phase system (Figure 1a,b).…”

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

“…The measurement set-up was designed to allow the testing of one or more connected laptops on the phases of a three-phase system (Figure 1a,b). The studied three-phase consumer is supplied with phase a.c. voltages of 220 V and line a.c. voltages of 380 V, by means of a down-step voltage transformer 220/110 V a.c. (Figure 1b) [22,23]. The transformers were designed and manufactured special for these applications in toroidal forms (they are linear transformers without ferromagnetic core and consequently without saturation).…”

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

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Power Quality and Electromagnetic Compatibility Aspects at Personal Computers

Nicolae

2022

Energies

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In this article, issues related to electromagnetic compatibility and energy/power quality for a laptop are addressed. Power quality problems are outlined. Testing frameworks (developed by authors) are presented and discussed for a laptop when two different sampling frequencies are used: 80 kHz and 19.2 kHz. Waveforms corresponding to the voltage across the laptop’s terminals and current absorbed by it were acquired. Recordings and numerical processing, based on original software using Fast Fourier Transform, are discussed, and the analysis of waveforms in both cases is performed. Various power quality indices were calculated. Theoretical and practical aspects related to the determination of power quantities, power flows, and power factor are presented. Some conclusions concerning different ranges of frequencies are presented, along with some considerations for power quality problems. Tests for conducted emissions (single phase and neutral wire respectively) and for the radiated emissions (for horizontal and vertical polarizations) are presented. Comparisons to the emission standards were made. The immunity behavior for a laptop is discussed according to immunity standards. It is shown that new measures (e.g., active filters) are necessary for network protection when connecting a laptop to the network. Some considerations, based on the authors’ observations concerning new standards for power quality and electromagnetic compatibility, are outlined.

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Section: Discussionmentioning

confidence: 99%

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

Section: Some Considerations Concerning Power Qualitymentioning

confidence: 99%

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Power Quality and Electromagnetic Compatibility Aspects at Personal Computers

Nicolae

2022

Energies

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Time-domain measurement technique to analyze cyclic short-time interference in power supply networks

Setiawan

Keyer

Azpúrua

et al. 2016

2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC)

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Conducted interference caused by equipment connected to power supply networks, and the interference in these networks, is conventionally measured using (slow) scanning tuned electromagnetic interference (EM!) receivers. A voltage sensor which separates common mode and differential mode in a three phase setup combined with a 8-channel digital oscilloscope allows measuring voltage and current via many samples in the three phases plus neutral. Using fast fourier transform for the data processing the conventional amplitude-as-function-of-frequency plots, similar to what would be obtained using conventional EM! receivers, can be generated. But with the presented measurement technique it is also possible to present time-frequency plots in a waterfall diagram. The tim e -d 0 m a i n measurement te c h n i que show s that the conducted noise is cyclic short-time interference.

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DWT analysis of high order harmonics influence over distorted regimes with fast variable loads

Cited by 2 publications

References 5 publications

Power Quality and Electromagnetic Compatibility Aspects at Personal Computers

Power Quality and Electromagnetic Compatibility Aspects at Personal Computers

Time-domain measurement technique to analyze cyclic short-time interference in power supply networks

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