Study on Planning of Distribution System Expansion with Distributed Generation

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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.



DG location, DG size, Distribution network expansion, DG, Distribution network reliability, technical constraints, loss reduction, Cotobie