Nonlinear Controller Design to Enhance Voltage Restoration and Current Sharing Accuracy of Islanded DC Microgrids

This article proposes a feedback linearized control scheme for a single-input two-output control problem of parallel-connected dc-dc voltage source converters in islanded dc microgrids. The designed current sharing controller can be reduced the voltage deviation in the islanded dc microgrids. In this control scheme, proportional-integral and proportional-derivative controllers are applied with the design of nonlinear single-input two-output feedback linearized control law to regulate the output voltage and current of each converter. The proposed controller performance is investigated under different case studies. The proposed nonlinear control scheme improves the dc-bus voltage restoration and current-sharing accuracy in the islanded dc microgrids.