Active damping control based on virtual resistance for stand‑alone DC microgrid

Authors

Xin TANG, State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, China
Shuai WANG, State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, ChinaFollow
Zhen LI, State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, China
Xin HUANG, State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, China

Keywords

DC microgrid; constant power load; oscillation; stability analysis; active damping

Abstract

Due to the presence of a large number of constant power loads (CPLs) in a stand‑alone DC microgrid, the damping of the DC microgrid is reduced, leading to oscillations and even significant drops in the DC bus voltage. To address this issue, an active damping method is proposed to improve system stability. The damping of the converter is increased to suppress the resonant peak by connecting a virtual resistance in parallel at the port of the energy storage converter without adding extra sensors. The method for designing the active damping parameters is provided, and the effect of the proposed parallel virtual resistance method on system stability is analyzed using the frequency stability criterion. The performance of this method is also compared with that of the conventional damping method. Experimental results verify that the parallel virtual resistance method can effectively improve the stability of a stand‑alone DC microgrid system in a wide frequency band.

DOI

10.19781/j.issn.1673-9140.2025.03.021

First Page

192

Last Page

199,210

Recommended Citation

TANG, Xin; WANG, Shuai; LI, Zhen; and HUANG, Xin (2025) "Active damping control based on virtual resistance for stand‑alone DC microgrid," Journal of Electric Power Science and Technology: Vol. 40: Iss. 3, Article 21.
DOI: 10.19781/j.issn.1673-9140.2025.03.021
Available at: https://jepst.researchcommons.org/journal/vol40/iss3/21