The study of the impact of renewable energy sources generation on voltage losses in the distribution grid lines using the wavelet coherence

Abstract

This paper proposes the use of wavelet coherence to conduct a study on the
impact of renewable energy sources’ generation on voltage losses in lines. The case study
of the low-voltage distribution grid equipped with seven photovoltaic panels and one wind
turbine was examined to demonstrate the functionality of the proposed methodology. Based
on the simulation studies, the concept of how time-varying generation from the wind
turbine or photovoltaic panels can affect the voltage losses in the selected power lines over
one month was discussed. The analysis results were visualized using wavelet coherence
delay plots. In contrast to other related studies, this research also includes additional plots
like scale-averaged coherence, scale-averaged phase shift, time-averaged phase shift, and
time-averaged coherence. The conducted studies extend and enrich the current view on
the impact of renewable energy sources’ generation on the power grid. The use of wavelet
coherence can also help highlight additional information that may be ignored or overlooked,
especially in fast-paced systems. This kind of research may be useful for supplementing
the results of load flow calculations with additional information on the voltage losses for
distribution grid operators. It can be considered a general tool for conducting a more in-depth
analysis of the influence of renewable energy sources on the power grid.