الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The power system protection is one of the greatest concerns for electrical power
engineers to have robust and secure systems. The penetration of renewable energy
sources in the conventional power systems has made it more complex to make
full use of the advantages of the renewable sources, while maintaining the system
parameters within the acceptable limits.
The main aim of this thesis is to deal with the changing nature of the
distributed generators (DGs) introduced in the network, by employing an adaptive
protection scheme to trace the status of DGs connection to the network and
accordingly update the relay settings to be convenient with the operating case.
This adaptive coordination scheme is utilized to control the operation of
overcurrent relays (OCRs) and directional overcurrent relays (DOCRs).
Also, this thesis is assessing the effect of utilizing current-based techniques
with DOCRs instead of the conventional technique which depends on voltage and
current measurements. These techniques reduce the cost of using voltage
transformer with the DOCRs in the future. Different scenarios are performed to
test the proposed adaptive coordination scheme. Moreover, a comparison with
the conventional non adaptive system is presented to validate the proposed
scheme contribution.
The results of simulations are investigated and analyzed. Results confirm the
effectiveness and feasibility of the proposed scheme when compared with nonadaptive
conventional type of DOCRs. The current-based technique is simulated
as well, and results are obtained that shows the reliability of the proposed currentbased
technique. This makes the adaptive scheme more practical and feasible to
be implemented in the real networks without the burden of requiring bulky
voltage transformers.