Dynamic Response Improvements of Parallel-Connected Bidirectional DC–DC Converters

  • Deshang Sha
  • Guo Xu
Part of the CPSS Power Electronics Series book series (CPSS)


Parallel-connected modular current-fed bidirectional DC–DC converters are used for the AC motor drive system powered by batteries with low voltage and wide voltage range. The input current ripple can be reduced significantly by employing interleaving technology not only for individual module but also for all the modules. A current-sharing control strategy is applied for the constituent modules. Double pulse width modulation plus double phase shifted control with equal duty cycles for one module can minimize the circulation loss and avoid non-active power issue. Factors affecting dynamic performance are investigated based on the small-signal modeling. The leakage inductance value is optimized in view of system reliability and better dynamic performance. Besides, to improve the dynamic performance further, feed-forward control employing optimized feed-forward coefficient based on the small-signal analysis is implemented. A 4 kW prototype composed of two bidirectional DC–DC converters is built to verify the effectiveness for the proposed control strategy in AC motor drive application with fast regenerative braking.


Parallel-connected DC–DC converter Current-sharing Dynamic performance Feed-forward control Motor drive 


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Advanced Power Conversion Center, School of AutomationBeijing Institute of TechnologyBeijingChina

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