Harmonic voltages and currents on two Greek islands with photovoltaic stations: study and field measurements

The purpose of this paper is to investigate the harmonic distortion present on the electric grid of two small Greek islands (Arki and Antikythera) where photovoltaic stations are installed, to study their inverters´ harmonic behaviour, and to present the measurements of the harmonic voltages and currents obtained at field tests on these two islands. It is shown that the harmonics injected by the photovoltaic stations to the electric grid are not very high and at most cases they cannot cause significant problems to the appliances of the customers. On the other hand, a theoretical analysis of the installed inverter technology is also presented, showing that the results from the measurements and those of the presented analysis are quite identical. From both measurements and theoretical analysis conclusions concerning the problem of harmonics are drawn