Voltage and Reactive Power Control for Power loss Minimization of Distribution Networks Case Study- (Sebeta I Substation Outgoing Feeder)
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Date
2019-03
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Addis Ababa University
Abstract
With the rapid growth of electrical power consumption, the expansion and complexity of power transmission and distribution networks also increase, this expansion leads to frequently changes in loading conditions to operate on overloaded or to operate with under loaded conditions. Electricity distribution networks form the backbone by which electricity is effectively delivered to the consumers. In Ethiopia most of distribution network have problem of operating on overloaded condition that result on voltage drop and most of them supply to factory that cause the reactive power increment on the system.
This thesis studies on a comparative analysis of the problem of voltage drop and reactive power solving methods that can be implemented power loss minimization of distribution networks Sebeta I substation.Voltage drop which is caused by system overloading and Reactive power in distribution networks is fundamental issue for power loss and maximum transmission of power in the distribution network. There are different methods for solving voltage drop and reactive power problem for power loss minimizations.Basically this thesis studies on comparatively application of mechanisms for voltage drop and reactive power like, shunt capacitors, distributed generation, load sharing, and use of additional transformer in substation level. The system network is modeled using DIgSILENT Power Factory software and all four methods mentioned above are simulated using this Package. Load flow calculations are carried out and the results obtained are used to compare the impact of the four methods on the performance of the system. The methods are compared based on the improvement of voltage profile, reduction in the total real power losses, power factor correction and future load capacity is implemented.
From methods that are implemented comparatively, use of additional transformer with rating of 50MVA 132/15kV 1.25%, with 4MVAR capacitor bank is recommended based on reduction of over load by 78%, which improving the voltage profile from 0.87 per unit to 0.98 per unit at the last bus bar of distribution network of feeder 02 and, power loss also minimized by 97% of feeder 02 and over all power loss reduced by 20%.
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Over Current, Power Distribution, Reactive Power Compensation, Voltage Drop, Nominal Current, Distributed Generation, Current Carrying Capacity