Study On Power Loss Minimization For Distribution Network Reconfiguration Using Genetic Algorithm Case Study Addis North 13215 Kv Substation

Distribution system is a largest portion of network of electrical power system. Different actionsrnhave been taken to improve the efficiency of the distribution network. One of the most basic andrnthe commonest way to improve the performance of the distribution network is the networkrnreconfiguration. Electric distribution systems reconfiguration comprises tie and sectionalizingrnswitches. Tie switches are normally open, and sectionalizing switches are normally closed. Byrnopening and closing these switches, the distribution network can be reconfigured. Thisrnreconfiguration can be done for the objective of loss minimization. In order to get feasible resultsrn(loss minimization), the reconfiguration must meet some constraints, like Kirchhoff‟s voltagernand current laws, other equality and inequality constraints. rnDistribution network reconfiguration is an optimization problem and needs a suitable algorithmrn(method).The method used for this optimization problem is a genetic algorithm optimizationrnmethod. The genetic algorithm has been described in detail and then applied specifically to thernnetwork reconfiguration problem. In the optimization process, load flow of the distributionrnsystem was computed. Then, computer simulation was performed by using DIgSILENTrnPowerFactory software for analyzing the distribution network reconfiguration. In addition,rnoptimized genetic algorithm was used as a tool for network reconfiguration. rnAddis North 132/15 kV substation feeders are used as test system for this particular study.rnBefore the reconfiguration, the power loss is 3.983783 MW, after reconfiguration the power lossrnhas decreased from 3.983783 MW to 1.594640 MW, which is 2.389143 MW (59.91716%)rnreduction. Besides, the maximum voltage drop before reconfiguration is 0.352639, and thernreconfiguration increased it to 5.050102. The minimum voltage before reconfiguration isrn0.992618 p.u., and the minimum voltage is found to be 0.947288 p.u. after reconfiguration. Inrnaddition, the maximum voltage before reconfiguration is 0.992069 p.u., and it is found to bern0.9953500 p.u. after reconfiguration. Based on the findings of this research, it is concluded thatrnreconfiguration of distribution networks can reduce power loss and operating cost as well asrnimproves the voltage profile of distribution systems. Hence, it is recommended that all therndistribution network feeders of Addis Ababa city to be reconfigured for the betterment of thernEthiopian Electric Utility (EEU) services.

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