Short-circuit calculation in distribution networks with high renewable sources portion

U ovom radu cilj mi je bio obraditi problem proračuna struja kratkog spoja. Za početak sam ukratko objasnio simetrične komponente jer to smatram nužnim za razumijevanje ostatka rada. Nakon toga prešao sam na teoriju kratkog spoja, što je, čemu služi, koje su vrste, te koje sve struje su nam potrebne za dimenzioniranje zaštitnih i drugih uređaja. Kako bih se mogao pozabaviti samim proračunom struja kratkog spoja morao sam objasniti i normu IEC 60909. Ukratko sam objasnio pojmove distribucije i obnovljivih izvora energije jer je rad fokusiran na tom području. Prije kratkog primjera naveo sam i objasnio sve nadomjesne impedancije. Za kraj sam na primjeru jedne mreže matematički i pomoću programskog alata NEPLAN izvršio potpuni proračun struja kratkog spoja.Main goal in this paper was to explain the problem of short circuit current calculation. I started my paper with explanation of symmetrical components which I think is necessary to understand the rest of this paper. After that I began with theory of short circuit, what is that, what is it used for, what types are there and what currents we need protective and other devices sizing. To begin with calculation I had to explain very important norm which is norm IEC 60909. In few sentences I described electric power distribution and renewable energy sources. After all that theoretical explanations I did mathematical calculation of short circuit current. At the end of this paper I did calculation in program NEPLAN, same electrical network as used in example earlier