Low Frequency Current Ripple Mitigation of Two Stage Three-Phase PEMFC Generation Systems

  • Deng, Huiwen (School of Electrical Engineering, Southwest Jiaotong University) ;
  • Li, Qi (School of Electrical Engineering, Southwest Jiaotong University) ;
  • Liu, Zhixiang (School of Electrical Engineering, Southwest Jiaotong University) ;
  • Li, Lun (School of Electrical Engineering, Southwest Jiaotong University) ;
  • Chen, Weirong (School of Electrical Engineering, Southwest Jiaotong University)
  • Received : 2016.03.07
  • Accepted : 2016.07.27
  • Published : 2016.11.20


This paper presents a two stage three-phase proton exchange membrane fuel cell (PEMFC) generation system. When the system is connected to a three-phase load, it is very sensitive to the characteristics and type of the load. Especially unbalanced three-phase loads, which result in a pulsating power that is twice the output frequency at the inverter output, and cause the dc-link to generate low frequency ripples. This penetrates to the fuel cell side through the front-end dc-dc converter, which makes the fuel cell work in an unsafe condition and degrades its lifespan. In this paper, the generation and propagation mechanism of low frequency ripple is analyzed and its impact on fuel cells is presented based on the PEMFC output characteristics model. Then a novel method to evaluate low frequency current ripple control capability is investigated. Moreover, a control scheme with bandpass filter inserted into the current feed-forward path, and ripple duty ratio compensation based on current mode control with notch filter is also proposed to achieve low frequency ripple suppression and dynamic characteristics improvement during load transients. Finally, different control methods are verified and compared by simulation and experimental results.


Supported by : National Natural Science Foundation of China, Sichuan Provincial Youth Science and Technology Fund


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