Vyvedení výkonu z kogenerační jednotky do distribuční soustavy

Abstract

This thesis deals with the connection of new cogeneration units to an electric power distribution system. It consists of a theoretical and practical part of the calculation. The theoretical part is summarizes issues with cogeneration units and short circuit phenomena. The practical part contains a calculation of short circuit phenomena when two new synchronous generators are added, and a power cables design with regard to the thermal effects of short circuit current. Two possibilities are proposed, one with a minimum safety reserve (short circuit current duration) and the other with a sufficient reserve. Current limiting is also designed for the second variant of the cables, which protects the supply against possible short circuits.