Experiences from a back-to-back converter fed village microgrid

Abstract

This paper presents the first measurement results of a back-to-back converter fed island microgrid consisting of several holiday cottages in Central Finland. The voltage stability is shown to improve considerably when the microgrid is fed by the converter. The lowest order voltage harmonics caused by nonlinear loads can be compensated. The higher order harmonics of the microgrid and the feeding grid are also at reasonably low level. Further, the capability of the converter is shown to be adequate to feed enough short circuit current to guarantee the correct operation of the fuse based protection of the microgrid.