A Dual-Window DC Bus Interacting Method for DC Microgrids Hierarchical Control Scheme

• Published in: IEEE transactions on sustainable energy Vol. 11; no. 2; pp. 652 - 661
• Main Authors: Li, Fulong, Lin, Zhengyu, Qian, Zhongnan, Wu, Jiande, Jiang, Wei
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.04.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; Communication; Control systems; Data buses; DC bus interacting; DC microgrids; decentralized control; Distributed generation; droop control; Electric potential; Electric power distribution; Energy sources; Exchanging; Information exchange; Microgrids; Satellite broadcasting; Voltage; Voltage control; Wind turbines
• ISSN: 1949-3029; 1949-3037
• DOI: 10.1109/TSTE.2019.2900617

Hierarchical control schemes have been commonly employed in dc microgrid controls, which combine local control, dc bus voltage coordination, and communication links to guarantee smart operation of dc microgrids. Conventional dc bus voltage regulation cannot conduct signal exchange. Therefore, external communication links are usually needed for hierarchical control schemes. However, once the communication link fails, the hierarchical control system will lose its ability to coordinate the distributed power smartly. This paper proposed a dual-window dc bus interacting (DBI) method to exchange information between the distributed energy sources, for the situations where communication link fails or is not available. A small-scale dc microgrid experimental system was set up, and a simple master-slave control scheme was implemented without communication link to demonstrate the feasibility of the proposed DBI method for dc microgrid controls. The expandability and immunity of the proposed DBI method were also evaluated.