Abstract
This paper examines the results of the penetration of mixed distributed generation technologies in a medium-voltage power distribution network. Specifically, the connected distributed generation resources are mainly photovoltaic units, a wind farm, and a hydroelectric plant; these all operate with different power factors. Their influence on the network currents, losses, voltage profile, and the short-circuit level at the medium-voltage busbars of the infeeding substation are examined for differed load conditions according to international and national standards. The problems that arise are explored through parametric investigations concerning the operating characteristics of the connected units. Furthermore, the optimum allocation of the same or different types of distributed generation resources to the examined network is determined in order to obtain the maximum penetration without technical problems. Finally, general conclusions regarding the handling of the relevant practical problems are given.
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