Harmonic Interaction Between a Large Number of Distributed Power Inverters and the Distribution Network

TLDR

Power quality issues from distributed inverters are mainly observed in high‑penetration rooftop photovoltaic projects. This study investigates harmonic interference from large populations of distributed inverters and compares how different inverter topologies and control options interact with the network. The authors employ extensive laboratory experiments and computer modeling, including a full network simulation of a residential grid with high PV penetration, to analyze inverter interactions.

Abstract

Power quality problems associated with distributed power (DP) inverters, implemented in large numbers onto the same distribution network, are investigated. Currently, these power quality problems are mainly found in projects with large penetration of photovoltaics (PV) on rooftops of houses and commercial buildings. The main object of this paper is to analyze the observed phenomena of harmonic interference of large populations of these inverters and to compare the network interaction of different inverter topologies and control options. These power quality phenomenons are investigated by using extensive laboratory experiments, as well as computer modeling of different inverter topologies. A complete network simulation study on an existing residential network with large penetration of PVs, is included.