Decentralized Dual Loop Control for Secure Energy Management in DC Microgrid

Abstract

In this paper, a decentralized dual-loop control scheme for power electronics converters in DC microgrid is presented. This scheme provides control over voltage and current in a decoupled manner for maintaining the voltage while limiting the current for safety. The microgrid generation and load bus are connected through an interlinking boost converter (IBC) which works with a dual PI controller based technique. The Grid-connected voltage source converter (GVSC) maintains the voltage and power balance during grid-connected mode using a dual PI controller based technique. The coordination of the IBC and GVSC provides the microgrid for fast and stable operation with secure energy management in both grid-connected and islanded modes. The DC microgrid is tested in MATLAB/SIMULINK.