Internal Model-based Voltage Control for DC Microgrids Under Unknown External Disturbances

The applicability of a two-degree of freedom (DOF) internal model-based voltage control (IMVC) scheme for DC Microgrids (DCMGs) with unknown external disturbances is explored in this paper. One of the most challenging aspects of voltage control in DC/DC converters is maintaining voltage reference tracking under unknown external disturbances and measurement noise while the load changes simultaneously. This paper develops a voltage control framework to address these challenges by a plug-and-play internal model voltage controller for voltage-source converters (VSCs) at the primary level. The effectiveness of the proposed control scheme is evaluated by a MATLAB/Simulink testbed, considering unknown external disturbances under various rapid voltage reference changes and load profile changes in multiple case study scenarios.