Small Signal Stability Analysis of the Angle Difference Control on a HVDC Interconnection Embedded in the CE Synchronous Power System

Interarea oscillations are a well-known phenomenon in large scale power systems such as continental Europe (CE). The evolution of the modes with the extension of the synchronous area has been assessed over time. This paper focuses on the impact of the AC line emulation control for high voltage direct current projects on the damping of main CE oscillatory modes. Analytical and simulation results show that, depending on the system operational point and location of the converter stations, a low value of the filter time constant may reduce the mode damping. Further efforts in developing a suitable platform for data and dynamic models exchange are required in order to monitor and improve our knowledge of the oscillatory condition of the CE system, and agree on effective real-time actions.