Hierarchical Control and Stability Analysis for a Nonisolated Grid-Tied DC Energy Router Integrating Energy Storage and Partial Distributed Generation

Cheng Wang, Haodong Zhang, Zhennan Zhao, Zeyuan Ding, Huanyu Xu, Lei Li, Yaosuo Xue

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This article proposes a nonisolated dc converter-based energy router (dc-ER) and its operating strategy. The intent is to integrate energy storage (ES), distributed generation (DG), local load, and dc power grid in an autonomous and more efficient way. The ES/DG power ports are coupled with each other in partial-type connections, which obtains higher voltage supply gain and direct input-output power transmission. High-voltage supply gain allows a wide solar power tracking range and the possibility of optimal battery charging/discharging. Direct input-output power transmission improves the energy conversion efficiency. In this article, the operating modes of dc-ER are first analyzed, followed by the optimal hardware design counting the DG current ripple minimization and the limitation caused by the power flow direction. Second, the mathematical model of dc-ER is deduced. The hierarchical control is then proposed to manage port energy in a flexible manner. The stability is analyzed by using impedance modeling. Finally, experimental and simulation results verify the superiorities of the proposed topology in terms of flexible operating mode transition and high-power conversion efficiency.

Original languageEnglish
Pages (from-to)1485-1502
Number of pages18
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume12
Issue number2
DOIs
StatePublished - Apr 1 2024

Funding

This work was supported by the Natural Science Foundation of Jiangsu Province under Grant BK20190461.

Keywords

  • Distributed energy resources interaction
  • energy routing strategy
  • partial dc-dc converter
  • stability analysis

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