The Impact of a Power Plant on the Inter Area Oscillations

We can observe in all electrical systems in the world, cc. 0.2,...,0.3 Hz oscillations in state variables in steady state operation. The amplitude of these - so called inter-area oscillations - is growing going away from the centre of a large electrical power system. In the UCTE (European) system in the centre (near the German - French border) the amplitude of oscillations in frequency deviation time function is less then 2 mHz and near the borders, cc. 6 mHz, in steady state operation. In the first part of this paper we show the impact of a power plant on inter area oscillations by model investigation. In the second part our conclusions are reinforced by field tests performed on existing power plants.