Design of a special protection scheme and supplementary controls regarding HVDC back to back interconnection between Turkey and Georgia

Tanıdır, Özgür
HVDC Back-to-Back interconnection between Turkey and Georgia is operational since November 2013. Previous feasibility analysis regarding to this project has shown that depending on the amount of power transfer between parties and loading conditions, there might be transmission bottlenecks and problems observed in Turkish Power System. In this respect, special protection coordination is required to maintain reliable and sustainable operation. In this thesis, design of a special protection scheme that coordinates outages in the region along with some countermeasures is introduced. The design study starts with analyzing critical scenarios and instabilities endangering the normal operation of Turkish Power System in order to define requirements of the special protection scheme. In this regard, static and dynamic analyses are carried out to identify instability patterns and solution spaces for critical instability conditions. The results have shown that regional system is highly vulnerable to the contingencies and may face regional collapse even without interconnection. Hence, several scenarios and several loading conditions have been analyzed in detail in order to give insight to special protection logic design and calculate countermeasures required for critical instability conditions. As a result of these studies, requirements for stable and sustainable operation of the region are specifically determined and a wide area measurement based special protection scheme is designed. In addition, modelling of the designed scheme in a power system simulation environment and simulation results of the proposed scheme are presented. Finally, coordination and compliance between existing protection measures with the proposed protection scheme are also investigated.


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Citation Formats
Ö. Tanıdır, “Design of a special protection scheme and supplementary controls regarding HVDC back to back interconnection between Turkey and Georgia,” M.S. - Master of Science, Middle East Technical University, 2014.