Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Voltage Distortion Suppression for Off-grid Inverters with an Improved Load Current Feedforward Control

  • Geng, Yiwen (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Zhang, Xue (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Li, Xiaoqiang (School of Electrical and Electronic Engineering, Nanyang Technological University) ;
  • Wang, Kai (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Yuan, Xibo (Department of Electrical and Electronic Engineering, University of Bristol)
  • Received : 2016.04.21
  • Accepted : 2017.02.13
  • Published : 2017.05.20
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Abstract

The output voltage of an off-grid inverter is influenced by load current, and the voltage harmonics especially the 5th and 7th are increased with nonlinear loads. In this paper, to attenuate the output voltage harmonics of off-grid inverters with nonlinear loads nearby, a load current feedforward is proposed. It is introduced to a voltage control loop based on the Positive and Negative Sequence Harmonic Regulator (PNSHR) compensation to modify the output impedance at selective frequencies. The parameters of the PNSHR are revised with the output impedance of the off-grid inverter, which minimizes the output impedance of the off-grid inverter. Experimental results verify the proposed method, showing that the output voltage harmonics caused by nonlinear loads can be effectively suppressed.

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References

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