This project is focused on the architecture design of micro-markets to deal with the massive integration of distributed energy resources in distribution networks without grid upgrades. Moreover, this master thesis developed a simulation tool to analyse the performance of phase 1 of micro-market including the comparison between with and without the participation of a community battery unit. Additionally, the project includes the methodology to create the offer or bid to participate in the wholesale day-ahead market in aggregated mode. Finally, the project analyses the optimal area to determine the competition between two generators with the same cost but in different buses.