Modeling and Analysis of Transient Interactions in AC/DC Interconnected Microgrid

摘要

This paper investigates control methodologies based on first principle model of an integrated AC/DC microgrid utilizing the dq-framework. The model shows high non-linearity and captures the dynamic interaction between the AC and DC subsystems of the microgrid for different types of controllers and disturbances. Simulation results show that the AC and DC subsystems are tightly dynamically coupled so that any disturbance in one subsystem induces transients in the other. It is shown that separate controllers in AC and DC subsystems can easily suppress disturbances originating in any subsystem of the grid. PSCAD simulation was used to further validate the results. The proposed method can be extended in modeling islanded or grid-connected microgrid with multiple generators and various types of DC and AC loads and disturbances.