Frequency-dependent Modeling of Generic Honeycomb Networks

Abstract

Harmonic and resonance analyses demand an appropriate frequency-dependent network model with specific network characteristics. Often these characteristics are not reflected in benchmark network models or a lack of data does not allow a precise network modeling. In this report, a methodology how to set up a simplified generic network model with desired characteristics based on the honeycomb approach is enhanced by frequency-dependent modeling. This includes new modeling approaches for external and downstream networks. Further, the harmonic background distortion is mapped including the zero and negative sequence to consider asymmetries in the network model for detailed harmonic studies. The methodology is demonstrated on an exemplary real transmission grid. The homogeneous network set-up leads to homogeneous busbar impedances and harmonic voltages, so that the impact of changes to the grid can be quantified easily. Consequently, it can be utilized for a large scope of applications such as harmonic studies on the impact of the rising use of underground cables in the transmission grid, or the increasing number of harmonic feed-ins due to the integration of renewable energy sources.