Inductance-Emulating Control for DFIG-Based Wind Turbine to Ride-Through Grid Faults

Zhu, Donghai; Zou, Xudong; Lu, Dunyue; Huang, Qingjun; Zhou, Shiying; Kang, Yong

doi:10.1109/tpel.2016.2645791

Cited by 134 publications

(62 citation statements)

References 25 publications

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“…The phase-A and phase-B grid voltages are both dipped 20% using a grid fault generator [30]. Figure 23 shows the filter capacitor line-voltage and grid current.…”

Section: Unbalanced and Distorted Grid Voltage Conditionsmentioning

confidence: 99%

“…Under unbalanced grid voltage conditions, the experimental results of the grid-connected converter starting in rectifier mode with DFPS-CVFF when L ' g = 0, SCR = 10, and SCR = 2, respectively, are shown in Figure 23. The phase-A and phase-B grid voltages are both dipped 20% using a grid fault generator [30]. Figure 23 shows the filter capacitor line-voltage and grid current.…”

Section: Unbalanced and Distorted Grid Voltage Conditionsmentioning

confidence: 99%

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Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current

et al. 2017

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Three-phase active damping LCL-type grid-connected converters are usually used in distributed power generation systems. However, serious inrush current will be aroused when the grid-connected converter starts, especially in rectifier mode, if no effective control method is taken. The point of common coupling (PCC) voltage feedforward is usually used to suppress start-up inrush current. Unfortunately, it will introduce a positive feedback loop related to the grid current and grid impedance under weak grid conditions, and therefore, the grid current will be distorted and the system stability margin will be significantly reduced. To solve the above problems, this paper proposes a simple method based on a d-axis fundamental positive-sequence component of filter capacitor voltage feedforward, without extra sensors and software resources. With the proposed method, it is possible to suppress the start-up inrush current and maintain the grid current quality and system stability under weak grid conditions. The mechanism of start-up inrush current and the effectiveness of the method for inrush current suppression are analyzed in detail. Then, the influences of different feedforward methods on system stability are analyzed under weak grid conditions by the impedance model of grid-connected converter. Finally, experimental results verify the validity of the proposed method.

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“…The phase-A and phase-B grid voltages are both dipped 20% using a grid fault generator [30]. Figure 23 shows the filter capacitor line-voltage and grid current.…”

Section: Unbalanced and Distorted Grid Voltage Conditionsmentioning

confidence: 99%

Section: Unbalanced and Distorted Grid Voltage Conditionsmentioning

confidence: 99%

Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current

et al. 2017

Self Cite

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“…The fault current limiter is adopted in [14][15][16][17] to limit the fault current and enhance the LVRT ability. In [18][19][20], the control strategies of the RSC are proposed, which controls the RSC generating the rotor current for demagnetizing.…”

Section: Introductionmentioning

confidence: 99%

Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Chen¹,

Yuanhao²,

Zhu³

et al. 2019

Energies

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This paper introduces an improved rotor braking protection circuit configuration and the corresponding self-adaptive control strategy to enhance the low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG). The proposed protection circuit consists of a crowbar circuit and a series rotor braking resistor array, which guarantees the safe operation of wind generators under the LVRT. Moreover, to adapt the proposed protection and further enhance the performance of the improved configuration, a corresponding self-adaptive control strategy is presented, which regulates the rotor braking resistor and protection exiting time automatically through calculating the rotor current in the fault period. The LVRT capability and transient performance of the DFIG by using the proposed method is tested with simulation. Compared with the conventional crowbar protection or the fixed rotor braking protection, the proposed protection and the control strategy present several advantages, such as retaining the control of the rotor side converter, avoiding repeated operation of the protection and accelerating the damping of stator flux linkage during a grid fault.

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“…Nowadays, variable‐speed wind turbines have become the standard solutions for wind power plant installations, represented by double‐fed induction generator (DFIG) and permanent magnetic synchronous generator . Many practical LVRT strategies for DFIG have been discussed in Zhu and Chen et al, Xiao et al, Zhu and Zou et al, and Xie et al and proved highly effective. For permanent magnetic synchronous generator, the solution will be much easier for its own structure.…”

Section: Introductionmentioning

confidence: 99%

A dynamic strategy to improve the ride-through capability of a fixed speed induction generator

Hong

Jiang

Wang

2018

Int Trans Electr Energ Syst

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Summary Based on the analysis of the short current of the fixed speed induction generator (FSIG) under symmetrical system faults, a strategy using the dynamic voltage restorer (DVR) is proposed to improve the low‐voltage ride through (LVRT) capability of FSIGs. During the system fault, LVRT‐DVR is connected in series between the grid and the generator by switching‐off the by‐pass bidirectional thyristors and provides a compensating voltage to isolate FSIG from the system fault. To increase the switch‐in speed of LVRT‐DVR, an antivoltage technique is used to shut the thyristors off immediately. After the fault is cleared, the phase‐shifting control is applied to avoid phase jumps of the FSIG terminal voltage. The PSCAD/EMTDC simulation and field tests have been carried out to prove the effectiveness of the proposed LVRT strategy, and related conclusions and comments are summarized.

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Inductance-Emulating Control for DFIG-Based Wind Turbine to Ride-Through Grid Faults

Cited by 134 publications

References 25 publications

Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current

Improved Capacitor Voltage Feedforward for Three-Phase LCL-Type Grid-Connected Converter to Suppress Start-Up Inrush Current

Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

A dynamic strategy to improve the ride-through capability of a fixed speed induction generator

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