  Low-frequency disturbances of power quality are one of the most common
disturbances in the power grid. These disturbances are most often the result of
the impact of power electronic and energy-saving devices, the number of which
is increasing significantly in the power grid. Due to the simultaneous
operation of various types of loads in the power grid, various types of
simultaneous disturbances of power quality occur, such as voltage fluctuations
and distortions. Therefore, there is a need to analyze this type of
simultaneous interaction. For this purpose, a special and complementary
laboratory setup has been prepared, which allows for the examination of actual
states occurring in modern power networks. Selected research results are
presented for this laboratory setup, which determine its basic properties.
Possible applications and possibilities of the laboratory setup are presented
from the point of view of current challenges.
