MScEng / Thesis (MScEng (Electrical and Electronic Engineering))--Univerity of Stellenbosch, 2009. / ENGLISH ABSTRACT: As the number of distributed generation units connected to a distribution network
increase, the possibility of island formation increases. An island is formed when
distributed generation units continue to energize local loads within a section of the grid,
which has been disconnected from the main distribution network. These islands pose
significant danger to maintenance personnel as well as to members of the public.
In this study, an investigation is done into various anti-islanding methods. The modes of
operation of these methods are discussed, as well as their strengths and weaknesses. The
slip-mode frequency shift method and the Sandia voltage shift method, in combination
with over/under voltage and frequency protection, are simulated and tested to confirm
their functionality. The results obtained show that it is possible to prevent distributed
generation units from energizing local loads when the grid is disconnected. / AFRIKAANSE OPSOMMING: Die moontlike toekomstige toename in die aantal verspreide generasie eenhede gekoppel
aan die verspreidings netwerk, verhoog die moontlikheid van eiland vorming. ‘n Eiland
word gevorm wanneer verspreide generasie eenhede energie aan lokale laste voorsien
nadat die netwerk ontkoppel is. Dit hou groot gevaar in vir onderhouds personeel asook
vir die publiek.
In die tesis word ‘n studie gedoen oor die verskillende metodes om die vorming van
ongewensde eilande te voorkom. Die glipmode-frekwensieskuif metode en die Sandia
spanningskuif metode word gekombineer met die oor/onder spanning en frekwensie
beskerming metodes. Die kombinasie van metodes word dan gesimuleer en
eksperimenteel getoets. Die verkrygde resultate toon dat dit moontlik is om die vorming
van ongewensde eilande effektief te voorkom.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/1559 |
| Date | 12 1900 |
| Creators | Hobbs, Ivan Kevin |
| Contributors | Beukes, H. J., 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 | Unknown |
| Type | Thesis |
| Rights | University of Stellenbosch |
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