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KOLENC, M., PAPIČ, I., BLAŽIČ, B.
LOCAL VOLTAGE CONTROL IN SMART GRIDS WITH TIME DEPENDENT POWER FACTOR
KOMUNALNA ENERGETIKA / POWER ENGINERING, 14
This paper deals with the influence of a lagre share of dispersed generation (DG) on a voltage profile in distribution networks. Until recently, the newly installed DG operated only with constant power factor, which was usually cos = 1. Countries around the world are now accepting the new rules and guidelines, which require that all DG participate in the voltage regulation, as they are the main reason for the voltage rise in distribution networks. Slovenia has already issued a document that prescribes different static characteristics Q(U), which determine the power factor of DG with respect to the voltage at the connection point. As the new technologies nowadays allow bidirectional data flow in almost real time, more active participation of generators in voltage regulation is possible. Concept of voltage regulation which exploits these ideas is presented. At a certain intervals desired cos can be send to all generators in the network. Advantages of such a regulation are pinpointed out. Different solutions were evaluated by means of simulation on a real medium-voltage network, which demonstrate good flexibility when using such a methods.

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