Abstract
Harmonic voltage measurements have been carried out in MV- and LV-systems having different load mixture. The results are presented separately for systems supplying industrial, commercial and residential load as well as for systems with photovoltaic generation. The harmonic voltages mainly of the low order harmonics in some of the MV- and LV-systems are extremely high, reaching almost the compatibility levels. Harmonics of higher order are considerably lower. The influence of photovoltaic generation is seen in an increase of harmonic voltages for all harmonics, whereas even for high order harmonics the voltage level is high. In industrial systems the harmonic voltage levels cover a wide range, even and odd order harmonics are present to a significant extend. The increase of system load in a LV-system indicated doubling of the harmonic voltage levels while the system load increased ten times. The results can be transferred to other systems having similar load mixture and short-circuit characteristic and can also be used to verify limits for the connection of additional electronic load and generation. (4 pages)
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