الفهرس 
Power System Reliability and Functional Zones
Distribution System Reliability EvaluationOnly 14 pages are availabe for public view
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Abstract
The distribution system is a part of the electric power system that
links the bulk transmission system and the individual customers.
Approximately 80 % of outages experienced by the customers are due to
failures in the distribution system. It is therefore important to understand
of the outages on the customer outage costs and the system reliability.
The research covers several implications of
Optimized and safe designing of distribution systems concludes
the protective and switching devices in strategic places of the distribution
system to improve the reliability indices. The proposed placement of
switches and protective devices leads to minimize the total cost while
simultaneously improvement of reliability indices.
This thesis evaluates various analytical and simulation techniques
by using ETAP & NEPLAN packages which incorporate varying degrees
of complexity and data to evaluate the expected reliability indices at the
load point and at the system of a radial distribution networks.
Adding tie switches between each two feeders helps improve the
reliability indices of the system significantly EENS
Not supplied)
by 33% and ECOST feeders in RBTS BUS 2 distribution test system
Ranking the feeders shows the best sequence of entering on
feeders according to priority of feeders of highest expected energy not
supplied (
The best location for the placement of the DG is at the end of the
line in terms of reliability improvement. Once the fault is isolated, the
downstream customers can be supplied by the DG and the upstream
customers can be served by the substation. In this case study,
installing a 2MW DG at the end of line for feeder 1 in RBTS BUS 2
distribution test system can improve the EENS index by 7% for
O.H.T.L improves, for U.G.C improves by 10% and ECOST index for
O.H.T.L improves by 8%, for U.G.C improves by 12% as compared to
installing DG at the substation.
The proposed strategy implies study the impact of different
Distributed generation sizes according to priority of feeders of highest
EENS and its impact on each feeder separately and hence on overall
system for O.H.T.L & U.G.C.
Increasing the size of the DG from 0.5MW to 2MW also
improves the reliability indices since more generation is available to
serve customers during fault conditions. For example, when Installing
DG Installing small-scale distributed DGs instead of an aggregated
large-scale DG can improve the system reliability indices, depending on
the locations of DGs, the number of customers and the sizes of the loads.
However, the reliability indices improve the most when the aggregated
large-scale DG
For example, the EENS index can improve by 1.35% for
O.H.T.L, for U.G.C improves by 1.73%, ECOST index for O.H.T.L
improves by 2.27%, for U.G.C improves by 3.26% when Installing
small-scale DG
The developed strategy is implemented on Roy Billiton Test
System