On the performance of a distribution network harmonic Norton model

The subject of this paper is to give some reflections and insight to when, and for which types of networks, the method of estimating a harmonic Norton model of a distribution system might be suitable. Using a small test system, simulated in the well-known simulation program EMTDC, the influence from some system parameters on the quality of the estimated harmonic Norton models is studied. The results received indicate that the method of estimating a harmonic Norton model, based on measurements from two different system operating conditions, is most suitable for cable distribution networks with typical household and office building loads. The results also indicate that for distribution networks where shunt capacitor banks are used, the 5^th and 7 ^th harmonic network characteristics can accurately be represented with a harmonic Norton model