Modelica Library for Building and Low-Voltage Electrical AC and DC Grid Modeling

This paper presents a Modelica library for electrical grid systems for low-voltage distribution grids and inbuilding grids. The library is based on previous work, in which a library was presented to simulate fully balanced three-phase low-voltage distribution grids [1]. This library is extended to simulate three-phase unbalanced low-voltage distribution grids as part of the IDEAS library [2]. The library also allows to simulate in-building AC and DC grids. The AC grids can be single-phase or three-phase (un)balanced grids. Electrical grids may connect many different energy systems (loads and generation units), different grids and/or buildings within districts. The library allows to assess the grid impact of these systems on different grid types. Control or optimization strategies can use grid variables, such as voltages and power exchanges.