Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Research on a Multi-Objective Control Strategy for Current-source PWM Rectifiers under Unbalanced and Harmonic Grid Voltage Conditions

  • Geng, Yi-Wen (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Liu, Hai-Wei (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Deng, Ren-Xiong (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Tian, Fang-Fang (School of Electrical and Power Engineering, China University of Mining and Technology) ;
  • Bai, Hao-Feng (Department of Energy Technology, Aalborg University) ;
  • Wang, Kai (School of Electrical and Power Engineering, China University of Mining and Technology)
  • Received : 2017.04.26
  • Accepted : 2017.09.24
  • Published : 2018.01.20
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Abstract

Unbalanced and distorted grid voltages cause the grid side current of a current source PWM rectifier to be heavily distorted. They can also cause the DC-link current to fluctuate with a huge amplitude. In order to enhance the performance of a current-source PWM rectifier under unbalanced and harmonic grid voltage conditions, a mathematical model of a current-source PWM rectifier is established and a flexible multi-objective control strategy is proposed to control the DC-link current and grid-current. The fundamental positive/negative sequence, $5^{th}$ and $7^{th}$ order harmonic components of the grid voltage are first separated with the proposed control strategy. The grid current reference are optimized based on three objectives: 1) sinusoidal and symmetrical grid current, 2) sinusoidal grid current and elimination of the DC-current $2^{nd}$ order fluctuations, and 3) elimination of the DC-current $2^{nd}$ and $6^{th}$ order fluctuations. To avoid separation of the grid current components, a multi-frequency proportional-resonant controller is applied to control the fundamental positive/negative sequence, $5^{th}$ and $7^{th}$ order harmonic current. Finally, experimental results verify the effectiveness of proposed control strategy.

Keywords

References

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