Modularized Control Strategy and Performance Analysis of DFIG System Under Unbalanced and Harmonic Grid Voltage

Song, Yipeng; Nian, Heng

doi:10.1109/tpel.2014.2366494

Cited by 63 publications

(42 citation statements)

References 19 publications

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“…Thus, impedance modeling needs to take the influence of transformer configuration. Equation (9), moreover, (10) can be rewritten as (11) and (12) by supposing the turn ratios of the primary and secondary side are K r = V PCC /V 1 and K g = V PCC /V 2 , respectively.…”

Section: Impedance Modelingmentioning

confidence: 99%

Active damping of resonances in DFIG system with cascade converter under weak grid

Din

Zhang

et al. 2019

Int Trans Electr Energ Syst

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Summary The interaction of impedance between the doubly fed induction generator (DFIG) system and series‐compensated weak grid gives rise to an issue of subsynchronous resonance (SSR). Likewise, the high‐frequency resonance (HFR) occurs when a DFIG system is connected to parallel‐compensated weak grid. This paper proposes an improved method to mitigate the caused resonance. The improved method, based on impedance modeling, utilizes an additional cascaded converter (CC) at Y‐point of DFIG stator winding with virtual impedance implemented at the CC control unit, which reshapes the DFIG impedance for effective mitigation of both SSR and HFR. The virtual impedance is disabled when DFIG operated in series‐compensated weak grid, while enabled when working in parallel‐compensated weak grid, which effectively damps the HFR. A detailed theoretical explanation and impedance modeling of the CC has been given. The effectiveness of the proposed method has been validated through MATLAB simulations based on a 2‐MW DFIG system.

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Section: Impedance Modelingmentioning

confidence: 99%

Active damping of resonances in DFIG system with cascade converter under weak grid

Din

Zhang

et al. 2019

Int Trans Electr Energ Syst

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“…12. Bode diagram of the DFIG system impedance and the series π sections weak network ZNET (a) two sections ZNET2; (b) three sections ZNET3, with CNET = 1.024 μF, RNET = 2.06 Ω, LNET = 36 mH in (5). Virtual impedance in (10) with ωc = 2000 rad/s, ωbp = 2π*1600 rad/s, Rv = 4e-9 Ω, Td = 300 μs Fig.…”

Section: Implementation Of Virtual Impedance In the Stator Branchmentioning

confidence: 99%

Analysis and Active Damping of Multiple High Frequency Resonances in DFIG System

Song¹,

Blaabjerg²,

Wang³

2017

IEEE Trans. Energy Convers.

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As the wind power generation develops, the Doubly Fed Induction Generator (DFIG) based wind power system are more and more likely to operate in the emerging weak network rather than the conventional stiff network. Due to the comparatively large impedance of the weak network than the stiff grid, the DFIG system may be subject to the resonances due to the impedance interaction between the DFIG system and the weak network. Especially, when connected to a series π sections weak network, the Multiple High Frequency Resonances (MHFR) may occur and require careful studies. The impedance modeling of the DFIG system and the series π sections weak network is firstly demonstrated in this paper. Then, due to the multiple magnitude peaks of the series π sections of the weak network, the MHFR will be produced and can be theoretically explained based on the impedance modeling results. For the purpose of mitigating the MHFR, an active damping strategy which introduces a virtual impedance, including a phase leading compensation unit and a virtual positive resistance, is proposed and demonstrated. Simulations are conducted to validate the DFIG system MHFR as well as the proposed active damping strategy.Index Terms -DFIG system; series π sections weak network; multiple high frequency resonances; virtual impedance; active damping.The authors are with the

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“…Other methods need stator voltage decomposition into positive and negative sequence, in order to deal with them separately to meet the specific control targets . Some of the proposed approaches are based on oversimplifications, where assumptions were made that during voltage imbalance, unbalanced voltage vector pulsation has constant value, which is not true because it contains double grid frequency component.…”

Section: Introductionmentioning

confidence: 99%

“…Other methods need stator voltage decomposition into positive and negative sequence, in order to deal with them separately to meet the specific control targets. [7][8][9] Some of the proposed approaches are based on oversimplifications, 10 where assumptions were made that during voltage imbalance, unbalanced voltage vector pulsation has constant value, which is not true because it contains double grid frequency component. In Iwanski et al, 11 the virtual torque-based control method of three-phase rectifier has been proposed, whereas the grid has been treated as the virtual machine similarly to the well-known virtual flux oriented control method.…”

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confidence: 99%

Direct torque control of a doubly fed induction generator working with unbalanced power grid

Pura

Iwański

2019

Int Trans Electr Energ Syst

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Summary The paper describes direct torque control of a doubly fed induction generator (DFIG) executed in the stator stationary reference frame. A full model of DFIG is presented, and relations for the rotor voltages are derived. The case with symmetrical and asymmetrical grid voltage operation is presented along with the corresponding simulation and experimental results. As a control target, the minimization of the torque oscillations at sinusoidal stator current is chosen. No decomposition into positive and negative voltage sequence for presented algorithm is necessary. The proportional‐resonance (PR) regulator tuned for fundamental harmonic of grid voltage frequency is applied. As the torque value is independent of the reference frame, the variables are not synchronized neither with the grid voltage nor with the stator flux vector. The control method is presented, and its performance for balanced and unbalanced voltage is given. To obtain the required target, the auxiliary scalar variable calculated as a dot product of stator flux and stator current is used.

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Modularized Control Strategy and Performance Analysis of DFIG System Under Unbalanced and Harmonic Grid Voltage

Cited by 63 publications

References 19 publications

Active damping of resonances in DFIG system with cascade converter under weak grid

Active damping of resonances in DFIG system with cascade converter under weak grid

Analysis and Active Damping of Multiple High Frequency Resonances in DFIG System

Direct torque control of a doubly fed induction generator working with unbalanced power grid

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