• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.69-70
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• 2007

Now the IEC flicker measuring algorithms and its flicker index of $P_{st}$ and $P_{lt}$ are accepted internationally as standards. But it is recently found that IEC flickermeter has a main drawback that it cannot afford to detect the fluctuating patterns of voltage envelope caused by interharmonics higher than 102Hz in the 60Hz power system. This is brought about by two components of IEC flicker measuring steps, squaring and low-pass filtering. This paper presents the innate defect of IEC flickermeter and proposes a modified measuring method considering the voltage flickers by subharmonics and interharmonics.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.2
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• pp.232-238
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• 2009

Flicker, also known as voltage fluctuation, is a newest problem of power quality issues, because it is caused by nonlinear loads such as electrical arc furnace and large-scale induction motor, which are country-widely used as the heavy industries of a country develop. An international standard, International Electrotechnical Commission (IEC) 61000-4-15, was published in 1997 and revised in 2003. With increasing concerns about flicker, its mitigation methods have been also studied. General countermeasures for flicker are divided into three categories: a) enhancing the capacity of supplying system, b) Series elements including series reactor and series capacitor and c) power electronic devices including static VAR compensator (SVC) and static synchronous compensator (STATCOM). This paper introduces how to mitigate the voltage flicker at the point of common coupling (PCC) and presents how to simulate and compare the flicker alleviating effects by each mitigation method, using IEC flickermeter based on the Matlab/Simulink program.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1402-1406
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• 2004

As a method of confirming light flickering, we tried to confirm the flicker index measured by Flickermeter and the application possibility by using digital intensity of illumination meter. Also, after simulating the quality deterioration of electric power and generating a various voltage change, we studied on the function between the flicker index measured by Flickermeter and the flicker index for the intensity of illumination by using digital intensity of illumination meter.

• Proceedings of the KSR Conference
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• 2003.10c
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• pp.617-622
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• 2003

Light Flickering of the lamp(fluorescent lamp) with voltage fluctuation operates as an factor harmful to train passengers which is subjective to them. Recently, international flickering standard(IEC61000-3-3) are applied all over the world. However, there are not any study preparing for regulation about light flickering inside running train. In this study, the Flicker phenomenon is investigated from several references and also how the flickermeter is configured and defined. Flicker evaluation using it are studied.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.117-119
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• 2005

Voltage Flicker는 다른 전력품질 요소들과는 달리, 전압의 흔들림이 사람의 눈과 뇌에 미치는 영향을 고려한 지수이다. IEC 61000-4-15에서는 이러한 플리커의 평가 알고리즘을 제시하고 있으며, 제한치를 $Pst{\leq}1$, $Plt{\leq}0.65$로 정의하고 있다. 이 제한치는 다양한 비선형 부하들의 경우에도 만족시켜야 하며, 계통의 설계 시 미리 고려를 할 필요성이 있다. 본 논문에서는 Fortran을 이용하여 IEC61000-4-15의 플리커미터 알고리즘을 구현하고 이를 PSCAD/EMTDC의 Module로 적용시켜, 시험 계통이 플리커 제한치를 만족시키는가에 대한 테스트가 가능하도록 하였다.

• Journal of Electrical Engineering and Technology
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• v.3 no.3
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• pp.314-319
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• 2008

Power quality simulation plays an important role in many practical cases, for example, when deciding the capacity of the related mitigation devices, assessing the influence of installing a nonlinear load in the distribution part, dissolving the quality issues between utilities and customers, and so on. For these purposes, many dedicated tools have been used in order to assess the level of quality distortions by various kinds of PQ indices. However, there are few modules that can accurately simulate the flicker phenomenon, that is, $P_{st}$ and the nonlinear and chaotic behavior of the electrical arc furnace, which is one of the representative nonlinear loads. This paper deals with the useful and simple modules for the voltage flicker simulation in the distribution and transmission level under the environment of Matlab/Simulink. With these modules, the various conditions of distribution systems and the capacities of arc furnaces with the chaotic characteristic can be easily taken into account.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.83-84
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• 2008

Voltage fluctuation, also known as flicker, is a power quality problem caused by nonlinear loads like electric arc furnace. Since it is interpreted as a variation of the supplied electrical energy, it causes the residential customers to feel much annoyed visually through the lamps. Due to the statistical nature of IEC (International Electrotechnical Commission) short-term flicker severity index, Pst, it is not feasible to pre-evaluate the flicker level using the transient power system simulators such as Sim Power System in Matlab/Simulink. So this paper presents not only how to design the Matlab/Simulink IEC flickermeter to yield the Pst value, which considering electric distribution environments of South Korea, but also how to mitigate the voltage flicker at the Point of Common Coupling (PCC). In order to achieve this, the flicker mitigation efficiencies of various compensating devices, such as Static Var Compensator (SVC), STATCOM will be applied and compared. The simulated result demonstrates which compensating equipment is the most efficient method to mitigate the flicker phenomenon.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.7
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• pp.1017-1024
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• 2017

The International Electrotechnical Commission(IEC) 61000-4-15 is a standard proposing techniques for a flicker meter test and measurement method. The IEC61000-4-15 ed1 announced in 1997 was not include tests for accurate verification. Also it was not explained flicker meter algorithm that can be directly applied to the other power systems. But the new edition of IEC61000-4-15 ed2 prescribes a variety of tests for verify flicker meter algorithm and it explains 'correction factor' used for measuring flicker in other power systems. It can measure flicker severity in 220V system by multiplying correction factor to the measured values with the 230V algorithm. This paper compared the method of measuring flicker severity in korea power system using the correction factor and the modified weighting filter, after verifying of digital flicker meter algorithm created by using matlab based on IEC61000-4-15 ed2.