Harmonic coupled norton equivalent model for modeling harmonic-producing loads

This paper verifies the importance of load modeling for the harmonic assessment of power systems. Three different models are discussed, and the impact of each approach on the harmonic evaluation of power networks is highlighted. Through this discussion, a Harmonic Coupled Norton Equivalent (HCNE) model is pointed out as a suitable approach to represent the behavior of harmonic producing loads. A methodology for obtaining the parameters of the HCNE model using measurements is presented in this paper. Two different simulations are carried out using a simple power network, in order to assess the impact of the load modeling. One simulation considers the typical current source model, in order to represent the harmonic producing load, whereas the other one considers the HCNE model. The results show considerable differences on the harmonic indices, indicating that the load modeling may considerably affect the harmonic assessment of power networks.