The Hybrid Bidirectional DC/DC Converter: Mutual Control and Stability Analysis

Haiyang Liu; Shumei Cui; Hanwen Zhang; Yiwen Hu; Yuhongyang Xue; Chuang Liu

doi:10.17775/CSEEJPES.2021.00260

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The Hybrid Bidirectional DC/DC Converter: Mutual Control and Stability Analysis

Regular Papers | 更新时间：2026-10-15

- The Hybrid Bidirectional DC/DC Converter: Mutual Control and Stability Analysis
- CSEE Journal of Power and Energy Systems Vol. 9, Issue 2, Pages: 769-778(2023)
- 作者机构：
  
  1. School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin,China
  2. Aalborg University, Aalborg,Denmark
  3. School of Electrical Engineering, Northeast Electric Power University,Jilin,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2021.00260
  CLC：
- Published：01 March 2023
- 稿件说明：
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Haiyang Liu, Shumei Cui, Hanwen Zhang, et al. The Hybrid Bidirectional DC/DC Converter: Mutual Control and Stability Analysis[J]. CSEE Journal of Power and Energy Systems, 2023, 9(2): 769-778.
DOI：

Haiyang Liu, Shumei Cui, Hanwen Zhang, et al. The Hybrid Bidirectional DC/DC Converter: Mutual Control and Stability Analysis[J]. CSEE Journal of Power and Energy Systems, 2023, 9(2): 769-778. DOI： 10.17775/CSEEJPES.2021.00260.

摘要

Abstract

A hybrid bidirectional DC/DC converter (BDC) is proposed as the fundamental DC/DC module in solid-state transformers

which combines a bidirectional LLC converter and a dual-active-bridge (DAB) converter. Integrated with a mutual control scheme

both parts of this hybrid BDC can be unified into an interdependent community. In this hybrid BDC

the LLC converter supports the output voltage and improves stability by working at the resonant frequency mode and the DAB converter enhances the BDC power capability by controlling the LLC output current constant. The BDC can achieve the full-load-range soft switching of all active switches by designing the auxiliary inductor of LLC and the minimum output current of DAB. By comparing to the single DAB

the proposed BDC has the higher phase and gain margin which means the BDC improved the relative stability based on Nyquist criterion. To solve the bidirectional power control problem

a dead-band voltage control logic is adopted which can determine the BDC's power direction based on the output voltage change. A 200 V experimental system has verified the aforementioned features and functions of the BDC.

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