Integration of Non-synchronous Generation. Frequency Dynamics

Traditionally the predominant generation has been large synchronous generators providing the system inertia. Nowadays when wind power and other non-synchronously connected units displaces this synchronous generation, the system inertia is reduced. Hence higher rate of change of frequency and larger frequency deviations are expected. This thesis deals with the impact on rate of change of frequency and frequency deviation in the Nordic power system with decreasing system inertia as well as with the introduction of synthetic inertia and frequency support from wind turbines. Increasing wind power is a question of system inertia, governor frequency response, load frequency response and magnitude of disturbance rather than the amount of wind power in the system. As long as the system inertia is maintained at an acceptable level, the wind power production can be arbitrarily selected