Integrated Communication and Control of PV-Based DC Microgrid

Abstract

The emergence of the renewable energy sources such as the PV, fuel cells and storage systems, in addition to the consumer electronic have shifted the view to DC Microgrids. The inherent PV DC sources provides 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 transfer their information through a kind of network. In this paper we present a networked system approach for PV based DC Microgrid. A quasi-decentralized control strategy is implemented in the controller. The PV sources controllers communicate through communication network to achieve current sharing. The exact delay margin for the stability is calculated using the sweeping test and the binary iteration algorithm. The controller achieves good performance even with the fluctuations in the PV sources. The impact of the DC Microgrid parameters and the controller parameters on the delay margin is investigated.