A model of large load areas for harmonic studies in distribution networks

llhis paper describes an lIllproved model of rotating loads m complex load areas. The first section of the paper concentrates on the theoretical aspects of load modeling in harmonic penetration studies with a particular reference to the rotatbg part of load. The second section illustrates the results achieved firom the expenmental surveys conducted both m the laboratory and at a ma30r industrial customer, m order to validate the model proposed in the field. The third section describes the cahbration stage of the proposed model based on results h m a statistical survey conducted at manufacturers on parameter variation VS bequency with a large sample of both LV and MV induction motors. Finally, SOme guidelines are also provlded for a correct use of the proposed model m system studies concemmg harmoruc penetration within electric distribution networks.