Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 11, Pages 7598-7610Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2518749
Keywords
Bidirectional; electric vehicle (EV); frequency dividing coordinated control; hybrid energy storage system (HESS); quasi-Z-source inverter (qZSI)
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Funding
- National Nature Science Foundation of China [51407159, 51490682]
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An ultracapacitor-battery hybrid energy storage system (HESS) for an electric vehicle (EV) based on a bidirectional quasi-Z-source inverter (qZSI) is proposed in this paper. The buck/boost characteristic in the qZSI enables the HESS incorporated into the traction inverter system. The battery converter can be eliminated and the rated voltages for the battery package and UCs are reduced. The steady power distribution principle is explained under various operation modes. An enhanced frequency dividing coordinated control strategy is established to optimize the dynamic power regulation and the battery current stress in short timescale. Both the simulation and experimental results in time and frequency domain validate the performance of the proposed HESS.
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