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This paper deals with some particulars aspects of multiphase network harmonic modelling used in ExpertEC©, a new and simple power quality analysis tool developed by Electricite de France (EDF). It makes power quality mitigation easier and it can shorten substantially the studying time of a real power quality problem, compared with more general simulation software. This model uses true multiphase matrix models, it can deal with all the above phenomena by means of its simple and useful industrial loads and sources models. A pre-designed power quality expert unit in the software can give directly relative power quality levels compared with local utility standards. Frequency domain Norton network can be used for steady state power quality mitigation. It makes possible to simplify studied complex electric grid system to a three-phase active component. (5 pages)