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Small and large scale solar photovoltaic energy generating systems have been observed to take a leading place in power systems around the world which are aiming to move away from the use of fossil fuels. Technical and other challenges associated with such systems have become the focus areas of discussion and investigation in recent years. Among a range of technical challenges, power quality issues associated with the power electronic converters, especially the harmonics, are an important aspect in order to ensure that their stipulated limits are maintained. While harmonics caused by small-scale inverters, for example, those used in rooftop systems, are managed through their harmonic current emission compliance requirements, the harmonics caused by large scale inverters used in solar farms need to be managed at network levels which is essentially the responsibility of the network owners and operators. To be successful in this management process, the relevant generator connection require ....
Cross harmonic generation by grid-connected high power inverters take place due to the asymmetry of inverter controllers in the presence of background harmonics in the grid. Although cross harmonic generation is often neglected in harmonic studies, the investigations reported in this paper show that the grid current magnitudes at cross harmonic frequencies can become relatively significant in some situations and hence cannot be ignored in harmonic compliance studies. This is demonstrated using example studies employing a single grid connected inverter model and a large scale three-phase solar farm model. Furthermore, an inverter harmonic model is proposed that can be used to determine the harmonic currents injected by an inverter at both the background harmonic frequency in the grid and at the cross harmonic frequency. The proposed model is validated using EMT simulation results. ....