الفهرس | Only 14 pages are availabe for public view |
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 |