Uporaba aktivnih elementov za zagotavljanje ustreznih napetostnih profilov in preprečevanje preobremenitev v radialnih distribucijskih omrežjih

The article deals with the issue of providing suitable voltage profiles and preventing congestion of network elements in distribution networks. Active network elements and network users’ energy flexibility services are used to provide a suitable voltage profile and prevent congestion in distribution networks. The discussed active network elements include a transformer with on-load tap changer, reactive power compensation devices, energy storage systems, distributed energy resources, and network users’ energy flexibility services, where the active consumers adjust their consumption, production and storage of energy. Based on the Backward Forward Sweep load flow computation method, the case studies are performed for the discussed low voltage distribution network, where the measurement results were available. The case studies for preventing overload of the distribution transformer are performed using a battery energy storage system and network users’ energy flexibility services. The case studies for providing suitable voltage profiles are performed using all listed active elements and a combination of different active elements. In addition, to provide suitable voltage profiles, the existing conductors are replaced with conductors of a larger cross-section. Technically acceptable solutions that can provide a suitable voltage profile and prevent the overloading of network elements in the most demanding operating conditions are presented in this article.V članku je obravnavana problematika zagotavljanja ustreznih napetostnih profilov in preprečevanje preobremenitev elementov omrežja v distribucijskih omrežjih. Za zagotavljanje ustreznega napetostnega profila in preprečevanje preobremenitev v distribucijskih omrežjih so uporabljeni aktivni elementi omrežja in storitev prožnosti energije uporabnikov omrežja. Analize so izvedene z izračunom pretokov energije z uporabo metode Backward Forward Sweep za obravnavano nizkonapetostno distribucijsko omrežje, za katero so bili podani rezultati meritev. Izvedeni so bili izračuni preprečevanja preobremenitve transformatorja z baterijskim hranilnikom energije in storitvijo prožnosti uporabnikov omrežja. Izračuni zagotavljanja ustreznega napetostnega profila so bili izvedeni z vsemi naštetimi aktivnimi elementi omrežja in s kombinacijo različnih aktivnih elementov. Zagotavljanje ustreznega napetostnega profila je bilo dodatno izvedeno z zamenjavo obstoječih vodnikov z vodniki večjega preseka. V članku so podane tehnično sprejemljive rešitve z aktivnimi elementi omrežja in s storitvijo prožnosti energije, ki preprečijo preobremenitev elementov omrežja in zagotovijo ustrezen napetostni profil