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Vol.105 (4) December 2014 SOUTH AFRICAN INSTITUTE OF ELECTRICAL ENGINEERS 1
December 2014
Volume 105 No. 4www.saiee.org.za
Africa Research JournalISSN 1991-1696
Research Journal of the South African Institute of Electrical EngineersIncorporating the SAIEE Transactions
Vol.105 (4) December 2014SOUTH AFRICAN INSTITUTE OF ELECTRICAL ENGINEERS134 � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � �Mrs Gerda Geyer
South African Institute for Electrical Engineers (SAIEE)
PO Box 751253, Gardenview, 2047, South Africa
Tel: (27-11) 487-3003
Fax: (27-11) 487-3002
E-mail: [email protected]
� � � ! " # $ % & ' ( ' ) ' & * $ & ' $ + + & " $ , - ' � $ * # ' , ' * * $ & .� / 0 1 2 3 4 5 5 6 7 8 1 0 0 4 9 0 : 0 ; 4 5 � 1 4 4 � < / 1 2 � / 4 5 4 � / 2 ; = : 6 / > � 3 � / 4 < 6 3 3 ? @ 4 4 / / 4 A 1 4 B 4 9@ / 1 : / 0 : � 2 2 4 @ 0 � > 2 4 < : / @ 6 7 3 1 2 � 0 1 : >0 - ' C " % % " ) # D " & D $ # * $ ! " # * - $ ( ' % * ! ' � 5 � 1 4 4 � C & , $ / ' * ' $ & , - = " E & # $ % C " & $ F * ! & $ , ! " # + E & + " * ' * GINSPEC (The Institution of Electrical Engineers, London); ‘The Engineering Index’ (Engineering Information Inc.)
H I J K L M N O P I M H Q J H R H M NS T U V W X Y U Z Y [ \ U ] ^_ ` a b c d c e c f g h i j k l, Faculty of Engineering and the Built Environment, e m Z m n U Z n ] T U V W X_ ` a b c o c o p q r g
, Faculty of Engineering and the Built Environment, o _ ] [ U m f U o V ] T U V W X o[ a s s j q p h g l p a q t g q u o p v q g w _ ` a h k t t p q v x_ ` a b c f c _ c f p q u kUniversity of Pretoria, SA _ ` a b c o c e g r g ` g yUniversity of Pretoria, SAT ` W c \ a w w g q u
, Centre for Telecommunications Research, London, UK_ ` a b c ^ c V g z g { p ` g, School of Electrical and Information Engineering, _ ` a b c m c | c \ g q } p q h zT ` ] c n a w a ~ p q t
Pretoria, SA[ a s � j l k ` � U q b a ` s g l p a q o � t l k s t g q u o a b l { g ` k ] q v p q k k ` p q v xT ` e c � k t l t l ` g l k �Newco Holdings, Pretoria, SA_ ` a b c m c ~ g q u k ` e k ` { k
T ` [ c ~ g q u k ` � g w lResearch, Pretoria, SA._ ` a b c d c T { a w g l � z �[ a q l ` a w g q u m j l a s g l p a q xT ` d c � j z t k w_ ` a b c V c ~ g q Z p k z k ` z] w k h l ` a s g v q k l p h t g q u m q l k q q g t x_ ` a b c | c \ c [ w a k l k_ ` a b c V c | c W c m b j w w a_ ` a b c X c n k t h r z k] w k h l ` a q T k ~ p h k t g q u [ p ` h j p l t x_ ` a b c e c u j _ w k t t p t
University of Pretoria, SAT ` T c ^ a l �, Gilgamesh Associates, LLC, Vermont, USA] q k ` v � g q u _ a { k ` o � t l k s t x_ ` a b c e c T k w p s g `] q v p q k k ` p q v g q u V k h r q a w a v � e g q g v k s k q l x_ ` a b c | Y \ c _ ` k l a ` p j t
, Faculty of Engineering and the Built Environment, _ ` a b c f c _ ` k l a ` p j tPretoria, SA
] q v p q k k ` p q v p q e k u p h p q k g q u d p a w a v �_ ` a b c | c | c \ g q k z a s �University of Pretoria, SA _ ` a b c ^ c X g l l g � �
Vienna University of Technology, Austria_ ` a b c d c d a q r g s � University of California, San Francisco, USAn k q k ` g w V a � p h t � ] u p l a ` t Y g l Y w g ` v k xT ` _ c | c [ p w w p k ` t �_ ` a b c e c m c ~ g q � � z
, School of Electrical and Information Engineering, U Z V ] X Z m V U W Z m f _ m Z ] f W ^ X ] } U ] � ] X oW.A. Brading, New Zealand
The University of Birmingham, UK
Prof. J.A. Ferreira, Electrical Power Processing Unit, Delft University of Technology,
The Netherlands
Technical University of Darmstadt, Germany
C.F. Landy, Engineering Systems Inc., USA
Prof. D.A. McNamara, University of Ottawa, Canada
Clemson University, USA
R.T. Waters, UK
T.J. Williams, Purdue University, USA_ j � w p t r k u � �Tel. (27-11) 487-3003, Fax. (27-11) 487-3002,
� � � � � � � � � �Dr Pat Naidoo� � � � � � � � � � � � � � � �Mr André Hoffmann
� � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � � � �