Abstract
A microgrid is a localized group of electricity sources and loads that normally operates connected to the utility grid and acts as a single controllable entity. However this system has the ability of operating disconnected from the main grid, according to physical and economic conditions. Several test beds all over the world have been installed with the aim of studying new control strategies and key technologies able to increase the reliability of these systems. In the case, innovative control strategies and/or devices are made available, their behavior in the test bed needs to be studied before field tests. Therefore, a suitable dynamic model of the microgrid is required. The purpose of this paper is to develop a dynamic model of the combined heat and power system installed in the PrInCE Lab Microgrid of the Polytechnic University of Bari. More specifically, a particular focus is put on the elements connected to the DC busbar of the combined and heat power system. The model has been implemented in DIgSILENT PowerFactory environment (EMT simulations) and then validated through real measurements in both grid-connected and islanded operating conditions.
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