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Harmonic interaction between a large number of distributed power inverters and the distribution network

Power quality problems associated with distributed power inverters, implemented in high numbers in the same distribution network, are investigated. These power quality problems are currently mainly found in projects with large penetration of photovoltaics on roof-tops of houses and commercial buildings. The main object of this paper is to analyse the observed phenomena of harmonic interference of large populations of these inverters and compare the network interaction of different inverter topologies and control options. These power quality phenomenon are investigated using extensive laboratory experiments on inverter topologies, as well as computer modelling of different inverter topologies. A complete network simulation study on a real residential network with large penetration of PV is included.