Optimal Location and Sizing of Distributed Generation The Case Study of Adama Distribution System
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Date
2015-03
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Addis Ababa University
Abstract
Integrating distributed generation (DG) to an existing distribution system delivers various profits for both utility and end users. Distributed generation provides a means to beat incremental increase in energy demand, to improve distribution system reliability and decrease power loss by generating electric power at the distribution system.
Distributed generation is a developing idea in the electricity sector, which represents good choices for electricity supply instead of the old centralized power generation concept. The introduction of DG leads to a fundamental modification in how distribution networks are utilized and observed. Distribution networks are now used as a means to connect geographically dispersed energy sources to the electricity system; thereby converting what were originally energy delivery networks, to networks used both for the delivery and generation of energy.
This thesis presents analytical methods to facilitate integration of DG into the existing grid distribution systems. The method is applied to distribution system for determining the optimal location and size of DG with respect to the technical constraints on DG such as, voltage sensitivity and losses both at the same time to use existing distribution network in an optimal manner. The method is implemented and tested on Adama town distribution network.
Results of optimal DG size and place with respect to voltage sensitivity and loss reduction are presented demonstrating the best places and the size of DG for the Adama distribution network to make the system highly reliable. It is shown that bus 5 and bus 1 have the least voltage sensitivity index 0.223146 and 0.56570 respectively and are selected as the best places to install DG. To determine the size of DG to be installed minimum loss reduction factor is used and the maximum DG size for bus 1 is found to be 4MW and for bus 5 is found to be 8MW. Finally for Adama distribution system reliability before DG integration and after DG integration was compared and resulted in reliability improvement of 62.428%.
Key words: DG optimal location, DG optimal size, distributed generation, objective function, distribution system reliability, technical constraints, loss reduction.
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Keywords
DG optimal location, DG optimal size, Distributed generation, Objective function, Distribution system reliability, Technical constraints, Ioss reduction