Identification of the transmission capacity of regional 110 kV distribution grids with wind energy utilisation

Large scale wind energy utilisation in a region changes the power balance a nd the loads of the electrical equipment of 110 kV level of the grid. The c alculation of those effects is required for the evaluation of remaining tra nsportation capacity as well as for grid reinforcement. The use of probabil istic power flow calculation allows the incorporation of the frequency of o peration conditions into the calculus which is excluded in the standard met hod on power flow calculation. An example demonstrates the use of this appr oach in a case where the wires of overhead 110 kV transmission have been th e limiting component. In general this approach enables grid-planning and op eration to identify reserves regarding transmission capacities as well as b etter evaluations of investments in grid reinforcement.