Fig. 2
From: Integrated planning of grids and energy conversion units in municipal multi-energy carrier systems
Each building or central conversion node n is modeled with three layers. Layer I represents the grid connection of node n, balancing withdrawal and infeed with the edge flows. Layer II considers the output from conversion units, which can feed their output into the grid, while layer III considers the output of all remaining units, the exogeneous energy demand and the input into all technologies in node n