Load modelling for analysis of power-system harmonics under unbalanced conditions

This paper analyses the load-harmonic modelling under balanced conditions. It presents a harmonic characterization of linear three-phase loads (three- phase P-Q consumptions) for different impedance configurations and analytic al models for an ideal six- and twelve-pulse converter supplied by unbalanc ed voltages, too. The models of these linear and non-linear loads are incor porated to the three-phase harmonic load-flow formulation. A 15-bus network is presented to study the different load behaviour.