Cascaded Voltage Control for Electric Springs with DC-Link Film Capacitors

Ming Hao Wang, Yufei He, Tianbo Yang, Youwei Jia, Zhao Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


For the conventional configuration of the single-phase electric springs, the electrolytic capacitor (E-cap) is required for buffering the double-line-frequency dc-link power. This demands large capacitance and constant average dc-link voltage for achieving sufficiently low-voltage ripples of the E-cap, which renders low efficiency and poor reliability of the ES. To address these issues, a cascaded voltage control scheme is proposed in this article. The proposed control scheme enables large fluctuations of the dc-link voltage so that the film capacitor (F-cap), which is of smaller capacitance and higher reliability, can be applied. In addition, the proposed control scheme can adaptively adjust the average dc-link voltage for achieving the minimum power loss of the ES. The quasi-steady-state and steady-state models of the electric-spring-based smart load are developed. The optimum average dc-link voltage for achieving the minimum power loss is analytically derived. The functionality and loss reduction capability of the proposed controller are verified through hardware experiments and simulations.

Original languageEnglish
Article number8943323
Pages (from-to)3982-3994
Number of pages13
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number4
Publication statusPublished - Dec 2020


  • AC microgrid
  • electric springs (ESs)
  • reactive power control
  • voltage control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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