Design and Evaluation of High Voltage Transmission System for the Grand Renaissance Hydro Electric Power Plant in Ethiopia

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dc.contributor.advisorBiru, Getachew(PhD)
dc.contributor.authorDesta, Melaku
dc.date.accessioned2018-07-09T06:47:40Z
dc.date.accessioned2023-11-04T15:14:37Z
dc.date.available2018-07-09T06:47:40Z
dc.date.available2023-11-04T15:14:37Z
dc.date.issued2012-12
dc.description.abstractThe Ethiopian Electric Power Corporation (EEPCo) is, currently, undertaking a huge electric power generation expansion plan. The generation capacity under construction is about 7757 MW. This huge expansion demands new transmission line installations. Among the Electric power Generations that are under construction is the Grand Renaissance Hydro Electric Power Plant. This project takes the lion share which accounts about 5250 MW. To transmit this huge power EEPCo planning department designed two dual circuit 500 kV HVAC transmission lines. The length of these transmission lines from GRHEPP to Menagesha substation (Main Grid) is about 574 km. Estimates showed that the break even distance is around to 500 km. the range of this value vary depending on the range of power transmitted and cost of equipments incurred. The intention of this thesis work is to develop two 500 kV bipolar HVDC transmission system and compared with the HVAC transmission system in terms technical performance and costs incurred for each transmission systems. In technical performance: transmission line efficiency, voltage regulation, corona losses are considered and in cost analysis: investment cost and power loss cost over the entire life cycle (i.e. 35 years) of the transmission lines are considered. From the technical performance it can be saved 133 MW power, if two bipolar HVDC transmission line is implemented, the HVDC line is more regulated than HVAC line and the HVAC line is less friendly to the environment than the HVDC line. From the cost analysis the break even distance obtained is around 400 km i.e. below 574 km. So the bipolar HVDC transmission system is less costly than HVAC transmission system for distances above the break even distance. And the dynamic performance of the HVDC transmission system during transient states is analyzed and observed obtained that during three phase short circuit faults applied on ac side of both transmission lines, the HVDC line reached its steady state condition after 4 cycles (EEPCo standard). The designed HVDC transmission system has better technical performance and also cheaper in investment cost when compared with the HVAC transmission system. KEY WORDS: HVDC, HVAC, Break even distance, Transmission line efficiency, corona loss, Loss cost, Current controller, Gamma angle controller.en_US
dc.identifier.urihttp://etd.aau.edu.et/handle/123456789/7171
dc.language.isoenen_US
dc.publisherAddis Ababa Universityen_US
dc.subjectHvdcen_US
dc.subjectHvacen_US
dc.subjectBreak Even Distanceen_US
dc.subjectTransmission Line Efficiencyen_US
dc.subjectCorona Lossen_US
dc.subjectLoss Costen_US
dc.subjectCurrent Controlleren_US
dc.subjectGamma Angle Controlleren_US
dc.titleDesign and Evaluation of High Voltage Transmission System for the Grand Renaissance Hydro Electric Power Plant in Ethiopiaen_US
dc.typeThesisen_US

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