Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: Voltage regulation on distribution networks has so far been done by means of
mechanical tap changers. However, these tap changers are plagued by high
maintenance costs due to the arcing caused while switching, which degrades
both the contacts and transformer oil. The major advances made during the
last decade with regard to semiconductor technology have led to the development
of high power IGBTs. These high power IGBTs are capable of conducting
currents up to 1 000 A, while the voltage over the IGBT reaches well over 3
000 V. Using these high power IGBTs to design and build a solid-state tap
changer allows the tap changer to regulate the output voltage with higher accuracy
and speed. The supporting hardware is also discussed, while the design
is verified by the use of simulations and practical measurements conducted on
a scale-model of the IGBT-based solid-state tap changer. / AFRIKAANSE OPSOMMING: Spannings regulasie op distribusie netwerke word hedendaags verrig deur meganiese
tap geskalde spanning reguleerders. Maar hierdie tap skakelaars word
konstant beïnvloed deur oorvonking wat plaasvind tussen die kontakte wat hierdie
kontakte beskadig en die transformator olie degradeer. Die laaste dekade
het groot vordering getoon in halfgeleier navorsing wat gelei het tot die ontwikkeling
van hoë drywing halfgeleiers. Die halfgeleiers of IGBTs kan strome
so groot soos 1 000 A gelei terwyl die spanning oor die halfgeleier 3 000 V kan
oorskry. Die gebruik van die hoë drywing halfgeleiers maak die pad oop vir die
ontwerp en bou van ’n tap geskakelde reguleerder wat die uitree spanning akurater
en vinniger kan reguleer. Die aanvullende hardeware is ook bespreek en
die ontwerp is geverifieër deur middel van simulasies en deur praktiese metings
wat geneem is op ’n skaal model van die hoogspanning spannings reguleerder.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/4272 |
| Date | 03 1900 |
| Creators | Fourie, Reinhart |
| Contributors | Mouton, H. du T., University of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 164 p. : ill. |
| Rights | University of Stellenbosch |
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