Working principle analysis and control algorithm for bidirectional DC/DC converter

  • B.Y. Li Dalian Polytechnic University
  • C. Xu Dalian Polytechnic University
  • C. Li The University of New South Wales
  • Z. Guan Dalian Polytechnic University


A bidirectional DC/DC converter is an important part of the DC micro grid system, playing a key role in the stable operationof the system and the coordinated distribution of power. To solve the problem of unstable busbar voltage when the energytransforms bidirectionally in the DC micro grid system, a control algorithm based on closed-loop proportion integral derivativewas proposed in this study. The hardware cinarcuit of the bidirectiol DC/DC converter was designed in the DC micro gridenergy storage system, and the characteristics of converter efficiency in charging mode and constant voltage output werestudied by small-signal modeling of the bidirectional DC/DC converter in charging and discharging systems. Experimentaldata were used to prove the correctness of the theoretical analysis. The results demonstrate that the current-controlledprecision changes steadily in the charging mode when the output voltage is constant and the charging current is adjustablein ranges between 1 A and 2 A. When the charging current is 2 A and the output voltage ranges from 24 V to 36 V, thechange rate of the charging current undergoes stable changes. In the discharge mode, when the output voltage is stable,the converter conversion rate changes steadily. When the output voltage changes in the range between 32 V and 38 V, thebidirectional DC/DC circuit automatically switches over the work patterns and maintains the stability of the output voltage.This study achieves bidirectional transmission of energy by rational hardware design of a bidirectional DC/DC converter andimproves the reliability of the DC micro grid energy storage system. The proposed method provides a good prospect ofa control scheme for the bidirectional DC/DC converter to optimize practical engineering design.


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How to Cite
LI, B.Y. et al. Working principle analysis and control algorithm for bidirectional DC/DC converter. Journal of Power Technologies, [S.l.], v. 97, n. 4, p. 327–335, jan. 2018. ISSN 2083-4195. Available at: <>. Date accessed: 23 july 2024.
Energy Engineering and Technology

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