Research on a Multi-Objective Control Strategy for Current-source PWM Rectifiers under Unbalanced and Harmonic Grid Voltage Conditions

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, 5th and 7th 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 2nd order fluctuations, and 3) elimination of the DC-current 2nd and 6th 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, 5th and 7th order harmonic current. Finally, experimental results verify the effectiveness of proposed control strategy.

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Cite this article

[IEEE Style]

Y. Geng, H. Liu, R. Deng, F. Tian, H. Bai, K. Wang, "Research on a Multi-Objective Control Strategy for Current-source PWM Rectifiers under Unbalanced and Harmonic Grid Voltage Conditions," Journal of Power Electronics, vol. 18, no. 1, pp. 171-184, 2018. DOI: 10.6113/JPE.2018.18.1.171.

[ACM Style]

Yi-Wen Geng, Hai-Wei Liu, Ren-Xiong Deng, Fang-Fang Tian, Hao-Feng Bai, and Kai Wang. 2018. Research on a Multi-Objective Control Strategy for Current-source PWM Rectifiers under Unbalanced and Harmonic Grid Voltage Conditions. Journal of Power Electronics, 18, 1, (2018), 171-184. DOI: 10.6113/JPE.2018.18.1.171.