الفهرس 
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Abstract
The distribution network is the intermediate network between transmission
system and the consumers. The problems which may be found in the
distribution network affect both the consumers and utilities. One of these
problems is the voltage DROP which must be reduced keeping the voltages at
load points within standard limits. The voltage DROP problem may arise -when
using lateral radial feeders with long distance or feeding large loads.
Therefore, this thesis- concerns with the solution of voltage DROP problem. It
presents the application of series capacitors to long--distance lateral distribution
feeders. It has been shown that the series capacitors arc used mainly in
distribution networks to; reduce: voltage DROP., reduce line losses, reduce voltage’
fluctuations, increase feeder capacity, and fast and easily start large motors,
Series capacitors produce a voltage increase that is proportional to the line
current. i.e.. it is continuously adjusted to the load variation and is self
regulating. Bused on fuzzy-logic technique. the size of series capacitors at
assumed locations required for each section of the literal feeder is calculated.
This technique is based on calculating two parameters expressed as; load flows
in each section of the feeder, and the sending voltage of that section resulting
from voltage DROP calculation. They are expressed by linguistic variables in ,
I Rule: IF .. , Then. This rule helps to carry out an approximate reasoning of i
voltage control. The effect of control to restore the voltage to normal values can
be determined by using the conversion of l:he precise quantity of voltage and
loads to a fuzzy quantity. A fuzzy system with two non-interactive inputs and a
single output is. introduced in this thesis and a practical case-study is- solved
illustrating the applicability and robustness of the proposed. Technique.