Photovoltaic distributed generation units (PV-DGU): impacts on power quality, international power quality standards and power quality improvement methods for the systems with PV-DGU

In today's power systems, the use of distributed generation units has become widespread in order to improve the voltage profile, increase system reliability, reduce line losses and increase energy efficiency. Among these distributed generation units, wind turbines and photovoltaic units have limited the use of traditional energy sources such as natural gas, coal and oil in electricity generation, thus they became important options for the prevention of environmental problems such as greenhouse gas emissions and global warming. However, these distributed generation units are connected to the grid via power electronics circuits and their energy sources are non-dispatchable. Thus, they lead to various power quality problems in the power systems. In this study, firstly, the latest technological case of the photovoltaic distributed generation units (PVDGUs) is presented. Secondly, the power quality problems caused by PV-DGUs in the power systems and the international power quality standards related with the systems containing PV-DGUs are investigated. Finally, the power quality mitigation methods have been detailed for the systems with PV-DGUs.

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