The Effect of Network Modelling on Harmonic Propagation Studies in Power Electronics Rich Transmission Networks

Abstract

This paper investigates the effect of transmission lines/cables and transformers modelling on harmonic propagation studies in power electronics rich transmission networks. It compares the available models of lines and transformers, and formulates nine case studies by pairing different models. Probabilistic harmonic propagation studies are then carried out considering different harmonic injection by renewable energy sources (wind and PV plants) under different operating conditions. Total harmonic distortion (THD) at critical buses in the network is calculated and the effect of different models of lines and transformers used on recorded 95 percentile of THD at critical buses is assessed. The analysis is carried out on the modified IEEE 68 bus test network.