Study on Planning of Distribution System Expansion with Distributed Generation
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Date
2018-03
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Publisher
AAU
Abstract
Distribution System Expansion Planning answers the services to be mounted, so that the
distribution network fulfills the predicted load requirement to satisfy all operational and technical
constraints. It is used to particular planning horizon, ensuring the consumer reliability and power
quality standards. The operating characteristics of modern power system are modified due to the
integration of Distributed Generations which have noteworthy economic and technical benefits
such as, reduction of complications in expansion planning of distribution network, reduction in
losses, improving voltage profile, flatter of peak load and increase reliability. This thesis work
mainly provides planning of Cotobie distribution substation with voltage sensitivity analysis
methods to facilitate the integration of Distributed Generation into the grid distribution network.
The results of Distributed Generation are presented to determine the appropriate places and the
capacity to make the distribution network highly reliable. It is shown that outgoing feeder no-4
and feeder no-1 have the least tail end voltage sensitivity index of 0.00132 and 0.00221
respectively. Appropriate places are selected for the DGs and their ratings are determined on the
principle of minimum system power loss. The power capacity of DG for feeder no-1 is found to
be 2.7MW and for feeder no-4 is found to be 4.5MW in MV feeders. Finally for Cotobie
distribution system reliability, voltage profile and power loss before and after DG integration were
compared. The results showed a reliability improvement of 37.08%, voltage profile within limit
of 0.95 - 1.05 p.u and active power loss reduction of 71.68% as well as reactive power loss
reduction of 61.61%. In addition installing as backup a 6MW DG source in LV feeders results the
reliability improvement of 82.428%. So this result shown that even if load demand increases 8.8%
each year then DG units are able to meet the demand requirements until year-5.
Description
Keywords
DG location, DG size, Distribution network expansion, DG, Distribution network reliability, technical constraints, loss reduction, Cotobie