Abstract
Depending on different load characteristics, various power quality disturbances such as sag-swell, harmonics, inter-harmonics, and flicker, appear in electric power systems. Among these power quality disturbances, the flicker is one of the critical power quality phenomenon due to the lack of source detection and disturbance responsibility sharing method. The measurement of the flicker level is defined in the IEC 61000-4-15 standard by a flicker meter. This meter deals only with voltage signals and is not sufficient to understand the contribution of the load and background power systems separately. Thus, this paper proposes new approaches to the evaluation of flicker characteristics using the real on-site measurements taken from two different iron and steel factories. The novelty of this paper is investigating the flicker characteristics in light of statistical methods, spectral and multi-resolution wavelet analysis, and the information theory based wavelet energy entropy analysis together, and proposing a new index to interpret the flicker responsibility of load and power system. This proposed index is called Flicker Contribution Ratio (FCR) and represents the percentage flicker disturbance responsibility of both load and power system.DOI: http://dx.doi.org/10.5755/j01.eie.24.2.20631
Highlights
Flicker is defined as the impression of unrest of visual affection caused by a light stimulus whose spectral distribution varies with time [1]
The flicker compensation performance of SVC is low compared to STATCOM, when the results of the IEC flicker meter is multiplied with Flicker Contribution Ratio (FCR) value, the compatibility level can be reached by SVC solution
Since the voltage at the measurement point might include the background flicker effect, it will not be fully accurate to interpret the flicker responsibility of the installation considering the results of this flicker meter directly
Summary
Flicker is defined as the impression of unrest of visual affection caused by a light stimulus whose spectral distribution varies with time [1]. The light flicker or socalled voltage flicker appears because of the voltage fluctuation. Voltage flicker can be explained as voltage amplitude modulation, and its modulation frequency appears between 0.5 Hz to 35 Hz. Besides the conventional flicker generating sources such as arc furnaces and welding machines, wind turbines, solar power plants and variable frequency drives, are known as flicker sources. The frequency and the magnitude of the voltage fluctuation have great importance in term of the effect of each source on the flicker. The flicker level can be defined by a flicker meter depending on both the frequency and the magnitude
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