The paper describes the connection of a micro-hydropower plant to a 24 V experi- mental smart grid. The principle of the proposed design consists in improving the stability of the current grid and enabling maximum exploitation of the electric energy produced by renewable sources (hydroelectric stations, photovoltaics, wind power plants). In this respect, the authors present a very important module to the renewable sources connection and change the current flow direction. This module, denoted as Control Block, serves both to dispatch the energy to the grid and to charge the smart grid batteries. In order to secure correct operation and functioning of the Control Block, the authors applied a step-up converter and designed a special step-down converter.