Island DC Microgrid Hierarchical Coordinated Multi-Mode Control Strategy

Zhongbin Zhao, Jing Zhang, Yu He and Ying Zhang
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Zhongbin Zhao: School of Electrical Engineering, Guizhou University, Guiyang 550025, China
Jing Zhang: School of Electrical Engineering, Guizhou University, Guiyang 550025, China
Yu He: School of Electrical Engineering, Guizhou University, Guiyang 550025, China
Ying Zhang: Guizhou Power Grid Company, Guiyang 550001, China

Energies, 2019, vol. 12, issue 15, 1-20

Abstract: As renewable energy sources connecting to power systems continue to improve and new-type loads, such as electric vehicles, grow rapidly, direct current (DC) microgrids are attracting great attention in distribution networks. In order to satisfy the voltage stability requirements of island DC microgrids, the problem of inaccurate load power dispatch caused by line resistance must be solved and the defects of centralized communication and control must be overcome. A hierarchical, coordinated, multiple-mode control strategy based on the switch of different operation modes is proposed in this paper and a three-layer control structure is designed for the control strategy. Based on conventional droop control, a current-sharing layer and a multi-mode switching layer are used to ensure the stable operation of the DC microgrid. Accurate load power dispatch is satisfied using a difference discrete consensus algorithm. Furthermore, virtual bus voltage information is applied to guarantee smooth switching between various modes, which safeguards voltage stability. Simulation verification is carried out for the proposed control strategy by power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC). The results indicate that the proposed control strategy guarantees the voltage stability of island DC microgrids and accurate load power dispatch under different operation modes.

Keywords: direct current (DC) microgrid; multi-mode smooth switch; droop control; difference discrete consensus algorithm; hierarchical coordinated control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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