Interharmonic-Flicker Curves

Tayjasanant, Thavatchai; Wang, Wencong; Li, Chun; Xu, Wilsun

doi:10.1109/tpwrd.2004.838639

Cited by 83 publications

(31 citation statements)

References 5 publications

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“…A careful analysis of the flickermeter algorithm reveals that the problem is caused by the band-pass filter of Block 3 or by the squaring function of Block 2 of the IEC flickermeter. The filter eliminates the DC and high frequency components since it is judged that human brains are not sensitive to those frequencies [8], [9]. Figure 3 summarizes a schematic diagram of flicker experimental setup developed to investigate the poor correlation between measured flicker level and user complaint under interharmonics in three different types of lamps, as follows:…”

Section: A Theoretical Analysismentioning

confidence: 99%

“…Due to the simple model of such lamp, different manufactures will have similar flicker response. Moreover, such lamp is more sensitive to rms voltage fluctuation [9]; Compact fluorescent lamp (CFL): The compact fluorescent lamp comprises five blocks: AC filter, rectifier, DC filter, inverter and the light bulb [23]. In this work, a popular model with electronic ballast to represent the great part of the compact fluorescent lamp was used.…”

Section: B Laboratorial Analysismentioning

confidence: 99%

“…In this work, a popular model with electronic ballast to represent the great part of the compact fluorescent lamp was used. Such lamp present similar flicker response to other ones and they are more sensitive to peak voltage fluctuation [9]. It is worthwhile to highlight that light output from fluorescent lamps is mainly determined by power applied to them, because the arc discharging power provided by an ac ballasting circuit tends to cause the cyclic variation and thus lead to fluctuation in light output [29] The system as shown in Figure 3 …”

Section: B Laboratorial Analysismentioning

confidence: 99%

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A Proposal for Flicker Evaluation

Junior¹,

Macedo²,

Delaiba³

2014

Eletrônica de Potência

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-The measured flicker levels by using the IEC standard 61000-4-15 often far exceed the established compatibility levels, even without the existence of consumer complaints. The poor measurement/complaint correlation due to the use of IEC flickermeter can be explained by two significant hypotheses. Firstly, modern lightning may be significantly less sensitive to voltage fluctuations than standard incandescent lamps upon which the entire IEC flickermeter concept is based. As a result, the luminous flux density (illuminance) variation from modern lamp bulbs is not well represented by the IEC flickermeter. Furthermore, the IEC standard 61000-4-15 is not able to detect flicker caused by high interharmonics components. In this connection, the flicker severity index measured by the IEC flickermeter to evaluate the flicker effect in modern lamp bulbs is controversial. Thus, would be the flicker planning levels and flicker requirements adequate to this scenario? This work presents a method to evaluate the flicker effect by taking into account the direct response of the illuminance variation. The test results have indicated a better correlation between measured flicker level and user complaint for all lamps tested in this study.

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Section: A Theoretical Analysismentioning

confidence: 99%

Section: B Laboratorial Analysismentioning

confidence: 99%

Section: B Laboratorial Analysismentioning

confidence: 99%

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A Proposal for Flicker Evaluation

Junior¹,

Macedo²,

Delaiba³

2014

Eletrônica de Potência

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“…Power quality issues in microgrid mainly include voltage and current harmonics, voltage sags, voltage swells, voltage short interruptions, voltage fluctuations and flickers, voltage and current unbalance components and so on [1][2][3][4]. Due to the traits of distributed sources the harmonics and inter-harmonics in microgrid may be abundant.…”

Section: Introductionmentioning

confidence: 99%

Hilbert-Huang transform with adaptive waveform matching extension and its application in power quality disturbance detection for microgrid

Gao

et al. 2016

J. Mod. Power Syst. Clean Energy

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With the significant improvement of microgrid technology, microgrid has gained large-scale application. However, the existence of intermittent distributed generations, nonlinear loads and various electrical and electronic devices causes power quality problem in microgrid, especially in islanding mode. An accurate and fast disturbance detection method which is the premise of power quality control is necessary. Aiming at the end effect and the mode mixing of original Hilbert-Huang transform (HHT), an improved HHT with adaptive waveform matching extension is proposed in this paper. The innovative waveform matching extension method considers not only the depth of waveform, but also the rise time and fall time. Both simulations and field experiments have verified the correctness and validity of the improved HHT for power quality disturbance detection in microgrid.

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“…These negative effects damage the lifetime of the machine and reduce the transformer availability and reliability. [8], [9], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Interharmonics Power Losses Estimation in Power Transformer fed High Power Cycloconverter Drive

Martín

Pontt

Bello

et al. 2008

2008 IEEE Industry Applications Society Annual Meeting

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High power cycloconverter (CCV) fed drives are widely used in mining plants for ore processing. Actually, transformers for CCV are manufactured under IEEE Standards for rectifier power transformers, considering harmonics losses only. However, when the drive operates at full power and variable speed, interharmonics currents can cause additional losses and overheating. In this work, the analysis of an actual CCV-drive with experimental measurements is presented, including a model for estimation of the interharmonic losses, considering the most relevant spectral components around the fundamental component. These losses are relevant and new considerations for transformer design are proposed.

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Interharmonic-Flicker Curves

Cited by 83 publications

References 5 publications

A Proposal for Flicker Evaluation

A Proposal for Flicker Evaluation

Hilbert-Huang transform with adaptive waveform matching extension and its application in power quality disturbance detection for microgrid

Interharmonics Power Losses Estimation in Power Transformer fed High Power Cycloconverter Drive

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