Integration Of Distributed Generation With Distribution Network Expansion Planning (case Study Adwa Distribution Substation)

Expansion planning of a distribution network answers to be mounted the services, so that the distributionrnnetwork fulfills the predicted load requirement to satisfy all operational and technical constraints.rnIntegration of distributed generations (DG) which have economical and technical benefits such as reductionrnin losses, improving voltage profile, reduction line loading and provides good voltage stability. rnThis thesis mainly investigates expansion planning of Adwa distribution substation with analytical voltagernsensitivity index methods to facilitate the integration of distributed generation DG into the distributionrnnetwork. The results of DG are presented to determine the appropriate places and the capacity to make therndistribution network highly reliable service. The feeder was selected due to its lowest voltage sensitivityrnindex from the other feeders and due to its highest power interruption when it is compared with otherrnoutgoing feeder for the one year recorded data. In addition, the outgoing feeder KO1 at bus 50 have thernleast tail end nodal voltage sensitivity index of 0.002210 when it is compared with the other bus.rnAppropriate places are selected for the DG and their ratings are determined due to the principle ofrnminimum system power loss. The power capacity of DG for feeder KO1 is found to be 12.70 MW and 3.30rnMW as a reserve at bus 50 and the capacity of DG increases with demand growth at each year. rnThe peak load demand forecasting for ten years for Adwa distribution substation is carried out using leastrnsquares extrapolation technique. The peak power demand reaches 75.31MW after 10 year and the loadrngrowth it increases by 7.07 present at each year. Moreover, due to presence of DG placement in therndistribution network, it implements and coordinates eleven fast protection relays based on magnitude of thernfault current and fault tripping time in the line. In order to reduce the impact of DG on the protection devicernwhen the capacity of DG highly increase with demand it upgrades the margin of both current and timerninterval of the relay. rnFinally, the voltage profile, voltage stability and power loss of Adwa distribution substation arerncompared with and without DG integration to meet the current demands as well as when the DG capacityrnincreases to supply the increasing future demand. It is found that without DG integration, the voltagernprofile lies within a limit of 0.866 – 1.0 p.u while the DG integration provides an improved voltagernprofile within 0.974 – 1.0 p.u. It is further observed that DG integration provides an improved voltagernstability and reduces the active and reactive power loss by 94.67% and 95.59%, respectively asrncompared to those without DG integration. Furthermore, when the DG capacity increases with increasingrndemand, it has positive technical benefits such as voltage profile improvement, reduction in active andrnreactive power losses as well as line loading. The simulation results further demonstrate successfulrnimplementation and coordination of fast protection relays. Also, the fast protection relays arernsuccessfully upgraded when the capacity of DG increases with increasing demand.

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