Browsing by Author "Samuel, Biru"

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    Power Flow Analysis of Sebeta to Adama Railway Electrification power Line with Thyristor Controlled Series Compensator (TCSC)
    (Addis Ababa University, 2014-08) Samuel, Biru; Kiros, Tesfaye (Mr.)
    The Ethiopian Railway Corporation (ERC) is working hard to have modern railway system that uses the AC power supply system. Voltage drop in the feeding circuit differs substantially depending up on the train position, train current, number of train in the same power feeding section, track impendence etc. The minimum pantograph voltage for the train expected is to be 20kV, which is within the tolerable voltage fluctuation range of the overhead contact line. On the other hand, power transfer problems have occurred frequently within large variation of loads. These issues are important in traction power supply system to ensure normal operation of the electric locomotives. Considering these two problems this thesis work propose integration of Thyristor Control Series Compensator transmission system for improving traction network voltage and enhancing power transfer capability for double-track Sebeta-to-Adama section of Ethiopian Railway line. The necessary data and Electrical parameters are collected from the double-track Sebeta-to-Adama section of Ethiopian Railway line. Modeling and simulation of traction system have been performed using MATHLAB/SIMULINK. The plots after simulation of networks both with and without Thyristor control series capacitor has helped to analyze the power flow and traction voltage level. The overall power transfer capacity of the catenary line of the system is increased. This thesis work shows that the real power is enhanced from 11.9MW to 14.33MW (measured at the load side), which is 16.34% enhancement by using TCSC controlling of catenary line. Integration of TCSC has also advantages of improving the substation power factor, In this thesis it is shown that the power factor is improved from 0.94 to 0.99, at the same time it can be used as the load voltage improving device, As shown from result part of this thesis the load voltages of train one and train two are improved from 21.69kV to 25kV and 21.61kV to 25kV respectively. Based on these results it is recommended that Ethiopian Railway Corporation to consider integrating TCSC device for Sebeta to Adama railway line.