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An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions

Author

Listed:
  • Zhen Xie

    (School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

  • Lifan Niu

    (School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

  • Xing Zhang

    (School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)

Abstract

Harmonic amplification for doubly-fed induction generator wind turbine systems (DFIG WTSs) will occur due to the existence of non-linear loads and reactive power compensation installation, and grid voltage and total grid current at the point of common coupling (PCC) will be distorted. An impedance model is established to analyze the interaction between DFIG WTS, non-linear loads and weak grids. Harmonic current impact factor and harmonic voltage impact factor is proposed to analyze the impact of harmonic current source on total grid current and voltage at the PCC with different control strategies. A virtual harmonic resistor and capacitor method is adopted to reduce the harmonic voltage. An impedance-based analysis method is adopted to analyze the stability of the DFIG system. To achieve optimal control of harmonic voltage and harmonic current, a coordination factor is proposed to adjust the dynamic allocation for harmonic voltage and harmonic current at PCC. The experimental results demonstrate the effectiveness of the proposed control strategy.

Suggested Citation

  • Zhen Xie & Lifan Niu & Xing Zhang, 2018. "An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions," Energies, MDPI, vol. 11(10), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2613-:d:173126
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    References listed on IDEAS

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    1. Jiawei Li & Jun Yao & Xin Zeng & Ruikuo Liu & Depeng Xu & Caisheng Wang, 2017. "Coordinated Control Strategy for a Hybrid Wind Farm with DFIG and PMSG under Symmetrical Grid Faults," Energies, MDPI, vol. 10(5), pages 1-21, May.
    2. Zhong Zheng & Geng Yang & Hua Geng, 2013. "Coordinated Control of a Doubly-Fed Induction Generator-Based Wind Farm and a Static Synchronous Compensator for Low Voltage Ride-through Grid Code Compliance during Asymmetrical Grid Faults," Energies, MDPI, vol. 6(9), pages 1-22, September.
    3. Jun Yao & Qing Li & Zhe Chen & Aolin Liu, 2013. "Coordinated Control of a DFIG-Based Wind-Power Generation System with SGSC under Distorted Grid Voltage Conditions," Energies, MDPI, vol. 6(5), pages 1-21, May.
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