No abstract

Grid operators are more and more confronted with emerging distributed energy sources in medium voltage grids, creating active and reactive power flows which are sometimes difficult to predict or to simulate. Daily operations can suffer under these uncertainties. Laborelec has investigated the problems of congestion during the parallel coupling of multiple substations using special equipment. Measurement campaigns have been performed, in order to characterize the differences in voltage and angle between the substations, before the coupling of substations, and the exchange currents during the coupling of substations. During several days, up to 20 voltages and currents were measured synchronously at five distinct locations. The evolution during several days of the angle and voltage deviation between the different substations was shown, as well as the exchange of active and reactive power.