Advanced Control Scheme for DC Microgrid via Dual Active Bridge and Bus Signaling

摘要

DC microgrid requires an effective control scheme to implement the functionalities of load sharing and voltage regulation. It is ideal to fulfill the requirement by the decentralized control scheme, which fully utilizes independently distributed power generation and load. Droop method is the common way for the system coordination, but is constrained by its performance and functionality. To better merge with the advancement of battery technology, this study features the method of DC bus signaling (DBS) to coordinate operations in microgrid, with the balance of state of charge (SoC) for each energy storage unit. Dual Active Bridge (DAB) is used as the required bidirectional power interface to maintain the charge-discharge cycle of battery units. The proposed method is examined by simulation work, demonstrating its high potential to be deployed in general DC microgrids.