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Enhanced Voltage Droop Control Strategy for DC Microgrid System with State Variable Feedback

Voltage Droop (VD) with inner loop Proportional-Integral (PI) control has been used in DC microgrids (DC MG) for autonomous power sharing among the interconnected loads via Power Electronic Interfaces (PEI’s). However, Voltage Droop Control (VDC) with integrated PI control poses some inherent limitations in DC MG such as undesirable DC bus voltage fluctuations, poor transient performance under sudden load changes and the inability to capture unmodeled DC MG system dynamics, such as cable line resistance effects. This paper presents a novel inner loop state variable feedback integrated VDC for DC MG to enhance system transient performance and provide stable DC bus voltage with reduced fluctuations. MATLAB/Simulink-based simulation and experimental results are provided to show the effectiveness of the proposed control technique.