Application of a stochastic aggregate load model to study harmonic propagation in distribution networks

This paper has applied a method for aggregating downstream networks while retaining their stochastic properties, for use in harmonic propagation studies in distribution networks. The method has been applied to two Swedish medium-voltage networks where the connected low-voltage networks, including customer loads, are represented by stochastic aggregated harmonic load models. The results show that the studied medium-voltage networks exhibit a relatively low resonance frequency for their first resonance point. In the frequency range around the first resonance, the uncertainty in the impedance was found to be high, whereas for higher frequencies the uncertainty in the impedance characteristic was much smaller.