| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 104 === The more and more high-power devices like arc furnaces, electric welders, air compressors are used widely in recent year. These high-power devices will cause voltage fluctuations. And the voltage fluctuations will cause bad power quality causing the machine malfunction or the damage of the machine. It will also make the illumination equipment have phenomenon of light flicker. Light flicker may make human eyes uncomfortable, fatigue, dizziness. Therefore, the IEC 61000-4-15 is proposed to regulate the voltage flicker by International Electrotechnical Commission. Moreover, the short-term flicker severity and long-term flicker severity are defined to calculate the flicker severity index.
Due to the IEC standard procedures have squaring calculation and bandpass filter, it cause the IEC standard could not evaluate voltage fluctuations containing interharmonic components with the frequency higher than 102Hz and lower than 18Hz. Therefore, this study proposes the filters for the interharmonic frequency, and the short-term flicker severity value will be calculate by the half-wave RMS method and the follow procedures. Then, we compared the results it with the experimental results of IEC method to reveal the IEC standard characteristic. The purpose is to reduce the error of detection and analyze the spectra components of interharmonic frequencies, so that the IEC flickermeter is improved.
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