Thesis (MScIng)--University of Stellenbosch, 2004. / ENGLISH ABSTRACT: This thesis covers the development of a transformerless series dip compensator. Of all known power
quality problems, voltage dips are the greatest reason for concern. Series injection dip compensators
offer the advantage of only having to compensate for the decrease in supply voltage during a dip.
This results in significant reduction in converter ratings and energy storage requirements. The aim of
this thesis was to take up previous developments and combine them with new technologies to
maximize their functionality. The new design was implemented with ultracapacitors to offer a
maintenance-free device lifespan of 20 years. As they are very expensive, a new topology was
introduced in this thesis to maximize their use so that they become viable for industry. Furthermore,
a new method of daisy chaining switches was introduced to minimize costs involved in controlling
them. A single-phase compensator, with this new topology and the new way of controlling switches,
was designed and built according to specifications stated by Eskom. This ultracapacitor-based dip
compensator was tested with a dip generator, developed by the University of Stellenbosch for
different load currents. The experimental results confirmed simulations made with identical
parameters. This thesis presents a reliable and cost effective solution for dip compensation. / AFRIKAANSE OPSOMMING: Hierdie tesis dek die ontwikkeling van ’n transformatorlose duik kompenseerder. Van al die bekende
toevoerkwaliteit probleme wek duike in die spanning die meeste kommer. Serie-injeksie
kompenseerders het die voordeel dat hulle net kompenseer vir die verlies in die toevoerspanning
tydens die duik. Dit het ’n beduidende vermindering in die omsetterkenwaardes en
energiestoorvereistes tot gevolg. Hierdie tesis mik om vorige soortgelyke ontwikkelings op te volg
en te verbeter met nuwe tegnologie om die funktionliteit te maksimeer. Die ontwerp is
geimplementeer met ultrakapasitore wat die onderhoudsvrye toestel ‘n leeftyd van 20 jaar toelaat.
Omdat ultrakapasitore so duur is moes ‘n nuwe topologie onwikkel word om die gebruik van
ultrakapasitore meer ekonomies aantreklik te maak. Daar is ook ‘n nuwe manier van skakelaar
beheer ontwikkel wat toelaat dat baie skakelaars oor een optise veesel beheer kan word. ‘n Enkel
fase dip kompensaeerder is toe onwikkel en gebou volgens Eskom se spesifikasies. Die
ultrakapasitor gebaseerde omsetter is getoets met ‘n dip generator wat deur die Universiteit van
Stellenbosch ontwikkel is. Die praktiese resultate bevestig die simulasies wat gedoen is met dieselfe
parameters. Hierdie tesis lei tot ‘n betroubaare en ekonomiese oplossing vir duik kompensasie.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/16256 |
| Date | 12 1900 |
| Creators | Becker, Martin Gerhard |
| Contributors | Mouton, H. du T., University of Stellenbosch. Faculty of Engineering. Dept. of Electrical Engineering. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | xx, 195 leaves : ill. |
| Rights | University of Stellenbosch |
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