Integrated communication and control of PV-based DC microgrid [articol]

Abstract

The emergence of the renewable energy sources such as the PV, fuel cells and storage systems have shifted the view to DC Microgrid. The inherent PV DC sources provide the compatibility with the DC loads without the need for multiple DC/AC and DC/AC conversions. In the DC Microgrid, the energy sources, storage units and loads are connected to a DC Bus through DC/DC converters. In order to achieve the control tasks and for energy management, the sources should exchange their information through a kind of network. The PV sources controllers communicate through communication network to achieve current sharing. The induced time delay could destabilize the system and it is important to determine the maximum delay margin. The exact delay margin for the stability is computed using the sweeping test and the binary iteration algorithm. The controller achieves good performance even with the fluctuations in the output of the PV sources. The impact of the DC Microgrid parameters and the controller parameters on the delay margin is investigated.