Classification of reserve capacity in future power systems

In electrical power systems must always be a balance between supply and demand. Any imbalance will result in a frequency deviation. To reduce the imbalance to zero, ancillary services for balancing are in use. Ancillary services are characterised by their deployment time and their capacity. By using Discrete Fourier Transform, the kind of ancillary services as well as the requirements for balance management can be characterised in the frequency domain. Agents, that are responsible for maintaining balance in a network, can use the characterisation in the frequency domain to define their needs for reserve capacity. This paper describes a method for spectral analysis of the required reserve capacity. Based on examples and a model, changes in a future power system are discussed using the frequency domain.