Voltage quality in the low voltage distribution grids with the high penetration of distributed energy sources

This paper describes the impact of the operation of distributed energy sources on voltage quality parameters in low voltage distribution grids. The survey is based on the evaluation of 60 voltage quality measurements which were carried out in 30 different low voltage distribution grids with connected power sources. These 60 measurements were made in 2014 and were evaluated according to the standard EN 50160. The impact on voltage variations and other voltage quality parameters was analysed.