Proportional current sharing based on periodic dynamic event-driven H∞ consensus in DC microgrids with power coupling

• Main Authors: Wang, Rui, Sun, Qiuye, Liu, Lei, Zhang, Li, Wang, Peng, Zhang, Huaguang
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Engineering::Electrical and electronic engineering; Current Sharing; Event-Driven Communication
• Online Access: https://hdl.handle.net/10356/165109
• Institution: Nanyang Technological University

Although the proportional current sharing has been widely studied, the heterogeneous characteristic of the different interfaced converters and power coupling terms among distributed generators (DGs) are rarely considered. Therefore, this paper proposes a secondary H∞ consensus method with a periodic dynamic event-driven scheme for dc microgrids with power coupling to accomplish the precise proportional current-sharing. It is useful for reducing carbon. First, a generalized converter is constructed through equivalent transformation between rectifier and boost converter. Moreover, the heterogeneous characteristic of the interfaced converters regarding different DGs, such as wind and solar generators, is embedded into controller design. Furthermore, the standard linear heterogeneous multi-agent system with power coupling term is built. On this basis, the problem of proportional current sharing is modified into the output consistency problem of multi-agent systems. Furthermore, the H∞ consensus approach is proposed to accomplish the precise proportional current sharing. Meanwhile, to shorten communication bandwidth, the periodic dynamic event-driven communication strategy is designed. Compared with traditional event-driven communication schemes, a lower communication frequency has been obtained through the proposed communication scheme. In addition, this communication scheme not only avoids Zeno-behavior, but also acquires the smallest sampling time interval. Finally, effectiveness of the proposed approach is verified by two test systems.