Flicker mitigation in industrial systems

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dc.contributor.advisorMouton, H. du T.
dc.contributor.authorDe Wit, Leonen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering.
dc.date.accessioned2006-10-10T06:07:27Zen_ZA
dc.date.accessioned2010-06-01T08:38:17Z
dc.date.available2006-10-10T06:07:27Zen_ZA
dc.date.available2010-06-01T08:38:17Z
dc.date.issued2006-03
dc.descriptionThesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
dc.description.abstractThis thesis investigates the compensation of voltage flicker in an industrial environment. Industrial loads draw progressively less sinusoidal currents. These currents cause non-sinusoidal voltage drop over the line impedance, causing a distorted line voltage. The light output of incandescent electric lighting systems is quadratically proportional to the line voltage, and thus variations in the line voltage cause irritating variations in the output of such systems. Two tools to analyse flicker problems are developed: A USB data logger is built to log measured waveforms to computer hard disk. These data are analysed using a MATLAB implementation of the IEC-specified flicker meter. A converter-based flicker compensator is found to be the only compensator capable of compensating general flicker loads. Such a compensator is developed using the synchronous reference frame filtering technique. Several aspects of the compensator are dealt with in detail including selection of a current control strategy, calculation and implementation of the converter duty cycles and compensation of the various non-idealities in such a controller. Full compensation is contrasted to reactive compensation – the second option being less expensive but also less effective in the compensation of certain loads. The effectiveness of reactive compensation is found to be dependent not only on the type of load, but also on the type of line feeding the flicker load. Three industrial flicker loads are measured and analysed: a three-phase welder, a sawmill and a rock crusher. These loads are simulated, and the compensation proposed confirmed via these simulations. The compensation of the three-phase welder is tested using a hardware scale model. This verified the operation of the proposed flicker compensator in practice.en_ZA
dc.format.extent2275355 bytesen_ZA
dc.format.mimetypeapplication/pdfen_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/1994
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectTheses -- Electrical and electronic engineeringen_ZA
dc.subjectDissertations -- Electrical and electronic engineeringen_ZA
dc.subject.lcshVoltage regulatorsen_ZA
dc.subject.lcshElectric power transmissionen_ZA
dc.subject.otherElectrical and Electronic Engineeringen_ZA
dc.titleFlicker mitigation in industrial systemsen_ZA
dc.typeThesisen_ZA
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