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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

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
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Energies 2018, 11(10), 2613; https://doi.org/10.3390/en11102613
Received: 31 July 2018 / Revised: 28 August 2018 / Accepted: 21 September 2018 / Published: 1 October 2018
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. View Full-Text
Keywords: doubly-fed induction generator (DFIG); impedance model; virtual harmonic resistor and capacitor; impact factor doubly-fed induction generator (DFIG); impedance model; virtual harmonic resistor and capacitor; impact factor
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Xie, Z.; Niu, L.; Zhang, X. An Enhanced Control Strategy for Doubly-Fed Induction Generators Based on a Virtual Harmonic Resistor and Capacitor under Nonlinear Load Conditions. Energies 2018, 11, 2613.

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