Wybrane problemy integracji rozproszonych źródeł energii z siecią dystrybucyjną

W artykule omówiono wybrane problemy integracji rozproszonych źródeł energii z siecią elektroenergetyczną. Zdefiniowano zdolność przyłączeniową sieci oraz omówiono sposób jej wyznaczania. Przedstawiono wpływ przyłączania źródeł na parametry jakości napięcia zasilającego. Omówiono rolę zasobników energii w procesie integracji źródeł.

In the paper some selected problems of the integration of distributed energy resources in distribution power networks are presented. The influence of energy sources on the network operation is discussed. Then, network hosting capacity is defined and illustrated for different evaluation indices. The impact of energy sources connection to the network is presented with focus on power quality issues including voltage level, voltage fluctuation, voltage harmonics and asymmetry. A formula for the network hosting capacity determination is derived as regards voltage changes after the source connection. Further, the way of evaluation of voltage fluctuation and resulting flicker phenomena as well as evaluation of voltage harmonics is discussed for wind farms. Finally, the role of energy storages in the process of distributed energy sources integration is discussed with special attention to ancillary services that can be performed by storage inverters. An example of simulation is shown to illustrate the ability of energy storage to control active power and stabilize the supplying voltage at the same time.