Establishment of load composition in aggregate harmonic load model at LV buses based on field measurements

This paper presents the methodology developed to derive the linear and nonlinear load composition of an aggregate harmonic load model based on harmonic measurements taken at the service entrance feeder. Based on harmonic current spectra of typical nonlinear loads and aggregate harmonic loads obtained through measurement at service entrance, a weighted coefficient representative of the percentage combination of each type of nonlinear load is determined by solving a set of simultaneous equations with complex variables. Subsequently, linear load fraction is determined through SUPERHARM simulation of the modeled aggregate load.