Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Stability Analysis of FCHEV Energy System Using Frequency Decoupling Control Method

  • Dai, Peng (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Sun, Weinan (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Xie, Houqing (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Lv, Yan (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Han, Zhonghui (School of Electrical and Power Engineering, China University of Mining and Technology)
  • Received : 2016.09.01
  • Accepted : 2016.12.30
  • Published : 2017.03.20
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Abstract

Fuel cell (FC) is a promising power supply in electric vehicles (EV); however, it has poor dynamic performance and short service life. To address these shortcomings, a super capacitor (SC) is adopted as an auxiliary power supply. In this study, the frequency decoupling control method is used in electric vehicle energy system. High-frequency and low-frequency demand power is provided by SC and FC, respectively, which makes full use of two power supplies. Simultaneously, the energy system still has rapidity and reliability. The distributed power system (DPS) of EV requires DC-DC converters to achieve the desired voltage. The stability of cascaded converters must be assessed. Impedance-based methods are effective in the stability analysis of DPS. In this study, closed-loop impedances of interleaved half-bridge DC-DC converter and phase-shifted full-bridge DC-DC converter based on the frequency decoupling control method are derived. The closed-loop impedance of an inverter for permanent magnet synchronous motor based on space vector modulation control method is also derived. An improved Middlebrook criterion is used to assess and adjust the stability of the energy system. A theoretical analysis and simulation test are provided to demonstrate the feasibility of the energy management system and the control method.

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References

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