Stability enhancement of DC power systems by VSM control strategy

Yaqian Yang, Jiazhu Xu*, Chang Li, Tomislav Dragicevic, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

DC system is characterized by low inertia and weak damping, which leads to a couple of stability issues. This paper proposes a modeling method for analyzing the DC-side oscillations occurred in DC microgrid with taking multi-paralleled converters into account. A new modeling is developed for analysis of dynamic interaction between multiple power converters. Thus, it is found that dynamic interaction between multiple converters will result in the poorly-damped oscillation of DC voltage. Besides, the poorly-damped modes will aggravate the stability of DC system. To cope with this issue, a virtual synchronous machine (VSM) control approach is proposed to suppress the oscillation of DC voltage, strengthen inertia, and improve damping performance of DC microgrid. Besides, the controller tuning of the VSM has a large flexibility that it does not depend on the system parameters. Finally, the proposed conceives are demonstrated by simulations.

Original languageEnglish
Article number106569
JournalInternational Journal of Electrical Power and Energy Systems
Volume126
Number of pages8
ISSN0142-0615
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Bidirectional grid- connected converter (BGC)
  • DC network
  • DC voltage
  • DC-side oscillations
  • Virtual synchronous machine control (VSM)

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