Including Load Impedance Uncertainty in Harmonic Impedance Seen from a Low-voltage Customer

This paper presents the impact of load impedance uncertainty on harmonic source and transfer impedance and consequently on harmonic propagation in distribution networks. A generic MV/LV model of the network and a more detailed model of an existing network are used. Both models include MV network and remote LV customers. Utilizing a Monte Carlo simulation method, it is shown that variation in load impedance has a big impact on the main resonant frequency of the local network but only limited influence on resonant frequency caused by remote loads connected to other LV networks.