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Author: search.filters.author.Boonseng, C.Subject: search.filters.subject.Harmonics

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    Analysis of harmonic for 12-pulse converter under unbalanced voltage operation due to lightning related voltage sags and short interruption
    (2001-12-01)
    Boonseng, C.
    ;
    Kinnares, V.
    This paper presents a summary of power quality related concerns associated with the applications of 12-pulse converter with dc motor drives in the industrial plants. These concerns include power system harmonic and harmonic distortion under unbalance voltage condition during voltage sags occurrence. The definition proposed focuses on system faults due to lightning. The voltage unbalance causes large unbalance source currents resulting in excessive input current and high distortion. The percentage of total harmonic distortion of input current (THD<inf>i</inf>) increased approximately 47% at 6 per unit of normal peak current. The measurement and analysis of such events has been performed. Finally, the new phase-angle jump concept based on measured techniques is introduced.
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    Harmonic analysis of corona discharge ozone generator using brush electrode configuration
    (2000-01-01)
    Boonseng, C.
    ;
    Kinnares, V.
    ;
    Apriratikul, P.
    This paper describes a new method of ozone generation particularly suited to use in water treatment. The authors present harmonic analysis and the ozone concentration generated by a new type of ozone generation. Relative harmonic distortions in line input have been investigated experimentally. The experimental results were obtained using a concentric cylinder with brush electrode separated by a glass tube. This configuration can avoid breakdown. Essentially AC high voltage is derived from a high voltage transformer, which is controlled by a flyback converter. The ozone generator can produce 64 ppm ozone at 15 kV output and switching frequency approximately 20 kHz. Finally, the effects of corona discharge power on the corona surrounding temperature and its relationship with ozone concentration have also been investigated.