Aspects of network harmonic impedance modelling in high voltage distribution networks

This paper evaluates the performance of five leading power system analysis softwares in terms of network harmonic impedance calculation for High Voltage distribution grids. Based on a set of systematic case studies the first part of the work presents a comparative analysis of the software packages in calculation of first resonance point. The different network element models and load models and their impact on the resonance parameters are discussed in detail. The second part of the research work assesses the sensitivity of the resonance parameters (impedance magnitude and frequency) depending on the change of certain network model parameters and compares the results amongst the different software packages. This gives an idea about the robustness of frequency and magnitude response at the resonance point and points out the most sensitive parameter in a HV network.