Full-scale test and modelling of the frequency control dynamics of the Nordic power system

The grid frequency quality in the Nordic power system has been deteriorating during the last decade. To improve the situation, a better understanding of the system is needed. In this paper, a model of the Nordic power system dynamics with respect to normal operation frequency control is set up and compared with full-scale measurements on the system. The “60 s oscillation” of the grid frequency is measured and explained by the system model.