On-ground observations of solar over-irradiance effects and their influence on the low-voltage electric power grid

Abstract The strong solar radiation variability during the Solar cycle 25 has revealed the vulnerability and fragility of Earth’s biosphere to external high-energy fluxes. The solar spectral irradiance constantly changes at all wavelengths and over different periods of time. The negative impact on the Earth and human society at solar maxima can be observed as solar over-irradiance in the UV-A, UV-B, VIS, IR over-heating, magnetic storms, atmospheric lightning, etc. In such extraordinary weather conditions, the big photovoltaic (PV) power plants are delivering a new kind of instability to the power grid. In this work, selective wavelength measurements of the solar irradiance are performed in order to distinguish and predict power disturbances. Correlations between solar events and low voltage (LV) power grid fluctuations are investigated.