Emission from small scale PV-installations on the low voltage grid

Abstract

The use of solar panels is becoming more popular in Sweden. Parts of Scandinavia have many sun hours and the cold temperatures are advantageous as they lead to higher efficiencies and longer lifetimes of the solar cells. In this paper conducted emission levels associated with the connection of photovoltaic systems will be discussed. Harmonics (up to 2 kHz) and supraharmonics (2 to 150 kHz) will be discussed. Measurements from three phase connected plants (20 kW) and from smaller (up to 2.5 kW) single phase connected plants are shown. The harmonic emission from PV-plants is reasonably low and somewhat constant with regards to the production. Some residue from the switching of the inverter can be found typical at a few kHz.